阅读说明：本技术 一种用于gnss接收机的信号放大电路及其接收机 (Signal amplification circuit for GNSS receiver and receiver thereof ) 是由 朱青永 于 2021-07-26 设计创作，主要内容包括：本发明公开了一种用于GNSS接收机的信号放大电路及其接收机,包括第一级增益可调放大电路和第二级增益可调放大电路,所述第一级增益可调放大电路和第二级增益可调放大电路相连接构成将GNSS卫星信号按预设增益进行放大的信号放大通路。本发明设置有两级增益可调的放大电路进行叠加以扩大信号放大的增益区间并实现信号放大增益可控,同时依据两级增益可调的放大电路构成的接收机中,分别对GNSS卫星信号中的GPS卫星信号、BDS卫星信号、GLONASS卫星信号和Galileo卫星信号进行单独接收且按预设增益放大至相同幅度,保障各类卫星信号的幅度规整度,以直观的分析或计算出频域规律,提高信号数据在定位计算中的利用率以最终提高定位精度。(The invention discloses a signal amplification circuit for a GNSS receiver and the GNSS receiver, and the signal amplification circuit comprises a first-stage gain adjustable amplification circuit and a second-stage gain adjustable amplification circuit, wherein the first-stage gain adjustable amplification circuit and the second-stage gain adjustable amplification circuit are connected to form a signal amplification channel for amplifying GNSS satellite signals according to preset gain. The invention is provided with two-stage gain adjustable amplifying circuits for superposition to enlarge the gain interval of signal amplification and realize controllable signal amplification gain, and simultaneously, in a receiver formed by the two-stage gain adjustable amplifying circuits, GPS satellite signals, BDS satellite signals, GLONASS satellite signals and Galileo satellite signals in GNSS satellite signals are separately received and amplified to the same amplitude according to preset gain, so that the amplitude regularity of various satellite signals is ensured, the frequency domain regularity is intuitively analyzed or calculated, and the utilization rate of signal data in positioning calculation is improved to finally improve the positioning precision.)

1. A signal amplification circuit for a GNSS receiver, characterized by: the GNSS satellite signal amplification device comprises a first-stage gain adjustable amplification circuit and a second-stage gain adjustable amplification circuit, wherein the first-stage gain adjustable amplification circuit and the second-stage gain adjustable amplification circuit are connected to form a signal amplification channel for amplifying a GNSS satellite signal according to preset gain, the first-stage gain adjustable amplification circuit is used for performing adjustable amplification of first-stage gain on the GNSS satellite signal in a first gain interval, and the second-stage gain adjustable amplification circuit is used for performing adjustable amplification of second-stage gain on the GNSS satellite signal which is subjected to adjustable amplification of first-stage gain through the first-stage gain adjustable amplification circuit in a second gain interval so as to achieve the amplification effect of preset gain by performing overlapped amplification of the first-stage adjustable amplification and the second-stage adjustable amplification on the GNSS satellite signal.

2. The signal amplification circuit for a GNSS receiver of claim 1, wherein: the first-stage gain adjustable amplifying circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth adjustable resistor R4, a fifth resistor R5, a first capacitor C1, a first diode D1, a second diode D2, a first power supply V1, a second power supply V2 and a first amplifier U1, wherein,

one end of the first resistor R1 is electrically connected to the 3 rd pin of the first amplifier U1, one end of the third resistor R3, one end of the second resistor R2 and one end of the first capacitor C1 are electrically connected to the 2 nd pin of the first amplifier U1, one end of the fifth resistor R5, one end of the first diode D1 and the positive end of the second power source V2 are electrically connected to the 7 th pin of the first amplifier U1, two ends of the non-adjustable end of the fourth adjustable resistor R4 are electrically connected to the 1 st pin and the 8 th pin of the first amplifier U1, the adjustable end of the fourth adjustable resistor R4 is electrically connected to the other end of the fifth resistor R5, the other end of the first capacitor C1, the other end of the second resistor R2, the other end of the first diode D1 and one end of the second diode D2 are electrically connected to the first pin 366 of the first amplifier U1, the other end of the second diode D2 and the negative terminal of the first power source V1 are electrically connected to the 4 th pin of the first amplifier U1, and the other end of the first resistor R1, the other end of the second power source V2, the other end of the third resistor R3, and the other end of the first power source V1 are grounded, respectively.

3. The signal amplification circuit for a GNSS receiver of claim 2, wherein: the second-stage gain-adjustable amplifying circuit comprises a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a second capacitor C2, a third diode D3, a fourth diode D4 and a second amplifier U2, wherein,

a pin 6 of the first amplifier U1 is electrically connected to a pin 3 of the second amplifier U2, one end of the seventh resistor R7, one end of the sixth resistor R6 and one end of the second capacitor C2 are respectively electrically connected to a pin 2 of the second amplifier U2, one end of the ninth resistor R9, one end of the third diode D3 and the positive end of the second power source V2 are respectively electrically connected to a pin 7 of the second amplifier U2, two ends of the non-adjusting end of the eighth adjustable resistor R8 are respectively electrically connected to a pin 1 and a pin 8 of the second amplifier U2, the adjusting end of the eighth adjustable resistor R8 is electrically connected to the other end of the ninth resistor R9, the other end of the second capacitor C2, the other end of the sixth resistor R6, the other end of the third diode D3 and one end of the fourth diode D4 are electrically connected to a pin 3 of the second amplifier U2, the other end of the fourth diode D4 is electrically connected to the negative terminal of the first power source V1 and the 4 th pin of the second amplifier U2, and the other end of the seventh resistor R3 is grounded.

4. A signal amplification circuit for a GNSS receiver according to claim 3, characterized in that: the first gain interval is determined by the regulation interval of the regulation end of the fourth regulation resistor R4 and the regulation end dwell position is characterized as a first-stage gain, the second gain interval is determined by the regulation interval of the regulation end of the eighth regulation resistor R8 and the regulation end dwell position is characterized as a second-stage gain.

5. A receiver for a signal amplification circuit of a GNSS receiver according to any of claims 1-4, characterized in that: comprises a multi-system signal amplification module (1), a multi-system correlator module (2) and a multi-system gain determination module (3), wherein,

the multi-system correlator module (2) is used for respectively and singly receiving a GPS satellite signal, a BDS satellite signal, a GLONASS satellite signal and a Galileo satellite signal of a GNSS satellite signal;

the multi-system gain determining module (3) is used for determining preset gains of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal by utilizing the original amplitudes of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal according to the principle of signal same amplitude;

the multi-system signal amplification module (1) is used for carrying out adjustable amplification on the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal according to preset gains of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal so as to keep the amplification amplitudes of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal uniform, regular and controllable.

6. A receiver as claimed in claim 5, characterized in that: the multi-system correlator module (2) comprises a GPS satellite system correlator channel set, a BDS satellite system correlator channel set, a GLONASS satellite system correlator channel set and a Galileo satellite system correlator channel set, wherein the GPS satellite system correlator channel set comprises correlator channels for independently receiving a plurality of GPS satellite signals, the BDS satellite system correlator channel set comprises correlator channels for independently receiving a plurality of BDS satellite signals, the GLONASS satellite system correlator channel set comprises correlator channels for independently receiving a plurality of GLONASS satellite signals, and the Galileo satellite system correlator channel set comprises correlator channels for independently receiving a plurality of Galileo satellite signals.

7. A receiver as claimed in claim 6, characterized in that: the multi-system gain determining module (3) comprises a GPS satellite signal collecting component, a BDS satellite signal collecting component, a GLONASS satellite signal collecting component and a Galileo satellite signal collecting component which are respectively arranged at the signal output ends of the GPS satellite system correlator channel group, the BDS satellite system correlator channel group, the GLONASS satellite system correlator channel group and the Galileo satellite system correlator channel group so as to respectively collect the original amplitudes of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal, and a data processing unit which is in communication connection with the data output ends of the GPS satellite signal collecting component, the BDS satellite signal collecting component, the GLONASS satellite signal collecting component and the Galileo satellite signal collecting component, wherein the data processing unit receives the original amplitudes of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal and respectively determines the original amplitudes of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal according to the original amplitudes, The BDS satellite signals, the GLONASS satellite signals and the Galileo satellite signals realize the integral multiple of the least common multiple of the amplification to the preset gain with the same amplitude.

8. The receiver according to claim 7, wherein the multi-system signal amplifying module (1) comprises a plurality of signal amplifying circuits integrated therein, and gain adjusting units respectively for adjusting the plurality of signal amplifying circuits to preset gains, the gain adjusting units respectively being configured to correspondingly adjust and set the plurality of signal amplifying circuits to the preset gains of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal, and to amplify the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal to the same amplitude in the order of the least common multiple of the integer multiple of the preset gains.

9. The receiver of claim 8, wherein the plurality of signal amplification circuits are in one-to-one communication connection with the GPS satellite system correlator channel set, the BDS satellite system correlator channel set, the GLONASS satellite system correlator channel set, and the Galileo satellite system correlator channel set, respectively.

10. The receiver of claim 9, wherein the predetermined gain interval comprises a product of a number of a first gain interval of a first stage gain adjustable amplifier circuit and a second gain interval of a second stage gain adjustable amplifier circuit in the signal amplifier circuit, and the predetermined gain is a product of a number of the first stage gain and the second stage gain.

Technical Field

The invention relates to the technical field of satellite positioning, in particular to a signal amplification circuit for a GNSS receiver and the GNSS receiver.

Background

Global Navigation Satellite Systems (GNSS) generally refer to systems that allow a position fix (positionfix) to be determined based on GNSS signals received from a plurality of GNSS satellites. Each GNSS satellite transmits a GNSS signal that identifies the satellite and the time of signal transmission. The GNSS antenna/receiver is configured to receive each of the GNSS signals transmitted by the visible GNSS satellites and to determine a pseudorange or range from the GNSS antenna/receiver to the respective GNSS satellite using a time of flight of each GNSS signal and a known position of each GNSS satellite. The plurality of calculated pseudoranges are used to trilaterate a position of the GNSS antenna/receiver in three dimensional space. Types of GNSS systems include Global Positioning System (GPS), GLONASS (GLONASS), Galileo (Galileo), Beidou (BDS), and the like.

In the prior art, CN201921328941.2 discloses an amplifying circuit for a GNSS receiver and a GNSS receiver, the amplifying circuit includes: the first band-pass filter, the first amplifier, the high-pass filter, the second band-pass filter and the second amplifier are connected in sequence; the first band-pass filter is used for filtering out signals outside a navigation frequency range in wireless signals received by a satellite antenna of the GNSS receiver; the first amplifier is used for amplifying the output signal of the first band-pass filter; the high-pass filter is used for filtering 4G low-frequency band signals in the output signals of the first amplifier; the second band-pass filter is used for filtering signals out of the navigation frequency band in the output signals of the high-pass filter; the second amplifier is used for amplifying and outputting the output signal of the second band-pass filter, so that the interference of the 4G low-frequency band signal on the GNSS receiver is reduced, and the measurement accuracy of the GNSS receiver is improved.

The above prior art can reduce the interference of the 4G low-frequency band signal to the GNSS receiver, improve the measurement accuracy of the GNSS receiver, and still have certain defects, such as: the GNSS receiver only performs gain amplification with the same times for the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal contained in the GNSS satellite signal, the gain is not adjustable, the amplification limitation is large, and the gain amplification with the same times is set for the four satellite signals, so that the signal amplitudes of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal after amplification keep respective original rules.

Disclosure of Invention

It is an object of the present invention to provide a signal amplification circuit for a GNSS receiver and a receiver thereof, so as to solve the problems that the GNSS receiver in the prior art only performs gain amplification with the same times as the GNSS satellite signals, including the GPS satellite signals, the BDS satellite signals, the GLONASS satellite signals and the Galileo satellite signals, the gain is not adjustable, the amplification limitation is large, and the same times of gain amplification is set for the four satellite signals, so that the signal amplitudes of the amplified GPS satellite signal, BDS satellite signal, GLONASS satellite signal and Galileo satellite signal keep respective original rules, the difference of the four satellite system signal structures inevitably causes the difference of the system despreading code technology, so that the amplitudes of the four satellite signals after being spread and decoded are uneven, the consistency of the amplitudes is difficult to maintain during positioning calculation, the signal data utilization rate is low, the intuitiveness is poor, and the subsequent positioning accuracy is finally influenced.

In order to solve the technical problems, the invention specifically provides the following technical scheme:

a signal amplification circuit for a GNSS receiver comprises a first-stage gain-adjustable amplification circuit and a second-stage gain-adjustable amplification circuit, wherein the first-stage gain-adjustable amplification circuit and the second-stage gain-adjustable amplification circuit are connected to form a signal amplification path for amplifying GNSS satellite signals according to preset gains, the first-stage gain-adjustable amplification circuit is used for performing first-stage gain-adjustable amplification on the GNSS satellite signals in a first gain interval, and the second-stage gain-adjustable amplification circuit is used for performing second-stage gain-adjustable amplification on the GNSS satellite signals, which are subjected to the first-stage gain-adjustable amplification by the first-stage gain-adjustable amplification circuit, in a second gain interval so as to achieve the amplification effect of the preset gains by performing first-stage gain-adjustable amplification and second-stage gain-adjustable amplification on the GNSS satellite signals.

As a preferable aspect of the present invention, the first-stage gain-adjustable amplifying circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth adjustable resistor R4, a fifth resistor R5, a first capacitor C1, a first diode D1, a second diode D2, a first power source V1, a second power source V2, and a first amplifier U1, wherein,

one end of the first resistor R1 is electrically connected to the 3 rd pin of the first amplifier U1, one end of the third resistor R3, one end of the second resistor R2 and one end of the first capacitor C1 are electrically connected to the 2 nd pin of the first amplifier U1, one end of the fifth resistor R5, one end of the first diode D1 and the positive end of the second power source V2 are electrically connected to the 7 th pin of the first amplifier U1, two ends of the non-adjustable end of the fourth adjustable resistor R4 are electrically connected to the 1 st pin and the 8 th pin of the first amplifier U1, the adjustable end of the fourth adjustable resistor R4 is electrically connected to the other end of the fifth resistor R5, the other end of the first capacitor C1, the other end of the second resistor R2, the other end of the first diode D1 and one end of the second diode D2 are electrically connected to the first pin 366 of the first amplifier U1, the other end of the second diode D2 and the negative terminal of the first power source V1 are electrically connected to the 4 th pin of the first amplifier U1, and the other end of the first resistor R1, the other end of the second power source V2, the other end of the third resistor R3, and the other end of the first power source V1 are grounded, respectively.

As a preferable aspect of the present invention, the second-stage gain-adjustable amplifying circuit includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a second capacitor C2, a third diode D3, a fourth diode D4, and a second amplifier U2, wherein,

a pin 6 of the first amplifier U1 is electrically connected to a pin 3 of the second amplifier U2, one end of the seventh resistor R7, one end of the sixth resistor R6 and one end of the second capacitor C2 are respectively electrically connected to a pin 2 of the second amplifier U2, one end of the ninth resistor R9, one end of the third diode D3 and the positive end of the second power source V2 are respectively electrically connected to a pin 7 of the second amplifier U2, two ends of the non-adjusting end of the eighth adjustable resistor R8 are respectively electrically connected to a pin 1 and a pin 8 of the second amplifier U2, the adjusting end of the eighth adjustable resistor R8 is electrically connected to the other end of the ninth resistor R9, the other end of the second capacitor C2, the other end of the sixth resistor R6, the other end of the third diode D3 and one end of the fourth diode D4 are electrically connected to a pin 3 of the second amplifier U2, the other end of the fourth diode D4 is electrically connected to the negative terminal of the first power source V1 and the 4 th pin of the second amplifier U2, and the other end of the seventh resistor R3 is grounded.

In a preferred embodiment of the present invention, the first gain interval is determined by a regulation interval of the regulation end of the fourth regulation resistor R4 and the regulation end staying position is characterized as a first-stage gain, the second gain interval is determined by a regulation interval of the regulation end of the eighth regulation resistor R8 and the regulation end staying position is characterized as a second-stage gain.

As a preferred aspect of the present invention, the present invention provides a receiver according to the signal amplification circuit for a GNSS receiver, comprising the multi-system signal amplification module, the multi-system correlator module, and the multi-system gain determination module, wherein,

the multi-system correlator module is used for respectively and singly receiving a GPS satellite signal, a BDS satellite signal, a GLONASS satellite signal and a Galileo satellite signal of a GNSS satellite signal;

the multi-system gain determining module is used for determining preset gains of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal by utilizing original amplitudes of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal according to a signal same amplitude principle;

the multi-system signal amplification module is used for carrying out adjustable amplification on the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal according to preset gains of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal so as to keep the amplification amplitudes of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal uniform, regular and controllable.

As a preferred embodiment of the present invention, the multi-system correlator module includes a GPS satellite system correlator channel set, a BDS satellite system correlator channel set, a GLONASS satellite system correlator channel set, and a Galileo satellite system correlator channel set, the GPS satellite system correlator channel set includes correlator channels for separately receiving a plurality of GPS satellite signals, the BDS satellite system correlator channel set includes correlator channels for separately receiving a plurality of BDS satellite signals, the GLONASS satellite system correlator channel set includes correlator channels for separately receiving a plurality of GLONASS satellite signals, and the Galileo satellite system correlator channel set includes correlator channels for separately receiving a plurality of Galileo satellite signals.

As a preferred embodiment of the present invention, the multi-system gain determining module includes a GPS satellite signal collecting module, a BDS satellite signal collecting module, a GLONASS satellite signal collecting module and a Galileo satellite signal collecting module respectively disposed at signal output ends of the GPS satellite system correlator channel group, the BDS satellite system correlator channel group, the GLONASS satellite system correlator channel group and the Galileo satellite system correlator channel group to respectively collect original amplitudes of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal, and a data processing unit communicatively connected to data output ends of the GPS satellite signal collecting module, the BDS satellite signal collecting module, the GLONASS satellite signal collecting module and the Galileo satellite signal collecting module, the data processing unit receives the original amplitudes of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal and respectively determines to determine the original amplitudes of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal according to the original amplitudes, The BDS satellite signals, the GLONASS satellite signals and the Galileo satellite signals realize the integral multiple of the least common multiple of the amplification to the preset gain with the same amplitude.

As a preferred embodiment of the present invention, the multi-system signal amplification module includes a plurality of signal amplification circuits integrated therein, and a gain adjustment unit for adjusting the signal amplification circuits to a preset gain, wherein the gain adjustment unit is used for adjusting and setting the signal amplification circuits to the preset gains of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal, and the Galileo satellite signal, and implementing the least common multiple step amplification of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal, and the Galileo satellite signal by integer multiples to a same amplitude according to the preset gains.

As a preferred embodiment of the present invention, the signal amplification circuits are respectively in one-to-one communication connection with the GPS satellite system correlator channel group, the BDS satellite system correlator channel group, the GLONASS satellite system correlator channel group, and the Galileo satellite system correlator channel group.

As a preferable aspect of the present invention, the preset gain section includes a number product of a first gain section of a first-stage gain-adjustable amplification circuit and a second gain section of a second-stage gain-adjustable amplification circuit in the signal amplification circuit, and the preset gain is the number product of the first-stage gain and the second-stage gain.

Compared with the prior art, the invention has the following beneficial effects:

the invention is provided with two-stage gain adjustable amplifying circuits for superposition to enlarge the gain section of signal amplification and realize controllable signal amplification gain, can be adapted to the requirement reduction limitation of various signal amplification, has wide application range, simultaneously respectively receives GPS satellite signals, BDS satellite signals, GLONASS satellite signals and Galileo satellite signals in GNSS satellite signals separately and amplifies the signals to the same amplitude according to the preset gain in a receiver consisting of the two-stage gain adjustable amplifying circuits, ensures the amplitude regularity of various satellite signals, and improves the utilization rate of signal data in positioning calculation to finally improve the positioning precision by visually analyzing or calculating the frequency domain regularity.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

Fig. 1 is a schematic diagram of a signal amplifying circuit according to an embodiment of the present invention;

fig. 2 is a block diagram of a receiver according to an embodiment of the present invention.

The reference numerals in the drawings denote the following, respectively:

1-a multi-system signal amplification module; 2-a multi-system correlator module; and 3-a multi-system gain determination module.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-2, the present invention provides a signal amplifying circuit for a GNSS receiver, including a first stage gain adjustable amplifying circuit and a second stage gain adjustable amplifying circuit, the first-stage gain adjustable amplifying circuit and the second-stage gain adjustable amplifying circuit are connected to form a signal amplifying path for amplifying the GNSS satellite signal according to a preset gain, the first-stage gain adjustable amplifying circuit is used for performing first-stage gain adjustable amplification on the GNSS satellite signals in a first gain interval, the second-stage gain adjustable amplifying circuit is used for performing second-stage gain adjustable amplification on the GNSS satellite signals, which are subjected to first-stage gain adjustable amplification by the first-stage gain adjustable amplifying circuit, in a second gain interval so as to perform first-stage adjustable amplification and second-stage adjustable amplification on the GNSS satellite signals, so that the amplification effect of preset gain is achieved.

The first-stage gain adjustable amplifying circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth adjustable resistor R4, a fifth resistor R5, a first capacitor C1, a first diode D1, a second diode D2, a first power supply V1, a second power supply V2 and a first amplifier U1, wherein,

one end of the first resistor R1 is electrically connected to the 3 rd pin of the first amplifier U1, one end of the third resistor R3, one end of the second resistor R2 and one end of the first capacitor C1 are electrically connected to the 2 nd pin of the first amplifier U1, one end of the fifth resistor R5, one end of the first diode D1 and the positive end of the second power source V2 are electrically connected to the 7 th pin of the first amplifier U1, two ends of the non-adjustable end of the fourth adjustable resistor R4 are electrically connected to the 1 st pin and the 8 th pin of the first amplifier U1, the adjustable end of the fourth adjustable resistor R4 is electrically connected to the other end of the fifth resistor R5, the other end of the first capacitor C1, the other end of the second resistor R2, the other end of the first diode D1 and one end of the second diode D2 are electrically connected to the first pin 366 of the first amplifier U1, the other end of the second diode D2 and the negative terminal of the first power source V1 are electrically connected to the 4 th pin of the first amplifier U1, and the other end of the first resistor R1, the other end of the second power source V2, the other end of the third resistor R3, and the other end of the first power source V1 are grounded, respectively.

The second-stage gain-adjustable amplifying circuit comprises a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a second capacitor C2, a third diode D3, a fourth diode D4 and a second amplifier U2, wherein,

a pin 6 of the first amplifier U1 is electrically connected to a pin 3 of the second amplifier U2, one end of the seventh resistor R7, one end of the sixth resistor R6 and one end of the second capacitor C2 are respectively electrically connected to a pin 2 of the second amplifier U2, one end of the ninth resistor R9, one end of the third diode D3 and the positive end of the second power source V2 are respectively electrically connected to a pin 7 of the second amplifier U2, two ends of the non-adjusting end of the eighth adjustable resistor R8 are respectively electrically connected to a pin 1 and a pin 8 of the second amplifier U2, the adjusting end of the eighth adjustable resistor R8 is electrically connected to the other end of the ninth resistor R9, the other end of the second capacitor C2, the other end of the sixth resistor R6, the other end of the third diode D3 and one end of the fourth diode D4 are electrically connected to a pin 3 of the second amplifier U2, the other end of the fourth diode D4 is electrically connected to the negative terminal of the first power source V1 and the 4 th pin of the second amplifier U2, and the other end of the seventh resistor R3 is grounded.

The first gain interval is determined by the regulation interval of the regulation end of the fourth regulation resistor R4 and the regulation end dwell position is characterized as a first-stage gain, the second gain interval is determined by the regulation interval of the regulation end of the eighth regulation resistor R8 and the regulation end dwell position is characterized as a second-stage gain.

The adjusting ends of the fourth adjusting resistor R4 and the eighth adjusting resistor R8, which are adjustable resistors, slide between two ends of the non-adjusting end, respectively, the amplification gains of the first gain adjustable amplifying circuit and the second gain adjustable amplifying circuit can be changed to form a first gain section and a second gain section for a user to select, the adjusting ends slide to the two ends of the non-adjusting end to respectively reach the maximum value and the minimum value of the amplification gains of the first gain adjustable amplifying circuit and the second gain adjustable amplifying circuit as the section closed end points of the first gain section and the second gain section, that is, the value range of the first gain adjustable amplifying circuit is the first gain section, the value range of the second gain adjustable amplifying circuit is the second gain section, and the user selects the first gain and the stop position of the adjusting ends of the fourth adjusting resistor R4 and the eighth adjusting resistor R8 according to the preset gain required by the user And the second-stage gain is obtained by only observing that the multiplication of the first-stage gain and the second-stage gain is equal to the preset gain.

By utilizing two-stage adjustable amplification, the gain range of signal amplification can be multiplied, the applicability of the signal amplification circuit is effectively expanded, the requirements of various signal amplification are met, the gain adjustment can realize the controllability of the amplitude of the amplified signal, the same-amplitude amplification of subsequent satellite signals is convenient to realize, and the regular form after the signal amplification is kept.

As shown in fig. 2, based on the signal amplification circuit, the invention provides a receiver, which comprises the multi-system signal amplification module 1, the multi-system correlator module 2 and the multi-system gain determination module 3, wherein,

the multi-system correlator module 2 is used for respectively and singly receiving a GPS satellite signal, a BDS satellite signal, a GLONASS satellite signal and a Galileo satellite signal of a GNSS satellite signal;

the multi-system correlator module 2 comprises a GPS satellite system correlator channel group, a BDS satellite system correlator channel group, a GLONASS satellite system correlator channel group and a Galileo satellite system correlator channel group, wherein the GPS satellite system correlator channel group comprises correlator channels for separately receiving a plurality of GPS satellite signals, the BDS satellite system correlator channel group comprises correlator channels for separately receiving a plurality of BDS satellite signals, the GLONASS satellite system correlator channel group comprises correlator channels for separately receiving a plurality of GLONASS satellite signals, and the Galileo satellite system correlator channel group comprises correlator channels for separately receiving a plurality of Galileo satellite signals.

The GNSS system generally refers to a system that allows position location (positionfix) to be determined based on GNSS signals received from a plurality of GNSS satellites, and the GNSS system includes satellite systems of the types of GPS satellite system, BDS satellite system, GLONASS satellite system, and Galileo satellite system, and the GPS satellite system, BDS satellite system, GLONASS satellite system, and Galileo satellite system, and each of the GPS satellite system, BDS satellite system, GLONASS satellite system, and Galileo satellite system, when performing positioning, generally uses a plurality of GPS satellites, a plurality of BDS satellites, a plurality of GLONASS satellites, and a plurality of Galileo satellites to perform satellite positioning independently in order to improve accuracy, and thus requires a receiver to capture satellite signals of a plurality of GPS satellites, a plurality of BDS satellites, a plurality of GLONASS satellites, and a plurality of Galileo satellites in real time The method comprises the steps of receiving satellite signals of a plurality of BDS satellites, a plurality of GLONASS satellites and a plurality of Galileo satellites, wherein a GPS satellite system correlator channel group comprises correlator channels for independently receiving a plurality of GPS satellite signals, the GPS satellite signals received in the correlator channels for independently receiving the plurality of GPS satellite signals are weak and cannot be used for direct analysis, signal amplification is required to be performed to complete signal characteristic display, amplitude variation of the plurality of GPS satellite signals is difficult to perform uniform analysis, the amplified GPS satellite signals need to be kept consistent in amplitude and frequency coordinate system to perform uniform frequency domain analysis, pseudo-range calculation in subsequent positioning analysis is performed, the condition of the rest BDS satellite signals, the GLONASS satellite signals and the Galileo satellite signals is consistent with that of the GPS satellite signals, and therefore the GPS satellite signals, the GLONASS satellites, the Galileo satellite signals and the GPS satellite signals can be achieved by setting preset gains of respective signal amplification, The plurality of BDS satellite signals, the plurality of GLONASS satellite signals and the plurality of Galileo satellite signals are amplified to the same amplitude.

The multi-system gain determining module 3 is used for determining preset gains of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal by using original amplitudes of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal according to a signal same amplitude principle;

the multi-system gain determining module 3 comprises a GPS satellite signal collecting component, a BDS satellite signal collecting component, a GLONASS satellite signal collecting component and a Galileo satellite signal collecting component which are respectively arranged at signal output ends of a GPS satellite system correlator channel group, a BDS satellite system correlator channel group, a GLONASS satellite system correlator channel group and a Galileo satellite system correlator channel group so as to respectively collect original amplitudes of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal, and a data processing unit which is in communication connection with data output ends of the GPS satellite signal collecting component, the BDS satellite signal collecting component, the GLONASS satellite signal collecting component and the Galileo satellite signal collecting component, wherein the data processing unit receives the original amplitudes of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal and respectively determines to respectively determine the original amplitudes of the GPS satellite signal, the GLONASS satellite signal and the Galileo satellite signal according to the original amplitudes, The BDS satellite signals, the GLONASS satellite signals and the Galileo satellite signals realize the integral multiple of the least common multiple of the amplification to the preset gain with the same amplitude.

Specifically, the original amplitudes of a plurality of GPS satellite signals are acquired by a GPS satellite signal acquisition assembly in a correlator channel for independently receiving the plurality of GPS satellite signals, the least common multiple of the original amplitudes of the plurality of GPS satellite signals is calculated, an integral multiple of the least common multiple is selected as a preset gain for amplifying the GPS satellite signals, similarly, the original amplitudes of the plurality of BDS satellite signals are acquired by a BDS satellite signal acquisition assembly in the correlator channel for independently receiving the plurality of BDS satellite signals, the least common multiple of the original amplitudes of the plurality of BDS satellite signals is calculated, an integral multiple of the least common multiple is selected as the preset gain for amplifying the BDS satellite signals, the original amplitudes of the plurality of GLONASS satellite signals are acquired by the GLONASS satellite signal acquisition assembly in the correlator channel for independently receiving the plurality of GLONASS satellite signals, and the least common multiple of the original amplitudes of the plurality of GLONASS satellite signals is calculated, and selecting the integral multiple of the minimum common multiple as a preset gain for amplifying the GLONASS satellite signals, acquiring the original amplitudes of the plurality of Galileo satellite signals by using the Galileo satellite signal acquisition assembly in a correlator channel for independently receiving the plurality of Galileo satellite signals, calculating the minimum common multiple of the original amplitudes of the plurality of Galileo satellite signals, and selecting the integral multiple of the minimum common multiple as the preset gain for amplifying the Galileo satellite signals.

The multi-system signal amplification module 1 is used for performing adjustable amplification on the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal according to preset gains of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal so as to keep the amplification amplitudes of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal and the Galileo satellite signal uniform, regular and controllable.

The multi-system signal amplification module 1 comprises a plurality of signal amplification circuits and gain adjustment units, wherein the signal amplification circuits are integrated with the gain adjustment units, the gain adjustment units are respectively used for adjusting the signal amplification circuits to preset gains, the gain adjustment units are respectively used for correspondingly adjusting and setting the signal amplification circuits to the preset gains of the GPS satellite signals, the BDS satellite signals, the GLONASS satellite signals and the Galileo satellite signals, and the minimum common multiple of integral multiple of the GPS satellite signals, the BDS satellite signals, the GLONASS satellite signals and the Galileo satellite signals are amplified to the same amplitude according to the preset gains.

The original signals of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal, and the Galileo satellite signal are input to the signal amplification circuit from the 3 rd pin of the first amplifier U1, and the amplified signals of the GPS satellite signal, the BDS satellite signal, the GLONASS satellite signal, and the Galileo satellite signal are output from the 6 th pin of the second amplifier U2.

Specifically, given the preset gain of the GPS satellite signal amplification, the adjusting terminals of the fourth adjusting resistor R4 and the eighth adjusting resistor R8 of the plurality of signal amplifying circuits electrically connected to the correlator channels for individually receiving the plurality of GPS satellite signals are controlled such that the product of the first gain and the second gain of the first gain adjustable amplifying circuit and the second gain adjustable amplifying circuit is equal to the preset gain of the GPS satellite signal amplification, and similarly, given the preset gain of the BDS satellite signal amplification, the adjusting terminals of the fourth adjusting resistor R4 and the eighth adjusting resistor R8 of the plurality of signal amplifying circuits electrically connected to the correlator channels for individually receiving the plurality of BDS satellite signals are controlled such that the product of the first gain and the second gain of the first gain adjustable amplifying circuit and the second gain adjustable amplifying circuit is equal to the preset gain of the BDS satellite signal amplification, and controlling the adjusting ends of the fourth adjusting resistor R4 and the eighth adjusting resistor R8 of the plurality of signal amplifying circuits electrically connected with the correlator channels for independently receiving the plurality of GLONASS satellite signals so that the product of the first gain and the second gain of the first gain adjustable amplifying circuit and the second gain adjustable amplifying circuit is equal to the preset gain for amplifying the GLONASS satellite signals, and controlling the adjusting ends of the fourth adjusting resistor R4 and the eighth adjusting resistor R8 of the plurality of signal amplifying circuits electrically connected with the correlator channels for independently receiving the plurality of Galileo satellite signals so that the product of the first gain and the second gain of the first gain adjustable amplifying circuit and the second gain adjustable amplifying circuit is equal to the preset gain for amplifying the Galileo satellite signals.

The signal amplification circuits are respectively in one-to-one corresponding communication connection with the GPS satellite system correlator channel group, the BDS satellite system correlator channel group, the GLONASS satellite system correlator channel group and the Galileo satellite system correlator channel group.

The preset gain section comprises the number product of a first gain section of a first-stage gain adjustable amplification circuit and a second gain section of a second-stage gain adjustable amplification circuit in the signal amplification circuit, and the preset gain is the number product of the first-stage gain and the second-stage gain.

The invention is provided with two-stage gain adjustable amplifying circuits for superposition to enlarge the gain section of signal amplification and realize controllable signal amplification gain, can be adapted to the requirement reduction limitation of various signal amplification, has wide application range, simultaneously respectively receives GPS satellite signals, BDS satellite signals, GLONASS satellite signals and Galileo satellite signals in GNSS satellite signals separately and amplifies the signals to the same amplitude according to the preset gain in a receiver consisting of the two-stage gain adjustable amplifying circuits, ensures the amplitude regularity of various satellite signals, and improves the utilization rate of signal data in positioning calculation to finally improve the positioning precision by visually analyzing or calculating the frequency domain regularity.

The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present application and such modifications and equivalents should also be considered to be within the scope of the present application.