阅读说明：本技术 一种低温接收机用双档噪声定标组件 (Low temperature receiver is with two grades of noise calibration subassemblies ) 是由 何川 王生旺 王自力 孙婷婷 刘文其 吴志华 于 2020-06-08 设计创作，主要内容包括：本发明公开了一种低温接收机用双档噪声定标组件,包括有直流稳压与控制模块,噪声源电路,由第一单刀双掷开关、高衰减器、低衰减器、第二单刀双掷开关、功率分配器和两个输出端SMA连接器顺次连接组成的双档开关电路；噪声源电路产生并输出宽带噪声信号,双档开关电路的输入端与噪声源电路的输出端连接,噪声源电路、第一单刀双掷开关、第二单刀双掷开关均与直流稳压与控制模块连接,直流稳压与控制模块用于提供直流电源给噪声源电路激发噪声,直流稳压与控制模块用于控制驱动第一单刀双掷开关和第二单刀双掷开关。(The invention discloses a double-gear noise scaling component for a low-temperature receiver, which comprises a direct-current voltage-stabilizing and control module, a noise source circuit, a double-gear switch circuit and a power supply circuit, wherein the double-gear switch circuit is formed by sequentially connecting a first single-pole double-throw switch, a high attenuator, a low attenuator, a second single-pole double-throw switch, a power distributor and two output end SMA connectors; the noise source circuit generates and outputs a broadband noise signal, the input end of the double-gear switch circuit is connected with the output end of the noise source circuit, the first single-pole double-throw switch and the second single-pole double-throw switch are all connected with the direct-current voltage stabilizing and controlling module, the direct-current voltage stabilizing and controlling module is used for providing a direct-current power supply for the noise source circuit to excite noise, and the direct-current voltage stabilizing and controlling module is used for controlling and driving the first single-pole double-throw switch and the second single-pole double-throw switch.)

1. The utility model provides a two grades of noise calibration subassemblies for low temperature receiver which characterized in that: the system comprises a direct-current voltage stabilization and control module, a noise source circuit, a double-gear switch circuit consisting of a first single-pole double-throw switch, a high attenuator, a low attenuator, a second single-pole double-throw switch, a power distributor and two output end SMA connectors; the broadband noise source circuit generates and outputs broadband noise signals, the movable end of the first single-pole double-throw switch is connected with the output end of the noise source circuit, the two immovable ends of the first single-pole double-throw switch are respectively connected with the input end of the high attenuator and the input end of the low attenuator, the two immovable ends of the second single-pole double-throw switch are respectively connected with the output end of the high attenuator and the output end of the low attenuator, the movable end of the second single-pole double-throw switch is connected with the input end of the power distributor, and the two output ends of the power distributor are respectively connected with a corresponding output end SMA connector; the noise source circuit, the first single-pole double-throw switch and the second single-pole double-throw switch are all connected with the direct-current voltage stabilizing and controlling module, the direct-current voltage stabilizing and controlling module is used for providing a direct-current power supply for the noise source circuit to excite noise, and the direct-current voltage stabilizing and controlling module is used for controlling and driving the moving ends of the first single-pole double-throw switch and the second single-pole double-throw switch.

2. The dual-range noise scaling module for a cryogenic receiver of claim 1, wherein: the noise source circuit comprises a resistor R1, an inductor L1, a capacitor C1, a capacitor C2, a noise diode D1 and a matching attenuator T1, one end of the resistor R1 is connected with a direct-current power supply provided by a direct-current voltage-stabilizing and control module, the other end of the resistor R1 is connected with one end of the inductor L1, one end of a capacitor C1, one end of the capacitor C2 and the cathode of the noise diode D1 are connected with the other end of the inductor L1, the other end of the capacitor C2 and the anode of the noise diode D1 are grounded, the other end of the capacitor C1 is connected with the input end of the matching attenuator, and the output end of the matching attenuator is used as the output end of the noise source circuit.

3. The dual-range noise scaling module for a cryogenic receiver of claim 1, wherein: the attenuation of the high attenuator is 10 times of that of the low attenuator.

4. The dual-range noise scaling module for a cryogenic receiver of claim 1, wherein: the output end of the noise source circuit is connected with the input end of the double-gear switch circuit through a microstrip line.

5. The dual-range noise scaling module for a cryogenic receiver of claim 1, wherein: the first single-pole double-throw switch, the high attenuator, the low attenuator, the second single-pole double-throw switch and the power divider are all welded on the microstrip circuit.

6. The dual-range noise scaling module for a cryogenic receiver of claim 1, wherein: the first single-pole double-throw switch and the second single-pole double-throw switch are both FET single-pole double-throw switches, and the direct-current voltage stabilizing and controlling module is a single chip microcomputer or a hardware logic circuit.

7. The dual-range noise scaling module for a cryogenic receiver of claim 1, wherein: the noise source circuit is arranged on the constant temperature module, and the constant temperature module is connected with the direct current voltage stabilization and control module to realize automatic constant temperature monitoring.

8. The dual-range noise scaling module for a cryogenic receiver of claim 7, wherein: the constant temperature module adopts a semiconductor thermoelectric refrigerating device.

9. The dual-range noise scaling module for a cryogenic receiver of claim 1, wherein: the low temperature receiver is with two grades of noise calibration subassemblies including the casing, the casing on be connected with two output SMA connectors, noise source circuit and two grades of switch circuits all set up in the casing, two output of power divider pass through microstrip circuit and are connected with two output SMA connectors.

Technical Field

The invention relates to the technical field of microwave devices, in particular to a double-gear noise calibration assembly for a low-temperature receiver.

Background

The main observation target of the low-temperature receiving system in actual use is a radio source in the universe, the environmental background noise is very low, when the azimuth and the pitching of the antenna change, the background noise changes, and if the noise temperature of the system is not calibrated in time, the testing precision is seriously influenced. The low-temperature receiver is difficult to measure the noise temperature of the system at any time by using a noise coefficient analyzer during observation.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a double-gear noise calibration component for a low-temperature receiver, which provides a stable noise calibration signal, and the noise calibration signal is injected from a coupling interface at the front end of the low-temperature receiver and is used for calibrating the noise temperature of the low-temperature receiver in different observation modes and improving the observation stability.

The technical scheme of the invention is as follows:

a double-gear noise scaling component for a low-temperature receiver comprises a direct-current voltage-stabilizing and control module, a noise source circuit, a double-gear switch circuit and a power divider, wherein the double-gear switch circuit consists of a first single-pole double-throw switch, a high attenuator, a low attenuator, a second single-pole double-throw switch, and two output end SMA connectors; the broadband noise source circuit generates and outputs broadband noise signals, the movable end of the first single-pole double-throw switch is connected with the output end of the noise source circuit, the two immovable ends of the first single-pole double-throw switch are respectively connected with the input end of the high attenuator and the input end of the low attenuator, the two immovable ends of the second single-pole double-throw switch are respectively connected with the output end of the high attenuator and the output end of the low attenuator, the movable end of the second single-pole double-throw switch is connected with the input end of the power distributor, and the two output ends of the power distributor are respectively connected with a corresponding output end SMA connector; the noise source circuit, the first single-pole double-throw switch and the second single-pole double-throw switch are all connected with the direct-current voltage stabilizing and controlling module, the direct-current voltage stabilizing and controlling module is used for providing a direct-current power supply for the noise source circuit to excite noise, and the direct-current voltage stabilizing and controlling module is used for controlling and driving the moving ends of the first single-pole double-throw switch and the second single-pole double-throw switch.

The noise source circuit comprises a resistor R1, an inductor L1, a capacitor C1, a capacitor C2, a noise diode D1 and a matching attenuator T1, one end of the resistor R1 is connected with a direct-current power supply provided by a direct-current voltage-stabilizing and control module, the other end of the resistor R1 is connected with one end of the inductor L1, one end of a capacitor C1, one end of the capacitor C2 and the cathode of the noise diode D1 are connected with the other end of the inductor L1, the other end of the capacitor C2 and the anode of the noise diode D1 are grounded, the other end of the capacitor C1 is connected with the input end of the matching attenuator, and the output end of the matching attenuator is used as the output end of the noise source circuit.

The attenuation of the high attenuator is 10 times of that of the low attenuator.

The output end of the noise source circuit is connected with the input end of the double-gear switch circuit through a microstrip line.

The first single-pole double-throw switch, the high attenuator, the low attenuator, the second single-pole double-throw switch and the power divider are all welded on the microstrip circuit.

The first single-pole double-throw switch and the second single-pole double-throw switch are both FET single-pole double-throw switches, and the direct-current voltage stabilizing and controlling module is a single chip microcomputer or a hardware logic circuit.

The noise source circuit is arranged on the constant temperature module, and the constant temperature module is connected with the direct current voltage stabilization and control module to realize automatic constant temperature monitoring.

The constant temperature module adopts a semiconductor thermoelectric refrigerating device.

The low temperature receiver is with two grades of noise calibration subassemblies including the casing, the casing on be connected with two output SMA connectors, noise source circuit and two grades of switch circuits all set up in the casing, two output of power divider pass through microstrip circuit and are connected with two output SMA connectors.

The invention has the advantages that:

the double-gear switch circuit can rapidly switch the state of two-gear output signals and the state of no output signal, and the output two-gear noise calibration signal realizes different purposes, namely, the high-gear noise calibration signal determines the noise temperature of the low-temperature receiver in the initial state, and the low-gear noise calibration signal determines the noise temperature of the low-temperature receiver in the observation state; the noise source circuit is provided with the constant temperature module to monitor and maintain the physical temperature of the noise source circuit in real time, so that the influence of the environment is reduced.

In conclusion, the invention has the characteristics of various output states, stable signals and the like, and can conveniently and quickly calibrate the system noise temperature of the low-temperature receiver in the running state.

Drawings

Fig. 1 is a schematic view of the appearance structure of the present invention.

Fig. 2 is a schematic block diagram of the present invention.

Fig. 3 is a circuit diagram of the noise source circuit of the present invention.

Fig. 4 is a circuit diagram of the two-stage switch circuit of the present invention.

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.

Referring to fig. 1-4, a double-gear noise calibration assembly for a low-temperature receiver includes a housing 1, a dc voltage regulation and control module 3 disposed in the housing 1, a noise source circuit 5, a constant temperature module 4, a first single-pole double-throw switch T2, a high attenuator T3, a low attenuator T4, a second single-pole double-throw switch T5, a power divider T6, and two output SMA connectors 2 connected to the housing; the first single-pole double-throw switch T2 and the second single-pole double-throw switch T5 both adopt FET single-pole double-throw switches, and the direct-current voltage stabilizing and controlling module 3 adopts a single chip microcomputer or a hardware logic circuit;

the noise source circuit 5 comprises a resistor R1, an inductor L1, a capacitor C1, a capacitor C2, a noise diode D1 and a matching attenuator T1, wherein one end of the resistor R1 is connected with a direct-current voltage-stabilizing and control module-provided direct-current power supply, the other end of the resistor R1 is connected with one end of the inductor L1, one end of a capacitor C1, one end of the capacitor C2 and the cathode of the noise diode D1 are all connected with the other end of the inductor L1, the other end of the capacitor C2 and the anode of the noise diode D1 are all grounded, the other end of the capacitor C1 is connected with the input end of the matching attenuator, and the output end of the matching attenuator is used as the output end of; after a direct-current power supply is provided by the direct-current voltage stabilizing and controlling module 3, a filter network consisting of a resistor R1, an inductor L1, a capacitor C1 and a capacitor C2 is added to the cathode of the noise diode D1 to excite a broadband white noise signal capable of covering 1GHz-15GHz, the broadband white noise signal is subjected to impedance matching through a matching attenuator T1 and then is sent to the input end of the double-gear switching circuit through microstrip current, in order to ensure the stability of the noise signal, a semiconductor thermoelectric refrigeration device is selected as a constant temperature module, the ambient temperature of the noise source circuit is kept constant at +40 ℃, and the constant temperature module is connected with the direct-current voltage stabilizing and controlling module for automatic constant temperature monitoring;

the first single-pole double-throw switch T2, the high attenuator T3, the low attenuator T4, the second single-pole double-throw switch T5 and the power divider T6 are welded on the microstrip circuit to form a double-stage switch circuit; the movable end of a first single-pole double-throw switch T2 is used as the input end of a double-gear switch circuit and is connected with the output end of a noise source circuit through a microstrip line, two immovable ends of a first single-pole double-throw switch T2 are respectively connected with the input end of a high attenuator T3 and the input end of a low attenuator T4, two immovable ends of a second single-pole double-throw switch T5 are respectively connected with the output end of a high attenuator T3 and the output end of a low attenuator T4, the movable end of a second single-pole double-throw switch T5 is connected with the input end of a power distributor T6, and two output ends of a power distributor T6 are respectively connected with a corresponding output end SMA connector 2 through a microstrip circuit; the first single-pole double-throw switch T2 and the second single-pole double-throw switch T5 are both connected with the direct-current voltage-stabilizing and control module 3, and the direct-current voltage-stabilizing and control module 3 is used for controlling and driving the movable ends of the first single-pole double-throw switch T2 and the second single-pole double-throw switch T5, so that the switching speed of the working state of the component is less than 10 microseconds; the attenuation of the high attenuator T4 is 10 times of that of the low attenuator T4, that is, the noise amplitude of the low-grade noise scaling signal output by the two-grade switch circuit is one tenth of that of the high-grade noise scaling signal.

When the direct-current voltage-stabilizing and control module 3 controls the first single-pole double-throw switch T2 and the second single-pole double-throw switch T5 to be connected with the high attenuator T3, the output end of the power divider T6 outputs a low-level noise scaling signal; when the direct-current voltage-stabilizing and control module 3 controls the first single-pole double-throw switch T2 and the second single-pole double-throw switch T5 to be connected with the low attenuator T4, the high-grade noise calibration signal is output by the power divider T6; when the direct-current voltage-stabilizing and control module 3 controls the first single-pole double-throw switch T2 to be connected with the high attenuator T3, the second single-pole double-throw switch T5 to be connected with the low attenuator T4 or controls the first single-pole double-throw switch T2 to be connected with the low attenuator T4, and the second single-pole double-throw switch T5 to be connected with the high attenuator T3, the power divider T6 is in a no-signal output state, and since the standing-wave ratio of the high attenuator T3 is superior to that of the low attenuator T4, the matching performance of the circuit is better, and the noise injection signal can be turned off without an external control switch.

The invention is installed near the low temperature receiver, the two output paths of double-gear noise calibration signals are respectively connected to the left-hand and right-hand coupling injection ports of the low temperature receiver through coaxial radio frequency, and are sent to the refrigeration microwave link of the low temperature receiver, and are processed by the data terminal after being processed by low temperature low noise amplification, frequency conversion, filtering and the like. The low-temperature receiver can generate an output double-gear noise scaling signal and realize a no-signal output state by using the double-gear noise scaling component, the high-grade noise scaling signal is controlled and output at the beginning of observation, a Y factor obtained by the ratio of the output power of the high-grade noise scaling signal to the no-signal output state is calculated, and the noise temperature of a low-temperature receiving link in the initial state is calculated; and controlling to output a low-grade noise calibration signal during radio observation, and determining the noise temperature of the low-temperature receiving link under the observation state.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.