阅读说明：本技术 一种2.4～2.48GHz/50W线性调频发射机 (2.4 ~ 2.48GHz/50W linear frequency modulation transmitter ) 是由 孙飞 王黎明 张鹏 蔡德发 于 2020-07-10 设计创作，主要内容包括：本发明公开了一种2.4～2.48GHz/50W线性调频发射机,所述发射机包括线性调频源单元、固态功放单元、控制单元、电源单元、风冷单元；所述控制单元的信号输入端与通信信息源相连,输出端分别与线性调频源单元、固态功放单元、风冷单元的输入端相连；所述线性调频源单元的输出端与固态功放单元输入端相连；电源单元的输入端与电源输入端相连,输出端控制单元、风冷单元相连为系统供电。本发明具有设计合理、效率高、性能可靠等优点。(The invention discloses a 2.4-2.48 GHz/50W linear frequency modulation transmitter, which comprises a linear frequency modulation source unit, a solid-state power amplification unit, a control unit, a power supply unit and an air cooling unit, wherein the linear frequency modulation source unit is connected with the solid-state power amplification unit; the signal input end of the control unit is connected with a communication information source, and the output end of the control unit is respectively connected with the input ends of the linear frequency modulation source unit, the solid-state power amplification unit and the air cooling unit; the output end of the linear frequency modulation source unit is connected with the input end of the solid-state power amplification unit; the input end of the power supply unit is connected with the power supply input end, and the output end control unit and the air cooling unit are connected to supply power to the system. The invention has the advantages of reasonable design, high efficiency, reliable performance and the like.)

1. The utility model provides a 2.4 ~ 2.48GHz/50W linear FM transmitter which characterized in that: the transmitter comprises a linear frequency modulation unit, a solid-state power amplification unit, a control unit, a power supply unit and an air cooling unit;

the signal input end of the control unit is connected with a communication information source, and the output end of the control unit is respectively connected with the input ends of the linear frequency modulation unit, the solid-state power amplification unit and the air cooling unit;

the output end of the linear frequency modulation unit is connected with the input end of the solid-state power amplification unit;

the input end of the power supply unit is connected with the power supply input end, and the output end control unit and the air cooling unit are connected to supply power to the system.

2. The linear FM transmitter of claim 1, wherein said linear FM transmitter is 2.4-2.48 GHz/50W, wherein: the linear frequency modulation unit is formed by electrically connecting an FPGA, a frequency synthesizer, a digital-to-analog converter (ADC), an amplifier, a filter and a storage, reset and interface chip.

3. The linear FM transmitter of claim 1, wherein said linear FM transmitter is 2.4-2.48 GHz/50W, wherein: the solid-state power amplifier unit is formed by electrically connecting an input attenuation unit, an amplitude limiter unit, a preceding-stage power amplifier unit, a final-stage power amplifier unit, an output filter and a coupler.

4. The linear FM transmitter of claim 3, wherein said linear FM transmitter is 2.4-2.48 GHz/50W, wherein: the output filter adopts a cavity filter.

5. The linear FM transmitter of claim 3, wherein said linear FM transmitter is 2.4-2.48 GHz/50W, wherein: the output coupler mainly comprises 2 paths of output coupling circuits, wherein one path is used as a transmission power coupling circuit, and the other path is used as a reflection power coupling circuit.

6. The linear FM transmitter of claim 3, wherein said linear FM transmitter is 2.4-2.48 GHz/50W, wherein: the pre-stage amplification unit consists of an attenuator, a first-stage amplifier, a temperature compensation attenuator, a second-stage amplifier, an isolator and a third-stage amplifier.

7. The linear FM transmitter of claim 3, wherein said linear FM transmitter is 2.4-2.48 GHz/50W, wherein: the final power amplifier unit consists of 1 power amplifier tube, a matching circuit, a biasing circuit and a modulation circuit.

8. The linear FM transmitter of claim 1, wherein said linear FM transmitter is 2.4-2.48 GHz/50W, wherein: the control unit consists of a sampling unit and a protection control unit.

9. The linear FM transmitter of claim 1, wherein said linear FM transmitter is 2.4-2.48 GHz/50W, wherein: the air cooling unit is 2 fans of 60m 3/h.

Technical Field

The invention relates to the field of frequency modulation transmitters, in particular to a linear frequency modulation transmitter.

Background

As is well known, a linear frequency modulation transmitter is a key device of a radar system, and the performance of the linear frequency modulation transmitter is directly related to the reliability of the whole radar system. Therefore, the transmitter which has the characteristics of safety, stability, reliability, long service life and convenient maintenance can better meet the requirements of users.

However, the power, stability and other aspects of the existing linear fm transmitter cannot meet the modern technical requirements, and an updated fm transmitter is urgently needed.

Disclosure of Invention

The invention aims to provide a 2.4-2.48 GHz/50W linear frequency modulation transmitter which is reasonable in design, high in efficiency and reliable in performance.

In order to realize the purpose, the following technical scheme is adopted: the transmitter comprises a linear frequency modulation unit, a solid-state power amplification unit, a control unit, a power supply unit and an air cooling unit;

the signal input end of the control unit is connected with a communication information source, and the output end of the control unit is respectively connected with the input ends of the linear frequency modulation unit, the solid-state power amplification unit and the air cooling unit;

the output end of the linear frequency modulation unit is connected with the input end of the solid-state power amplification unit;

the input end of the power supply unit is connected with the power supply input end, and the output end control unit and the air cooling unit are connected to supply power to the system.

Furthermore, the linear frequency modulation unit is formed by electrically connecting an FPGA, a frequency synthesizer, a digital-to-analog converter (ADC), an amplifier, a filter and a storage, reset and interface chip.

Furthermore, the solid-state power amplifier unit is formed by electrically connecting an input attenuation unit, a limiter unit, a preceding-stage power amplifier unit, a final-stage power amplifier unit, an output filter and a coupler.

Further, the output filter is a cavity filter.

Furthermore, the output coupler mainly comprises 2 paths of output coupling circuits, wherein one path is used as a transmission power coupling circuit, and the other path is used as a reflection power coupling circuit.

Furthermore, the pre-stage amplification unit consists of an attenuator, a first-stage amplifier, a temperature compensation attenuator, a second-stage amplifier, an isolator and a third-stage amplifier.

Furthermore, the final power amplifier unit consists of 1 power amplifier tube, a matching circuit, a bias circuit, a modulation circuit and the like.

Furthermore, the control unit is composed of a sampling unit and a protection control unit.

Further, the air cooling unit is 2 fans of 60m 3/h.

Compared with the prior art, the invention has the following advantages:

by reasonably designing the power amplifier link and optimizing the link power and gain distribution, the high efficiency and high reliability of the whole machine are ensured, and the requirements on volume and weight are met, so that the advancement of the power amplifier is ensured.

Drawings

Fig. 1 is a block diagram of a linear frequency modulated transmitter of the present invention.

Fig. 2 is a block diagram of a chirp unit of the present invention.

Fig. 3 is a block diagram of the solid-state power amplifier unit of the present invention.

Fig. 4 is a block diagram of a preceding stage power amplifier module of the present invention.

Fig. 5 is a block diagram of the final power amplifier module of the present invention.

Fig. 6 is a block diagram of a control unit 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.

It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.

As shown in fig. 1, the transmitter of the present invention includes a chirp unit, a solid-state power amplification unit, a control unit, a power supply unit, and an air cooling unit;

the signal input end of the control unit is connected with a communication information source, and the output end of the control unit is respectively connected with the input ends of the linear frequency modulation unit, the solid-state power amplification unit and the air cooling unit;

as shown in fig. 2, the output end of the chirp unit is connected to the input end of the solid-state power amplification unit;

the input end of the power supply unit is connected with the power supply input end, and the output end control unit and the air cooling unit are connected to supply power to the system.

The power supply unit consists of a positive-voltage power supply circuit and a negative-voltage power supply circuit and is used for providing power for the system. One part is supplied to the positive voltage power supply of the final power amplification unit and the preceding power amplification unit through the DC/DC converter, and the other part is supplied to the negative voltage power supply through the DC/DC converter.

The linear frequency modulation unit is formed by electrically connecting an FPGA, a frequency synthesizer, a digital-to-analog converter (ADC), an amplifier, a filter, a storage chip, a reset chip and an interface chip. The FPGA is a programmable logic chip, the frequency synthesizer mainly functions in providing a sampling clock for digital-to-analog conversion, the amplifier amplifies an analog video signal, the filter suppresses an out-of-band spurious signal output by the amplifier, and the storage, reset and interface chip is responsible for data storage, state reset and external interface of the FPGA. Direct frequency synthesis is employed, using a mature FPGA, a frequency synthesizer circuit and a high performance digital-to-analog converter (DAC). The amplifier and the filter amplify the linear frequency modulation signal generated by the linear frequency modulation unit and filter out-of-band signals.

As shown in fig. 3, the solid-state power amplifier unit is formed by electrically connecting an input attenuation unit, a limiter unit, a preceding power amplifier unit, a final power amplifier unit, an output filter and a coupler. The amplitude limiter limits the maximum amplitude of the input signal and prevents damage to subsequent devices caused by overdriving. The output power of the preceding-stage power amplifier is 2W, and the maximum output capacity is larger than 10W. The final power amplifier uses one power amplifier tube, and the output capacity is more than 100W.

The input attenuation is mainly used for adjusting the input power and improving the port matching. The output radio frequency signal enters a preceding stage power amplification unit for amplification, the preceding stage power amplification unit has a radio frequency turn-off function, the amplified radio frequency signal is sent to a final stage power amplification unit for amplification, then is filtered by an output filter, and finally is output through a coupler. The coupler coupling signals Po and Pr are respectively sent to the control unit for judgment and display.

As shown in fig. 4, the pre-stage amplification unit is composed of an attenuator, a first-stage amplifier, a temperature compensation attenuator, a second-stage amplifier, an isolator, and a third-stage amplifier. The temperature compensation attenuator can not only increase the interstage isolation of the amplifier and prevent the self-excitation phenomenon, but also play a role in adjusting the high and low temperature gains. The amplifier is controlled by the radio frequency modulation signal, and an isolator is adopted for isolation between the second-stage amplifier and the third-stage amplifier due to the fact that output power is high.

As shown in fig. 5, the final power amplifier unit includes 1 power amplifier tube, a matching circuit, a bias circuit, and a modulation circuit. The modulation circuit controls the power-on time sequence of the power amplifier tube, and meanwhile, the bias receives the control of an external signal, so that the power amplifier tube has a squelch function.

The output filter adopts a cavity filter, has the advantage of low loss, and is mainly used for filtering out-of-band noise signals generated by the final-stage power amplification unit.

The output coupler mainly comprises 2 paths of power coupling circuits, wherein one path of the power coupling circuit monitors output power, and the other path of the power coupling circuit monitors reflected power of a port.

As shown in fig. 6, the control unit is composed of a sampling unit and a protection control unit. The sampling unit has a communication function, and is mainly used for sampling and converting detection signal pulse signals of Po and Pr into power values, and sampling and converting working voltages of the temperature and power amplifier module into corresponding values. When the detected signal is larger than the set threshold, an overload fault is generated, and the state is sent to a protection control unit to uniformly output a protection control signal and report the fault state. The protection control unit is also controlled by the radio frequency modulation signal and the external control signal.

The control unit is responsible for the control of each functional unit and the collection, processing and monitoring of the working state, and receives and responds to the control and RS422 instructions of the system. The main control unit mainly comprises a sampling unit and a protection control unit, and has the main functions of:

1. identifying, analyzing, protecting and alarming the fault of the transmitter system;

2. detecting the voltage, the temperature, the output power and the reflected power of the whole transmitter system in real time;

3. controlling the on-off and the radio frequency on-off of the whole transmitter.

The air cooling unit is 2 fans of 60m 3/h. The air cooling unit is the premise of ensuring the stable and reliable work of the power amplifier, and is the key of influencing the reliable and fault-free work index of the power amplifier. The selected fan selects a brand with long service life and low noise under the condition of meeting the ventilation and heat dissipation.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.