CN216434357U - Radar transmitter performance parameter test training system - Google Patents

Abstract

The utility model provides a radar transmitter performance parameter test training system, include: the device comprises a DDS signal generating module, a frequency mixing filtering module, an excitation amplifying and power distributing module and a power amplifying and power synthesizing module; the DDS signal generating module is used for generating an intermediate frequency signal; the frequency mixing filtering module is used for carrying out secondary frequency mixing and two-stage filtering on the intermediate frequency signal to obtain an excitation signal; the excitation amplification and power distribution module is used for amplifying the excitation signals and distributing the power of the amplified excitation signals to obtain a plurality of paths of excitation signals; the power amplification and power synthesis module is used for amplifying the multi-channel excitation signals sent by the excitation amplification and power distribution module and carrying out power synthesis on the amplified multi-channel excitation signals to obtain radar transmitting signals. The utility model discloses can effectively simulate typical radar transmitter work flow, provide corresponding test signal for transmitter performance parameter test training, solve the reality difficulty of radar transmitter performance parameter test training.

Description

Radar transmitter performance parameter test training system

[ technical field ] A

The utility model belongs to the technical field of radar performance parameter measurement and simulation training emulation, more specifically relates to a radar transmitter performance parameter test training system.

[ background of the invention ]

In the current information era, the weather forecast can better cope with extreme weather in time and accurately, precaution is well done in advance, and the air traffic control with high precision and high efficiency ensures that air travel is safer and more convenient. The information service technologies supporting modern weather forecast, air traffic control and the like are huge radar devices operated in weather stations and air traffic control stations in various regions of the world. The radar equipment becomes an important detection means for acquiring information in modern society, is providing indispensable information service for the modern society and plays an increasingly important role in daily life.

Because each technical index of the radar equipment can change along with the use time, the reduction of the technical index can directly influence the overall detection performance of the radar, and even cause the fault of the radar equipment. Therefore, the main performance parameters of the radar equipment must be measured periodically so as to know the main technical indexes of the radar in time and grasp the technical states of the subsystems of the radar.

In the daily guarantee work of radar equipment, in order to master the technical state of a radar transmitting subsystem in time, technical support personnel are required to master the test method of performance parameters such as radar transmitting power, working frequency, transmitting pulse repetition frequency, transmitting pulse envelope parameters, transmitting pulse frequency spectrum (signal bandwidth, signal-to-noise ratio and the like), improvement factor of a transmitter to an improvement factor transmitter, and the like, and can use an attached instrument of the radar to carry out corresponding test work. However, due to the lack of a matching training platform for performance parameter testing, most of the personnel lack of targeted training, so that the measurement method is not firmly mastered and the testing skill is not strong, and the problem of practical testing by using an attached radar instrument is difficult to solve skillfully. Meanwhile, lack of targeted parameter testing training also brings serious potential safety hazards to actual radar testing work.

[ Utility model ] content

The utility model discloses an actual demand to radar transmitter performance parameter test training provides a radar transmitter performance parameter test training system, but through this measurement training system greatly reduced radar equipment loss, assurance training safety, improvement training benefit, promotes technical support personnel's test ability, has higher use value.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a radar transmitter performance parameter test training system, which comprises a DDS (Direct Digital Synthesis) signal generation module, a mixing filter module, an excitation amplification and power distribution module and a power amplification and power Synthesis module;

the DDS signal generation module is used for generating an intermediate frequency signal; the frequency mixing and filtering module is used for carrying out secondary frequency mixing and two-stage filtering on the intermediate frequency signal to obtain an excitation signal; the excitation amplification and power distribution module is used for amplifying the excitation signals and distributing the power of the amplified excitation signals to obtain a plurality of paths of excitation signals; the power amplification and power synthesis module is used for amplifying the multi-channel excitation signals sent by the excitation amplification and power distribution module and carrying out power synthesis on the amplified excitation signals to obtain radar transmitting signals.

The utility model discloses can effectively simulate typical radar transmitter work flow, provide corresponding test signal for transmitter performance parameter test training, solve the reality difficulty of radar transmitter performance parameter test training.

Compared with the prior art, the utility model discloses following beneficial effect has:

(1) the design is carried out according to the functional composition of a typical radar transmitter and the main signal flow of the system, the testing content of the performance parameters is wide, and the project is complete. The system truly simulates the functional composition of a typical all-solid-state radar transmitter, completely reflects the main signal transmitting flow of the radar, reserves a measuring port on a main link, is used for carrying out the measurement training of parameters such as radar transmitting power, working frequency, transmitting pulse repetition frequency, transmitting pulse envelope parameters, transmitting pulse frequency spectrum (signal bandwidth, signal-to-noise ratio and the like), improvement factor limitation of the transmitter to the improvement factor and the like, and has wide content and complete projects;

(2) by adopting a measuring port design form based on the radar system principle, the basic principle of parameter measurement is better understood, and the method steps are easier to master. The utility model discloses a semi-physical training platform who designs is carried out according to the system principle of typical radar adopts the test port design based on radar system principle, prints radar transmission main signal flow and schematic diagram on hardware platform panel, directly and clearly marks the signal on reserving the measurement port, does benefit to the personnel of visiting and knows the physical meaning of parameter item, understands the fundamental principle of parameter measurement, masters measuring method, fast generation test skill;

(3) the performance parameter test training is carried out by adopting semi-physical simulation, so that the training space is effectively expanded, and the training is safer and more efficient. The utility model discloses a semi-physical training platform according to full solid-state system radar design carries out performance parameter test training through this system, can effectively expand test training space on the one hand, solves the reality difficulty that the real dress measurement training is few to many people, radar shelter space is narrow and small, improves the training benefit; on the other hand, the abrasion of parts caused by repeatedly plugging and unplugging the radar interface during actual assembly measurement can be reduced, the safety risk brought by high-power measurement on a radar transmitter can be effectively reduced, and the training safety is ensured;

(4) in addition, the system hardware adopts a modular design, thereby greatly reducing the complexity of engineering realization, improving the system reliability and cost performance, and having obvious economic benefit and good popularization and application value. On one hand, the abrasion of the radar equipment caused by traditional test training can be greatly reduced, and the safety of performance parameter test training is ensured; on the other hand, the contradiction between the long-term duty of the radar equipment and the test training can be effectively solved through batch production, and the training benefit is improved.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.

Fig. 1 is a block diagram of a system for testing and training performance parameters of a radar transmitter according to an embodiment of the present invention;

fig. 2 is a schematic block diagram of a system for testing and training performance parameters of a radar transmitter according to an embodiment of the present invention;

fig. 3 is the embodiment of the utility model provides a measurement port schematic diagram of radar transmitter performance parameter test training system.

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The present invention will be described in detail with reference to the accompanying drawings and examples.

The utility model provides a radar transmitter performance parameter test training system (hereinafter for short test training system), through this test training can develop radar transmitter main performance parameter's test training, effectively solve the reality difficulty of solving radar transmitter performance parameter test training, guarantee training safety, improve the training benefit.

As shown in fig. 1, the system for testing and training performance parameters of a radar transmitter is used for simulating a typical radar transmitter, and mainly includes a DDS signal generating module, a frequency mixing filtering module, an excitation amplifying and power distributing module, and a power amplifying and power synthesizing module, wherein:

the DDS signal generation module is used for generating an intermediate frequency signal;

the frequency mixing and filtering module is used for carrying out secondary frequency mixing and two-stage filtering on the intermediate frequency signal to obtain an excitation signal;

the excitation amplification and power distribution module is used for amplifying the excitation signals and distributing the power of the amplified excitation signals to obtain a plurality of paths of excitation signals;

the power amplification and power synthesis module is used for amplifying the multi-channel excitation signals sent by the excitation amplification and power distribution module and carrying out power synthesis on the amplified excitation signals to obtain radar transmitting signals.

The following describes each component of the test training system in detail with reference to fig. 1 and 2:

first, an intermediate frequency signal is directly generated using a direct digital frequency synthesis (DDS) technique. And then, carrying out secondary frequency mixing and two-stage filtering on the intermediate frequency signal by using a frequency mixing filtering module to obtain an excitation signal. Then, amplifying the excitation signal by using an excitation amplification and power distribution module, and performing power distribution on the amplified excitation signal to obtain 4 paths of excitation signals; secondly, amplifying the 4 paths of excitation signals sent by the power amplification and power distribution module, and obtaining radar transmitting signals (namely transmitter output signals) after power synthesis; and finally, extracting the intermediate frequency signal, the local oscillator signal, the up-conversion signal, the excitation signal and the transmitter output signal on the transmitting signal path through the directional coupler, and leading the signals to a platform panel to be used as a test port for carrying out transmitting performance parameter test training.

The method comprises the following concrete steps:

(1) a transmission signal generation path is constructed in accordance with the basic composition of a typical solid-state radar transmitter.

The transmit signal generation path is constructed around the signal flow of "DDS signal generation → two up-conversions → filtering amplification → excitation amplification → power distribution → multi-path power amplification → power synthesis → transmit power output", and the schematic block diagram is shown in fig. 2. In the figure, the main functions of each functional module are as follows:

[ DDS Signal Generation ": for generating an intermediate frequency signal with an adjustable period and a variable pulse width.

② first up-conversion and second up-conversion: the method is used for realizing the up-conversion of the intermediate frequency signal twice to obtain an excitation signal.

③ first local oscillator and second local oscillator: local oscillation signals required by frequency mixing are respectively provided for the first frequency mixing module and the second frequency mixing module.

Fourthly, the first filtering amplification and the second filtering amplification: used for filtering and amplifying the output signals of the first and second mixing modules respectively.

"excitation amplification": the power amplifier is used for carrying out primary amplification on the mixed excitation signal so as to meet the power requirement of subsequent multi-path power amplification on the input end signal.

Sixthly, power distribution: the power of the single excitation signal is distributed into multiple paths.

Seventhly, multipath power amplification: for achieving high gain amplification of the excitation signal.

'power synthesis': the power synthesis method is used for realizing power synthesis of the multipath power amplification output signals.

Ninthly 'transmission power output': for transmission power output, and for measurement of incident and reflected signal power.

Further, as shown in fig. 1 and 2, the frequency mixing filtering module includes a first local oscillator module, a first up-conversion module, a first filtering amplification module, a second local oscillator module, a second up-conversion module, and a second filtering amplification module, where:

the first local oscillator module is configured to provide a local oscillator signal for the first up-conversion module;

the first up-conversion module is used for realizing up-conversion of the intermediate frequency signal;

the first filtering and amplifying module is used for filtering and amplifying the signal output by the first up-conversion module, filtering out the unnecessary frequency component and amplifying the required frequency component;

the second local oscillator module is configured to provide a local oscillator signal for the second up-conversion module;

the second up-conversion module is used for realizing up-conversion of the output signal of the first filtering amplification module;

and the second filtering and amplifying module is used for filtering and amplifying the signal output by the second up-conversion module, filtering out the unnecessary frequency component and amplifying the required frequency component.

Further, as shown in fig. 1 and 2, the excitation amplifying and power distributing module includes an excitation amplifying module and a power distributing module, wherein:

the excitation amplifying module is used for amplifying the excitation signal sent by the frequency mixing filtering module;

and the power distribution module is used for distributing the input excitation signal into 4 paths.

The power amplification and power synthesis module comprises a multi-path power amplification module and a power synthesis module, wherein:

further, as shown in fig. 1 and 2, the multi-path power amplification module includes a plurality of power amplification units, and each power amplification unit receives and amplifies one path of excitation signal distributed by the power distribution module;

and the power synthesis module is used for synthesizing the excitation signals output by the multipath power amplification unit to obtain radar emission signals.

(2) And determining a transmission performance parameter test item according to the test requirements of the typical solid-state transmitter.

According to the performance test requirements of a typical radar transmitter, the test requirements of radar equipment guarantee are combined, and the test items of the transmitting performance parameters are determined, wherein the test items comprise the test parameters of the output end of the transmitter, the test parameters of a local oscillator module and the test parameters of a transmitting signal branch circuit. The transmitter output port test parameters refer to parameter items tested through the transmitter output port, and specifically include radar transmission power, working frequency, transmission pulse repetition frequency, transmission pulse envelope parameters, transmission pulse frequency spectrum (signal bandwidth, signal-to-noise ratio and the like), limitation of the transmitter on improvement factors and the like. The local oscillator module test parameters refer to parameter items tested through the first local oscillator output port and the second local oscillator output port, and specifically include the frequency, the power intensity, the clutter suppression degree and the stability of the first local oscillator signal and the second local oscillator signal. The test parameters of the transmitting signal branch refer to the parameter items tested on each port of the transmitting branch (from the generation of the DDS signal to the mixing filtering, then to the excitation amplification, the power distribution, the power amplification and the multi-path synthesis of the whole signal branch), and specifically include the DDS output signal, the excitation output power, the input power of the power amplifier module, the output power of the power amplifier module and the like.

(3) The transmission signal generating channel test signal is led to the platform panel through the directional coupler.

And reserving a corresponding test port on a transmission signal generation path according to the determined transmission performance parameter test items, and leading the test port to the platform panel through the directional coupler. The schematic diagram of the measurement port of the transmission performance parameter test training hardware platform is shown in fig. 3. Through the ports, the testing of the transmitter output power, the working frequency, the radio frequency pulse frequency spectrum, the radio frequency pulse waveform parameters, the transmitter on the transmitter main performance parameters such as the limitation of the improvement factor and the like can be finished, and the testing of the working frequency, the power intensity, the clutter suppression degree, the stability, the transmitting branch signal power and other parameters of the local oscillation signal can also be finished. In the figure, the ports outside the dotted line frame are signal ports reserved for conducting tests. The measurement ports are specified as follows:

[ synchronization trigger': synchronizing trigger signal measurement ports. When measuring the 'emission pulse envelope' or 'synthesized output end power', the method can be used as an oscilloscope or a power meter external trigger signal.

② DDS is out: DDS intermediate frequency signal measurement port.

③ local oscillator 1 and local oscillator 2: the first and second local oscillator signal measurement ports. The measurement of parameters such as local oscillation signal frequency, power intensity, clutter suppression degree, stability and the like can be completed through the two ports.

Fourthly, performing up-conversion 1 and up-conversion 2: the first and the second up-conversion output signal measuring ports. The measurement of parameters such as frequency, power intensity and the like of the up-conversion output signal can be completed through the two ports.

Fifthly, performing up-conversion 2: up-convert 2 input signal measurement port.

Sixthly, excitation amplification is as follows: the output power measurement port is energized.

Seventhly, putting a power amplifier 1 in, putting a power amplifier 2 in, putting a power amplifier 3 in and putting a power amplifier 4 in: corresponding to the input power measuring ports of the modules of the power amplifier 1, the power amplifier 2, the power amplifier 3, the power amplifier 4 and the like.

'power amplifier 1 out', 'power amplifier 2 out', 'power amplifier 3 out' and 'power amplifier 4 out': corresponding to the output power measuring ports of the modules of the power amplifier 1, the power amplifier 2, the power amplifier 3, the power amplifier 4 and the like.

Ninthly, "forward coupling", "reverse coupling": the incident and reflected power are coupled out of the measurement port.

The "transmit signal out" in the r: and a transmitter output power measuring terminal.

The embodiment of the utility model provides an among the above-mentioned test training system that provides, hardware system has integrateed DDS signal production module, mixing filter module, excitation and has enlargied and power distribution module, power amplification and power synthesis module isotructure, can effectively simulate typical radar transmitter work flow, for transmitter performance parameter test training provides corresponding test signal, solves the reality difficulty of radar transmitter performance parameter test training.

It will be understood by those skilled in the art that the foregoing is merely exemplary of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims (7)

1. The system for testing and training the performance parameters of the radar transmitter is characterized by comprising a DDS signal generation module, a mixing filtering module, an excitation amplification and power distribution module and a power amplification and power synthesis module, wherein:

the DDS signal generation module is used for generating an intermediate frequency signal;

the frequency mixing and filtering module is used for carrying out secondary frequency mixing and two-stage filtering on the intermediate frequency signal to obtain an excitation signal;

the excitation amplification and power distribution module is used for amplifying the excitation signals and distributing the power of the amplified excitation signals to obtain a plurality of paths of excitation signals;

the power amplification and power synthesis module is used for amplifying the multi-channel excitation signals sent by the excitation amplification and power distribution module and carrying out power synthesis on the amplified multi-channel excitation signals to obtain radar transmitting signals.

2. The radar transmitter performance parameter testing training system of claim 1, wherein the DDS signal generating module directly generates the intermediate frequency signal using a direct digital frequency synthesis technique.

3. The radar transmitter performance parameter test training system according to claim 1 or 2, wherein the intermediate frequency signal is adjustable in period and variable in pulse width.

4. The system for testing and training performance parameters of radar transmitters as claimed in claim 1 or 2, wherein the excitation amplifying and power distributing module distributes the power of the excitation signal to obtain 4 excitation signals.

5. The radar transmitter performance parameter test training system according to claim 1 or 2, wherein the mixing filtering module comprises a first local oscillation module, a first up-conversion module, a first filtering amplification module, a second local oscillation module, a second up-conversion module, and a second filtering amplification module, wherein:

the first local oscillator module is configured to provide a local oscillator signal for the first up-conversion module;

the first up-conversion module is used for realizing up-conversion of the intermediate frequency signal;

the first filtering and amplifying module is used for filtering and amplifying the signal output by the first up-conversion module, filtering out the unnecessary frequency component and amplifying the required frequency component;

the second local oscillator module is configured to provide a local oscillator signal for the second up-conversion module;

the second up-conversion module is used for realizing up-conversion of the output signal of the first filtering amplification module;

and the filtering and amplifying module is used for filtering and amplifying the signal output by the second up-conversion module, filtering out the unnecessary frequency component and amplifying the required frequency component.

6. The radar transmitter performance parameter test training system of claim 1 or 2, wherein the excitation amplification and power distribution module comprises an excitation amplification module and a power distribution module, wherein:

the excitation amplifying module is used for amplifying the excitation signal sent by the frequency mixing filtering module;

and the power distribution module is used for distributing the input excitation signal into 4 paths.

7. The radar transmitter performance parameter test training system of claim 1 or 2, wherein the power amplification and power combining module comprises a multipath power amplification module and a power combining module, wherein:

the multi-path power amplification module comprises a plurality of paths of power amplification units, and each path of power amplification unit receives and amplifies one path of excitation signal distributed by the power distribution module;

and the power synthesis module is used for synthesizing the excitation signals output by the multipath power amplification unit to obtain radar emission signals.

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