CN107367717B - Radar multi-target intermediate frequency simulation device - Google Patents
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- CN107367717B CN107367717B CN201710867737.7A CN201710867737A CN107367717B CN 107367717 B CN107367717 B CN 107367717B CN 201710867737 A CN201710867737 A CN 201710867737A CN 107367717 B CN107367717 B CN 107367717B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
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Abstract
A radar multi-target intermediate frequency simulation device comprises: the device comprises a control module, an intermediate frequency transmitting module, a simulation signal module, a noise and clutter module and a channel power dividing module; the control module provides parameter control; the intermediate frequency transmitting module generates an intermediate frequency signal and a deception pulse signal according to the waveform type and the deception frequency; the simulation signal module simultaneously generates a plurality of intermediate frequency simulation signals of specific size, distance and speed targets according to the number of simulation targets, Doppler and reflection area of each target; the noise and clutter module generates specific noise and clutter signals according to the statistical characteristics, power and bandwidth of the noise and clutter signals; the channel power dividing module combines the intermediate frequency simulation signal and the noise and clutter signals, and then performs gain control after power division into multiple paths to form a multi-channel simulation signal. The simulation of radar simultaneous multi-target echo signals and the simulation of various radar noises and clutters are realized, the circuit is simple, the integration is easy, the universality is high, and the radar system can be widely applied.
Description
Technical Field
The invention relates to the technical field of radar target intermediate frequency simulation, in particular to a radar multi-target intermediate frequency simulation device.
Background
At present, since radars have been widely used in civil fields such as navigation, mapping, and weather from the first military field, high-performance and multifunctional new-system radars have been the subject of research and development in various countries. In the process of radar development and production, the testing links of radar performance and indexes are indispensable, if only relying on the traditional external field test method, namely adopting real targets such as airplanes or missiles and the like to provide echo signals for the radar, not only financial resources, manpower and material resources are consumed, but also the flexibility is poor, the development cycle is long, the influence of weather conditions is easy, and the measurement process becomes complicated and difficult. At the same time, in order to measure certain specific properties of the radar signal, complex external conditions need to be provided, which are difficult to meet in a test environment. The radar target intermediate frequency simulation device adopting the simulation technology and the digital-analog mixed circuit technology can replace a real target to provide an intermediate frequency echo signal for the radar, has the advantages of economy, convenience, repeatability and the like, and can conveniently solve a plurality of problems in the radar performance index testing and evaluating process.
The traditional radar Doppler intermediate frequency simulation target generation technology mainly adopts an analog coherent circuit technology. The circuit is complex, the generation of intermediate frequency simulation signals of a plurality of radar targets can not be realized, the simulation performance of the system is greatly limited, the reverse breakdown of a PN junction of a diode is generally adopted, noise and clutter signals are generated by amplifying and filtering the signals generated by the breakdown, the statistical characteristic of the noise and the clutter signals generated by the method is single, the stability is poor, the noise and the clutter signals are easily influenced by environmental factors such as temperature, and the problem that the circuit is easy to self-excite exists due to the fact that the amplification factor is too large.
Disclosure of Invention
The application provides a radar multi-target intermediate frequency simulation device which comprises a control module, an intermediate frequency transmitting module, a simulation signal module, a noise and clutter module and a channel power dividing module;
the control module executes a data command and a time sequence signal for receiving the radar system, and generates control signals and configuration data of the intermediate frequency transmitting module, the simulation signal module, the noise and clutter module and the channel power dividing module under the coordination of the data command and the time sequence signal;
the intermediate frequency transmitting module executes the generation of an intermediate frequency signal and a deception pulse signal according to a transmitting excitation time sequence signal provided by the control module, wherein the intermediate frequency signal is divided into three paths, two paths of the intermediate frequency signal are transmitted to the simulation signal module, and the other path of the intermediate frequency signal and the deception pulse signal generate an intermediate frequency excitation signal used by a radar transmitting link;
the simulation signal module executes intermediate frequency simulation signals which simultaneously generate a plurality of targets with specific sizes, distances and speeds according to the number of the simulation targets, Doppler and reflection areas of each target;
the noise and clutter module executes the generation of specific noise and clutter signals according to the probability distribution, spectrum characteristics, power and bandwidth parameters of the noise and clutter signals provided by the control module;
and combining the intermediate-frequency simulation signal, the noise and the clutter signal into one path by channel power division execution, and then dividing the power into multiple paths to form a multi-channel simulation signal.
In one embodiment, the if transmitter module includes a DDS chip, and the if transmitter module executes the following procedures to generate the if excitation signal:
controlling a DDS chip to generate an intermediate frequency signal and a deception pulse signal according to the control module;
separating the intermediate frequency signal and the deception pulse signal through a gating switch;
carrying out low-pass filtering and amplification on the deception pulse signal in a broadband manner;
performing narrow-band-pass filtering and amplification on the intermediate-frequency signal, dividing the intermediate-frequency signal after filtering into three paths, and synthesizing one path of intermediate-frequency signal and the deceptive pulse signal after filtering into one path through a gating switch to form a combined signal; .
In one embodiment, the simulation signal module includes a DDS chip, and the simulation signal module executes the following procedures to generate the intermediate frequency simulation signals of the plurality of targets:
controlling a DDS chip to generate a first continuous wave signal and a second continuous wave signal according to the control module;
mixing, filtering and amplifying the first continuous wave signal and one intermediate frequency signal provided by the intermediate frequency transmitting module to obtain a first mixed signal;
mixing and filtering the first mixing signal and the second continuous wave signal to obtain a moving target simulation signal;
and synthesizing the moving target simulation signal and the other path of intermediate frequency signal provided by the intermediate frequency transmitting module into one path through a gating switch to form intermediate frequency simulation signals of the multiple targets.
In one embodiment, the simulation signal module further comprises a DAC chip, and the DAC chip is controlled by the control module to generate the intermediate frequency simulation signals of the plurality of targets.
In one embodiment, the control module includes an FPGA chip and integrates a CAN bus and an RS422 bus.
According to the radar multi-target intermediate frequency simulation device of the embodiment, the simultaneous generation of the intermediate frequency simulation signals of a plurality of radar targets can be realized, the parameters such as the probability distribution, the frequency spectrum characteristic, the power and the bandwidth of noise and clutter signals can be flexibly changed, the scene that the echoes of the plurality of target radars are mutually overlapped is simulated, in addition, the intermediate frequency transmitting module is integrated in the device, so that the device has the functions of generating intermediate frequency transmitting excitation, deception pulse signals, intermediate frequency simulation signals, noise and clutter signals and the like, and the radar multi-target intermediate frequency simulation device has the advantages of simple circuit, easiness in integration, strong functions, strong universality and capability of being widely applied to radar systems.
Drawings
FIG. 1 is a schematic diagram of a radar multi-target intermediate frequency simulation device;
FIG. 2 is a schematic diagram of moving target simulation signal generation.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
The present embodiment provides a radar multi-target intermediate frequency simulation apparatus, whose schematic diagram is shown in fig. 1, and includes a control module, an intermediate frequency transmitting module, a simulation signal module, a noise and clutter module, and a channel power division module.
The control module of the embodiment adopts an FPGA chip and integrates a CAN bus and an RS422 bus, a coherent clock provided by the system is used, a data command of the radar system is received through the CAN bus, a time sequence signal of the radar system is received through the RS422 bus, under the coordination of the data command and the time sequence signal, control signals and configuration data of the intermediate frequency transmitting module, the simulation signal module, the noise and clutter module and the channel power dividing module are generated, meanwhile, the control data written into the intermediate frequency transmitting module and the simulation signal module are read back and verified, the configuration data of each simulation period are ensured to be real and effective, the reliability of the simulation device is improved, and finally, the fault information of the device is fed back to the radar system through the CAN bus.
The intermediate frequency transmitting module executes the generation of an intermediate frequency signal and a spoofed pulse signal according to the transmitting excitation time sequence signal provided by the control module, namely, the intermediate frequency transmitting module generates the intermediate frequency signal and the spoofed pulse signal of the required types under the excitation of the transmitting synchronous signal according to the waveform and the spoofed pulse type, as can be known from fig. 1, the intermediate frequency signal is divided into three paths, wherein the two paths are transmitted to the simulation signal module, and the other path and the spoofed pulse signal generate the intermediate frequency excitation signal for the radar transmitting link.
Specifically, the intermediate frequency transmitting module adopts a DDS chip, uses a coherent clock provided by the system, and executes the following procedures to generate an intermediate frequency excitation signal:
the DDS chip is matched with information such as waveform type, deception frequency and the like provided by the control module, and generates an intermediate frequency signal and a deception pulse signal under the triggering of a transmitting excitation time sequence signal provided by the control module;
separating the intermediate frequency signal and the deception pulse signal through a gating switch;
carrying out low-pass filtering and amplification on the deception pulse signal in a broadband manner;
performing narrow-band-pass filtering and amplification on the intermediate frequency signal, dividing the intermediate frequency signal after filtering into three paths, synthesizing one path of intermediate frequency signal and the deceptive pulse signal after filtering into one path through a gating switch to form a combined signal, and transmitting the other two paths of intermediate frequency signals to a simulation signal module;
and amplifying the combined signal, and generating an intermediate frequency excitation signal through a gating switch.
The filter can be an LC filter, a sound meter filter, an LTCC filter and the like, the broadband low-pass filter requires a wide frequency range, the narrowband band-pass filter requires a good rectangular coefficient, and high-quality intermediate frequency excitation signals and deception pulse signals in a wide frequency range are generated.
The simulation signal module of the embodiment generates intermediate frequency simulation signals according to the number of simulation targets, Doppler and reflection area of each target, which are provided by the control module, of two paths of intermediate frequency signals transmitted by the intermediate frequency transmitting module, and generates a plurality of intermediate frequency simulation signals of targets with specific size, distance and speed under the excitation of simulation synchronous signals; specifically, the simulation signal module includes a DDS chip and a DAC chip, and realizes simultaneous generation of a plurality of radar target intermediate frequency simulation signals, wherein the DDS chip generates a moving target simulation signal by using a mixing scheme, and further generates an intermediate frequency simulation signal, a program schematic diagram of the operation of the DDS chip is shown in fig. 2, and the specific process is as follows:
simulated target Doppler f provided by matching with control moduledWhen the information is equal, the control module controls a DDS chip in the simulation signal module to generate a first continuous wave signal sinf2t and a second continuous wave signal sin (f)2+fd)t；
The first path of continuous wave signal sinf is processed2t and one path of intermediate frequency signal sinf provided by intermediate frequency transmitting module1t is mixed, filtered and amplified to obtain a first mixed signal cos (f)2-f1)t；
Mixing the first mixing signal cos (f)2-f1) t and a second continuous wave signal sin (f)2+fd) t is mixed and filtered to obtain a moving target simulation signal sin (f)1+fd)t；
Moving target simulation signal sin (f) through gating switch1+fd) t and the other path of intermediate frequency signal provided by the intermediate frequency transmitting module are synthesized into one path to form an intermediate frequency simulation signal.
Wherein, in order to ensure the normal operation of the above scheme, f1And f2Is sufficiently large and both frequencies are much larger than the doppler frequency fd。
The DAC chip framework adopts a software radio mode, utilizes the characteristic of high flexibility of the DAC chip, generates a plurality of target intermediate frequency simulation signals by the DAC chip, and outputs the signals after filtering and gain control. The simulation signal module utilizes the characteristics of low phase noise and small in-band amplitude fluctuation of a DDS chip and also utilizes the characteristics of high flexibility of a DAC chip to generate simulation signals with high quality, multiple types and good performance, so that the simultaneous generation of the intermediate-frequency simulation signals of multiple radar targets is realized, and the scene of mutual superposition of echoes of the multiple target radars is simulated.
The noise and clutter module of the embodiment adopts a DAC chip, matches with the noise and clutter signal probability distribution, frequency spectrum characteristic, power and bandwidth and other parameters provided by the control module, adopts a software infinite electric mode and a related algorithm, utilizes the characteristic of high flexibility of the DAC chip, generates the required noise and clutter signal by the DAC chip, and outputs the noise and clutter signal after filtering and gain control. The noise and clutter signals generated by the method are various in types, high in stability, less influenced by environmental factors such as temperature and the like, and free of the problems of circuit self-excitation and the like.
The channel power dividing module combines the intermediate frequency simulation signal provided by the simulation signal module and the noise and clutter signal provided by the noise and clutter module into one channel, then performs gain control after power dividing into multiple channels respectively to form simulation signals with more channels, and performs isolation and amplification on the simulation signal of each channel by using an amplifier with high isolation, thereby realizing high isolation in the front and at the back of the channel, reducing reflection of the simulation signals and improving authenticity of the simulation signals. For a radar system, the channels may be divided into a sum channel, an azimuth difference channel, a pitch difference channel, an auxiliary channel, and the like. It should be understood that the number of simulation channels is not limited in the present invention, and may be three, four or more.
The working process of the embodiment of the present invention is further described below:
the control module receives a data command and a time sequence signal of the radar system, provides parameter control for the intermediate frequency transmitting module, the simulation signal module, the noise and clutter module and the channel power dividing module, and simultaneously reports fault information of the device to the radar system; the intermediate frequency transmitting module generates an intermediate frequency transmitting signal and a deception pulse signal of a required type to be used by a radar transmitting link under the excitation of a transmitting synchronous signal according to the waveform and the deception pulse type; the simulation signal module generates a plurality of target intermediate frequency simulation signals with specific size, distance and speed by utilizing a DDS chip and a DAC chip under the excitation of simulation synchronous signals according to the waveform type, the number of simulation targets and Doppler and reflection areas of each target; the noise and clutter module generates specific noise and clutter signals in a software radio mode by applying a correlation algorithm according to the setting of parameters such as statistical characteristics, power and bandwidth of the noise and clutter signals; the channel power dividing module combines the intermediate frequency simulation signals, the noise and the clutter signals, then the power is divided into multiple paths, gain control is respectively carried out, the simulation signals of multiple channels are formed and used for a radar receiving link, the generation of the intermediate frequency simulation signals of multiple radar targets is realized, the scene of mutual superposition of multiple target radar echoes is simulated, and the rapid verification of the radar detection capability and the tracking algorithm performance is realized.
Therefore, the radar multi-target intermediate frequency simulation device is composed of a control module, an intermediate frequency transmitting module, a simulation signal module, a noise and clutter module and a channel power dividing module, realizes the simulation of radar simultaneous multi-target echo signals, the simulation of various radar noises and clutter, realizes the rapid verification of radar detection capability and tracking algorithm performance, has simple circuit, easy integration, powerful functions and strong universality, and can be widely applied to radar systems.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (4)
1. A radar multi-target intermediate frequency simulation device is characterized by comprising: the device comprises a control module, an intermediate frequency transmitting module, a simulation signal module, a noise and clutter module and a channel power dividing module;
the control module executes a data command and a time sequence signal for receiving a radar system, and generates control signals and configuration data of the intermediate frequency transmitting module, the simulation signal module, the noise and clutter module and the channel power dividing module under the coordination of the data command and the time sequence signal;
the intermediate frequency transmitting module executes the generation of an intermediate frequency signal and a deception pulse signal according to a transmitting excitation time sequence signal provided by the control module, wherein the intermediate frequency signal is divided into three paths, two paths of signals are transmitted to the simulation signal module, and the other path of signals and the deception pulse signal generate an intermediate frequency excitation signal used by a radar transmitting link;
the simulation signal module executes intermediate frequency simulation signals which simultaneously generate a plurality of targets with specific sizes, distances and speeds according to the number of simulation targets, Doppler and reflection areas of each target; specifically, the simulation signal module includes a DDS chip, and the simulation signal module executes the following program to generate the intermediate frequency simulation signals of the plurality of targets:
controlling a DDS chip to generate a first continuous wave signal sin f according to the control module2t and a second continuous wave signal sin (f)2+fd)t；
The first continuous wave signal sin f2t and one path of intermediate frequency signal sin f provided by the intermediate frequency transmitting module1t is mixed, filtered and amplified to obtain a first mixed signal cos (f)2-f1)t；
Mixing the first mixing signal cos (f)2-f1) t and a second continuous wave signal sin (f)2+fd) t is mixed and filtered to obtain a moving target simulation signal sin (f)1+fd)t；
Moving target simulation signal sin (f) through gating switch1+fd) t and the other path of intermediate frequency signal provided by the intermediate frequency transmitting module are combined into one path to form intermediate frequency simulation signals of the multiple targets;
the noise and clutter module executes specific noise and clutter signals generated according to the probability distribution, the frequency spectrum characteristic, the power and the bandwidth parameters of the noise and clutter signals provided by the control module;
the channel power dividing module combines the intermediate frequency simulation signal, the noise and the clutter signal into one path, and then power divides the path into multiple paths to form a multi-channel simulation signal.
2. The radar multi-target intermediate frequency simulation apparatus according to claim 1, wherein the intermediate frequency transmission module includes a DDS chip, and the intermediate frequency transmission module executes the following procedures to generate the intermediate frequency excitation signal:
controlling a DDS chip to generate an intermediate frequency signal and a deception pulse signal according to the control module;
separating the intermediate frequency signal and the deception pulse signal through a gating switch;
carrying out low-pass filtering and amplification on the deception pulse signal in a broadband manner;
performing narrow-band-pass filtering and amplification on the intermediate-frequency signal, dividing the intermediate-frequency signal after filtering into three paths, and synthesizing one path of intermediate-frequency signal and the deceptive pulse signal after filtering into one path through a gating switch to form a combined signal;
and amplifying the combined signal, and generating the intermediate frequency excitation signal through a gating switch.
3. The radar multi-target intermediate frequency simulation apparatus according to claim 1, wherein the simulation signal module further includes a DAC chip, and the DAC chip is controlled by the control module to generate the intermediate frequency simulation signals of the plurality of targets.
4. The radar multi-target intermediate frequency simulation device according to claim 1, wherein the control module comprises an FPGA chip and integrates a CAN bus and an RS422 bus.
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| CN107340505A (en) * | 2017-07-02 | 2017-11-10 | 中国航空工业集团公司雷华电子技术研究所 | The generation structure and method of a kind of radar signal |
| CN109001697B (en) * | 2018-08-14 | 2022-11-04 | 电子科技大学 | Multi-target radar echo simulator |
| CN109557516B (en) * | 2018-11-28 | 2022-08-30 | 四川九洲电器集团有限责任公司 | Method for quickly generating multi-target space signals |
| CN109462416B (en) * | 2018-12-19 | 2021-04-20 | 贵州航天电子科技有限公司 | Intermediate frequency receiver based on single-channel target information extraction |
| CN110208768A (en) * | 2019-06-27 | 2019-09-06 | 哈尔滨工业大学 | The phased-array radar real-time multi-target analogue echoes method of super parallel autonomous production |
| CN113391280B (en) * | 2021-06-15 | 2022-10-18 | 中国电子科技集团公司第二十九研究所 | Radar signal processor debugging method, equipment and medium based on FPGA |
| CN113945893A (en) * | 2021-12-20 | 2022-01-18 | 清华大学 | Radar clutter signal simulation device and method |
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