CN216595484U - Automobile radar target simulator - Google Patents
Automobile radar target simulator Download PDFInfo
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- CN216595484U CN216595484U CN202123272453.4U CN202123272453U CN216595484U CN 216595484 U CN216595484 U CN 216595484U CN 202123272453 U CN202123272453 U CN 202123272453U CN 216595484 U CN216595484 U CN 216595484U
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Abstract
The utility model relates to an automobile radar target simulator. The digital radio frequency storage is realized through a digital processing single machine, the digital radio frequency storage is used as a signal information storage mode, the transmitting wave band of a 77G wave band transmitting component is switched by combining a switch array module, the real-time modulation simulation of multi-target distance, Doppler and RCS can be realized, the radio frequency storage with 1GHz instantaneous bandwidth can be realized, and the radio frequency storage device is suitable for the possible working bandwidth of 4GHz of an automobile radar; the transmitting signal is matched with the transmitting waveform of the automobile radar by adjusting the frequency source variable local oscillator, and the requirements of automatically adapting to automobile radar common waveforms such as FMCW, CW, FSK, MFSK and combinations thereof are met.
Description
Technical Field
The utility model relates to a radar target simulation ware field specifically is an automobile radar target simulation ware.
Background
The automotive radar generally mainly uses a millimeter wave radar, which has the characteristics of small volume, light weight and high spatial resolution. Compared with optical probes such as infrared, laser and television, the millimeter wave probe has strong capability of penetrating fog, smoke and dust, has the characteristics of all weather (except heavy rainy days) all day long, and is used as a main radar of automobiles. A set of test platform suitable for test and evaluation of the vehicle-mounted millimeter wave radar system, namely an automobile radar target simulator, is built according to the test principle and method of a common millimeter wave radar by combining the requirements of advanced assistant driving on the millimeter wave radar in the current market.
The automotive radar target simulator is a key component of a radio-frequency signal-in-loop simulation system of a millimeter-wave radar, and after receiving a radar signal through a radio-frequency antenna receiving end, time domain and frequency domain analysis is carried out on the electromagnetic wave signal by adopting distance-Fourier transform and speed-Fourier transform algorithms, and radar wave signal characteristics are analyzed.
And setting information of the speed and distance of a simulated target and the RCS (radar Cross section) value of a radar scattering Cross section according to interface parameters in upper computer control software, and performing delay control, Doppler frequency shift, signal gain and attenuation on radar waves received by a radar target simulator by using a radio frequency signal technology to realize the simulation of the speed, distance and RCS value of a radar target signal.
The existing radar target simulator mainly comprises a signal transmitting and receiving front end, a signal modulation module and a wave-absorbing dark box, and false targets are easily caused by the signal transmitting and receiving front end and structures in the radar dark box. The false target is not the target simulated by the radar target simulator, and the false target can be avoided only by abundant engineering experience and design and manufacturing process. Therefore, the prior art has the problem of poor applicability.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide an automotive radar target simulator to solve the problem of poor applicability of the prior art.
An automotive radar target simulator, the automotive radar target simulator comprising:
the simulator comprises an antenna assembly and a simulator host;
the antenna assembly comprises a 77G waveband receiving assembly and a plurality of 77G waveband transmitting assemblies, and the 77G waveband receiving assembly and the plurality of 77G waveband transmitting assemblies are arranged on a spherical screen system;
the simulator host includes: the system comprises a switch array module, a frequency source module and a digital processing single machine; the frequency source module is connected with each 77G waveband transmitting component and is used for adjusting the waveform of a transmitting signal to be matched with the transmitting waveform of an automobile radar;
77G wave band receiving assembly with the digital processing unit is connected, 77G wave band emission subassembly passes through the switch array module is connected the digital processing unit, the switch array module is used for switching 77G wave band emission subassembly's emission wave band.
In one embodiment, the digital processing unit comprises a high-speed ADC module, an FPGA signal processing module and a high-speed DAC module;
the high-speed ADC module is connected with the FPGA signal processing module;
and the high-speed DAC module is connected with the FPGA signal processing module.
In one embodiment, the high-speed ADC module comprises a dual-channel acquisition high-speed AD chip.
In one embodiment, the high-speed DAC module comprises a two-channel high-speed digital-to-analog conversion DA chip.
In one embodiment, the simulator host further comprises: a down conversion component and an up conversion component.
In one embodiment, the antennas in the antenna assembly are horn antennas.
According to the automobile radar target simulator, digital radio frequency storage is realized through a digital processing single machine, a digital form is used as a signal information storage mode, the transmitting wave band of a 77G wave band transmitting component is switched by combining a switch array module, multi-target distance, Doppler and RCS real-time modulation simulation can be realized, 1GHz instantaneous bandwidth radio frequency storage can be realized, and the automobile radar target simulator is suitable for the possible working bandwidth of 4GHz of an automobile radar; the method matches the transmitting signal with the transmitting waveform of the automobile radar by adjusting the frequency source variable local oscillator, and meets the requirements of automatically adapting to automobile radar common waveforms such as FMCW, CW, FSK, MFSK and combinations thereof.
Drawings
Fig. 1 is a schematic diagram of a system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the signal simulation process of the simulator of the present invention;
fig. 3 is a schematic diagram of a test performed by a radar simulator according to an embodiment of the present invention;
fig. 4 is a general block diagram of a simulator according to an embodiment of the present invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
In one embodiment, as shown in FIG. 1, there is provided a system diagram of an automotive radar target simulator, comprising:
an antenna assembly 100 and a simulator main body 200;
the antenna assembly comprises a 77G waveband receiving assembly 101 and a plurality of 77G waveband transmitting assemblies 102, wherein the 77G waveband receiving assembly 101 and the plurality of 77G waveband transmitting assemblies 102 are arranged on the spherical screen system;
the simulator host includes: a switch array module 201, a frequency source module 203 and a digital processing single machine 202; the frequency source module 203 is connected with each 77G waveband transmitting component 102, and the frequency source module 203 is used for adjusting the waveform of the transmitting signal to be matched with the transmitting waveform of the automobile radar;
77G band receiving module 101 is connected to digital processing unit 202, 77G band transmitting module 102 is connected to digital processing unit 202 through switch array module 201, and switch array module 201 is used to switch the transmitting band of 77G band transmitting module 102.
The simulator simulates the interaction and the propagation process of the automobile radar transmitting signal and a target, and comprises an amplitude modulation effect caused by the change of the RCS, the angle and the distance of the beam, a delay modulation effect caused by the change of the distance and a Doppler modulation effect caused by the change of the instantaneous speed of the target, a digital baseband echo signal is generated in real time, and the converted or radio frequency echo signal is radiated to an automobile radar receiver through an antenna.
The simulator works in a wireless radiation mode, the receiving and transmitting antennas work simultaneously, the receiving antenna collects automobile radar transmitting signals, characteristic parameters of the transmitting signals can be analyzed, high-speed ADC collection is carried out on the transmitting signals, distance and speed simulation is achieved through multi-target delay and Doppler modulation through high-speed digital signal processing, and generated microwave signals are radiated out through the transmitting antennas.
A schematic diagram of a simulator echo signal simulation process is shown in fig. 2, a schematic diagram of a test performed by using a radar simulator is shown in fig. 3, and the working principle and process of the simulator can be better explained through a signal time-frequency change process: the radar transmitting signal is changed into a radio frequency signal through a receiving antenna, the radio frequency signal is changed into a digital baseband transmitting signal through two-stage down conversion and ADC sampling, the signal is processed through a digital signal to modulate a plurality of target information in real time to generate, the radio frequency signal is changed into a radio frequency echo signal through DAC playing and two-stage up conversion, and finally the radio frequency echo signal is radiated to an automobile radar receiver through the transmitting antenna, and the process of the echo simulator is consistent with the actual working process of the automobile radar. In the process of modulating the target information, different targets at the same time have different amplitude, Doppler and delay modulation, and three delays τ are respectively illustrated in FIG. 21,τ2,τ3(corresponding to different target distances) and the Doppler modulation are respectively fd1,fd2,fd3(corresponding to different target speeds) targets, because the receiving and transmitting antenna of the simulator has a certain distance from the radar antenna of the automobile, and the simulator is introduced by the cable and digital signal processingClock delay, the system has the simulation lower limit of the shortest distance, such as tau in the figureminThen the shortest simulation distance is Rmin＝cτminAnd/2, c represents the propagation speed of light.
Compared with the prior art, the technical scheme of the utility model following beneficial effect has:
(1) the digital radio frequency storage is realized through the digital processing single machine, the digital form is used as a signal information storage mode, the transmitting wave band of the 77G wave band transmitting component is switched by combining the switch array module, the real-time modulation simulation of multi-target distance, Doppler and RCS can be realized, the radio frequency storage with the 1GHz instantaneous bandwidth can be realized, and the device is suitable for the possible working bandwidth of the automobile radar of 4 GHz.
(2) The transmitting signal is matched with the transmitting waveform of the automobile radar by adjusting the frequency source variable local oscillator, and the requirements of automatically adapting to automobile radar common waveforms such as FMCW, CW, FSK, MFSK and combinations thereof are met.
(3) The digital radio frequency storage is realized through the single digital processing unit, a time-varying distance Doppler target can be generated, continuous distance setting or arbitrary signal attenuation and gain can be provided, and compared with the prior art that a delay line is adopted to test a radar system, the method is more flexible and can meet the requirement of automobile radar test.
In one embodiment, the digital processing stand-alone comprises a high-speed ADC module 2021, an FPGA signal processing module 2022, and a high-speed DAC module 2023; the high-speed ADC module 2021 is connected with the FPGA signal processing module 2022, and the FPGA signal processing module 2022 is used for performing digital signal processing on the signals acquired by the ADC; the high-speed DAC module 2023 is connected to the FPGA signal processing module 2022, and the high-speed DAC module 2023 is configured to perform DAC playback on the digital signal output by the FPGA signal processing module.
In one embodiment, the high-speed ADC module 2021 includes a two-channel acquisition high-speed AD chip, and the high-speed DAC module 2023 includes a two-channel high-speed digital-to-analog conversion DA chip.
In one embodiment, when the radar function test is performed, the radar simulator includes 6 up-conversion modules and 1 down-conversion module, the antenna is horizontally connected to the spherical screen, and the receiving and transmitting antenna of the radar function test adopts a linearly polarized horn antenna.
In one embodiment, as shown in fig. 4, the simulator host further includes: the device comprises a single-board computer, an X-band transceiver module, a switch array, a power supply module and the like; the single board computer is used for operating display control software; the frequency source module is used for adjusting the waveform of the DAC playback signal to be matched with the waveform of the automobile radar; the X-band transceiver module is used for receiving or transmitting an X-band signal; the switch array is used for switching the emission band of the 77G-band emission component.
In one embodiment, the system further comprises a down-conversion component and an up-conversion component. The down-conversion component is used for down-converting the automobile radar signal received by the 77G waveband receiving component; the up-conversion component is used for up-converting the signal output by the digital processing single machine.
In one embodiment, the automotive radar target simulator further comprises a comprehensive display module, the simulator host machine is used for sorting received data result information (A/D acquisition signals, bandwidth, modulation period, pulse width, signal power and the like) and then rapidly sending the data result information to an upper computer network port, and upper computer software is used for obtaining the original data from the network port cache in real time through a packet capturing module. The comprehensive display module synchronously analyzes the original data captured by the packet capturing module, displays information such as bandwidth, modulation period, pulse width, signal power and the like in a list form on an upper computer software interface, and displays an IQ curve of an A/D (analog to digital) collected signal in a chart form.
The utility model discloses can realize the real-time modulation simulation of multi-target distance, Doppler and RCS, can be to millimeter wave radar performance like distance analog range, distance analog precision, distance analog step-by-step, speed analog range, speed analog precision and speed analog step-by-step carry out accurate aassessment analysis.
Based on the utility model discloses the full digital architecture who takes can test vehicle-mounted millimeter wave radar passageway performance, divide into transmission channel test and receiving channel test to radar system performance test, but transmission channel test EIRP, transmitting antenna directional diagram, frequency, phase noise, bandwidth, strays, power flatness, cycle, modulation linearity etc.; the receiving channel can test frequency, receiving antenna directional diagram, gain test and receiver sensitivity.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (6)
1. An automotive radar target simulator, the automotive radar target simulator comprising:
the simulator comprises an antenna assembly and a simulator host;
the antenna assembly comprises a 77G waveband receiving assembly and a plurality of 77G waveband transmitting assemblies, and the 77G waveband receiving assembly and the plurality of 77G waveband transmitting assemblies are arranged on a spherical screen system;
the simulator host includes: the system comprises a switch array module, a frequency source module and a digital processing single machine; the frequency source module is connected with each 77G waveband transmitting component and is used for adjusting the waveform of a transmitting signal to be matched with the transmitting waveform of an automobile radar;
77G wave band receiving assembly with the digital processing unit is connected, 77G wave band emission subassembly passes through the switch array module is connected the digital processing unit, the switch array module is used for switching 77G wave band emission subassembly's emission wave band.
2. The automotive radar target simulator of claim 1, wherein the digital processing unit comprises a high-speed ADC module, an FPGA signal processing module, and a high-speed DAC module;
the high-speed ADC module is connected with the FPGA signal processing module;
and the high-speed DAC module is connected with the FPGA signal processing module.
3. The automotive radar target simulator of claim 2, wherein the high-speed ADC module comprises a two-channel acquisition high-speed AD chip.
4. The automotive radar target simulator of claim 2, wherein the high-speed DAC module comprises a two-channel high-speed digital-to-analog conversion DA chip.
5. The automotive radar target simulator of claim 1, further comprising: a down conversion component and an up conversion component.
6. The automotive radar target simulator of claim 5, wherein the antenna in the antenna assembly is a horn antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123272453.4U CN216595484U (en) | 2021-12-23 | 2021-12-23 | Automobile radar target simulator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123272453.4U CN216595484U (en) | 2021-12-23 | 2021-12-23 | Automobile radar target simulator |
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| CN216595484U true CN216595484U (en) | 2022-05-24 |
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| CN202123272453.4U Active CN216595484U (en) | 2021-12-23 | 2021-12-23 | Automobile radar target simulator |
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2021
- 2021-12-23 CN CN202123272453.4U patent/CN216595484U/en active Active
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