CN113030873A - PD radar pulse pressure matching coefficient self-adaptation device based on FPGA - Google Patents
PD radar pulse pressure matching coefficient self-adaptation device based on FPGA Download PDFInfo
- Publication number
- CN113030873A CN113030873A CN202110346260.4A CN202110346260A CN113030873A CN 113030873 A CN113030873 A CN 113030873A CN 202110346260 A CN202110346260 A CN 202110346260A CN 113030873 A CN113030873 A CN 113030873A
- Authority
- CN
- China
- Prior art keywords
- module
- signal
- matching coefficient
- pulse pressure
- processing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- G01S7/28—Details of pulse systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention provides a pulse pressure matching coefficient self-adaptive device of a PD radar based on an FPGA, which is characterized by comprising an antenna front end module, an analog-digital conversion module, a DDS module, a time sequence control module, a pulse pressure matching generation module and a signal processing module; echo signals received by the antenna front-end module are respectively subjected to signal conversion and acquisition through a plurality of first analog-digital converters in the analog-digital conversion module, and then are input into a signal processor for subsequent signal processing; and a second analog-digital converter in the analog-digital conversion module acquires the LFM signal output by the DDS module, and the acquired LFM signal is input to the matching coefficient generation module for processing. The invention realizes the optimal signal processing of pulse compression and reduces the accumulation of noise only by adaptively matching different LFM signals output by the DDS module with different pulse pressure matching coefficients. Time for waveform design and code reconstruction is saved.
Description
Technical Field
The invention belongs to the technical field of PD radars, and particularly relates to a PD radar pulse pressure matching coefficient self-adaptive design and a device based on an FPGA.
Background
Chinese granted patent CN109375175B discloses a system and a method for supporting multi-waveform radar signal transmission and reception, which support multi-waveform radar signal transmission and reception, and the system includes: the FPGA module and the DSP module; the FPGA module comprises a waveform sending module, an echo receiving module and a chip configuration module. The method has the characteristics of flexible control, strong expansibility, high adaptability and the like, improves the anti-interference performance of the system by utilizing the dynamic switching among the waveforms, and meets the requirements of quick tracking and identification of the moving target.
International patent publication WO2020198470a1 discloses a software-defined radar system, which also employs a radio frequency transceiver module, an analog-to-digital conversion module, an FPGA module, and a DSP module to form a radar system capable of performing pulse control and waveform adjustment.
If the PD radar wants to change the transmitted waveform, it will modify the corresponding configuration parameters, such as LFM signal, repetition period of the transmitted waveform, pulse width and pulse accumulation number. If the LFM signal is modified, the signal processing flow of the PD radar realized in the FPGA is influenced.
In general, when the LFM signal is kept unchanged, a scheme of solidifying the matching coefficient corresponding to the LFM into the ROM is often adopted. However, this solution is only applicable to a PD radar system with a single LFM signal, which is not favorable for system adaptation. When a new waveform needs to be used, the waveform and pulse pressure matching coefficients need to be redesigned and the code needs to be recompiled, thus increasing the workload and time consumption. Therefore, it is significant to design a PD radar pulse pressure matching coefficient adaptive device based on FPGA.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to design a PD radar pulse pressure matching coefficient self-adaptive device based on an FPGA (field programmable gate array) to finish the operation of PD radar pulse pressure coefficient self-adaptation. And the whole PD radar system is matched to perfect the configuration of waveform design parameters.
The invention provides a pulse pressure matching coefficient self-adaptive device of a PD radar based on an FPGA, which comprises: the device comprises an antenna front-end module (1), an analog-digital conversion module (2), a DDS module (3), a time sequence control module (4), a pulse pressure matching coefficient generation module (5) and a signal processing module (6);
echo signals received by the antenna front-end module (1) are respectively subjected to signal conversion and acquisition through a plurality of first analog-digital converters in the analog-digital conversion module (2), and then input into the signal processing module (6) for subsequent signal processing; a second analog-digital converter in the analog-digital conversion module (2) collects the LFM signal output by the DDS module (3), and the collected LFM signal is input to the pulse pressure matching coefficient generation module (5) for processing; the antenna front-end module (1) carries out up-conversion processing on the intermediate frequency LFM signal output by the DDS module (3), and the radio frequency signal is finished through antenna transmission processing;
the analog-digital conversion module (2) is a group of high-speed AD conversion modules and is used for collecting down-conversion intermediate-frequency signals received by the antenna front-end module (1) in real time;
the DDS module (3) is used for generating a transmitting signal waveform required by the front-end antenna module (1) according to the configured transmitting waveform parameters;
the time sequence control module (4) is used for generating a receiving and sending control signal of the antenna front-end module (1), and controlling a single AD to collect an LFM signal generated by the DDS module (3) in a loop when the AD is transmitted at the front end;
the pulse pressure matching coefficient generating module (5) is used for acquiring the single path of the LFM signal acquired by the AD in a loop to generate an optimal matching receiver;
and the signal processing module (6) is used for receiving and processing the echo signal to complete digital down-conversion and pulse compression processing.
Furthermore, the DDS module generates different LFM signals according to different waveform configurations, and the receiver can reach the optimal matching state of the echo each time through the acquisition and processing of the loop AD. Without the need to re-compensate for the matching coefficient overloading due to the transformed waveform.
Furthermore, the time sequence control module provides time sequence signals for the DDS module and the analog-digital conversion module, and completes the time sequence control of the analog-digital conversion module for echo acquisition time sequence and LFM signal accurate acquisition.
Furthermore, the time sequence control module performs matching design according to different parameters to generate system time sequence changes generated by different configuration parameters.
Further, the matching coefficient generation module receives the LFM signal digital acquisition signal output by the second analog-to-digital converter, generates a matching coefficient, and provides the generated matching coefficient to the signal processing module.
Further, the matching coefficient generation module loops the LFM signal generated in the parameter DDS module back to the second analog-to-digital converter, and controls the AD to acquire the current loop signal through the control timing generated by the timing control module; and performing down-conversion processing on the sampled signals, then performing FFT (fast Fourier transform), and finally performing conjugate complex transform on the transformed signals to obtain matched filter coefficients under the current parameter configuration.
Further, the signal processing module completes down-conversion and pulse compression signal processing of the digital intermediate frequency signal, and performs matched filtering processing according to the pulse pressure matching coefficient generated by the pulse pressure matching coefficient generating module and the signal after down-conversion.
Furthermore, the antenna front-end module performs up-conversion processing on the LFM signal generated by the DDS module in a radar transmission stage, converts the LFM signal into a radio frequency signal, and radiates the radio frequency signal. In the radar receiving stage, the echo signals received by the antenna array surface are subjected to down-conversion processing for one time, converted into subsequent multi-channel intermediate frequency, and input into the plurality of first analog-digital converters for signal conversion and acquisition.
The method of the invention realizes the optimal signal processing of pulse compression and reduces the accumulation of noise only by adaptively matching different pulse pressure matching coefficients of different LFM signals output by the DDS module. In addition, the time of waveform design and code reconstruction is saved, and the design efficiency is greatly improved. By using
Drawings
FIG. 1 is a schematic diagram of the operation of the present invention;
FIG. 2 is a flowchart of the operation of the pulse pressure matching coefficient generation module;
FIG. 3 is a timing control diagram.
Detailed Description
The invention provides a PD radar pulse pressure matching coefficient self-adaptive device design based on FPGA, as shown in figure 1, and takes 7 series FPGA chips of xilinx company as research and development basis, and the device comprises 6 modules, an antenna front-end module, a digital AD module, a DDS module, a time sequence control module, a matching coefficient generation module and a signal processing module. And the antenna front-end module completes up-conversion processing of the intermediate frequency LFM signal output by the DDS module and transmits a radio-frequency signal. The digital AD module is processed in two parts, wherein the first part finishes the acquisition of echo signals and is matched with the subsequent signal processing; and the second part is used for completing the acquisition of LFM signals output by the DDS module and matching with the subsequent processing of the matching coefficient generation module. The DDS module completes corresponding LFM signal generation mainly according to different waveform configurations. And the time sequence control module completes the control of the AD echo acquisition time sequence and the time sequence control of the accurate acquisition of the LFM signals. And the matching coefficient generation module completes the generation of the matching coefficient of the collected LFM signal. The signal processing module completes the realization of a series of signal processing algorithms such as down-conversion, pulse compression and the like.
The invention is configured according to different radar waveform parameters, and can quickly respond to echo matching coefficients corresponding to different waveforms. The generation of the optimal echo matching coefficient can be dynamically adjusted by acquiring the LFM signal produced by the DDS module through the AD loop, so that the radar is adjusted to quickly respond to the working state on different frequencies.
The following detailed description of embodiments of the invention refers to the accompanying drawings.
The utility model provides a PD radar pulse pressure matching coefficient self-adaptation's device design based on FPGA, as shown in figure 1 structure picture, includes antenna front end module 1, digital AD module 2, DDS module 3, sequential control module 4, pulse pressure matching generates module 5, and signal processing module 6 constitutes.
When the front-end antenna module finishes the transmitting stage, the LFM signal generated by the DDS module is subjected to up-conversion processing and is converted into a radio frequency signal to be radiated. When the switch is switched to a receiving stage, the echo signals received from the front side are subjected to down-conversion processing for one time, and are converted into intermediate frequency signals which can be acquired by the following four intermediate frequency digital AD.
The first part of the AD module mainly completes digital sampling processing of the intermediate frequency echo signals processed by the front end of the antenna, and sends the sampled data to the signal processing module for subsequent processing; the second part is mainly completed, the intermediate frequency LFM signal output by the DDS module is sampled, and then the sampled data is sent to the pulse pressure matching coefficient generation module for subsequent processing.
The DDS module is mainly completed and generates different LFM signals corresponding to different waveform parameter configurations. One path of signal is directly accessed into a radio frequency subsystem at the front end of the antenna to complete digital up-conversion processing; and the other path of the LFM intermediate frequency signal is matched with the AD module of the single path through a time sequence control module to input the same LFM intermediate frequency signal into the AD module to complete signal sampling processing.
The time sequence control module completes the echo time sequence design controlled by the parameters. And performing matching design according to different parameters so as to complete system time sequence change caused by introducing different configuration parameters. The method mainly comprises the following steps: 1. and finishing the determination of the AD acquisition time according to the issued repetition period parameter configuration. Ensuring that AD is within the allowable range of system waveform design, and completing echo data acquisition with the maximum number of points under single echo reception; 2. according to the issued pulse width parameter configuration, the maximum pulse width configuration in the DDS module is completed, and the matching between the time sequence of AD echo acquisition and the time sequence of the LFM signal generated by transmitting echo is ensured; 3. and according to the two configuration parameters, completing the optimal transmission signal time sequence design. 4. And a time sequence for acquiring the LFM signal is generated, so that the working time sequence of acquiring the AD by the single LFM signal is not influenced while four intermediate-frequency AD acquisition intermediate-frequency echo signals are acquired. The overall time sequence takes the repetition period of the configuration pulse as a reference, takes the pulse width as a standard, separates out the transmitting switch time sequence of the antenna processor, and finally determines the working time sequence of the proper antenna transmitter by considering the corresponding hardware delay.
And the pulse pressure matching coefficient generation module completes the generation of the matching coefficient under the current parameter configuration. Firstly, an LFM signal generated in a parameter DDS module is looped back to a single path of AD, and then the AD is controlled to acquire a current looped back signal through a control time sequence generated by a time sequence control module. And performing down-conversion processing on the sampled signals, then performing FFT (fast Fourier transform), and finally performing conjugate complex transform on the transformed signals to obtain the matched filter coefficients under the current parameter configuration.
The signal processing module is mainly used for performing digital down-conversion processing on four-channel signals subjected to four-path intermediate frequency AD sampling. And performing matched filtering processing on the pulse pressure matching coefficient generated in the pulse pressure matching coefficient generating module and the signal after down-conversion, and finally performing pulse compression processing on the signal to obtain a final distance direction pulse pressure signal.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and not for limiting, and although the embodiments of the present invention are described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the embodiments of the present invention without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. The pulse pressure matching coefficient self-adaptive device of the PD radar based on the FPGA is characterized by comprising the following steps: the device comprises an antenna front-end module (1), an analog-digital conversion module (2), a DDS module (3), a time sequence control module (4), a pulse pressure matching coefficient generation module (5) and a signal processing module (6);
echo signals received by the antenna front-end module (1) are respectively subjected to signal conversion and acquisition through a plurality of first analog-digital converters in the analog-digital conversion module (2), and then input into the signal processing module (6) for subsequent signal processing; a second analog-digital converter in the analog-digital conversion module (2) collects the LFM signal output by the DDS module (3), and the collected LFM signal is input to the pulse pressure matching coefficient generation module (5) for processing; the antenna front-end module (1) carries out up-conversion processing on the intermediate frequency LFM signal output by the DDS module (3), and the radio frequency signal is finished through antenna transmission processing;
the analog-digital conversion module (2) is a group of high-speed AD conversion modules and is used for collecting down-conversion intermediate-frequency signals received by the antenna front-end module (1) in real time;
the DDS module (3) is used for generating a transmitting signal waveform required by the front-end antenna module (1) according to the configured transmitting waveform parameters;
the time sequence control module (4) is used for generating a receiving and sending control signal of the antenna front-end module (1), and controlling a single AD to collect an LFM signal generated by the DDS module (3) in a loop when the AD is transmitted at the front end;
the pulse pressure matching coefficient generating module (5) is used for acquiring the single path of the LFM signal acquired by the AD in a loop to generate an optimal matching receiver;
and the signal processing module (6) is used for receiving and processing the echo signal to complete digital down-conversion and pulse compression processing.
2. The adaptive apparatus according to claim 1, wherein the DDS module generates different LFM signals according to different waveform configurations, and the acquisition process of the loop AD enables the receiver to achieve the best matching state of the echo each time without re-compensating the matching coefficient overloading caused by transforming the waveform.
3. The adaptive pulse pressure matching coefficient device according to claim 1, wherein the timing control module provides timing signals to the DDS module and the adc module to perform timing control of the adc module for echo acquisition and for accurate LFM signal acquisition.
4. The adaptive pulse pressure matching coefficient device of claim 3, wherein the timing control module performs matching design according to different parameters to generate system timing changes generated by different configuration parameters.
5. The adaptive apparatus for pulse pressure matching coefficient according to claim 1, wherein the matching coefficient generating module receives the LFM signal digital acquisition signal outputted from the second adc, generates the matching coefficient, and provides the generated matching coefficient to the signal processing module.
6. The adaptive device for pulse pressure matching coefficient according to claim 5, wherein the matching coefficient generating module loops back the LFM signal generated in the parameter DDS module to the second analog-to-digital converter, and controls the AD to acquire the current loop signal through the control timing sequence generated by the timing control module; and performing down-conversion processing on the sampled signals, then performing FFT (fast Fourier transform), and finally performing conjugate complex transform on the transformed signals to obtain matched filter coefficients under the current parameter configuration.
7. The adaptive apparatus according to claim 1, wherein the signal processing module performs down-conversion of the digital intermediate frequency signal and pulse compression signal processing, and performs matched filtering processing according to the pulse pressure matching coefficient generated by the pulse pressure matching coefficient generating module and the down-converted signal.
8. The adaptive apparatus according to claim 1, wherein the antenna front-end module performs up-conversion processing on the LFM signal generated by the DDS module during the radar transmission stage, converts the LFM signal into a radio frequency signal, and radiates the radio frequency signal; in the radar receiving stage, the echo signals received by the antenna array surface are subjected to down-conversion processing for one time, converted into subsequent multi-channel intermediate frequency, and input into the plurality of first analog-digital converters for signal conversion and acquisition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110346260.4A CN113030873A (en) | 2021-03-31 | 2021-03-31 | PD radar pulse pressure matching coefficient self-adaptation device based on FPGA |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110346260.4A CN113030873A (en) | 2021-03-31 | 2021-03-31 | PD radar pulse pressure matching coefficient self-adaptation device based on FPGA |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113030873A true CN113030873A (en) | 2021-06-25 |
Family
ID=76453138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110346260.4A Pending CN113030873A (en) | 2021-03-31 | 2021-03-31 | PD radar pulse pressure matching coefficient self-adaptation device based on FPGA |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113030873A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288941A (en) * | 2011-05-19 | 2011-12-21 | 北京航空航天大学 | Intermediate frequency linear frequency modulation-pulse Doppler (LFM-PD) radar signal real-time processing system based on field programmable gate array (FPGA) and digital signal processor (DSP) and processing method |
| CN110109074A (en) * | 2019-04-18 | 2019-08-09 | 西安电子科技大学 | Radar signal preprocess method based on RFSoC chip |
| CN110673139A (en) * | 2019-10-22 | 2020-01-10 | 成都汇蓉国科微系统技术有限公司 | Target detection radar system pulse compression coefficient generation method and device |
| CN111090093A (en) * | 2019-12-11 | 2020-05-01 | 成都汇蓉国科微系统技术有限公司 | PD radar emission waveform configuration method and device based on FPGA |
-
2021
- 2021-03-31 CN CN202110346260.4A patent/CN113030873A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288941A (en) * | 2011-05-19 | 2011-12-21 | 北京航空航天大学 | Intermediate frequency linear frequency modulation-pulse Doppler (LFM-PD) radar signal real-time processing system based on field programmable gate array (FPGA) and digital signal processor (DSP) and processing method |
| CN110109074A (en) * | 2019-04-18 | 2019-08-09 | 西安电子科技大学 | Radar signal preprocess method based on RFSoC chip |
| CN110673139A (en) * | 2019-10-22 | 2020-01-10 | 成都汇蓉国科微系统技术有限公司 | Target detection radar system pulse compression coefficient generation method and device |
| CN111090093A (en) * | 2019-12-11 | 2020-05-01 | 成都汇蓉国科微系统技术有限公司 | PD radar emission waveform configuration method and device based on FPGA |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN212433393U (en) | Radar interference simulation equipment | |
| CN103079471B (en) | Ultrasound probe and diagnostic ultrasound equipment | |
| CN1175609C (en) | Multiple carrier software radio transceiver and its intelligent antenna performance improving method | |
| CN109655797B (en) | High-performance generalized multi-channel radar system | |
| CN111175708B (en) | Automatic gain control system and method for active phase scanning ground reconnaissance radar | |
| CN108051791A (en) | A kind of phased-array radar universal calibration device | |
| EP1718988A2 (en) | Rf channel calibration for non-linear fm waveforms | |
| CN101931425A (en) | Digital receiver | |
| CN114185008A (en) | System and method for compensating amplitude-phase error of receiving channel of narrow-band digital array radar system | |
| CN110146892A (en) | A kind of dual polarization radar | |
| CN112255593A (en) | Frequency conversion assembly for target classification recognition radar | |
| CN113030873A (en) | PD radar pulse pressure matching coefficient self-adaptation device based on FPGA | |
| CN101814940B (en) | Digital intermediate frequency optical fiber repeater and adopted multi-channel digital frequency selection signal processing method thereof | |
| US20060214841A1 (en) | Distance measuring system | |
| RU2399088C2 (en) | Multifunctional computer system for processing radar signals | |
| CN209105177U (en) | A kind of number TR component | |
| CN114636672B (en) | Photoacoustic and ultrasonic multiplexing acquisition system and method | |
| CN113433515B (en) | Linear frequency modulation continuous wave intermediate frequency receiving radar | |
| CN210243826U (en) | Radar multichannel signal preprocessing device and pulse compression unit thereof | |
| CN201594137U (en) | Main wave multiplexing pulse radar receiver | |
| CN112653424A (en) | Signal processing method, device and computer readable storage medium | |
| CN215340295U (en) | Multichannel radar responder based on frequency spectrum regeneration technology | |
| CN111865851B (en) | Intermediate frequency digital processing system | |
| CN113949466B (en) | System for realizing automatic ultra-wideband wireless signal acquisition, transmission and processing | |
| CN112363164B (en) | Electronic reconnaissance and SAR reconnaissance integrated load and target reconnaissance identification method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |