PCIe-based multi-waveform radar signal acquisition and transmission system and method

Abstract

The invention discloses a PCIe-based multi-waveform radar signal acquisition and transmission system and method. The system comprises a DA waveform generation module, a data acquisition module, an optical fiber module A, an optical fiber module B, an FIFO cache module and a PCIe transmission module. The DA waveform generation module is used for converting a digital waveform signal issued by the upper computer into an analog signal and transmitting the analog signal; the data acquisition module converts the electromagnetic wave analog signal reflected by the target into a digital signal; the optical fiber module A encapsulates radar acquisition data into a formulated format, is connected with an optical fiber through the optical module and sends the data, and unpacks waveform information transmitted by the optical fiber; the optical fiber module B receives data transmitted by the optical fiber and transmits waveform information to the module A; and the DDR4 storage module divides the DDR4 into three storage spaces, the first storage space stores data issued by the CPU, the other two storage spaces perform ping-pong caching on the acquired data, and finally communication between the radar and an upper computer is realized through PCIe, including issuing of waveform information and uploading of acquired echoes.

Description

Technical Field

[0001] The present invention relates to the field of radar data acquisition and transmission, and particularly to a variable transmit waveform radar data acquisition and transmission system and method based on PCIe. Background Art

[0002] In recent years, with the continuous development of radar technology, the demand for effective target detection has increased, which has prompted radars to have more comprehensive functions. Conventional radars usually use fixed-form transmit signals, and then perform processes such as digital quadrature demodulation, pulse compression, moving target detection, and constant false alarm detection. For different application scenarios, different radar design schemes are required. Therefore, a multi-waveform configurable signal transmit scheme is used to target different scenarios, and then after receiving the radar echo, it is AD sampled and digitally quadrature demodulated to obtain the baseband signal and then uploaded to the signal processor.

[0003] For the sake of personnel safety, usually the radar array and the signal processor are not integrated. Therefore, after obtaining the baseband signal, it is transmitted to the signal acquisition board card via optical fiber, and then the data is uploaded to the signal processor through a high-speed data interface to complete subsequent signal processing tasks. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-waveform radar signal acquisition and transmission system and method based on PCIe.

[0005] The technical solution for achieving the purpose of the present invention is: a multi-waveform radar signal acquisition and transmission system based on PCIe, including a DA waveform generation module, a data acquisition module, an optical fiber module A, an optical fiber module B, a FIFO buffer module, and a PCIe transmission module.

[0006] The DA waveform generation module is used to convert the digital waveform signal issued by the host computer into an analog signal for transmission;

[0007] The data acquisition module correctly samples the target echo signal collected by the radar by adjusting the signal delay, and obtains the baseband signal through quadrature demodulation;

[0008] The optical fiber module A sends the baseband signal through the optical fiber according to a certain data frame, and also unpacks the optical fiber received waveform information packet;

[0009] The optical fiber module B unpacks the baseband signal data packet and gives the corresponding enable signal;

[0010] The FIFO buffer module splices the data and converts it into an AXI4 protocol interface signal;

[0011] The PCIe transmission module realizes the DDR4 and CPU memory mapping through the gold finger and the PCIe card slot, enabling the CPU to send waveform data to the FPGA and the FPGA to transmit the echo baseband signal to the CPU memory.

[0012] A multi-waveform radar signal acquisition and transmission method based on PCIe includes:

[0013] The DA waveform generation module converts the digital waveform signal sent by the host computer into an analog signal for transmission;

[0014] The data acquisition module correctly samples the target echo signal collected by the radar by adjusting the signal delay and obtains the baseband signal through quadrature demodulation;

[0015] The optical fiber module A sends the baseband signal through the optical fiber according to a certain data frame and also unpacks the optical fiber received waveform information packet;

[0016] The optical fiber module B unpacks the baseband signal data packet and gives the corresponding enable signal;

[0017] The FIFO buffer module splices the data and converts it into an AXI4 protocol interface signal;

[0018] The PCIe transmission module realizes the DDR4 and CPU memory mapping through the gold finger and the PCIe card slot, enabling the CPU to send waveform data to the FPGA and the FPGA to transmit the echo baseband signal to the CPU memory.

[0019] Compared with the prior art, the remarkable advantages of the present invention are: (1) The present invention realizes the acquisition and transmission of high-speed and large amounts of data through the DAC chip, FIFO buffer, data bit splicing, serial-to-parallel conversion, DDR4 and PCIe3.0 interfaces; (2) The present invention can configure any transmission waveform to adapt to different application scenarios.

[0020] (3) The present invention splices the data bits of the collected multiple signals, improving the transmission speed during data storage. Description of the Drawings

[0021] Figure 1 is the structural block diagram of the multi-waveform radar signal acquisition and transmission system based on PCIe of the present invention.

[0022] Figure 2 is Figure 1 the structural block diagram of the data acquisition module in

[0023] Figure 3 is Figure 1 the structural block diagram of the optical fiber data transmission module in

[0024] Figure 4 is Figure 1Block diagram of the FIFO cache module in [Chinese].

[0025] Figure 5 is Figure 1 Block diagram of the PCIe transmission module in [Chinese]. Specific implementation manner

[0026] Combined with Figure 1 , the PCIe-based multi-waveform radar signal acquisition and transmission system of the present invention includes a DA waveform generation module, a data acquisition module, an optical fiber module A, an optical fiber module B, a FIFO cache module, and a PCIe transmission module.

[0027] The DA waveform generation module is used to convert the digital waveform signal sent by the host computer into an analog signal for transmission;

[0028] The data acquisition module correctly samples the target echo signal collected by the radar by adjusting the signal delay, and obtains the baseband signal through quadrature demodulation;

[0029] The optical fiber module A sends the baseband signal through the optical fiber according to a certain data frame, and also unpacks the optical fiber received waveform information packet;

[0030] The optical fiber module B unpacks the baseband signal data packet and gives the corresponding enable signal;

[0031] The FIFO cache module splices the data and converts it into an AXI4 protocol interface signal;

[0032] The PCIe transmission module realizes the DDR4 and CPU memory mapping through the gold finger and the PCIe card slot, enables the CPU to send waveform data to the FPGA, and the FPGA transmits the echo baseband signal to the CPU memory.

[0033] Furthermore, the DA waveform transmission module includes:

[0034] A waveform configuration module, which is used to generate a sampling clock and a sampling signal for the DA chip by using the ODDR primitive for the digital waveform;

[0035] A mode configuration module, which is used to configure the data input format of the DAC chip and registers such as the FIFO cache.

[0036] Furthermore, the data acquisition module includes:

[0037] An AD acquisition module, which converts the differential signal collected by the AD chip into a single-ended signal through the IBUFDS primitive, and then adjusts the timing of the sampling clock, frame clock, and data channel through the IDELAY2 primitive to meet the sampling requirements;

[0038] Digital quadrature demodulation is used to demodulate the intermediate-frequency signal collected by AD through digital mixing to the baseband signal.

[0039] Furthermore, the optical fiber module A includes:

[0040] A data unpacking module unpacks the received optical fiber data to obtain the original information and gives the corresponding enable signal;

[0041] A GTH transmit / receive module is responsible for the transmission and reception of optical fiber data.

[0042] Furthermore, the optical fiber module B includes:

[0043] A data unpacking module unpacks the received optical fiber data to obtain the original information and gives the corresponding enable signal;

[0044] A GTH transmit / receive module is responsible for the transmission and reception of optical fiber data.

[0045] Furthermore, the FIFO buffer module includes:

[0046] A data splicing module first stores information such as data wave position numbers and pulse numbers before the data arrives, and then completes the data bit splicing of multiple channels of data according to the data format.

[0047] An interface conversion module converts the data information into the AXI4 protocol.

[0048] Furthermore, the PCIe transmission module includes:

[0049] A DDR4 module divides the DDR4 into three spaces for storing the downloaded waveform data and the ping-pong cache for uploading data.

[0050] An XDMA module is used to configure the parameters and interfaces of the PCIe core, enabling data to be transmitted between the CPU memory and the DDR4 through the gold fingers and the PCIe 3.0 slot.

[0051] The present invention will be further described below with reference to the accompanying drawings.

[0052] Combined with Figure 1 , the multi-waveform radar signal acquisition and transmission system based on PCIe in this embodiment includes a DA waveform generation module, a data acquisition module, an optical fiber module A, an optical fiber module B, an FIFO buffer module, and a PCIe transmission module.

[0053] The data acquisition module correctly samples the target echo signal collected by the radar by adjusting the signal delay and obtains the baseband signal through quadrature demodulation;

[0054] The DA waveform generation module is used to convert the digital waveform signal sent by the host computer into an analog signal for transmission, and the transmission signal frequency is 800 MHz;

[0055] The data acquisition module correctly samples the target echo signal collected by the radar by adjusting the signal delay, and obtains the baseband signal through quadrature demodulation. The sampling rate is 4 channels of 100 MHz, the data bit width is 16 bits, and it becomes 8 channels after quadrature demodulation;

[0056] The optical fiber module A sends the baseband signal through the optical fiber according to a certain data frame, and also unpacks the optical fiber received waveform information packet. The data bit width is 64 bits;

[0057] The optical fiber module B unpacks the baseband signal data packet and gives the corresponding enable signal;

[0058] The FIFO buffer module splices the data into 256 bits and converts it into an AXI4 protocol interface signal;

[0059] The PCIe transmission module realizes the DDR4 and CPU memory mapping through the gold finger and the PCIe card slot, enabling the CPU to send waveform data to the FPGA and the FPGA to transmit the echo baseband signal to the CPU memory.

Claims

1. An arbitrary waveform radar signal acquisition and transmission system based on PCIe, characterized in that It includes a DA waveform emission module, a data acquisition module, an optical fiber module A, an optical fiber module B, a DDR4 storage module, and a PCIe transmission module. The DA waveform emission module is used to configure the DA chip according to the digital emission waveform issued by the CPU, so that the DA chip emits the corresponding analog signal; The data acquisition module is used to convert the electromagnetic wave analog signal after target reflection into a digital signal; The optical fiber module A is used to receive the digital waveform information issued by the optical fiber module B, and convert the multiplexed received echo data into single-channel transmission data and send it to the optical fiber module B; The optical fiber module B is used to receive the echo data sent by the optical fiber module A and unpack the data; The FIFO buffer module is used to splice data and convert it into an AXI4 protocol interface signal The PCIe transmission module realizes the communication between the FPGA and the CPU through DDR4, the gold finger, and the PCIe slot of the CPU, and completes the upload of echo data and the issuance of waveform data.

2. The arbitrary waveform radar signal acquisition and transmission system based on PCIe according to claim 1, characterized in that The DA waveform emission module includes: A waveform configuration module, which is used to generate a sampling clock and a sampling signal for the DA chip through the ODDR primitive for the digital waveform; A mode configuration module, which is used to configure the data input format of the DAC chip and registers such as the FIFO buffer.

3. The arbitrary waveform radar signal acquisition and transmission system based on PCIe according to claim 1, characterized in that The data acquisition module includes: An AD acquisition module, which converts the differential signal into a single-ended signal through the IBUFDS primitive for the data acquired by the AD chip, and then adjusts the timing of the sampling clock, frame clock, and data channel through the IDELAY2 primitive to meet the sampling requirements; Digital quadrature demodulation, which uses digital mixing to demodulate the intermediate frequency signal acquired by AD to the baseband signal.

4. The arbitrary waveform radar signal acquisition and transmission system based on PCIe according to claim 1, characterized in that, The optical fiber module A includes: A data encapsulation module, which encapsulates information such as the frame header, packet count, data length, and frame tail for the data to be transmitted, and unpacks the received data at the same time; A GTX transmit / receive module, which is responsible for the transmission and reception of optical fiber data.

5. The arbitrary waveform radar signal acquisition and transmission system based on PCIe according to claim 1, characterized in that, The optical fiber module B includes: A data unpacking module, which unpacks the received optical fiber data to obtain the original information and gives the corresponding enable signal; A GTH transmit / receive module, which is responsible for the transmission and reception of optical fiber data.

6. The arbitrary waveform radar signal acquisition and transmission system based on PCIe according to claim 1, characterized in that The FIFO buffer module includes: A data splicing module, which first stores information such as data wave position numbers and pulse numbers before the data arrives, and then completes the data bit splicing of the multiplexed data according to the data format. An interface conversion module, which converts the data information into the AXI4 protocol.

7. The arbitrary waveform radar signal acquisition and transmission system based on PCIe according to claim 1, characterized in that, The PCIe transmission module: A DDR4 module, which divides DDR4 into three spaces for storing the issued waveform data and ping-pong caching of the uploaded data. An XDMA module, which is used to configure the parameters and interfaces of the PCIe core, so that the data is transmitted between the CPU memory and DDR4 through the gold finger and the PCIe3.0 slot.

8. An arbitrary waveform radar signal acquisition and transmission system based on the system according to any one of claims 1-7, characterized in that, It includes: The DA waveform emission module configures the DA chip according to the waveform information issued by the upper computer; The data acquisition module correctly samples the target echo signal collected by the radar by adjusting the signal delay, and obtains the baseband signal through quadrature demodulation; The optical fiber module A transmits the baseband signal through the optical fiber according to a certain data frame, and also unpacks the waveform information packet received by the optical fiber. The optical fiber module B unpacks the baseband signal data packet and gives the corresponding enable signal. The FIFO buffer module splices the data and converts it into an AXI4 protocol interface signal. The PCIe transmission module realizes the DDR4 and CPU memory mapping through the gold fingers and the PCIe card slot, enabling the CPU to send waveform data to the FPGA and the FPGA to transmit the echo baseband signal to the CPU memory.

9. The system according to claim 7, wherein The specific working mode of the PCIe transmission module is as follows: The DDR4 space is divided into three parts. The first part of 512 bytes is the waveform data sent by the host computer. The second part of 25MB is the ping-pong storage A space for the echo baseband signal. The third part of 25MB is the ping-pong storage B space for the echo baseband signal. The FPGA configures the XDMA IP core with a clock of 250MHz, a transmission channel number of x8, and selects the AXIMM interface.

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