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FPGA-based frequency domain pulse compression processing method of LFM pulse radar

A pulse compression and pulse radar technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as difficult processing and consumption of FPGA multiplier resources, and achieve the effect of saving hardware resources, ensuring speed and flexibility

Pending Publication Date: 2019-10-08
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0006] In practical applications, if the digital pulse pressure time-domain processing method of the above formula is used, when the order of the filter is very high and the signal x(n) is in complex form, the process of realizing the pulse pressure will consume a large amount of FPGA multiplier resources , it is difficult to implement the process with FPGA

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  • FPGA-based frequency domain pulse compression processing method of LFM pulse radar
  • FPGA-based frequency domain pulse compression processing method of LFM pulse radar
  • FPGA-based frequency domain pulse compression processing method of LFM pulse radar

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Embodiment

[0047] combine figure 1 , the present invention is based on the FPGA-based LFM pulse radar frequency-domain pulse compression processing method, and the steps are as follows:

[0048] Simulation conditions: bandwidth B=40MHz, pulse width T=32us, pulse repetition period Tr=512us LFM pulse signal, 1 CPI (Coherent Processing Interval) contains 10 PRI (Pulse Repetition Interval), A / D sampling rate It is 50mhz, the number of sampling points in each PRI is 25600, the target distance is 10000m, the speed is 1500m / s, and the signal-to-noise ratio is 10dB. A CPI internal echo sampling data such as figure 2 shown, image 3 Sample data for echoes within 1 PRI.

[0049] first step:

[0050] From the pulse width T=32us, the A / D sampling rate is 50MHz, the length M of the digital pulse compression filter can be obtained as 1600 steps, and the filter coefficient h(n) is generated according to the transmitted signal waveform, such as Figure 4 shown. The number of points N for one FFT ...

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Abstract

The invention discloses an FPGA-based frequency domain pulse compression processing method of an LFM pulse radar. According to the method, LFM pulse radar echo sampling data are segmented and frequency domain pulse compression is performed; and then all segments are intercepted and are spliced to obtain a final frequency domain pulse pressure result. Therefore, the multiplier resources of the FPGAare saved substantially while the correctness and real-time performance of the data processing are ensured.

Description

Technical field: [0001] The invention belongs to the field of radar signal processing, in particular to an FPGA-based linear frequency modulation (Linear Frequency Modulation, LFM) pulse radar frequency-domain pulse compression processing method. Background technique [0002] With the rapid development of radar technology, the requirements for the radar system's operating range, target signal resolution and measurement accuracy are getting higher and higher. According to the theory of radar signal, the operating distance of radar is limited by the peak power of the transmitter, and it is necessary to increase the pulse width to increase the signal energy; the signal bandwidth determines the distance resolution of the radar. For a single carrier frequency signal, the time-width-bandwidth product is close to 1, and there is a contradiction between the distance resolution and the operating range. According to the matched filter theory, the pulse compression technology based on...

Claims

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Application Information

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IPC IPC(8): G01S7/32G01S7/41G01S7/292
CPCG01S7/32G01S7/41G01S7/2923Y02A90/10
Inventor 张仁李张昕盛卫星马晓峰韩玉兵
Owner NANJING UNIV OF SCI & TECH
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