Method for processing real time digital pulse compression system based on FPGA
A technology of pulse compression and processing method, which is applied in the direction of radio wave measurement systems and instruments, and can solve problems such as difficult to meet real-time processing requirements, high power consumption, and difficult to be widely used.
Inactive Publication Date: 2011-06-01
HUBEI SANJIANG SPACE XIANFENG ELECTRONICS&INFORMATION CO LTD
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Problems solved by technology
Most of the current digital pulse compression systems use the frequency domain processing method. The pulse compression processing requires a large amount of calculation and has high requirements for real-time performance. Generally, more DSP hardware platforms are used to realize the hardware system. The hardware system is complex and consumes a lot of power, so it is not easy to be widely used.
Using FPGA to process radar pulse signals with a large time-width-bandwidth product often requires a long processing time, and it is difficult to meet the real-time processing requirements in some occasions
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[0019] The present invention will be described in further detail below in conjunction with accompanying drawing
[0020] Pulse compression technology has a broad application prospect in the field of precision guidance because it solves the contradiction between radar operating range and resolution. At present, step frequency hopping pulse compression system, linear frequency modulation pulse compression system and linear frequency modulation plus step frequency hopping secondary pulse compression system are commonly used for automatic target recognition. The signal processing process is as follows: figure 1 shown. Among them, pulse compression is mainly used to improve signal detection performance, thereby improving the effect of target recognition.
[0021] Based on the FPGA processing platform, the invention realizes the optimal design of the real-time digital pulse compression system. Its processing flow is as figure 2 As shown, after the IF signal is sampled by A / D, th...
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The invention relates to a treating method based on an FPGA real-time digital pulse compression system, which comprises the steps that: an intermediate frequency signal which is sampled by A / D carries out amplitude judgment, and then, the method carries out the following steps of FFT treatment, matching multiplication treatment, IFFT treatment and pulse pressure result output. After the inventionadopts the method, 4096 point data carry out frequency domain digital pulse compression; 8 dish-shaped operators, 32 RAM (128 *32bits) and 48 ROM (934*32bits) are selected to operate; the system treating speed is 100MHz, the whole compression treatment only needs 49us, the FFT spends 23040ns, the integrative filtration spends 2560ns, and the IFFT spends 23040ns; the optimization design method cangreatly increase the treatment speed, the power consumption of the system can be reduced by using the FPGA to treat, and the method has the advantages of larger use value and good application prospect.
Description
technical field [0001] The invention belongs to a radar signal processing method, and relates to a method for realizing a linear frequency modulation digital pulse compression system with a large time-width-bandwidth product in the frequency domain, specifically a processing method for an FPGA-based real-time digital pulse compression system. Background technique [0002] Pulse compression technology has become an important system of modern radar because it solves the contradiction between radar operating range and resolution. Most of the current digital pulse compression systems use the frequency domain processing method. The pulse compression processing requires a large amount of calculation and has high requirements for real-time performance. Generally, it is implemented with more DSP hardware platforms. The hardware system is complex and consumes a lot of power, so it is not easy to be widely used. Using FPGA to process radar pulse signals with large time-width-bandwidth...
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IPC IPC(8): G01S7/02
Inventor 赵小红杨达杨付飞
Owner HUBEI SANJIANG SPACE XIANFENG ELECTRONICS&INFORMATION CO LTD