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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

A LFM-PD, radar signal technology, applied in radio wave measurement systems, instruments, etc., can solve the problems that the speed cannot reach real-time processing, is not suitable for large-scale radar detection systems, etc., to shorten the development cycle, strong flexibility and Adaptive, high-range resolution effects

Inactive Publication Date: 2014-04-09
BEIHANG UNIV
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AI Technical Summary

Problems solved by technology

[0005] In the above-mentioned method for realizing real-time processing of intermediate frequency LFM-PD radar, it is easy to develop using PC software to realize digital down-conversion and pulse compression, but the speed usually cannot meet the requirements of real-time processing, and it is not suitable for large-scale radar detection systems

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  • 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
  • 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
  • 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

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Embodiment Construction

[0030] The invention adopts direct intermediate frequency quadrature sampling and digital pulse pressure mode, so as to realize fast pulse compression. Schematic as figure 1 and figure 2 shown. The principle diagram of the digital down-conversion of the present invention is as follows figure 1 As shown, in a digital signal processing system, it is usually necessary to convert the received intermediate frequency signal into a digital baseband signal represented by two channels of I and Q through quadrature sampling for processing. In order to avoid the I / Q channel inconsistency caused by quadrature sampling in the conventional analog domain, direct intermediate frequency sampling is used in this processor. Through direct intermediate frequency sampling and extraction, the influence of the DC drift of the pre-amplifier on the accuracy of the back-end signal processing is avoided, and a higher image frequency rejection ratio is obtained.

[0031] exist figure 1 In the process...

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Abstract

The invention discloses an 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 a method for realizing the system. The system consists of an intermediate frequency sampling module, a digital down-conversion module, a pulse compression module, a coherent accumulation module, a motion compensation module and a constant false alarm detection module. A processed radar signal enters the intermediate frequency sampling module at first; the dispersed signal is sent into the digital down-conversion module for digital down-conversion processing; then the signal enters the pulse compression module for pulse compression processing; after the coherent accumulation module accumulates out a result, the signal enters the motion compensation module to calculate the motion compensation quantity; and finally, the coherent accumulation result enters the constant false alarm detection module to detect out an object. The intermediate frequency LFM-PD radar signal real-time processing system based on FPGA and DSP can meet real-time processing requirements, is short in development cycle and strong in flexibility, and is suitable to be applied to large-scale radar detection systems.

Description

technical field [0001] The invention relates to an intermediate frequency LFM-PD (linear frequency modulation-coherent) radar signal real-time processing system and processing method based on FPGA and DSP, belonging to the technical field of radar detection. Background technique [0002] Radar is the primary tool for detecting targets in both military and civilian applications. When there is relative motion between the radar and the target, there will be a frequency difference proportional to the relative radial velocity between the frequency of the echo signal and the frequency of the transmitted signal, which is the embodiment of the Doppler effect. The radar that uses the Doppler effect to extract and process target information is called Doppler radar. If the radar emits a pulse-modulated radio frequency signal, it is called pulse Doppler radar, or PD radar for short. PD radar is an advanced fully coherent pulse radar developed on the basis of moving target display radar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/32
Inventor 王俊毕严先张玉玺
Owner BEIHANG UNIV
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