Signal processor of laser Doppler radar based on FPGA (field programmable gate array) and processing method

Abstract

The invention discloses a signal processor of a laser Doppler radar based on an FPGA (field programmable gate array), and relates to the field of radar signal processing. The signal processor comprises an ADC (analog to digital converter) sampling unit, a storage unit and an FPGA processing unit, wherein the FPGA processing unit comprises an ADC configuration module, a storage interface module, a sampled data receiving module, a data input module, an intermediate frequency wave trap module, a diploid down sampling module, an FFT (fast Fourier transform) module, a pulse accumulating module, a peak extracting and Doppler frequency output module and a control module. After electrification, the FPGA configures an ADC and waits an external trigger signal; after the signal is effective, the FPGA begins receiving data sampled by the ADC; and the sampled data are all stored in the storage unit for caching through the FPGA, and then are read in the FPGA from the storage unit to be subjected to processing. By using the signal processor, the characteristics of the FPGA are adequately utilized; the processing speed is quick; the structure is simple; the problems of intermediate frequency interference, large data size and the like when the laser Doppler radar is used for speed measurement are solved; and the cost and the complexity of the laser Doppler radar are controlled beneficially.

Description

technical field [0001] The invention relates to the field of radar signal processing, in particular to a signal processor and a processing method of an FPGA-based laser Doppler radar. Background technique [0002] Doppler radar is a radar that uses the Doppler effect generated by the relative motion between the radar and the target to detect the target, and the laser Doppler radar emits a laser signal. Compared with microwave radar, laser Doppler radar radar has the characteristics of shorter working wavelength and small beam divergence angle, and has extremely high angular resolution, distance resolution and Doppler speed measurement resolution. Using the laser Doppler radar can accurately measure the moving speed of the target object: the radar emits a pulse signal, and the signal has a Doppler frequency shift after returning from the target, and the target can be calculated by extracting the Doppler frequency from the echo speed. Whether the Doppler frequency can be ext...

AI Technical Summary

Problems solved by technology

As mentioned earlier, laser Doppler radar has a large amount of data and high real-time requirements, so it can only use multiple DSPs for parallel processing, which increases the complexity and power consumption of the system, reduces stability, and is not conducive to cost control

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