Linear frequency modulation signal generation method based on extensible processing platform and transceiving system

Abstract

The invention provides a linear frequency modulation signal generation method based on an extensible processing platform. The linear frequency modulation signal generation method comprises the steps that a programmable logic end of the extensible processing platform receives a control instruction of a synthetic aperture radar system; the programmable logic end analyzes the control instruction to determine a waveform parameter, and sends the waveform parameter to a processing system end of the extensible processing platform; the processing system end calculates frequency modulation waveform data according to the waveform parameters and transmits the frequency modulation waveform data back to the programmable logic end; the programmable logic end buffers and reads the frequency modulation waveform data; according to a trigger signal of the synthetic aperture radar system, the programmable logic end sends the read frequency modulation waveform data to a data analog converter; and the data analog converter generates a linear frequency modulation signal according to the frequency modulation waveform data. The invention also provides a transceiving system, which comprises a low-frequency interface, an extensible platform, a cache unit, a data analog converter and a trigger signal acquisition unit.

Description

technical field [0001] At least one embodiment of the present disclosure relates to a method for generating a chirp signal applied to a synthetic aperture radar, and in particular to a method for generating a chirp signal based on an extensible processing platform and a transceiver system. Background technique [0002] Synthetic aperture radar achieves high resolution by transmitting linear frequency modulation signals and performing pulse compression. Due to the movement of the radar platform, the azimuth also has the form of linear frequency modulation signals. After focusing and post-processing, the high resolution of the azimuth direction is obtained. Therefore, the linear frequency modulation signals are synthetic aperture signals. Fundamentals of radar imaging. [0003] In the traditional design, it is mainly implemented based on the FPGA system, and the chirp signal is generated by means of a look-up table. It is necessary to complete waveform simulation, calculation...

AI Technical Summary

Problems solved by technology

First, every time the operating mode of the SAR system is modified, the waveform needs to be recalculated, and the waveform data stored in the Flash chip needs to be updated; second, the FPGA program, etc. read and write the Flash chip, or remove the Flash chip The chip stores data through a dedicated Flash device; third, system generation or compensation of waveform data, FPGA development and debugging, and Flash data programming all require corresponding debugging software, which increases the difficulty of debugging

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