| Summary: | In order to achieve high resolution imaging with different distances, a target range direction detection system is designed and tested under the frequency modulated continuous wave(FMCW) circular scanning synthetic aperture radar(SAR) system. The system is realized by analog front end and FPGA, and various working modes are designed to realize three detecting ranges and corresponding resolutions in the near, middle and far distance. Through MATLAB the RF front-end de-chirped signals are simulated, loaded into the FPGA digital down conversion processing, and emulated to get output spectrum. Closed-loop board level measurement is carried out, and the feasibility of the target range direction imaging system is verified based on FMCW circular scanning SAR.
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