Abstract:

The inherent delay-Doppler coupling in stepped-chirp radar has a severe impact on range and velocity measurement. Based on the analysis of its Doppler performance, the rough range is firstly achieved according to the sampling time and thus the rough velocity is gotten through the range-velocity coupling, which will be used in compensation for the quadratic item of echo phase. Then the waveform of frequency domain is analyzed to get the precise range of each scatter center, and finally the precise velocity is obtained. The new method of resolving the range-velocity coupling is analyzed in detail and the steps of range and velocity measurement based on frequency-domain waveform analysis are given. Simulation results prove that this method has a better performance at a high sampling rate and non-ambiguous velocity.