Chirp step-frequency moving object echo real time digital generation methods

Chirp step-frequency waveform is a new high range resolution (HRR) radar signal, which has the ability to get HRR under low instantaneous signal processing bandwidth. But the matted coupling of time-delay and phase-shift demands that echo modeling has quite accurate delay and phase characteristics, which result in huge computing quantities and become a technical difficult problem of signal processing and echo-simulation. Based on a HRR radar's design the paper put forward two real time digital generation methods based on SHARC: one is derived from signal subsection decompose and modified least square method (MLSM) and another is a method based on iteration for rectilineal object track, which are proved to be feasible and also provide new resolutions for digital generation of wide band radar signal.