HRR profiling in GMTI search radar

This paper presents a high range resolution (HRR) profiling technique for generating range and Doppler profiles of multiple moving targets, while the radar is in ground moving target indicator (GMTI) search mode. To implement such a technique, it requires no a priori information on target velocity and/or phase, hence, it is a good candidate to be incorporated into a search radar in which precise target velocity and/or phase information is generally not available. This technique was developed for a linear FM radar in which transmitting frequency is changing within the transmit pulsewidth. Most of the SAR radars employ such a waveform for both SAR imaging and GMTI modes. To verify HRR profiling performance, modeling, simulation, and key profiling equations were developed. Results show that both the resolution in Doppler and SIR value are improved. Also, this technique is capable of handling reasonable target acceleration of ground movers due to the inherent radar design.