Abstract
Stepped frequency waveform (SFW) radars are used for synthesizing high range resolution profiles (HRRP). SFW radars suffer from strong range-Doppler coupling and are not robust to coexisting spectral interference. In this paper, we propose a new random, sparse step-frequency radar (RaSSteR) waveform to address these shortcomings. Unlike SFW where the carrier frequency is linearly increased over the available bandwidth, RaSSteR randomizes the frequency sequence to decouple range and Doppler. This new waveform also skips portions of the transmit spectrum without decreasing the range resolution and operates cognitively by focusing all its power in only a few frequencies. We derive theoretical guarantees which demonstrate that, even with few subpulses, RaSSteR has identical target recovery performance as the conventional random stepped frequency (RSF) waveform. Numerical experiments show that RaSSteR's target hit rate has a 30% improvement over the conventional RSF.
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