Continuous coded waveforms for noise radar

Abstract

This paper describes a new class of continuous waveforms for noise radar that can be processed using earlier developed methods for reducing pulse compression sidelobes and equalizing compressed pulses before Doppler filtering. The proposed waveforms are based on codes that modulate sub-pulses which define the bandwidth of the waveform. For constant amplitude waveforms the codes are phase codes and the sub-pulses can consist of rectangular pulses with constant phase or linear phase. The proposed waveforms use many short codes to produce a code with a length that is the product of the shorter code lengths. The resulting long code can be arbitrarily long by introducing new shorter codes iteratively. The codes can be random or deterministic with low mismatch losses in the processing at the expense of a quasi-periodic but unpredictable waveform.