Optimization of low sidelobes radar waveforms: Circulating codes

This paper presents two techniques as well as their combination for optimization of the low side-lobes space-time waveforms: circulating LFM signals. Matched filtering is implemented for the pulse compression. The ambiguity functions of the modified waveforms are analyzed for demonstration of the optimization efficiency. The simulation results show that the proposed techniques decrease the range side-lobes, with no penalty on the signal-to-noise ratio, and restore the range resolution in the beam-formed angular direction where the circulating LFM signal previously had a resonance effect. Typical sidelobe levels lower than −50dB are demonstrated over the whole angular coverage, with an 8 element antenna and 256 length codes.