Orthogonal double V-linear frequency modulation waveform for simultaneous polarimetric measurement and its non-linear processing

Abstract

It has become an interesting topic for modern radar possessing capabilities of polarimetric measurement, high-resolution imaging, and good delay-Doppler resolution. The linear frequency modulation (LFM) scheme is widely used in radar systems as it can achieve both high Doppler tolerance and resolution. Based on the LFM scheme, a novel waveform is proposed, namely, the orthogonal double V-linear frequency modulation (ODV-LFM), which exhibits the capability to mitigate the influence of delay-Doppler coupling and reduces the risk of false targets and ghosts in multiple-target scenes. Based on the ODV-LFM signal, a simultaneous polarimetric measurement method is proposed to obtain fully polarimetric information of the target. According to the unique chirp rate characteristic of the ODV-LFM signal, the pointwise linear and non-linear processing methods are proposed to enhance delay-Doppler resolution, suppress sidelobes, and achieve high-resolution imaging without substantially compromising the signal detection performance. Finally, simulated experiments are conducted to demonstrate the superiority of the proposed waveform and methods.