Nonlinear processing for enhanced delay-Doppler resolution of multiple targets based on an improved radar waveform

In this paper, an improved radar waveform scheme is put forward and a family of nonlinear processing methods is applied for enhanced delay-Doppler resolution in multiple targets scene. A double V-chirp waveform is first proposed to overcome the disadvantages of traditional V-chirp waveform used in the delay-Doppler resolution and detection. Then, a combined operation based on a family of nonlinear processing methods is employed to further enhance the delay-Doppler resolution. Next, a paraboloid function is given as a filter in order to raise the power of the non-center targets presented in the delay-Doppler maps while keeping the delay-Doppler resolution. Finally, numerical simulations in the paper prove the performance improvement of proposed waveform and methods. Besides, discussions about the most suitable chirps' number for the waveform, the influence of targets position and chirp rates chosen, and the design trade-off of double V-chirp waveform in hardware transmitting and detection performance loss are also illustrated in this section, which make the model adaptive to more complex situations.