Design of Unimodular Long Length Polyphase Code for CW Radar for Doppler Tolerance

Abstract

Most of the Continuous Wave (CW) Radars use the FMCW modulation technique to determine the range. In addition, FMCW radar uses periodic sweep for practical implementations. However, there is an increased interest in the design of the CW radar using a suitable waveform of very large Time-Bandwidth (TB) product to overcome some of the perennial problems of CW radars namely, loss due to stretch processing and Range Doppler Coupling. In this work, a modern optimization method is used to design a new class of polyphase waveforms. It includes the design and simulation of uni-modular code based on Cyclic Algorithm New (CAN) algorithms. Further, we have compared CAN-based code with other popular codes such as m-sequence, random phase, and Golomb code based on performance metrics such as Peak Sidelobe Level(PSL), Integrated Sidelobe Level(ISL), and Doppler tolerance. It is found that the CAN can be used to design long length polyphase sequence with better sidelobe performance and Doppler Tolerance. © 2021 IEEE.