Higher Resolution in Range and Velocity for Automotive Radar

The state-of-the-art automotive radar with chirp sequence at 77GHz is dedicated to achieving higher resolution. The conventional resolution in range and velocity are restricted by the bandwidth and duration of the transmitted signal, respectively. In this paper, we propose a novel method based on compressed sensing (CS) improving the resolution in range and velocity simultaneously without the increase of bandwidth or duration. The proposed method includes three steps: sparse transformation, random sampling and reconstruction. And the Orthogonal matching pursuit (OMP) is adopted to recover the sparse signal. Simulations verify the effectiveness of the proposed method. And the performance under different conditions is tested also.

I. Introduction

The market for automotive radar based on 77GHz millimeter-wave (MMW) is gaining momentum [1]. The radar transmits either pulse wave or continuous wave, and the latter is preferred because of low power and cost. Moreover, the typical continuous waveform is chirp sequence that belongs to Linear Frequency Modulation Continuous Wave (LFMCW) [2], since the radar with chirp sequence can work in multi-targets scenario and the coupling between range and velocity of result can be neglected. Due to the ongoing of self-driving cars, higher resolution of automotive radar is required [3].