Automotive radar interference study for different radar waveform types

Abstract

Mutual interference between different radar waveforms used in automotive radar applications is studied. The existing interference analysis is extended to a generalised radar‐to‐radar interference equation that covers most of the common interference scenarios for automotive radar systems. The outcome of the generalised equation is demonstrated for a number of typical scenarios where radars with different continuously transmitting waveforms are involved. The proposed equation can be used to characterise the received interference and its features by analysing the instantaneous beat frequency of the victim radar. Moreover, an interference analysis of phase‐coded frequency‐modulated continuous waveforms is performed and demonstrated experimentally by using real‐time automotive radars for the first time in the literature. The experimental results corroborate the interference analysis of different waveforms and validate the proposed generalised interference equation under various conditions.

Smoothed Phase-Coded FMCW: Waveform Properties and Transceiver Architecture

“…In addition, analyzing the spectrogram of the phasecoded signal is complementary as it provides an additional perspective that may not easily be seen on the signal's time or frequency domain representation. The instantaneous frequency for the BPSK code sequence can be written as [25] 1 2π…”

“…The most popular phase coding scheme used for PC-FMCW in the preliminary studies [21], [25] was binary phase shift keying (BPSK). The BPSK coding causes abrupt phase changes that lead to a large spectrum widening of the beat signal.…”

Smoothed Phase-Coded FMCW: Waveform Properties and Transceiver Architecture

“…In addition, analyzing the spectrogram of the phase-coded signal is complementary as it provides an additional perspective that may not easily be seen on time or frequency domain representation of the signal. The instantaneous frequency for the BPSK code sequence can be written as [25]:…”

“…The most popular phase coding scheme used for the PC-FMCW in the preliminary studies [21], [25] was the binary phase shift keying (BPSK). The BPSK coding causes abrupt phase changes that lead to large leakage of the BPSK spectrum outside of the 3-dB bandwidth.…”

Performance Analysis of Phase-Coded FMCW for Joint Sensing and Communication

“…Traditional autonomous driving systems utilize wireless sensors for vehicle-to-vehicle (V2V) communication and radar sensors for providing self-awareness about the environment. Sharing a limited radio frequency spectrum by numerous wireless devices raises a concern about spectral congestion [1,2]. Therefore, there is a growing interest towards joint sensing and communication systems to combine the functionalities of both of these sensors and reduce the spectrum crowding [3,4,5].…”