FMCW Frequency Modulated Continuous Wave radar interference cancellation algorithm based on beat signal characteristic for automotive vehicle

摘要

In a situation where a vehicle radar is used, interference occurs due to a radar signal transmitted by another vehicle. An interference signal may cause an error in the distance and velocity estimation of a target and may threaten the safety of a vehicle. Therefore, a technique for removing the interference signal is required for the vehicle radar. According to the present invention, in the FMCW radar, when an interference signal from another vehicle causes interference to an original signal, the FMCW radar detects an interference pattern and finds a section where the interference occurs. Since the interference signal has less signal attenuation than the original signal, signal intensity is high and an interference occurrence section has a high frequency component due to the nature of the interference signal. Taking this into consideration, two characteristics of the time sample of a signal received by the radar on a time axis are used to find out and remove the section where the interference occurs. A vehicle drive control system includes a FMCW radar device and an interference cancellation device.