Texas Instruments Incorporated
FREQUENCY MODULATED CONTINUOUS WAVE RADAR SYSTEM WITH INTERFERENCE MITIGATION

Abstract:

A method for dithering radar frames includes determining at least one of a chirp period Tc for radar chirps in a radar frame and a chirp slope S for radar chirps in the radar frame. In response to determining the chirp period Tc, a maximum chirp dither .DELTA.c(max) is determined, and for the radar frame N, a random chirp dither .DELTA.c(N) between negative .DELTA.c(max) and positive .DELTA.c(max) is determined. In response to determining the chirp slope S, a maximum slope dither .PSI.(max) is determined, and for the radar frame N, a random slope dither .PSI.(N) between negative .PSI.(max) and positive .PSI.(max) is determined. A radar sensor circuit generates radar chirps in the radar frame N based on the at least one of (1) the chirp period Tc and the random chirp dither .DELTA.c(N) and (2) the chirp slope S and the random slope dither .PSI.(N).