Patent ID: 6400305
Filing Date: 2002-06-04
Classification: G01S

Abstract:
In a police radar detector adapted to detect police radar signals in the X, K and wide Ka police radar bands, a method of rejecting interfering signals operating within a frequency range adjacent to at least one of the X and K police radar bands, the method comprising:separately: sweeping the X police radar band and a frequency range adjacent to the X band with a first LO frequency, and outputting first pairs of IF signals being correlated to valid police radar signals in the X band and second pairs of IF signals being correlated to interfering signals in the adjacent frequency range; sweeping the K police radar band and a frequency range adjacent to the K band with a second LO frequency, and outputting first pairs of IF signals being correlated to valid police radar signals in the K band and second pairs of IF signals being correlated to interfering signals in the adjacent frequency range; and sweeping the wide Ka police radar band with a third LO frequency, and outputting first pairs of IF signals being correlated to valid police radar signals in a first portion of the wide Ka band and second pairs of IF signals being correlated to both valid police radar signals in a second portion of the wide Ka band and to interfering signals in said second portion; and rejecting as interfering signals those second pairs of IF signals output during said Ka band sweep which are harmonically related to at least one of the second pairs of IF signals from said X band sweep and said K band sweep.