Patent ID: 8346174

Claim:
A system comprising: a sampling module configured to generate a plurality of samples of radio frequency signals on a first channel during each of a first period, a second period, and a third period, wherein the first period, the second period, and the third period do not overlap one another; a difference module configured to determine a first difference between i) a first count of polarity reversals during the first period and ii) a second count of polarity reversals during the second period, a second difference between i) the second count of polarity reversals during the second period and ii) a third count of polarity reversals during the third period, and a third difference between i) the first difference and ii) the second difference; and a third module configured to determine a frequency of the radio frequency signals based on at least one of the first count and the second count, determine a frequency variation of the radio frequency signals based on the first count and the second count, and identify a radar type of the radio frequency signals based on at least one of the third difference and the frequency variation.