Patent ID: 7330149

Claim:
A method for locating multiple angle sources using a monopulse radar comprising the steps of: (a) receiving a composite radio frequency (RF) signal which includes a first RF signal reflected from a dominant target and a second RF signal from a secondary target, wherein said monopulse radar receives said composite RF signal; (b) calculating a voltage amplitude S 1 for said first RF signal across a sample size wherein said voltage amplitude S 1 for said first RF signal is calculated by finding a maximum automatic gain control (AGC) power level across said sample size and a minimum AGC power level across said sample size, and then adding said maximum AGC power level to said minimum AGC power level to determine said voltage amplitude S 1 ; (c) calculating a voltage amplitude S 2 for said second RF signal across said sample size wherein said voltage amplitude S 2 is calculated by subtracting said minimum AGC power level from said maximum AGC power level; (d) looping across a preset number of samples obtained from said sample size to find a beat pattern for said first and second RF signals which are competing with each other; (e) locating nulls in said beat pattern caused by a destructive interference between said first RF signal and said second RF signal; (f) calculating a pitch angle and a yaw angle for said first RF signal wherein said pitch angle and said yaw angle for said first RF signal are calculated within a beat period between adjacent nulls in said beat pattern; and (g) calculating a pitch angle and a yaw angle for said second RF signal wherein said pitch angle and said yaw angle for said second RF signal are calculated within the beat period between said adjacent nulls in said beat pattern.