Method of resolving closely spaced targets

Claim 1

The method of operating a four quadrant monopulse radar, where the signals received at each quadrant are represented by A, B, C and D, to resolve two sources of received signals when such sources are within the sum beam of such radar, such method comprising the steps of: (a) separately quadrature detecting signals received at each one of the four quadrants to produce eight video signals, associated pairs of such signals being representative of the real and imaginary parts of a corresponding one of the signals A, B, C and D; (b) forming the monopulse ratios Y=[(A+C)-(B+D)]/(A+B+C+D), P=[(A+B)-(C+D)]/(A+B+C+D) and Δ=[(A+D)-(B+C)]/(A+B+C+D) and the monopulse sums, S=(A+B+C+D); (c) forming the complex conjugates Y*, P*, Δ* amd S*; and (d) processing the monopulse ratios Y, P, Δ and S along with the complex conjugate to solve the identity: r.sub.1 /r.sub.2 =1/2[(r.sub.1 +r.sub.2 ((r.sub.1 ±r.sub.2).sup.2)).sup.1/2 ] where r 1 is the yaw monopulse ratio of one of the sources of signals received and r 2 is the yaw monopulse ratio of the second of the sources of signals received.

Claim 2

The method of operating a four quadrant monopulse radar, where the signals received at each quadrant are represented by A, B, C and D, to resolve two sources of received signals when such sources are within the sum beam of such radar, such method comprising the steps of: (a) separately quadrature detecting signals received at each one of the four quadrants to produce eight video signals, associated pairs of such signals being representative of the real and imaginary parts of a corresponding one of the signals A, B, C and D; (b) forming the monopulse ratios Y=[(A+C)-(B+D)]/(A+B+C+D), P=[(A+B)-(C+D)]/(A+B+C+D) and Δ=[(A+D)-(B+C)]/(A+B+C+D) and the monopulse sums, S=(A+B+C+D); (c) forming the complex conjugates Y*, P*, Δ* amd S*; and (d) processing the monopulse ratios Y, P, Δ and S along with the complex conjugate to solve the identity: r.sub.1 /r.sub.2 =1/2[(r.sub.1 +r.sub.2 ((r.sub.1 ±r.sub.2).sup.2)).sup.1/2 ] where r 1 is the yaw monopulse ratio of one of the sources of signals received and r 2 is the yaw monopulse ratio of the second of the sources of signals received.