Patent ID: 6549158
Filing Date: 2003-04-15
Classification: F41G,G01S

Abstract:
In the receiver of a monopulse pulse radar wherein sum and difference signals having the same radio frequency are downconverted, normalized and detected, the improvement comprising the combination of:(a) first mixer and filter means for separately downconverting the sum and the difference signals to corresponding intermediate frequency signals at a first intermediate frequency; (b) second mixer and filter means for downconverting the intermediate frequency derived from the difference signals to a second intermediate frequency signal; (c) multiplexing means for combining the sum signals at the first intermediate frequency and the difference signals at the second intermediate frequency; (d) automatic gain control means, responsive to the sum signals out of the multiplexing means, for normalizing the sum and the difference signals out of such multiplexing means; (e) demultiplexing means for separating the normalized sum and difference signals; (f) third mixer and filter means, responsive to the normalized sum signals out of the demultiplexing means, for downconverting such signals to the second intermediate frequency; (g) filter and delay means, responsive to the normalized difference signals out of the demultiplexing means, for time multiplexing the normalized sum and difference signals; and (h) detection means for sequentially detecting the normalized sum and difference signals.