Patent ID: 8345597
Filing Date: 2013-01-01
Classification: G01S,H04W

Abstract:
1. A system of detecting a target transmitter located within an area of interest and transmitting a spread spectrum signal having an unknown spreading code, the system comprising: a first intercept receiver configured to provide a first directional receiving beam that is directionally oriented toward a selected portion of the area of interest; a second intercept receiver configured to provide a second directional receiving beam directionally oriented toward the selected portion of the area of interest; and a central control configured to direct the first and second intercept receivers to thereby coordinate the simultaneous orientation of the first and second directional receiving beams toward the selected portion of the area of interest, and to indicate that a target transmitter is located in the selected portion of the area of interest if the first and the second directional receiving beams both indicate the presence of the spread spectrum signal, the location of the target transmitter being within an intersection of the first and second directional receiving beams, wherein when neither the first nor the second receiving beams indicate the presence of a same spread spectrum signal of the central controller is configured to indicate the absence of a target transmitter at the intersection point of the first and second directional receiving beams; wherein the presence of the spread spectrum signal within the first and second receiving directional beams is determined by comparing second-order variations in autocorrelation functions associated with the first and second directional receiving beams to a threshold value.