Patent ID: 7006039
Filing Date: 2006-02-28
Classification: H01Q,H04K,Y02A

Abstract:
1. A secure data transmission system for transmitting a data signal with high directivity toward a target while greatly reducing the likelihood of interception, comprising: (a) a self-phasing retrodirective array for receiving an interrogating signal from the target and transmitting a data signal beam with a peak directed back toward the target; and (b) a self-null-steering array for receiving the interrogating signal from the target and transmitting, in conjunction with said retrodirective array, a jamming signal with a null directed toward the target and the jamming signal in other directions, whereby the target can receive the data signal peak superimposed with the jamming signal null to maximize signal-to-noise (SNR) ratio in reception while the jamming signal is sent in the other directions.