Patent ID: 7606290
Filing Date: 2009-10-20
Classification: H04B

Abstract:
1. A system for low probability of detection (LPD) signal acquisition comprising: a receiver receiving a transmitted signal, said transmitted signal comprising: a subset of a collection of sequences (S said receiver having a acquisition signal processing block, said acquisition signal processing block comprising a finite collection of range subsets (R said acquisition signal processing block searches to acquire said transmitted signal over a range of arrival times bounded by the propagation time of the transmitted signal and any time error between the receiver and a transmitter transmitting said transmitted signal, said range of arrival times defined by said range subsets, said acquisition signal processing block searches to acquire one of said sequences in said collection of sequences during a portion of time defined by a predetermined range subset, said acquisition signal processing block employs a cyclic range search to periodically search for said one of said sequences during a repeating range of said finite collection of range subsets, said acquisition signal processing block, during acquisition of said transmitted signal, proceeds to the next range subset in said finite collection of range subsets, whenever the one of said sequences is not found by said acquisition signal processing block during a predetermined elapsed time, and repeats this procedure until the one of said sequences is found during a range of arrive times defined by a predetermined range subset associated with said one of said sequences.