Anti-jammer pre-processor

Details Anti-jammer pre-processor Anti-jammer pre-processor

2005-01-18

2005-01-18

Phan, Dao (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Utilizing correlation techniques

C342S016000, C455S063100, C455S114200

Reexamination Certificate

active

06844850

ABSTRACT:
A blind anti-jammer pre-processor for detecting and alleviating the performance degradation due to strong jammers is disclosed. The anti-jammer pre-processor comprises a jammer detector (10) determining strong jammers based on the eigen-value spread associated with the received data correlation matrix, and an optimal combiner (12) producing nulls for suppressing the detected strong jammers and a main-beam for receiving Signals-of-interest (SOI). The present invention also discloses a GPS receiver comprising the anti-jammer pre-processor (32), a correlator (34), a phase compensator (36), and a hard decision detector (38). The outputs of the anti-jammer pre-processor (32) are sent to the correlator (34) to restore the bit stream. The predetermined 8-bit preambles in the first word associated with each subframe of GPS data are used to estimate the phase rotation introduced by the optimal combiner performed on the SOI.

REFERENCES:
patent: 4672378 (1987-06-01), Drabowitch et al.
patent: 6486828 (2002-11-01), Cahn et al.
patent: 6598014 (2003-07-01), Rabideau et al.
patent: 6687492 (2004-02-01), Sugar et al.
patent: 20020051433 (2002-05-01), Affes et al.
patent: 20040028013 (2004-02-01), Fitton et al.

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