Antenna nulling system for suppressing jammer signals

Details Antenna nulling system for suppressing jammer signals Antenna nulling system for suppressing jammer signals

1999-04-14

2000-10-10

Issing, Gregory C.

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

Directive

Utilizing correlation techniques

G01S 316

Patent

active

061306436

ABSTRACT:
An antenna nulling system (28) for nulling a jamming signal having a multibeam antenna (48), a correlator (72), and antenna pattern calculator (94), a sequential updater (90) and a beamformer (70) is provided. The multibeam antenna (48) includes a plurality of antenna elements (50) and is operable to receive the plurality of signals. The correlator (72) is operable to receive at least one sample signal from one of the antenna elements (50) and a composite signal from the plurality of antenna elements (50). The correlator (72) determines a cross-correlation of the sample signal and the composite signal. The antenna pattern calculator (94) calculates a difference in pattern magnitude of an adapted antenna pattern and a quiescent antenna pattern of the multibeam antenna (48). The sequential updater (90) sequentially calculates a new weight for each of the antenna elements (50) based upon an existing weight of each antenna element (50), the cross-correlation and the difference in pattern magnitude. The beamformer (70) is in communication with the multibeam antenna (48) and the sequential updater (90) to combine a new weight for each of the antenna elements (50) with the plurality of signals received from the multibeam antenna (48) to null the jamming signal.

REFERENCES:
patent: 4278978 (1981-07-01), Easterling et al.
patent: 4635063 (1987-01-01), Chang et al.
patent: 5175558 (1992-12-01), DuPree
patent: 5493307 (1996-02-01), Tsujimoto

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