Interference cancellation system for global positioning satellit

Details Interference cancellation system for global positioning satellit Interference cancellation system for global positioning satellit

1996-02-28

1998-01-27

Blum, Theodore M.

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

Directive

Including polarized signal communication transmitter or...

342372, 342373, 342364, H01Q 2106, H01Q 2124, H04B 710

Patent

active

057126410

ABSTRACT:
An adaptive polarization cancellation arrangement which nulls out all types of concurrent interference signals received by a Global Positioning System (GPS) receiver from antenna mainlobe and sidelobe situated sources. The orthogonally polarized components of the composite received signal are separated by the receive antenna arrangement and adjusted in the polarization feed adapter network between the antenna and GPS receiver to optimally cancel components. The antenna and installation arrangement creates a polarization filter relative to interference sources which changes their apparent polarization orientation and supports adaptive discrimination based on dissimilar polarization characteristics relative to the desired signals. The orthogonal received signal components from the GPS satellite constellation and from interference sources are combined to adaptively create cross-polarization nulls that adequately attenuate interference sources while slightly modifying the GPS received signals. The present network can also improve GPS signal levels and signal to noise ratio by polarization optimization or matching in noninterference environments.

REFERENCES:
patent: 3421691 (1969-01-01), Brown et al.
patent: 3883872 (1975-05-01), Fletcher et al.
patent: 4283795 (1981-08-01), Steinberger
patent: 5298908 (1994-03-01), Piele
patent: 5485485 (1996-01-01), Briskman et al.
patent: 5515057 (1996-05-01), Lennen et al.

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