DIGITAL INTERFERENCE SUPPRESSION SYSTEM FOR RADIO FREQUENCY INTERFERENCE CANCELLATION

摘要

A digital signal processing system that produces an adaptive cancellationarrangement which nulls out all types of concurrent interference and/orjamming signals received by Global Positioning System (GPS) or spread spectrumreceiver (7) from diverse antennas. In the present arrangement, orthogonalcomponents of the composite received signal are separated by the receiveantenna arrangement (3) and adjusted in the digital network (5) between theantenna (3) and the receiver (7) in phase and amplitude to optimally cancelcomponents. The arrangements can be synergistically combined with digitaladaptive transversal filter technology which is primarily used to supplementsuppression performance by reducing narrowband interference in the band. Theorthogonal received signal components from the GPS satellite constellation andfrom interference sources are combined in the present arrangement toadaptively create a null that attenuates interference sources while slightlymodifying the GPS received signals.