METHOD AND APPARATUS FOR ON-DEMAND INTERFERENCE REJECTION IN MULTI-BAND GNSS RECEIVERS

摘要

In general, the present invention relates to an adaptive IF filter for a multiband receiver. According to certain aspects, the adaptive IF filter can be dynamically configured as a low-pass architecture or a complex band-pass architecture. According to further aspects, the adaptive IF filter enables a wideband receiver which can simultaneously receive multiple frequency bands, but still protect itself from close-in or in-band jammers by selecting a single frequency band or subset of frequency bands. This retains the multiband functionality of the receiver under nominal conditions, which is traded off dynamically for a single-frequency-band with high jammer resistance under severe jamming conditions. According to still further aspects, the approach of the invention is particularly useful for GNSS receivers, since unlike a cellular transceiver, a temporary loss of signal is not catastrophic to GNSS receivers due to the long integration times.

主权项

1. An IF filter for a multiband GNSS receiver, comprising:
a wideband filter that passes a plurality of signals from different GNSS systems; and cross-coupling elements that convert the wideband filter into a narrowband complex band-pass filter that passes fewer than the plurality of signals.