Jamming suppression

Abstract

The vulnerabilities of GNSS systems expose them to impacts from various intentional and unintentional interferences. Of these various interferences, jamming is the most common type, which mainly includes narrowband jamming and wideband jamming. Even though GNSS adopts spread spectrum technology so that it has certain capability of interference mitigation, this capability is constrained by spreading gain. Usually the power of jamming is much larger than the power of the GNSS signal. Under these conditions, the jamming power, even after de-spreading, is still much larger than the signal power, and consequently a receiver cannot acquire GNSS signal.