ANALYSIS, DETECTION AND MITIGATION OF INCAR GNSS JAMMER INTERFERENCE IN INTELLIGENT TRANSPORT SYSTEMS

Abstract

Satellite navigation signals have interference protection to some degree due to their spread spectrum code structure. However, since signals transmitted from satellites reach the receiver antenna with a very low signal power, buried in noise, they are vulnerable to interference. Interference sources like in-car jammers block the navigation signal reception in their vicinity and degrade positioning performance, proportional to the distance, over a wide area. As novel and innovative transport systems rely on a precise and reliable position determination, the threat of interference should not be underestimated. The work presented in this paper analyses the interference caused by malicious use of in-car jammers and proposes techniques to mitigate the jammer. After detection of the jammer signal within the GNSS receiver, the jammer can be mitigated in a first step at the receiver by excision of the jamming signal from the IF sample stream and further initiating the mitigation of the interference at the source by means of reporting of the interference event to authorities.