GNSS Spoofing Interference Detection Based on Acquisition Results

GNSS spoofing interference is a major threat for satellite navigation systems. For meaconing attack, since the target receiver does not know the specific parameters of the interference, the existing single spoofing detection method cannot detect all spoofing interference, this paper proposed a combined algorithm for detecting spoofing interference in the capture stage. First, it used the joint signal-to-interference-and-noise ratio and multi-peak detection method to detect. If the captured peak exceeded a given threshold, there was a spoofing interference signal; if it did not exceed the given threshold, but if there were two peaks, the proposed code phase difference consistency method was used for detection, which avoided the impact of multipath signals on detection performance; when there was only one peak that did not exceed a given threshold, there may be overlap between the authentic signal and the spoofing interference signal, and at this time, it was further detected by the improved correlation function width threshold method. When there are two correlation peaks, the detection probability becomes higher and higher as the total power of the spoofed interference signal becomes smaller, indicating the effectiveness of the code phase difference consistency method; when there is a correlation peak, the detection probability is higher for meaconing interference signals at different hourly delays, indicating the effectiveness of the improved correlation function width threshold method.