Research of Detection Technique of Navigation Signals Evil Waveform

The detection of navigation signals evil waveform based on multicorrelator is an important issue of GNSS integrity monitoring. This paper defines the effect of 2nd-order step threat model of evil waveform on the code tracking loop, analyzes the multicorrelator technique of detection system based on Local/Wide Area Augmentation System (LAAS/WAAS). From the perspective of simplifying ground integrity channel and shortening the time consumption, this paper puts forward a new technique based on satellite autonomous integrity monitoring. The simulation of the detection capability and efficiency result in a 0.3 Tc decrease of the detection deviation of the technique based on SAIM with a 20 dB increasing of SNR over the technique based on LAAS, which makes a great significance of integrity monitoring.