A GNSS anti-spoofing loop tracking method based on inertial information assistance and parameter estimation

Abstract

The invention provides a GNSS (global navigation satellite system) anti-spoofing loop tracking method based on inertial information aiding and parameter estimation. The GNSS anti-spoofing loop tracking method comprises the following steps of performing exploring study on the application of a signal estimation algorithm in an anti-spoofing field; utilizing a signal estimation algorithm to estimate a similar GNSS signal, identifying by aiding with the inertial information, and integrating the information to distinguish a spoofing signal and a true signal. The signal estimation algorithm is aided by the inertial navigation information, so as to propose a new tracking loop structure, thereby realizing double advantages of more reference for the tracking loop, and relative independence of the GNSS and an inertial navigation system. The GNSS anti-spoofing loop tracking method has the advantages that one set of complete anti-spoofing plan integrating signal estimation and detection, spoofing signal inhibition and true signal tracking is realized, and the spoofing interference can be inhibited to ensure the accuracy and stability of a receiver in working.

Description

technical field [0001] The invention belongs to the field of deception signal detection, and in particular relates to a GNSS anti-spoofing loop tracking method based on inertial information assistance and parameter estimation. Background technique [0002] GNSS (Global Navigation Satellite System) spoofing jamming can deceive satellite navigation system receivers in the case of low transmission power, which poses a greater threat to the application of my country's Beidou navigation system and other satellite navigation systems. Therefore, how to ensure that the satellite navigation system can still play a role in the case of malicious interference is an urgent problem to be studied and solved. The development of anti-spoofing technology has gone through three stages: "spoofing system verification and impact analysis", "spoofing signal detection" and "spoofing signal suppression". [0003] In the stage of "deception system verification and impact analysis", the current struc...

AI Technical Summary

Problems solved by technology

When the delay difference between the spoofed signal and the real signal is less than 1 chip, the CADLL will degenerate into a normal DLL loop and cannot track the real signal and the spoofed signal separately

However, the algorithm is currently only applied to multipath suppression, and necessary optimizations have been made according to the characteristics of multipath signals. However, although spoofing signals and multipath signals have similarities, there are more obvious differences. Therefore, it is necessary to Its application in the field of anti-spoofing has been greatly improved

[0006] In general, a large number of anti-spoofing technologies are mainly aimed at the detection of spoofed signals, and the research on how to make GNSS receivers not or less affected by spoofed signals and continue to track real signals is relatively insufficient

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