Low-complexity traversal RAIM cheating prevention method and device for satellite navigation

Abstract

The embodiment of the invention provides a low-complexity traversal RAIM cheating prevention method and device for satellite navigation. The method comprises steps: S1, user-satellite pseudorange residual vector information is acquired, and based on the user-satellite pseudorange residual vector information, a detection statistic amount is obtained; S2, if the detection statistic amount is no smaller than a preset detection threshold, a first number of cheating signals are incrementally processed to obtain a second number of cheating signals; maximum likelihood estimation is carried out according to a third number of satellite signals and the second number of cheating signals, the signal information corresponding to the maximum probability result is determined, the signal information corresponding to the maximum probability result is used as cheating signals to be removed, and a fourth number of satellite signals are obtained; and S3, the step S1 and the step S2 are repeated until a preset condition is met. The method and the device have the capability of recognizing multiple cheating signals and can be applied to more cheating scenes, the amount of computation is small, and the implementation is simple.

Description

technical field [0001] The invention relates to the technical field of global navigation satellites, in particular to a low-complexity traversal RAIM anti-spoofing method and device for satellite navigation. Background technique [0002] Global Navigation Satellite System (GNSS) is widely used in transportation, energy, communication, agriculture and other fields. However, the open system structure of civilian signals and the very weak signal power when they reach the ground make GNSS receivers susceptible to spoofing interference when they are in use. GNSS spoofing refers to forging signals similar to real GNSS satellite signals so that user receivers can track the spoofed signals and generate wrong position or time information. Therefore, anti-spoofing measures need to be added to existing receivers. [0003] The existing anti-spoofing methods can be divided into signal design, external auxiliary and terminal processing. Signal design category includes spread spectrum c...

AI Technical Summary

Problems solved by technology

Signal design category includes spread spectrum code encryption, text encryption, etc., which need to be modified from the GNSS signal level, which is difficult to implement; external assistance category includes inertial navigation device assistance, high-precision clock assistance, communication module assistance, dual antennas and array antennas, and multi-antenna Receivers, etc., generally costly to implement

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