Anti-inference method based on vector tracking loop

Abstract

The invention relates to the field of satellite navigation, in particular to a global position system (GPS) receiver anti-interference method based on a vector tracking loop. The anti-inference method based on the vector tracking loop includes inputting signals into a C / A code phrase discriminator and a carrier wave frequency discriminator at a k moment, obtaining a pseudo-range error which is tested by a receiver and a pseudo-range rate error which is tested by the receiver, estimating a real pseudo-range error and a real pseudo-range rate error between a carrier and a satellite at a k+1 moment; calculating a position error and a speed error of the receiver at the k+1 moment, obtaining position and speed of the carrier at the k+1 moment and updating a unit observation vector. The anti-inference method based on the vector tracking loop utilizes a method that various track channels distribute various weight coefficients, enables channel information with a high signal to noise radio to assist channel information with a low signal to noise radio, improves the whole tracking ability of the tracking loop and inhibits influence of interference signals on the tracking loop.

Description

technical field [0001] The invention relates to the field of satellite navigation, in particular to an anti-jamming method for a GPS (Global Positioning System) receiver based on a vector tracking loop. Background technique [0002] In the traditional GPS receiver tracking loop, each channel tracks a satellite, and each tracking channel works independently of each other, and the information between the channels cannot communicate with each other. Such a tracking loop is usually called a scalar tracking loop. road. The hardware structure of GPS receiver scalar tracking loop is easy to realize and the algorithm is simple, so it is widely used in practice. [0003] Xie Gang introduced the traditional GPS receiver tracking loop in detail in the book "GPS Principles and Receiver Design" (Electronics Industry Press. Beijing. 2009). Its working principle is: the intermediate frequency signal received by the receiver is first compared with The carrier ring replicated by the carrie...

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Problems solved by technology

At the same time, the signal with too low power may also affect other useful signals. It is necessary to set the signal power threshold in the filter to filter out the signal with too low power.

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