Vector tracking method of GPS receiver

Abstract

The invention discloses a vector tracking method for a GPS receiver. The steps are as follows: use the scalar tracking result to initialize the vector tracking loop, including the initial position, speed, clock difference, clock drift and satellite ephemeris of the receiver; Calculate the carrier and code NCO prediction parameters of the position, velocity, clock error, clock drift and satellite ephemeris; the output of the carrier frequency discriminator and code ring discriminator is used as the measurement information of the navigation filter to estimate the receiver's position, velocity, Clock difference and clock drift error, use the estimated information to correct the receiver position and velocity, and then use the corrected receiver position and velocity combined with the satellite ephemeris to calculate the carrier and code NCO to keep track of the input signal. The method of the present invention has good navigation accuracy and tracking performance, and at the same time has an excellent ability to instantaneously bridge the blocked signal, and can maintain good pseudo-code phase and carrier frequency tracking performance in an environment with a low carrier-to-noise ratio, and has broad application prospects .

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a vector tracking method of a GPS receiver. Background technique [0002] GPS is a space-based radio navigation system developed by the US Department of Defense, which has the characteristics of all-weather, high-precision, and all-time. Users all over the world only need to use the receiver to receive the signals of at least 4 navigation satellites at the same time to obtain their own position, speed and time information in real time. At present, GPS has been widely used in weapon guidance, vehicle navigation, geodetic surveying, etc., and even in earthquake prediction, weather forecasting, etc. [0003] At present, the mature technologies mainly used at home and abroad are scalar tracking loops based on phase-locked loop technology, and the channels are independent of each other, but the effect is not good in high dynamic and weak signal environments. The scalar ...

AI Technical Summary

Problems solved by technology

[0003] At present, the mature technologies mainly used at home and abroad are scalar tracking loops based on phase-locked loop technology. The channels are independent of each other, but the effect is not good in high dynamic and weak signal environments.

The scalar tracking loop is easy to lose lock in the high dynamic environment, and cannot track the signal stably in the weak signal environment

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