Loop tracking method and system.

Abstract

The invention provides a loop tracking method and system. The method includes the following steps that: received satellite signals are converted to digital intermediate-frequency signals; the coherent integral values of an instant branch, a lead branch and a lag branch are calculated according to the digital intermediate-frequency signals; the coherent integral values of the instant branch is inputted into a carrier loop phase discriminator, the coherent integral values of the lead branch and the lag branch are inputted into a code loop phase discriminator; a linear state equation is established, and results outputted by the carrier loop phase discriminator and the code loop phase discriminator are adopted as observation vectors, and Kalman filtering is performed on the observation vectors. According to the loop tracking method and system of the invention, the Kalman filtering and the traditional tracking loops are coupled; the output of the code loop phase discriminator and the carrier loop phase discriminator is adopted as an integrated body so as to be subjected to adaptive processing; dynamic adjustment of loop noise bandwidth can be realized, and the loop noise bandwidth can be adjusted in real time adaptively with the change of an environment; the advantages of the Kalman filtering in dynamic data processing can be given to full play; higher-accuracy of positioning and navigation can be achieved in a high-dynamic environment.

Description

Technical field [0001] The invention belongs to the field of satellite navigation applications, and particularly relates to a satellite signal loop tracking method and system that can be used in a high dynamic environment. Background technique [0002] With the development of national defense and military, the dynamics of advanced weapons and equipment such as missiles and fighters are getting higher and higher, which makes it impossible for traditional GPS receivers to navigate and locate them. The existing loop tracking scheme must be improved. In a high dynamic environment, the receiver and the satellite have relatively large relative speeds, accelerations and even jerk. For example, the overload capacity of close-range combat bombs can reach 40g, that of medium-range bombs is about 20g, and cruise missiles are about a few g. [0003] In the above-mentioned high dynamic environment, the GPS signal received by the GPS receiver contains a large Doppler frequency shift and its rate...

AI Technical Summary

Problems solved by technology

[0005] For this reason, the object of the present invention is to: provide a kind of satellite signal loop tracking method and system that can be used in high dynamic environment, solve traditional GPS receiver and can't realize stable and effective satellite signal loop tracking in high dynamic environment, Thus, the defects of positioning and navigation cannot be realized

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