Satellite navigation receiver carrier loop tracking device in high dynamic environment

Abstract

The invention discloses a satellite navigation receiver carrier loop tracking device in a high dynamic environment, which comprises a discriminator, a loop filter, a numerically-controlled oscillator and an open loop acceleration estimator, wherein the discriminator is used for generating a phase difference or a frequency difference between a receiving signal after stripping a pseudo code and a local reproduction carrier signal, and sending the phase difference or the frequency difference to the loop filter; the loop filter is used for generating a receiving signal speed estimation value and an acceleration estimation value according to output of the discriminator; the numerically-controlled oscillator is used for acquiring frequency of the local reproduction carrier signal according to output of the loop filter, generating a local reproduction carrier signal and inputting the signal to the discriminator; and the open loop acceleration estimator is used for estimating a Doppler frequency change rate of the receiving signal and assigning the Doppler frequency change rate to the loop filter. The loop has a strong high dynamic signal tracking ability, the loop performance can be effectively improved, and when the receiving signal has an acceleration of tens of g and even hundreds of g or the receiving signal has a large dynamic change, the receiving signal can be tracked.

Description

Technical field [0001] The invention relates to a carrier loop tracking device of a satellite navigation receiver in a high dynamic environment. Background technique [0002] In the current high-dynamic receiver scheme, the tracking of the high-dynamic signal is mainly achieved by optimizing the loop parameters and changing the discriminator structure. The method of optimizing the loop parameters generally improves the dynamic performance of the loop by using a larger loop bandwidth; the method of changing the discriminator structure generally improves the loop by increasing the traction range of the discriminator, using a frequency discriminator instead of a phase discriminator, etc. Road dynamic performance. The above two types of methods can improve the loop tracking ability of high dynamic signals to a certain extent, but when the received signal has an acceleration of tens of g or even hundreds of g, or the received signal has a large dynamic change (such as sudden accelera...

AI Technical Summary

Problems solved by technology

The above two types of methods can improve the ability of the loop to track high dynamic signals to a certain extent, but when the received signal has an acceleration of tens of g or even hundreds of g, or the dynamic change of the received signal is large (for example, the acceleration is sudden in a short period of time) increase or decrease), it is difficult to track the received signal

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