Inertial acceleration assisted receiver tracking loop algorithm

Abstract

The invention relates to an inertial acceleration assisted receiver tracking loop algorithm. According to the main technical characteristics, the method comprises the following steps that: frequency mixing is carried out on digital intermediate frequency signals to obtain homodromous I path signals and quadrature Q path signals; a homodromous advancing signal IE, a homodromous lag signal IL, a quadrature advancing signal QE and a quadrature lag signal QL pass through a code loop discriminator to obtain a code phase error, the code phase error is smoothed by a code loop filter, and the smoothed code phase error is added to faid / M so as to control a local C / A code generator in a feedback manner; a homodromous instant signal IP and a quadrature instant signal QP pass through a phase discriminator to obtain a loop phase error, the loop phase error is smoothed by a loop filter to obtain a carrier phase error, and the carrier phase error is added to faid to correct a local carrier generator. According to the invention, the dynamic stress borne by the loop is eliminated, the loop is enabled to realize stable tracking of a large dynamic environment under a small bandwidth, the dynamic performance of the loop is substantially improved, and the interference resistance of the loop is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of navigation, in particular to an inertial navigation acceleration-assisted receiver tracking loop algorithm. Background technique [0002] In a highly dynamic environment, the GNSS signal carrier frequency and code frequency will be affected by the carrier's higher velocity, acceleration, and jerk, resulting in a large Doppler frequency shift, Doppler frequency shift change rate, and Doppler frequency shift. rate of change. For ordinary receivers, the loop bandwidth must be increased in order to maintain loop lock. The increase of the loop bandwidth will introduce broadband noise, and when the noise level increases to a certain level, it will cause the loop to lose lock. In order to solve the problem of loop tracking under high dynamics, some scholars have proposed a carrier tracking algorithm using a second-order frequency-locked loop to assist a third-order phase-locked loop. The characteristic of thi...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to make up for the deficiencies of the prior art, provide an inertial navigation acceleration assisted receiver tracking loop algorithm, and solve the problem of conflicting dynamic performance and bandwidth requirements of the tracking loop

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