GNSS vector tracking loop based on pre-filtering, and implementation method for GNSS vector tracking loop

Abstract

The invention discloses a GNSS vector tracking loop based on pre-filtering, and an implementation method for the GNSS vector tracking loop. The GNSS vector tracking loop comprises a carrier / code frequency correlator, an integration eraser, a C / A phase discriminator, a carrier frequency discriminator, an expanded Kalman filter, a navigation resolving module, an observation vector updating module and a code / carrier frequency predictor, wherein the carrier / code frequency correlator, the integration eraser, the C / A phase discriminator, the carrier frequency discriminator, the expanded Kalman filter, the navigation resolving module, the observation vector updating module and the code / carrier frequency predictor are sequentially in data connection. The code / carrier frequency predictor is in data connection with the carrier / code frequency correlator through the C / A phase discriminator and a carrier digital-controlled oscillator. The implementation method of the loop solves a problem that lock loss of a signal tracking loop appears in a conventional scalar quantity tracking mode under a high dynamic condition.

Description

【Technical field】 [0001] The invention belongs to the technical field of satellite navigation signal processing, and in particular relates to a GNSS vector tracking loop based on pre-filtering. 【Background technique】 [0002] The tracking method generally adopted by the existing GNSS receivers is scalar tracking, that is, each signal channel has two closed tracking loops (pseudo-code tracking loop and carrier tracking loop), and they are periodic in the form of closed-loop feedback. Continuous operation, so as to achieve continuous locking of the real-time pseudo-code phase and carrier Doppler frequency shift of the tracked satellite signal, and further output the measured value of the satellite, and extract the navigation message of the tracked satellite. In terms of signal processing, on the one hand, this method separates the N channels from each other for tracking and extraction of measurement values ​​and navigation messages. On the other hand, it separates "signal trac...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a GNSS vector tracking loop based on pre-filtering and its implementation method, to solve the problem that the signal tracking loop loses lock when the existing scalar tracking method occurs under high dynamic conditions

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