Vector tracking method based on carrier frequency assisted phase

Abstract

The invention relates to the field of GPS signal tracking in a highly dynamic environment and specifically relates to a vector tracking method for performing comprehensive processing on the medium-frequency signals of various channels of a receiver by use of a centralized filter in such a manner of a frequency locked loop assisted phase locked loop instead of a traditional single tracking loop. The vector tracking method comprises (1) frequency mixing, (2) correlator and discriminator outputting, (3) centralized filtering, and (4) vector tracking based on a carrier frequency assisted phase. The FLL assisted PLL manner is adopted in each tracking channel of the receiver to reduce the output error of the discriminator; comprehensive processing is performed on the measured value information in the various tracking channels by use of the centralized filter; the speed error at the moment K+1 is output by the filter and converted to obtain a carrier frequency corrected value and a code frequency corrected value at the moment K+1; next, the carrier frequency corrected value and the code frequency corrected value are fed back to a carrier voltage-controlled oscillator to regulate local multiple carrier signals.

Description

technical field [0001] The present invention relates to the field of GPS signal tracking in a highly dynamic environment, in particular to a way of using a frequency locked loop (Frequency Locked Loop, FLL) to assist a phase locked loop (Phase Locked Loop, PLL) to replace the traditional single tracking loop, through a centralized The filter is a vector tracking method for comprehensively processing the intermediate frequency signals of each channel of the receiver. Background technique [0002] The Global Positioning System (GPS) receiver mainly completes two important tasks: satellite signal capture and tracking and navigation solution. Traditional GPS receivers use independent tracking channels to track different visible satellites, and separate FLL and PLL cannot meet the requirements of high dynamics and tracking accuracy at the same time. Aiming at the problem of GPS signal tracking in a high dynamic environment, Roncagliolo et al. proposed a frequency-assisted PLL ph...

AI Technical Summary

Problems solved by technology

[0005] The information fusion method is a key technical issue based on the carrier frequency assisted phase vector tracking method. Since the system uses the vector tracking method to comprehensively process the information of each tracking channel, the amount of real-time calculation data is large, and the requirements for the processor are high. The increase of dimensionality will increase the complexity of processing information and system modeling

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