A phase-locked loop tracking method, phase-locked loop, terminal and computer-readable medium

Abstract

The invention provides a phase-locked loop tracking method, comprising the steps of: (1) receiving an input signal; (2) mixing the input signal with a local carrier, and after integration-cleaning of the coherent integration time, the kth coherence is obtained Integral result I Pk and Q Pk (3) Calculating the coherent integration results of the I road and the Q road within the k-(N-1) time to the k-1 coherent integration time: and calculating the k-(N-1) time to the k-th time The coherent integration result of the I road and the Q road within the coherent integration time: (4) input the result in the step (3) to the phase detector to obtain the first phase detection result φ e(N‑1)m and the second phase discrimination result φ eNm (5) Calculate the average carrier frequency error f within the kth coherent integration time according to formula a ek (6) obtain the average carrier frequency error f of the k-(N-1) time to the (k-1) time coherent integration time e(k‑(N‑1)) ~ f e(k‑1) , get the compensated carrier phase measurement value according to formula b. (7) The oscillator receives the compensated carrier phase measurement value to update the local carrier oscillation frequency.

Description

technical field [0001] The invention relates to the technical field of GNSS, in particular to a phase-locked loop tracking method, a phase-locked loop, a terminal and a computer-readable medium. Background technique [0002] At present, the GNSS field is becoming more and more popular. In actual work, in the process of receiving and processing GNSS signals, at least one of the following problems exists: long coherent integration time can reduce signal-to-noise bandwidth, improve signal-to-noise ratio, and then improve signal tracking sensitivity, but long coherent integration time will lead to relatively low Large frequency error loss. In addition, the longer carrier oscillator update period increases the frequency error loss and affects the accuracy of phase detection measurement results. At the same time, the decrease in loop bandwidth results in poor dynamic adaptability of the carrier tracking loop. Contents of the invention [0003] In view of this, the present inven...

AI Technical Summary

Problems solved by technology

In actual work, in the process of receiving and processing GNSS signals, at least one of the following problems exists: long coherent integration time can reduce signal-to-noise bandwidth, improve signal-to-noise ratio, and then improve signal tracking sensitivity, but long coherent integration time will lead to relatively low Large frequency error loss. In addition, the update cycle of the carrier oscillator becomes longer and the additional frequency error loss affects the accuracy of the phase detection measurement results. At the same time, the reduction of the loop bandwidth causes the dynamic adaptability of the carrier tracking loop to deteriorate.

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