Adaptive tracking method for receiver in high-dynamic environment

Abstract

The invention discloses an adaptive tracking method for a receiver in a high-dynamic environment. According to the adaptive tracking method, bandwidths of loop filters for a frequency-locked loop, a phase-locked loop and an auxiliary phase-locked loop of the frequency-locked loop are adjusted by detecting the dynamic property and the signal-to-noise property of tracking signals of the receiver in real time, so that optimum values of the bandwidths are kept; meanwhile, a dynamic application range of a tracking loop is widened by adjusting an auxiliary coefficient of the auxiliary phase-locked loop of the frequency-locked loop, so that stability of the tracking loop in the high-dynamic environment is improved. The adaptive tracking method for the receiver in the high-dynamic environment has the advantages that the adaptive tracking method is capable of enabling the receiver to adjust own parameters timely in a dynamic change environment, errors of tracking satellite navigation signals are kept within a small range, and the shortcomings of large tracking errors and proneness to lock loss of the receiver in the prior art are overcome.

Description

technical field [0001] The invention relates to a satellite communication receiver, in particular to an adaptive tracking method in a high dynamic environment of the receiver. Background technique [0002] The Beidou satellite navigation system (hereinafter referred to as BD) is a global satellite navigation system independently constructed and operated by my country, and compatible with other satellite navigation systems in the world. It consists of 5 geostationary orbit (GEO) satellites, 27 medium earth orbit (MEO) satellites and 3 inclined geosynchronous orbit (IGSO) satellites. At present, the Beidou satellite navigation system has successfully launched 16 satellites, forming a regional service capability, providing passive positioning, navigation and timing services for most of my country and surrounding areas. [0003] BD satellite signals have three frequency points: B1, B2 and B3, among which B1 and B2 are two civilian signals. The B1 and B2 signals are formed on t...

AI Technical Summary

Problems solved by technology

[0007] 1) Although the phase-locked loop has a small carrier tracking error, its dynamic performance is poor, and it is difficult to track the carrier phase in a high dynamic environment, and it is easy to lose lock;

[0008] 2) Although the frequency-locked loop has a large tracking range for dynamic signals, the tracking error is relatively large;

[0009] 3) Although the frequency-locked loop auxiliary phase-locked loop can improve the dynamic performance of the tracking loop to a certain extent, its fixed initial loop bandwidth limits the dynamic range of the loop and the ability to resist noise interference

Moreover, although the tracking loop based on Kalman filter technology can track the signal well, it has high complexity and high cost of software implementation

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