High dynamic satellite navigation signal rapid capture and tracking system and method

Abstract

The invention relates to a high dynamic satellite navigation signal rapid capture and tracking system and method. The method comprises the following implementation steps that S1, related parameters are set according to the capture requirements, and intermediate frequency signals are read to be mixed with local carrier; S2, windowing is performed on PMF and FFT modules based on the conventional PMF+FFT to implement capturing; S3, an adaptive threshold adjustment method is adopted on signal peak judgment after FFT operation so as to obtain the capture result; S4, the process enters the tracking stage, frequency mixing and pseudo code correlation are performed on the intermediate frequency data and the result after correlation is integrally cleared so as to obtain a coherent integral value; S5, dimension enlarged unscented Kalman filter is adopted for carrier tracking, and the state vector optimal estimation value is obtained according to the dynamic model and the measurement model of the system; and S6, the conventional code ring under carrier aiding is adopted in code tracking. According to the method, the problems of rapid capture and tracking of the high dynamic satellite navigation signals can be solved, and the dynamic performance can be 100g.

Description

technical field [0001] The invention relates to a system and method for quickly capturing and tracking high-dynamic satellite navigation signals, belonging to the field of satellite signal processing. Background technique [0002] At present, with the continuous development of my country's military and aerospace industries, traditional receivers have been unable to meet the needs of navigation and positioning during high-speed operation. For this reason, China has begun to develop receivers under high dynamic conditions. Because the receiver has a very large speed, acceleration, and jerk in a harsh environment with high dynamics, the Doppler change of the signal increases sharply, causing the receiver to be very slow. It is difficult to capture and track GPS signals. Traditional acquisition algorithms such as sliding correlation are two-dimensional serial searches of Doppler frequency and code phase. If it is captured, it is easy to lose it. The traditional tracking loop ca...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method suitable for fast acquisition and stable tracking in navigation receivers in high dynamic environments, which overcomes the large number of FFT points in the prior art, only using PMF and introducing delay accumulators , resulting in long capture time, small capture Doppler frequency shift range, easy missed detection, high hardware resource consumption and low capture accuracy, as well as poor dynamics of traditional tracking loops, low tracking accuracy, and volatile Lock and other issues

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