基于ESPRIT谱估计的GPS多普勒快速捕获

Rapid Acquisition of GPS Doppler Based on ESPRIT Power Spectral Estimation

本文针对解扩后GPS信号的特点,提出利用ESPRIT谱估计方法估计多普勒频偏,从而实现GPS多普勒频偏的快速捕获的方法,论文首先分析了频域相关快捕方式下多普勒的快速捕获原理给出了平均捕获时间,对利用ESPRIT算法估计GPS多普勒进行了仿真研究,并和ARMA参数模型法、FFT法进行了对比,仿真结果证明ESPRIT谱估计方法在一般GPS信号信噪比下可以获得高精度,高稳定度的多普勒估计,并且计算量比FLL小.该方法能有效地减少GPS多普勒的捕获时间.

Based on studying the characteristic of GPS dispread signal, this paper put forward estimating GPS Doppler shift by using ESPRIT spectral estimation to reduce AFC loop convergences time , then we can reduce the average acquisition time of GPS Doppler, this paper analysis the principle of Doppler rapid acquisition using FFT_based approach and the expression of convergence time of acquisition is derived, GPS Doppler estimation using ESPRIT algorithm have been simulated , and compared to ARMA parametric Spectral Estimation and FFT, the simulation results have shown that we can get high accurate and high steady GPS Doppler estima- tion and need less computation by using themethod, and this method can reduce the time of GPS Doppler acquisition effectively.