A high dynamics algorithm based on steepest ascent method for GNSS receiver  

作　　者：Qinghua ZENG Wenqi QIU Jianye LIU Rui XU Jinheng SHI Yongrong SUN 

机构地区：[1]Navigation Research Center,Nanjing University of Aeronautics&Astronautics,Nanjing 211106,China [2]Key Laboratory of the MI IT Advanced Aircraft Navigation,Control ami Health Management,Nanjing 211106,China [3]Jiangsu University Collaborative Innovation Center for Satellite Communication and Navigation,Nanjing 211106,China

出　　处：《Chinese Journal of Aeronautics》2021年第12期177-186,共10页中国航空学报（英文版）

基　　金：funded by National Natural Science Foundation of China(Nos.61533008,61603181,61673208,61873125)。

摘　　要：High dynamic conditions impose critical challenges on Global Navigation Satellite System(GNSS)receivers,leading to large tracking errors or even loss of tracking.Current methods that intend to improve receivers’adaptability for high dynamics require either complicated structures or prior statistical information of noises.This paper proposes a high dynamics algorithm based on steepest ascent method that can circumvent the deficiencies of existing methods.First,the relationship between the error of carrier tracking and the maximum of Fast Fourier Transform(FFT)outputs is established,and a performance function based on the steepest ascent method is designed.It can keep stable in high dynamics.Second,a new carrier-tracking loop is constructed by deploying the performance function.When the variation of GPS receiver acceleration ranges from 10 g to 100 g,compared with the PLL that either loses lock or keeps tracking accuracy less than 33.89 Hz,the experimental results show that the proposed method can not only keep tracking,but also achieve tracking accuracy more than 2.77 Hz.

关 键 词：Carrier tracking loops Fast Fourier Transform(FFT) Global Navigation Satellite System(GNSS) High dynamics Steepest ascent 

分 类 号：TN967.1[电子电信—信号与信息处理]