摘要
传统GPS导航定位解算方法需要事先成功捕获、跟踪并实时获取多颗卫星的伪距测量,不适用于弱信号环境下卫星信号无法捕获的场景。集体检测是一种将各卫星信号的相关能量非相干累加后依据极大似然准则进行直接位置估计的理论。本文基于A-GPS提供的先验信息,提出了一种实现集体检测的具体参数估计方法和搜索策略,并基于真实GPS弱信号验证了算法的实际性能。实际试验表明,本方法与信号是否成功捕获和跟踪无关,适用于弱信号等环境下的定位解算。
The pseudorange measurements of multiple satellites are needed to be successfully acquired,tracked and obtained in advance for applying traditional GPS navigation and positioning methods which are not suitable for scenarios of none satellite signals acquired in weak signal environment.Collective detection is a theory of direct position estimation based on maximum likelihood criterion in which the correlation energy of each satellite signal is noncoherently accumulated.Based on the prior information provided by AsistedGPS,a specific parameter estimation method and a search strategy are presented for collective detection,and the actual performance of the algorithm is verified in weak signal processing based on real GPS signals.Practical experiments show that this method has nothing to do with the success of signal acquisition and tracking and it is suitable for position estimation in weak signal environment.
作者
陈万通
汪竹青
刘庆
Chen Wantong;Wang Zhuqing;Liu Qing(Tianjin Key Lab for Advanced Signal Processing,Civil Aviation University of China,Tianjin 300300,China;Shanghai Aerospace Electronic Technology Institute,Shanghai 201109,China)
出处
《航天控制》
CSCD
北大核心
2019年第3期8-12,30,共6页
Aerospace Control
基金
中央高校基本科研业务费项目(3122018D012)
国家自然科学基金(61401468)
