一种含模型偏差的GPS伪码跟踪误差估计器  

GPS PN Code Tracking Error Estimator with Model Bias

作　　者：李建文[1] 郝顺义[1] 

机构地区：[1]空军工程大学工程学院,西安710038

出　　处：《数据采集与处理》2009年第B10期20-24,共5页Journal of Data Acquisition and Processing

摘　　要：在自适应卡尔曼滤波算法的基础上提出了一种带模型偏差的GPS伪码跟踪误差估计器。分析了偏差产生时信息均值的变化规律,以此构造统计量来检验模型偏差,并根据检验结果以最小二乘法估计其量值。同时,为增强伪码跟踪误差估计量的数值稳定性,将平方根算法与自适应卡尔曼滤波算法相结合,给出了偏差模式下的伪码跟踪误差估计算法。仿真结果表明该算法有效。Based on the adaptive Kalman filtering algorithm, an estimator for the GPS PN code tracking error with model bias is proposed. The mean value change law of the innovation is analyzed when the bias is generated. According to the law, a statistic is constructed to test the model bias, and the least square method is used to estimate the bias according to the testing result. Meanwhile, in order to intensify the numeric stability of the PN code tracking error estimation, the square root algorithm is combined with the adaptive Kalman filtering algorithm, and an algorithm for the PN code tracking error estimation is presented. Simulation result shows the effectiveness of the algorithm.

关 键 词：组合导航 伪码跟踪误差 模型偏差 平方根算法 

分 类 号：V249.32[航空宇航科学与技术—飞行器设计]