基于UKF的高动态GPS载波跟踪  

High Dynamic Carrier Tracking Method Based on UKF

作　　者：张光龙[1] 张会生[1] 李立欣[1] 

机构地区：[1]西北工业大学电子信息学院,西安710129

出　　处：《计算机系统应用》2014年第3期181-185,87,共6页Computer Systems & Applications

基　　金：陕西省自然基金(2012JQ8025);西北工业大学基础研究基金(FFR-NPU-JC201118);西北工业大学电子信息学院"E之星"项目(E20110003)

摘　　要：在高动态环境下,传统的GPS载波跟踪环无法保证可靠的跟踪.本文提出一种改进的基于无迹卡尔曼滤波的高动态载波跟踪方法,采用频率快速牵引方法来保证滤波快速收敛,并加入了一种载波幅度的估计方法.利用美国喷气推进实验室高动态载体模型对环路的跟踪性能进行了测试.测试结果表明,该方法在高动态环境下不仅能快速牵入和锁定载波信号,而且在高达100g/s的加加速度作用过程中也能持续精确的跟踪.Under high dynamic situation, the typical GPS carrier tracking loop can not guarantee a reliable tracking. In this paper an improved high dynamic carrier tracking method based on unscented Kalman filter is presented, a rapid frequency traction method is adopted to ensure that the filter can convergence quickly, and joining a carrier amplitude estimation method. The U.S Jet Propulsion Laboratory high dynamic carrier model is used to test the loop tracking performance, the test results show that the method can not only pull-in and lock the carrier signal quickly in a high dynamic environment, but under the the jerk of up to lOOg/s which also have a continous and precise tracking performance.

关 键 词：高动态 GPS 无迹卡尔曼滤波 载波跟踪 

分 类 号：P228.4[天文地球—大地测量学与测量工程]