一种提高GPS定位精度的组合定位方法  

Combined positioning method for improving the GPS positioning accu racy

作　　者：李康吉[1] 刘国海[1] 

机构地区：[1]江苏大学电气信息工程学院,镇江212013

出　　处：《东南大学学报（自然科学版）》2004年第B11期88-91,共4页Journal of Southeast University：Natural Science Edition

摘　　要：验证了DGPS和卡尔曼滤波器在提高GPS接收机定位精度方面的有效性 .针对静态定位的特点 ,对传统卡尔曼滤波方程做出改进 ,消除由速度误差引起的定位偏离 ,并进一步采用组合滤波结构以完善动态滤波器的静态定位性能 .利用DGPS和卡尔曼滤波器在减少误差类型上的互补性 ,本文采用一种组合定位的方法 ,以起到同时减少常值误差和随机误差的作用 .实验证明 ,如果融合DGPS和卡尔曼滤波技术采用组合定位的方法 ,可以将定位精度从 2 .4m( 2σ)提高到 0 .9m( 2σ) .The efficiency of differential global position system (DGPS) a nd Kalman filter on improv ing GPS receiver’s positioning accuracy are verified. Conventional Kalman filte ring equations are improved to eliminate positioning error caused by velocity er ror for station ary positioning. Furthermore, a combined filtering structure is proposed to impr ove static positioning performance of dynamic filter. Taking advantage of the co mplementary effect of DGPS and Kalman filter on decreasing positioning errors, a combined filtering approach is adopted. Test results show that, by means of com bined positioning which combines DGPS with Kalman filter technology, the positio ning accuracy is drastically improved from 2.4?m(2σ) to 0.9?m(2σ).

关 键 词：DGPS 卡尔曼滤波 组合定位 

分 类 号：P228[天文地球—大地测量学与测量工程]