ISSN: 1673-825X    Imprint: Chongqing University of Posts and Telecommunications Journal
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一种改进的GPS测码伪距单点定位算法
An improved algorithm for single point position of GPS with code pseudo-range
DOI:10.3979/j.issn.1673-825X.2009.06.008
Received:December 02, 2008  
中文关键词:单点定位  最小二乘  求差法  几何精度因子(GDOP)
英文关键词:single point position  least square  differential position  value of geometric dilution of precision(GDOP)
基金项目:
Author NameAffiliation
TIAN An-hong, FU Cheng-biao, ZHAO Shan Key Lab of Mobile Communication Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, P. R. China 
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中文摘要:
      GPS是通过在同一时刻观测4颗以上的卫星,利用伪距观测量来解算出接收机的位置和钟差。针对传统的迭代最小二乘算法精度依赖于初始值的估计,且迭代计算量大,给出了一种改进的求差算法,即将GPS单点定位的非线性观测方程转化成线性方程直接求解测站坐标。利用VC编程提取出GPS接收机纪录的数据,通过仿真表明该算法计算简单,不需要观测站的初始值,不需要求导计算和迭代计算,从而验证了这种改进算法的优越性。
英文摘要:
      GPS uses pseudo-range measurements to calculate the receiver's location and clock by observing more than 4 satellites. The traditional iterative least-squares algorithm accuracy depends on the value of the initial estimates, and the iterative calculation is large. Hence, an improved algorithm is given, and it can be used to transform nonlinear equations to linear equations by differentiating to solve station coordinates. VC program extracted GPS receivers' record data, the simulation results showed that the improved algorithm is simple and does not require the initial value, derivative calculation and iteration calculation, which verifies the superiority of the algorithm.
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