摘要
INS/GPS紧耦合导航中将卫星伪距、伪距率作为观测量,而伪距、伪距率中的误差影响了组合导航系统的输出精度,其运算量大,制约了紧耦合导航系统数据率的提高。文中通过实测数据探讨了紧耦合导航中伪距、伪距率的误差来源,并使用相对伪距、伪距率消除其中的接收机误差项。在此基础上提出利用Hermit分段3次插值法实现对卫星位置的快速解算,得到一种面向紧耦合导航的伪距、伪距率高精度快速估计算法。实验结果表明,该算法有效提高了伪距、伪距率的计算精度与速度。
A tightly-coupled INS/GPS integrated navigation system is put forward which takes the pseudo-range and pseudo-range rate of GPS as the observations. Errors of pseudo-range affect the integrated navigation system output accuracy, and the large computation of computing pseudo-range and pseudo-range rate restrict the tightly coupled navigation system data rate. The sources of pseudo-range error and pseudo-range rate error are discussed. The error of receiver is eliminated by using relative pseudo-range and relative pseudo-range rate. On this basis, a fast and accurate algorithm by using Hermit piecewise cubic interpolation to solve pseudo-range and pseudo-range rate in tightlycoupled INS/GPS integrated navigation is studied. The experimental results indicate that the algorithm can improve the accuracy as well as the speed of solving pseudo-range and pseudo-range rate.
出处
《电子科技》
2014年第1期22-24,29,共4页
Electronic Science and Technology
关键词
伪距
相对伪距
Hermit插值
pseudo-range
relative pseudo-range
Hermit polynomial interpolation
