关键词: 伪距, 相对伪距, Hermit插值

Abstract:

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 tightly-coupled 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.

Key words: pseudo-range;relative pseudo-range;Hermit polynomial interpolation