Table of Contents
Advances in Aerospace Engineering
Volume 2014, Article ID 435891, 8 pages
http://dx.doi.org/10.1155/2014/435891
Research Article

Accurate Solution of Navigation Equations in GPS Receivers for Very High Velocities Using Pseudorange Measurements

Department of Electrical Engineering, Iran University of Science and Technology, Narmak, Tehran 16846-13114, Iran

Received 1 February 2014; Accepted 9 June 2014; Published 29 June 2014

Academic Editor: Davut Hanbay

Copyright © 2014 N. Rahemi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

GPS is a satellite-based navigation system that is able to determine the exact position of objects on the Earth, sky, or space. By increasing the velocity of a moving object, the accuracy of positioning decreases; meanwhile, the calculation of the exact position in the movement by high velocities like airplane movement or very high velocities like satellite movement is so important. In this paper, seven methods for solving navigation equations in very high velocities using least squares method and its combination with the variance estimation methods for weighting observations based on their qualities are studied. Simulations on different data with different velocities from 100 m/s to 7000 m/s show that proposed method can improve the accuracy of positioning more than 50%.