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Global Navigation Satellite System:Technology Innovation and Application (CPGPS 2009 PAPERBACK)

Beijing,China,8.8-8.9,2009

ISBN: 978-1-935068-03-7 Scientific Research Publishing, USA

Paperback 444pp Pub. Date: November 2009

Category: Engineering

Price: $60

Title: Research on WUL Algorithm of Galileo System
Source: Global Navigation Satellite System:Technology Innovation and Application (CPGPS 2009 PAPERBACK) (pp 55-59)
Author(s): Shouzhou Gu, Chinese Academic of Surveying and Mapping, Beijing, China
Jinzhong Bei, Chinese Academic of Surveying and Mapping, Beijing, China
Yamin Dang, Chinese Academic of Surveying and Mapping, Beijing, China
Abstract: According to the analysis on the computing process of Worst User Location(WUL)in Galileo system, the process of computing WUL should be divided into three steps: firstly, determining WUL on to a great circle of sphere; secondly calculating its coordinate on the sphere; lastly transforming the coordinate from sphere to ellipsoid. The results show that the distance errors based on different epochs and same orbit error are in centimeter level with 1.6cm as the greatest difference, and the distance errors based on the same epoch and different orbit errors are in centimeter level, indeed in millimeter level with 0.36cm as the difference between maximum and minimum. They all prove that this method can meet the demanding precision of WUL and the distance errors calculated are stable and high precision. This method has a certain reference value and the guide meaning for the development of GNSS integrity theory
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