Study On The Positioning Performance Of GPS/BDS Integrated Navigation Simulation Analysis

With the continuous development of science and technology,there are four satellite navigation systems in the world: the United States GPS system,China's beidou satellite navigation system,Russia's glonass of satellite navigation system and the European Union Galileo satellite navigation system.In order to meet the requirements of navigation positioning performance and higher accuracy requirement,use a combination of two or more satellite navigation system has become a new research direction.Integrated navigation system can increase the navigation and positioning observation capacity,improve the positioning performance extend more application fields.In this paper,based on the satellite tool kit(STK)simulated analysis of beidou system and GPS systems for individual system and combined system,about satellite link analysis,coverage analysis,mainly includes the following aspects:Firstly,This paper discusses the GPS and beidou system research present situation and aiming at the existing differences of the two systems of GPS and beidou system analysis,the compatibility and interoperability between the necessity and feasibility analysis for the combination of the two system;Secondly,studied the mathematical model and algorithm of the GPS,the Beidou system and GPS and the two generation combination positioning.Thirdly,through the STK software on the GPS and Beidou system for a separate system and combined system analysis and accuracy assessment.Finally,the following conclusions are obtained by analyzing the satellite visibility and DOP values of GPS,beidou and combined system :Beidou system under the same condition,ganzhou area was 20.83% less than the number of visible satellites GPS system,GPS positioning precision in the range of 6 to 17 meters,beidou positioning accuracy range between 8 to 20 meters,GPS positioning accuracy is 17.64% higher than the beidou system;Simulation results show that the future beidou system with five full GEO satellite and 3 IGSO enhancement effect,its localization accuracy in ganzhou district six meters or more,positioning accuracy is35.29% higher than that of GPS system,the positioning performance is superior to the GPS system;According to different height Angle affect the experimental analysis of a single system with the increase of satellite altitude Angle,DOP value increases,its positioning precision,satellite altitude Angle in ganzhou region about 200,can getthe best navigation performance;Combination of GPS and beidou navigation system by increasing the number of visible satellites,positioning accuracy is 47.05% higher than single GPS system,55% higher than that of beidou system,The integrated navigation system can be improved by increasing the number of visible satellites.