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《Journal of Northwestern Polytechnical University》 2007-01
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A Positioning Algorithm for the "Beidou" Navigation System

Lian Baowang,Zhao Nan,Wang Yongsheng(Department of Electronic Engineering,Northwestern Polytechnical University,Xi′an 710072,China)  
The PRC "Beidou" navigation system actually consists of three satellites,but its positioning algorithm only utilizes the signals of two of them.We now present an improved algorithm that utilizes the signals of all three satellites.In the full paper,we explain in detail our improved algorithm and simulation results using this improved algorithm;in this abstract,we just add some pertinent remarks to listing the two topics of explanation:(1) the improved positioning algorithm for "Beidou" navigation system and(2) the measurement of the velocity of the user of "Beidou" navigation system using the improved navigation system;the three subtopics of topic 1 are the positioning principles of the "Beidou" navigation system(subtopic 1.1),our improved positioning algorithm(subtopic 1.2) and position simulations using our improved positioning algorithm(subtopic 1.3);in subtopic 1.2,we derive eqs.(1),(2),(3) and(4) in the full paper;in subtopic 1.3,we give the simulation results of user's position in Figs.1 through 7 in the full paper;the three subtopics of topic 2 are the GPS user′s velocity measurement equations(subtopic 2.1),the "Beidou" navigation system′s velocity measurement algorithm(subtopic 2.2) and velocity simulations using our improved algorithm(subtopic 2.3);in subtopic 2.2,we derive eq.(11) in the full paper giving the velocity of user.The above-mentioned position and velocity simulation results show preliminarily that our improved algorithm can reduce user′s time error and frequency error.
【CateGory Index】: V249.32
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