GPS中新的长码直捕算法的提出与分析.pdfVIP

Vol. 34, No. 6 346 Jun, 2009 Fire Control Command Control 2009 6 : 1002-0640(2009) 06-0035-04 GPS * 1, 2 2 1, 2 刘　芳 , 冯永新 , 潘成胜 ( 1. , 210094, 2. , 110168) : GPS , , P , , ,,:, :GPS,, ,P : TN96:A The Propose and Analyze of the New Direct Acquisition Methods based on Long Code in GPS 1, 2 2 1, 2 LIU Fang ,FENG ong-xin , PAN Cheng-sheng ( 1. Nanj ing University of Science and Technology N anj ing, 210094,China, 2.Communication and N etwork Institute of Shen Yang L i Gong University, Shenyang 110168,China) Abstract Long code is usually acquired depending on short code But direct P code acquisition should: . , , - be implemented in GPS in order to achieve the higher spread spectrum gain the better anti deception and anti-spoofing. Basing on researching the structure and the characteristics of P code, the more effective acquisition algorithms were analysed, and a new fast direct acquisition algorithm has been proposed. T he new algorithm was designed in simulative environment, which proved such new algorithm is effective algorithm In the same time the base of carrying on project is founded. , . ey words GPS direct acquisition circle correlation P code: , , , , XFAST 引　言 GPS P , P , [ 1] , GPS ,, Doppler , , , , , , ,