GPS信号P码直接捕获方法  

Research on GPS P-Code Acquisition Method

作　　者：王嘉宁[1] 宋真东 廉保旺[1] 

机构地区：[1]西北工业大学电子信息学院,西安710129 [2]陕西烽火通信集团有限公司,陕西宝鸡721000

出　　处：《火力与指挥控制》2011年第6期74-76,92,共4页Fire Control & Command Control

基　　金：西北工业大学科技创新基金(2007KJ01028);航空电子系统综合技术国防科技重点实验室和航空科学基金资助项目(20085553016)

摘　　要：GPS系统中P码主要用于提供精密定位服务。为保证扩频信号具有更高的扩频增益、更强的抗模仿和抗欺骗能力,必须实现P码的直接捕获。同时,对P码这种超长伪码捕获技术研究对于扩频系统信息安全保密传输具有重要的意义。针对传统的P码直捕方法消耗资源大捕获时间长的问题,采用了一种基于XFA ST短相关并行捕获的方法,并在M atlab平台上对该算法进行了仿真。分析表明该算法在减少资源消耗、实现快速捕获以及抗干扰方面具有较大的优越性。P-code in GPS is applied to precise positioning service,and P-code direct acquisition should be implemented in GPS receiver in order to achieve higher spread spectrum gain, better anti-deception and anti-spoofing, and it is meaningful for the development of our own satellite positioning system in the future. A new P-code direct acquisition method by parallel short correlation base on XFAST is present to slove the problem of large resource consume and long acquisition time of P code acquisition, and the simulation of the P-code acquisition and the analysis of the algorithm＇s performance are implemented in the Matlab platform. The analysis result indicates that the acquisition method could reduce resource consume, implement the fast acquisition and strengthen the anti-iamming cpabilitv.

关 键 词：P码直捕 XFAST 短相关 并行捕获 

分 类 号：TN911[电子电信—通信与信息系统]