GPS软件接收机捕获算法  

Acquisition algorithm of GPS software receiver

作　　者：徐晓苏[1] 范金洋[1] 

机构地区：[1]东南大学仪器科学与工程学院,南京210096

出　　处：《中国惯性技术学报》2009年第2期165-169,共5页Journal of Chinese Inertial Technology

基　　金：国防973项目(973-61334);总装备部预研项目(51309060402);总装备部预研项目(513090);自然科学基金项目(60874092);教育部博士点专项科研基金项目(20050286026);原国防科工委基础科研项目(C1420080224)

摘　　要：研究了GPS软件接收机捕获算法;针对常规时域串行搜索算法速度慢和并行码相位频域搜索算法FFT计算量大等缺点,采用常规串行捕获算法和频域并行码空间捕获算法相结合的混合搜捕算法来实现对空中可见卫星的捕获;针对信号较弱情况下的卫星捕获,采用了非相关积分捕获算法;设计了中频信号仿真器,并使用其产生的仿真信号对捕获算法进行了验证。测试结果表明,混合搜捕算法能够为软件接收机提供较快的捕获能力,非相关积分捕获算法能够有效地实现微弱信号的捕获。An acquisition algorithm based on GPS software receiver was studied. Since the conventional serial search algorithm in time domain was slow and the parallel search algorithm in frequency domain needed heavy computation, a mixed acquisition algorithm, utilizing conventional serial acquisition algorithm in time domain and parallel search algorithm of code in frequency domain was presented. To solve the acquisition of weak signal, a non-correlation acquisition algorithm was introduced. To validate the acquisition algorithm, an IF signal simulator was designed. The test results show that the mixed acquisition algorithm can provide the software GPS receiver with fast signal acquisition, and the non-correlation acquisition algorithm can effectively acquire the weak signal.

关 键 词：GPS软件接收机 捕获 微弱信号 信号仿真器 

分 类 号：U666.1[交通运输工程—船舶及航道工程]