GPS中频信号快速捕获技术分析  

Technique analysis of GPS IF signal rapid acquisition

作　　者：徐卫明[1] 刘雁春[1] 朱穆华[1] 

机构地区：[1]海军大连舰艇学院海测工程系

出　　处：《测绘科学》2007年第5期98-100,共3页Science of Surveying and Mapping

摘　　要：为解决GPS中频信号快速捕获问题,在介绍GPS码相位和载频信号捕获原理的基础上,重点阐述了基于FFT的并行GPS中频信号快速捕获方法,同时在非相干累加、接收信噪比、先验信息等方面分析了提高中频信号快速捕获的可能性,最后利用一组GPS实测数据对上述分析进行了的仿真计算。仿真结果表明基于FFT技术的中频信号快速捕获方法具有抗干扰、捕获速度快和检测低信噪比信号的能力,可以满足GPS软件接收机定位的要求。To solve the problem of GPS IF signal rapid acquisition, the basic methods of GPS code phase and carrier frequency signal acquisition were introduced.Based on fast Fourier transform(FFT),the acquisition algorithm of parallel GPS IF signal was discussed.Meanwhile,the possibility to improve the performance of IF signal rapid acquisition were analyzed from the non-coherent accumulation,signal-to-noise ratio(SNR) received to priori information.Finally,the simulation were carried out by a group of GPS data measured,and the simulation results showed that the rapid algorithm of IF signal acquisition based on FFT had the capabilities of anti-jamming,rapid acquisition speed and detecting low SRN signal,which could meet the requirements of the current GPS software receiver.

关 键 词：GPS 中频信号 捕获 FFT 

分 类 号：P228[天文地球—大地测量学与测量工程]