gps信号捕获的抗干扰和多普勒预估方法-电路与系统专业毕业论文.docx

ABSTR ACT
ABSTRACT
Two methods iIl ensure and enla撇GPS acquisition performance have been
stlldied iIl tllis meSis.
The acquisition pr0Cess needs long sequence of啷elating accum帆ion for weak
GPS sign, order to limit me hardware sere and power Consumption of signal
process unit,me b硒e band signal h弱to be qu觚tized、)l,im low Ⅱle same tiInc, GPS sign,s ale vuln劬le t0 interf-er翎c髓,eimer unimentional or
mese iIlterf柏lces,me narrow band contjnuolls wave(CW)iS tlle moSt colnlTlOn type. Signal to noise ratio(SNR)in traditional quanfizer、析m丘Xed quanfizing levds
de伊ades rapidly ill the pres饥tS of CW a regult subsequent process馏
lose t11e three of getting proper渊elation peak.
B弱cd on me tlle0叫and experiment reSults of nolllinear adaptive A/rert%a method of re-quanfizing h雒been anal)rzed aIld h勰been proved也e method is able to suppress CW mterference significantly.
The Doppler of GPS signal is dommated by smdlite’S position and velour,嬲well
as me receiver’s position and velod够The receiver’s position Gall be铭timated while receiver’s velocity Can be pensated by external method
of deriving satellite’S position锄d velo嘶from cphemeris has been proposed;witll
which Doppler of tlle signal from certain satellite caIl be the acquisition
proems shrinks its range of Doppler searcll,hence me acquisition time Call be reduced,
espeCially for c01d—start receive.
Key words:GPS,qumtizafion,acquisitio玛Doppler,印hemeris
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签名: 丝垫 日期:砌扩年6月卫日
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签名:笊屯
第一章绪论
第一章 绪论
GPS卫星发送的导航定位信号,是一种可以供无限用户使用的信息资源。对于地面,海面和空中的广大用户,只要拥有能够接收、捕获、跟踪和解算GPS信号的设备,就可以用GPS信号进行导航定位。由于使用目的不同,GPS接收机的具体设计也各有差异,但是其射频和基带信号处理部