基于FPGA扩频码捕获算法的研究和实现.pdf

哈尔滨工程大学硕士学位论文 ABSTRACT Wltllrapid development of chinese aerospace industry,global satellite navigation and positioning system ing increasingly an indispensable key part of Life and military and plays all important role of social cycle ofspreading codes using toglobal satellitenavigation and positioning system using parallel methods,which willgreatly consumption ofhardware aserialapproach,capture time is issignificance ofglobal satellitenavigation andpositioning system thathow tosolvetheconsumption ofresources and capture time. Thispaper studiesandanalyzes algorithms the basisofanalyzing algorithms capture,a novel GPS signalacquisition algorithm using differential C/Acodes andblockprocessing technique isproposed and realizedusing VHDL. Fist,thispaper introduces traditionalalgorithms example,serial correlation method inthe time domain,digital matched filtermethod and FFT. Performances which are capture time,probability ofdetection andresources of those ale simulatedand on thebasisofthetraditionalalgorithm,a codebased on thedifferentialtreatment ofcatch andblockalgorithm isproposed. On thebasisofthesame gainin‘dealing,notonly theacquisition timespeed up, butalsoresourcesusing capture ing ,tool QUARTUS and VHDL Language are applied tothisalgorithms capture inEP1S808956C6 chip of FPGA. Key words:spread spectrum;spread munication;differential code; FPGA;VHDL 哈尔滨工程大学学位论文原创性声明本人郑重声明:本论文的所有工作,是在导师的指导下,由作者本人独立完成的。有关观点、方法、数据和文献等的引用已在文中指出,并与参考文献相对应。除文中已经注明引用的内容外,本论文不包含任何其他个人或集体已经公开发表的作品成果。对本文的研究做出重要贡献的个人和集体,均已在文中以明确方式标明。本人完全意识到本声明的法律结果由本人承担。作者(签字): 些:垒曰期:嘲年弓月;7曰哈尔滨工程大学硕士学位论文第1章绪论 ,卫星导航定位正成为保障人类交通及军事活动的必要手段,并在现代社会发展中发挥着重要作用。卫星导航定位系统的基本功能和应用是向各类用户和运用平台实时提供准确、连续的位置、速度和时间信息。目前卫星导航定位技术己基本取代了无线电导航、天文测量和传统大地测量技术,成为人类活动中普遍采用的导航定位技术。拥有这种技术,就会在军事、外交和经济领域占据主动地位,获取巨大的利益。所以世界主要大国和商业集团不惜巨资发展卫星导航系统。目前,美国、俄罗斯已经拥有了覆盖全球的GPS和GLONASS卫星导航定位系统,日本及欧洲也正在加快其研制的步伐