一种GPS软件接收机的设计  

Design of a software GPS receiver

作　　者：罗大成[1] 王仕成[1] 曾洪贵[2] 胡永霞 杨东方[1] 

机构地区：[1]第二炮兵工程学院,西安710025 [2]96325部队通信网络技术管理中心,怀化418008 [3]三江集团红阳机械厂,孝感432100

出　　处：《仪器仪表学报》2008年第9期1856-1861,共6页Chinese Journal of Scientific Instrument

基　　金：国家863课题(2006AA705320)资助项目

摘　　要：随着软件无线电技术的发展,基于软件无线电思想的GPS软件接收机技术取得了长足进展,并成为新一代GPS接收机研制的热点.基于GPS卫星C/A码信号模型,完成了一种基于FFF算法的卫星信号的捕获仿真;设计了一种基于四相鉴频器,锁频环和锁相环的混合载波跟踪算法;设计了一种导航数据的解调算法,完成了卫星信号的导航解算:仿真结果表明,所设计的软件接收机能较好地对卫星信号进行捕获,能准确跟踪含有不同变化规律多普勒频率的载波,并能正确的解调出导航数据。With the development of the software-radio technology, the software GPS receiver technology based on the concept of software radios developed rapidly and has become the research focus on GPS receiver. Based on the C/A code signal model on L1 carrier wave of the GPS satellites, the acquiring process of the satellite signal was simulated by using a FFT acquiring algorithm. A mixed carrier tracking method based on four quadrant frequency discriminator （ FQFD）, frequency lock loop（FLL） and phase lock loop（PLL） was devised. A method of demodulating navigation data was designed to implement the navigating calculation for satellite signals. The simulation results verified that the designed software receiver can be used to acquire the satellite signal appropriately; the software GPS receiver is capable of accurately tracking satellite signal which contains the multi-Doppler frequency, and the navigation data can be demodulated correctly.

关 键 词：GPS软件接收机 捕获 跟踪 导航解算 

分 类 号：P228.4[天文地球—大地测量学与测量工程]