摘要
为了给全球定位系统(GPS)软、硬件接收机提供高保真的测试环境,在分析GPS信号传输路径各种影响的基础上,推导了GPS中频信号模拟器的数学模型,提出利用已有星历计算卫星传输时间和仿真误差源的方法,并给出了软件的实现方案。利用软件GPS接收机测试仿真信号结果表明:利用该方法能够正确地模拟中频GPS C/A(粗码)和P(精确码)卫星信号。该方法实现简单,通过增加相应的算法能够模拟各种类型的GPS信号,可以对软、硬件接收机的捕获、跟踪以及测量精度进行测量鉴定,为新技术的应用提供开发环境。
Global positioning system （GPS） IF signal simulators provide hlgh-fidelity measurement environments for GPS software or hardware receivers. Based on analyzing the effects of error sources on GPS signals, the mathematical models of IF simulator and algorithems of computing transmission time by using existing ephemeris are present. A software realization of a GPS IF signal simulator is presented where the simulated signal is processed by a software GPS receiver. Measurement results show that this method accurately simulates GPS IF C/A and P codes. This scheme can he easily realized and expanded to simulate other GPS signals by adding other algorithms for evaluating acquisition, tracking, and precision of GPS software or hardware receivers. This method also supports new GPS technology development.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第10期1582-1585,共4页
Journal of Tsinghua University(Science and Technology)
