中频GPS信号模拟器方案设计  

Schematic Design and Verification for IF GPS Signal Generator

作　　者：丁继成[1] 赵琳[1] 黄卫权[1] 刘付强[1] 

机构地区：[1]哈尔滨工程大学自动化学院,哈尔滨150001

出　　处：《数据采集与处理》2008年第4期497-501,共5页Journal of Data Acquisition and Processing

基　　金：国家自然科学基金(60474046)资助项目

摘　　要：为检验软件接收机对信号的同步性能,以中频GPS信号模型为基础构建了一种数字中频GPS信号软件模拟器,设计了模拟器的总体方案。通过分析卫星运动状态和接收机的位置关系提出了信号传播时间的迭代计算方法,针对实际信号中多路径效应复杂的情况,由散射多径和镜面多径对有用信号的影响导出了一种简单的镜面多路径误差模型。实验结果表明模拟器输出的信号符合真实中频GPS信号的特点,对仿真信号的捕获进一步验证了方案模型的正确性与实用性。To test the synchronization performance of the software receiver, a digital IF （intermediate frequency） GPS signal generator is built based on the IF GPS signal theoretical model, and an overall scheme is designed for the generator. An iterative method is presented to calculate the signal propagation time according to the position relation between the satellite and the receiver. To simulate the complex multipath on the actual signal, the text analyzes the impact of the scattered multipath and mirror multipath to useful signal, then implements a simulation and obtains a modeling method for the mirror multipath error. Results indicate that the signal from the generator can match with the actual IF GPS signal. The signal acquisition verifies the accuracy and the practicability of the scheme.

关 键 词：GPS 信号模拟 传播时间 多路径 循环相关 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]