基于Matlab的数字中频GPS信号生成模型

精确的GPS信号生成器是测试与评价先进GPS接收机设计的重要分析工具。本文在中频GPS信号理论模型分析的基础上,用Matlab实现了一种数字GPS信号生成模型,它能够在数字中频上产生GPS接收信号,其中包含仿真的噪声和接收机时钟误差。与常规的GPS信号生成器(或模拟器)相比,这种模型设计灵活、易于使用,此外,模型构建涉及对GPS信号在接收机射频前端处理过程的仿真,从而为GPS接收机射频前端的设计提供了支持。

A Matlab Based Digitized IF GPS Signal Generator Model

Accurate GPS signal generators can be used as the analysis aid in test and evaluation of advanced GPS receivers designs. In this paper, based on the analysis of the IF GPS signal theoretic model, a digitized GPS signal generator is implemented in Matlab, which can generate the received GPS signal at the digitized IF frequencies, and the noise and receiver clock error are also simulated. Compared to conventional GPS signal generators (or simulators), this model is flexibly designed and easy-to-use, in addition it provides support to the design of the GPS receiver RF front end, for the signal processing in the RF front end is simulated during the modeling.