GPS信号发生器射频模块的一种实现方案

为了测试GPS（Global Positioning System）接收机的性能，需要用GPS信号发生器来模拟各种条件下的真实GPS信号。国外高性能GPS信号发生器的功能已经相当完善，但其核心技术对我国高度保密，而且市场上的GPS信号模拟器售价比较高。因此，自主研制GPS信号模拟器对我国的国防建设具有重大意义。本文介绍了GPS信号发生器射频模块的一种较优的实现方案，该方案采用移相法实现频率调制，具有电路实现简单、灵活性较大、性能指标较高等特点。

Implement Method of GPS Signal Simulator''''s Radio Module

For the purpose of testing the performance of GPS （Global Positioning System） receivers,a GPS signal simulator is needed which can simulate real GPS signals under all kinds of conditions. Functions of high performance GPS signal simulators in foreign countries are excellent but the key techniques are kept secret to our country and GPS signal simulators are expensive in the market. Thus, it＇s very important for the construction of national defense to develop a GPS signal simulator by ourselves. This paper introduces a better implement method of a GPS signal simulator＇s radio module. This method realizes frequency modulation through the method of phase shift and it has the features of easy to implement,high flexibility and high performance.