高动态GPS卫星信号模拟器导航电文生成

为了测试全球定位系统GPS(Global Positioning System)接收机的性能,应用GPS信号模拟器来模拟各种条件下真实的GPS信号.GPS卫星信号发生器由硬件、计算机和软件组成.软件主要由卫星导航参数计算模块、目标运动轨迹计算模块、误差计算模块等模块组成.导航电文产生功能模块是高动态GPS卫星信号模拟器要解决的一项关键技术.给出了3个卫星星钟改正参数的物理意义和星历产生模型,根据这些参数并结合相应的时间参数来形成卫星导航电文.通过程序仿真并与导航电文进行验证,证明推导出的星历产生模型基本符合GPS星的星座排列规律.

Research on the production of the navigation data of high dynamic GPS signal simulator

For the purpose of testing the performance of GPS(global positioning system) receivers, a GPS signal simulator is needed that can emulate the real GPS signals under all kinds of conditions. The high dynamic multi-channel GPS signal simulator device consists of hardware, computer and software. The software comprises the satellite navigation parameters calculation module, the target trajectory calculation module, the error calculation module and etc.Producing functional module of navigation data is a key technique that the high dynamic GPS signal simulator must solve. The physical meaning of the three parameters of satellite’s clock and the production model of the ephemeris were given. According to these parameters and their corresponding time parameters, Navigation data could be produced. By the procedure simulating and validating it with the navigation data, the results show that ephemeris and almanac correspond to the rules of the satellite’s arrangement.