Design of a TwelveChannel Digtal GPS Simulation System
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摘要: 为了测试GPS(全球定位系统)接收机的性能,需要应用GPS信号模拟器来模拟各种条件下真实的GPS信号.分析了单通道与多通道GPS信号的时域及频域特性,建立了十二通道GPS信号模拟器的数学模型.该模型应用了软件无线电的设计思想和内插理论,可以直接产生35.42MHz的中频信号,以降低硬件设计的复杂度.文中用SystemView软件的仿真结果验证了系统设计的可行性,并提出了该系统的硬件实现.Abstract: For the purpose of testing the performance of GPS receivers, a GPS signal simulator is needed that can emulate the real GPS signals under all kinds of conditions. Single channel and multi-channel GPS signals' characters in time domain and frequency domain are analyed. A mathematic model of the twelve-channel GPS simulator is proposed. In order to reduce the difficulties of the hardware design, this model is designed to provide a 35.42MHz IF signal directly by applying the idea of "software radio" and the theory of interpolation. Simulation results with SystemView software have demonstrated the feasibility of the system scheme. In addition, a practical hardware design of this system is described.
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Key words:
- signal generators /
- interpolation /
- digital modulation /
- global position system /
- software radio
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