In order to research on the design and implementation of a modernized GPS civil signals simulation system,a brief review of the modernized GPS signals is introduced,including the signal structure and characteristics o...In order to research on the design and implementation of a modernized GPS civil signals simulation system,a brief review of the modernized GPS signals is introduced,including the signal structure and characteristics of L2C,L5 and L1C signals.The design and implementation of the main modules of the simulation system is described in detail.The simulation system is mainly composed of parameter setting,system initialization,signal generator,noise generator,disturbance generator,signal synthesis,low-pass filter,A/D conversion and storage.The simulation results based on Matlab are then presented,and the power spectral density（PSD） of all navigation signals is analyzed.The simulation system completes the physical layer simulation of a modernized GPS new civil signal and can provide a controllable signal source for designing and testing of modernized GPS civil receivers,especially for the signal processing algorithm design of the GPS software receiver.展开更多
全球定位系统(GPS)现代化的一项重要内容是增加L5频点。目前天上只有五颗Block II F卫星可以发射L5信号,限制了新型接收机的研制与测试。卫星信号模拟器根据载体运动轨迹产生GPS信号,为GPS接收机提供逼真的仿真信号,因此,研制GPS L5信...全球定位系统(GPS)现代化的一项重要内容是增加L5频点。目前天上只有五颗Block II F卫星可以发射L5信号,限制了新型接收机的研制与测试。卫星信号模拟器根据载体运动轨迹产生GPS信号,为GPS接收机提供逼真的仿真信号,因此,研制GPS L5信号模拟器非常必要。在模拟器的研制中,上位机基带信号的产生是关键。本文在研究L5信号结构的基础上,利用软件编程产生L5基带信号,用软件接收机验证了产生信号的正确性。展开更多
基金The National Natural Science Foundation of China (No.41104015)Foundation of Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology of Ministry of Education (No.201011)
文摘In order to research on the design and implementation of a modernized GPS civil signals simulation system,a brief review of the modernized GPS signals is introduced,including the signal structure and characteristics of L2C,L5 and L1C signals.The design and implementation of the main modules of the simulation system is described in detail.The simulation system is mainly composed of parameter setting,system initialization,signal generator,noise generator,disturbance generator,signal synthesis,low-pass filter,A/D conversion and storage.The simulation results based on Matlab are then presented,and the power spectral density（PSD） of all navigation signals is analyzed.The simulation system completes the physical layer simulation of a modernized GPS new civil signal and can provide a controllable signal source for designing and testing of modernized GPS civil receivers,especially for the signal processing algorithm design of the GPS software receiver.
文摘全球定位系统(GPS)现代化的一项重要内容是增加L5频点。目前天上只有五颗Block II F卫星可以发射L5信号,限制了新型接收机的研制与测试。卫星信号模拟器根据载体运动轨迹产生GPS信号,为GPS接收机提供逼真的仿真信号,因此,研制GPS L5信号模拟器非常必要。在模拟器的研制中,上位机基带信号的产生是关键。本文在研究L5信号结构的基础上,利用软件编程产生L5基带信号,用软件接收机验证了产生信号的正确性。
