电离层多普勒接收机的设计与实验

利用软件无线电技术设计了一种电离层多普勒接收机. 该接收机采用DSP, FPGA等数字芯片与PXI总线进行架构, 使用GPS作为接收机的时间和频率同 步模块, 能够灵活设置系统参数. 实验接收来自中国蒲城陕西天文台的高 频时间信号, 实时获取由于电离层扰动所产生的多普勒频率偏移信息. 使用通过MATLAB语言实现的信号处理软件平台, 对接收到的高频信号进行处理. 观测结果表明, 接收机能够分析电离层回波信号的多普勒频移随时间的变化, 是获取不同空间尺度电离层扰动信息的一种有效手段. 

Design and Testing of an Ionospheric Doppler Receiver

As an important part of the Earth space environment, ionosphere variations have a very important impact on the daily life and activities and living of human beings. Ionosphere disturbance always manifests itself as a complex temporal and spatial variation process. Therefore, to strengthen the real-time monitoring of ionosphere disturbance and study the physical mechanism of the ionosphere disturbance is an important topic of space physics. Software defined radio technology is deployed to design an ionosphere Doppler receiver. Consisting of PXI bus and digital chips including DSP and FPGA, the receiver uses GPS as a module to synchronize time and frequency. Its system parameters can be set flexibly. Receiving high frequency signals from the Shanxi astronomical observatory, the receiver can get real-time ionosphere Doppler shift information caused by ionosphere disturbance. A signal processing software using MATLAB language processes the received high frequency signals. Observations show that the receiver is proved to be an effective means to obtain the ionosphere disturbance information in different spatial scales by data processing since it can analyze the change in Doppler shift of the echo signal of an ionosphere as time changes.