基于ARM与FPGA的便携式GNSS信号采集回放系统设计  

Design of portable GNSS signal capture and playback system based on ARM and FPGA

作　　者：张婉明 李琦[1] 李金海[2] 汪峰[2] 高宇 董盟 

机构地区：[1]河北工业大学电子信息工程学院,天津300401 [2]中国科学院微电子研究所,北京100029

出　　处：《电子技术应用》2016年第10期58-61,共4页Application of Electronic Technique

基　　金：国家自然科学基金(61271423);河北省自然科学基金(F2012202116)

摘　　要：设计了一种基于ARM与FPGA的便携式GNSS导航信号采集回放系统。该系统可采集复杂情况下的导航卫星信号,并且增益可控,为导航接收机测试提供了特定的信号源。系统将导航卫星信号经射频电路转换为数字中频信号,通过FPGA处理后保存至SATA硬盘。ARM处理器作为监控端发送指令至FPGA,控制FPGA进行数据采集与回放,同时接收监控接收机串口发送的报文,提取载噪比信息,并绘制载噪比柱状图。该系统ARM端基于嵌入式Linux系统开发,采用Qt4设计用户图形界面,可扩展及可移植性强,为系统的后续开发提供了保障。实验结果表明,该系统信号质量满足要求,ARM监控端数据处理时间在200 ms^500 ms之间,实时性良好。A portable GNSS navigation signal capture and playback system based on ARM and FPGA is designed. This system can capture complex navigation satellite signals, control gain, and provide a specific signal source for navigation receiver testing. This system receives satellite signals via the RF circuit which is converted to a digital IF signal, and then the data is saved to the SATA hard disk after the processing by FPGA. The ARM processor works as a monitor which send commands to the FPGA,controls the FPGA to collect and playback navigation data, and receives the packets from monitoring receiver through serial port, as well as extracts the CNR and draw the histogram. This system is based on embedded Linux, using Qt4 to design graphical user interface. It has the advantage of scalabilityes and portability, and provides a guarantee for the subsequent development.Experimental results show that the quality of signal reach the requirements. The data processing time by ARM processor is between200 ms and 500 ms which has good probability for real time application.

关 键 词：GNSS FPGA ARM 采集回放 嵌入式LINUX QT4 

分 类 号：TN965.5[电子电信—信号与信息处理]