摘要
设计了一种GNSS信号录制与回放设备,该设备利用了变频器(混频器)会产生差频与和频的现象,在采集与回放阶段使用不同的变频方式,分别使用变频结果中和频与差频,从而将频率中心较远的多个GNSS信号中间的无用频带去掉,只留下有用信号,这样以来,降低了设备的成本和复杂程度,使用价格低廉的SDR平台即可完成采集与回放工作。经实验验证,该设备可以用于GPS L1/L2以及BDS B1等信号的记录与回放,可以广泛用于教学实验、GNSS接收机研发生产以及科学研究等领域。
In this paper, a GNSS signal record and playback equipment is designed and implemented. This device takes advantage of the fact that the frequency converter（mixer） produces difference frequency and sum frequency. In the recording and playback stage, different frequency conversion methods are used, and the sum frequency and the difference frequency in the frequency conversion result are respectively used, so that the unwanted band among multiple GNSS signals with a farther frequency center is removed, only leaving a useful signal.The cost and complexity of the equipment have been reduced so that the acquisition and playback can be done using the inexpensive SDR platform. The device has been proved to be able to record and play back signals such as GPS L1/L2 and BDS B1, and can be widely used in teaching experiments, research and development of GNSS receivers, and scientific research fields.
作者
张涛
ZHANG Tao(Shool of Geodesy and Geomatics,Wuhan Univeisity,Wuhan 430079,Chin)
出处
《全球定位系统》
CSCD
2018年第3期45-50,55,共7页
Gnss World of China
基金
国家重点研发计划项目(编号:2016YFB0501803)
武汉大学实验技术项目(编号:WHU-2017-SYJS-04)
