Abstract—

Global Navigation Satellite System (GNSS) software-defined radio (SDR) is a programmable software receiver, primarily used to receive satellite data and provide user position. It is flexible and cost-effective compared to conventional satellite receivers. In GNSS SDR, recording the live raw data in real-time is a challenging task as large data are sent by the satellites at a very high speed. These data are further processed by the baseband algorithms which provide the user location. The accuracy of the tracked location depends on the precision of the data captured. Among the available hardware receivers, USRP RF front end kit provides flexibility. This paper proposes an efficient approach to capture the real-time GPS data by using the USRP N210 kit. If the receiver is not tuned with the exact parameters, the problems of data overflow and underflow occur. A novel data controlling queue thread method is introduced to overcome this problem. It is evident that the results obtained from our method are very close to those of Ublox GPS.

中文翻译：

---

针对GNSS SDR应用的改进的实时GPS RF数据捕获

摘要—

全球导航卫星系统（GNSS）软件定义的无线电（SDR）是可编程的软件接收器，主要用于接收卫星数据并提供用户位置。与传统的卫星接收机相比，它具有灵活性和成本效益。在GNSS SDR中，实时记录实时原始数据是一项艰巨的任务，因为大数据是由卫星以很高的速度发送的。这些数据由提供用户位置的基带算法进一步处理。跟踪位置的精度取决于所捕获数据的精度。在可用的硬件接收器中，USRP RF前端套件提供了灵活性。本文提出了一种使用USRP N210套件捕获实时GPS数据的有效方法。如果接收器的参数不正确，发生数据上溢和下溢的问题。为了克服这个问题，提出了一种新颖的数据控制队列线程方法。显然，从我们的方法获得的结果与Ublox GPS的结果非常接近。