Real-Time Digital Signal Processing-Based Algorithm for Universal Software Radio Peripheral to Detect GPS Signal

E. Sheybani
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Abstract

Software-defined radios (SDR) are gradually becoming a practical option for implementing RF communication systems due to their low cost, off-the-shelf availability, and flexibility. Although the analog limitations of the hardware devices in these systems create barriers to some applications, creative algorithms in digital signal processing (DSP) can improve the results. In some cases, this improvement is essential to establishing a robust and reliable communication. The universal software radio peripheral (USRP) is a popular hardware that can be used alongside the SDR. Among many capabilities of USRP and its changeable daughter boards is receiving GPS signals. The GPS satellites transmit data on two main frequencies, L1 (1575.42 MHz) and L2 (1227.60 MHz). In this chapter, the focus is on describing a detailed implementation of the real-time DSP-based algorithm for USRP to detect GPS signal, namely the L1 band that transmits at 1575.42 MHz.
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基于实时数字信号处理的通用软件无线电外设GPS信号检测算法
软件定义无线电(SDR)由于其低成本、现成可用性和灵活性,正逐渐成为实施射频通信系统的实用选择。尽管这些系统中硬件设备的模拟限制对某些应用造成了障碍,但数字信号处理(DSP)中的创造性算法可以改善结果。在某些情况下,这种改进对于建立健壮和可靠的通信至关重要。通用软件无线电外设(USRP)是一种流行的硬件,可以与SDR一起使用。USRP及其可变子板的众多功能之一是接收GPS信号。GPS卫星以两个主要频率L1 (1575.42 MHz)和L2 (1227.60 MHz)传输数据。在本章中,重点描述了USRP检测GPS信号(即L1频段,传输频率为1575.42 MHz)的基于dsp的实时算法的详细实现。
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