可重构GPS射频采样接收机的实验验证

Hanen Mehrez, R. Barrak, A. Ghazel, M. Muller, G. Abib
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引用次数: 2

摘要

在无线GNSS导航中,对能够提高性能和降低复杂性的潜在多标准接收机有很高的要求。集成基于射频采样(RFS)的新型结构是提高定位精度的关键。本文对这种新型结构进行了介绍、分析并采用离散元件实现。值得注意的是,所建议的体系结构具有以样本、灵活和经济的方式重新配置的潜力。为了评估设计的接收机的操作和功能,完成了实验测试。阐述了三种信号:1)播放再现原始信号的录制信号;可以将信号记录在独立设备上,如思博伦系统;2)由罗德与施瓦茨系统模拟信号,包括卫星(4,10,31)的PRN编码;3)在测试GPS天线信号时使用真实的GPS L1星座。测试的GPS射频信号假设L1 (fc=1575.42 Mhz)和L2 (fc=1227.6MHz)频段的值,以随射频信号输入而变化的采样频率(Fs)向下转换为中频信号(FIF)。通过采用并行码相位搜索获取算法(PCPA)获取射频前端和带通采样(BPS) ADC器件的所得信号,该算法可以确定可见卫星,然后跟踪并使用它们进行定位。实验灵敏度为- 110 dBm,思博伦模拟器为- 95 dBm
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental Validation of a Reconfigurable GPS RF Sampling Receiver
In Wireless GNSS navigation, there is a high demand for a potential multi-standard receiver capable to improve the performance and decrease the complexity. The key solution to achieve a better accuracy position is to integrate new structure based on RF sampling (RFS). In this paper, this novel structure is introduced, analyzed and implemented using discrete components. Notably, the proposed architecture has the potential to be reconfigured in a sample, flexible and cost-effective manner. To evaluate the operational and the functionality of the designed receiver, experimental tests are accomplished. Three kinds of signals are expound 1) recorded signals reproducing the original ones are played. It can be arranged in such a way that signal is recorded on a standalone device, such as the one by Spirent system 2) simulated signals arranged by the Rohde & Schwarz systems including PRN code of satellites (4,10,31) 3) using a real constellation of GPS L1 while testing signals from GPS antenna. The GPS RF signal tested which assume values in band L1 (fc=1575.42 Mhz) and L2 (fc=1227.6MHz) is down converted to intermediate frequency signals (FIF) at a rate sampling frequency (Fs) varied with the RF signal’s input. The resulting signal crossing the RF front end and a BandPass sample (BPS) ADC device is acquired by employing the parallel code phase search acquisition algorithm (PCPA) which can determine visible satellites then tracked and used them for positioning. The experimental sensitivity measured for the R&S is −110 dBm and −95 dBm for Spirent simulator
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