GPS双频接收机捕获技术研究
发布时间：2019-03-27 14:39
【摘要】：随着卫星导航技术不断地发展,特别是GPS现代化信号的不断提出和改进,双频接收机越来越成为研究的重点和热点。双频接收机能够消除电离层干扰,提高定位精度和有效对抗多径效应。本文将对双频捕获中的一些关键问题进行分析和研究。 本文针对双频接收机的信号模型,分析了双频捕获的捕获关键技术,针对双频捕获中遇到的比特翻转问题,提出了一种BTC算法有效克服比特翻转问题的方法。针对在FPGA系统上双频捕获的资源消耗大,提出了一种优化的相关器实现结构。本文的主题章节包括以下几个方面： (1)从GPS双频信号以及PRN码的相关特性出发,介绍了GPS双频接收机模型,分析了基带信号处理器的核心模块相关器的输出特性。 (2)针对双频信号的特点,给出了GPS双频接收机的捕获系统处理流程,介绍了两种L2C码的捕获算法,分析了两种提升检测信噪比的方法。最后通过公式推导和仿真提出了各种制约因素。 (3)针对长时间相干积分中的比特翻转问题,我们提出了一种BTC方法。针对L2C捕获在硬件资源上的消耗过高以及BTC方法,我们提出了一种优化的相关器结构,使得加法器最多能够节省91%。 (4)针对捕获的提升信噪比技术和BTC方法的性能,我们分析了检测和判决技术,并且详细分析了非相干积分,相干积分和BTC方法的检测性能。 (5)描述了基于FPGA的全数字GPS双频接收机的实现方案,给出了工程中捕获系统的性能测试和实际测试结果。
[Abstract]:With the continuous development of satellite navigation technology, especially the development and improvement of modern GPS signal, dual-frequency receiver has become the focus and focus of research. Dual-frequency receiver can eliminate ionospheric interference, improve positioning accuracy and effectively combat multipath effect. In this paper, some key problems in dual-frequency acquisition are analyzed and studied. In this paper, according to the signal model of dual-frequency receiver, the acquisition key technology of dual-frequency acquisition is analyzed. Aiming at the bit-flipping problem encountered in dual-frequency acquisition, a BTC algorithm is proposed to overcome the bit-flipping problem effectively. In view of the high resource consumption of dual-frequency acquisition in FPGA system, an optimized correlator architecture is proposed. The main topics of this paper include the following aspects: (1) based on the correlation characteristics of GPS dual-frequency signal and PN code, the GPS dual-frequency receiver model is introduced, and the output characteristics of the correlator of the core module of baseband signal processor are analyzed. (2) according to the characteristics of dual-frequency signal, the process flow of acquisition system of GPS dual-frequency receiver is given, two acquisition algorithms of L2C code are introduced, and two methods to improve the detection signal-to-noise ratio are analyzed. Finally, various restriction factors are put forward through formula derivation and simulation. (3) for the problem of bit flipping in long-time coherent integrals, we propose a BTC method. In view of the high consumption of L2C capture on hardware resources and the BTC method, we propose an optimized correlator structure, which can save up to 91% of the adder. (4) in view of the performance of the captured lifting signal-to-noise ratio (SNR) technique and the BTC method, we analyze the detection and decision techniques, and analyze the detection performance of the incoherent integration, coherent integration and BTC methods in detail. (5) the realization scheme of all-digital GPS dual-frequency receiver based on FPGA is described, and the performance test and practical test results of the acquisition system in engineering are given.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P228.4
本文编号：2448271
[Abstract]:With the continuous development of satellite navigation technology, especially the development and improvement of modern GPS signal, dual-frequency receiver has become the focus and focus of research. Dual-frequency receiver can eliminate ionospheric interference, improve positioning accuracy and effectively combat multipath effect. In this paper, some key problems in dual-frequency acquisition are analyzed and studied. In this paper, according to the signal model of dual-frequency receiver, the acquisition key technology of dual-frequency acquisition is analyzed. Aiming at the bit-flipping problem encountered in dual-frequency acquisition, a BTC algorithm is proposed to overcome the bit-flipping problem effectively. In view of the high resource consumption of dual-frequency acquisition in FPGA system, an optimized correlator architecture is proposed. The main topics of this paper include the following aspects: (1) based on the correlation characteristics of GPS dual-frequency signal and PN code, the GPS dual-frequency receiver model is introduced, and the output characteristics of the correlator of the core module of baseband signal processor are analyzed. (2) according to the characteristics of dual-frequency signal, the process flow of acquisition system of GPS dual-frequency receiver is given, two acquisition algorithms of L2C code are introduced, and two methods to improve the detection signal-to-noise ratio are analyzed. Finally, various restriction factors are put forward through formula derivation and simulation. (3) for the problem of bit flipping in long-time coherent integrals, we propose a BTC method. In view of the high consumption of L2C capture on hardware resources and the BTC method, we propose an optimized correlator structure, which can save up to 91% of the adder. (4) in view of the performance of the captured lifting signal-to-noise ratio (SNR) technique and the BTC method, we analyze the detection and decision techniques, and analyze the detection performance of the incoherent integration, coherent integration and BTC methods in detail. (5) the realization scheme of all-digital GPS dual-frequency receiver based on FPGA is described, and the performance test and practical test results of the acquisition system in engineering are given.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P228.4
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