bd2卫星信号快速捕获技术分析word格式论文.docxVIP

优秀毕业论文 精品参考文献资料 ABSTRACT This paper proposes a fast acquisition and detection algorithm, the algorithm uses (PMF + FFT) algorithm, to realize the parallel search of Doppler domain, mainly used the algorithm on the BD-2 satellite signal fast acquisition, the success has solved the BD-2 high sen sitivity receiver two technical difficulties： fast acquisition techniques of the 1 signal; 2 weak signal detection technology. This paper describes a GPS satellite signal model, and capture the various problems encountered in the signals. Back detailed calculation of the acquisition algorithm performance theory, and channel matlab simulation validation. The fourth and fifth chapters describe the mechanism and collect for detection of weak signal acquisition, and use FPGA to complete the project, and introduces the use of various in capture algorithm optimization method, the results are given finally In this paper, through theoretical analysis and simulation results prove that the algorithm has good working performance, with the economy and feasibility of high in the project realization. Keywords： part of the matched filtering with FFT fast capture technology weak signal detection high sensitivity receiver BD- BD-2 卫星信号快速捕获技术研究 5.3.7 峰值检测单元(max_tong)： 46 5.3.8 复检测单元（corr_dectet） 49 5.3.9 topcontrl 模块： 52 第六章 结 论 致 谢 参考文献 55 57 59 目 录 目 录 第一章 绪论 1 HYPERLINK \l _TOC_250005 第二章 GPS 系统原理 5 2.1 扩频通信 5 HYPERLINK \l _TOC_250004 2.2 GPS 系统的组成 6 HYPERLINK \l _TOC_250003 2.3 GPS 定位的基本原理 8 HYPERLINK \l _TOC_250002 2.4 GPS 信号的特点 8 HYPERLINK \l _TOC_250001 第三章 基于 PMF+FFT 捕获算法研究 13 3.1 引言 13 HYPERLINK \l _TOC_250000 3.2 PMF+FFT 捕获算法原理和性能 14 PMF+FFT 算法原理 14 PMF+FFT 算法捕获性能 15 3.3 弱信号检测算法 17 3.3.1 数据电文翻转的影响和补偿 18 3.3.2 残余多普勒的补偿 19 3.3.3 码相位未对齐的影响和补偿 20 第四章 C/P 码捕获机制设置 23 4.1 C 码捕获原理 23 GEO 卫星捕获 23 MEO/IGSO 卫星捕获： 26 4.2 P 码直捕机制设计 28 4.2.1 P 码直捕的基本原理 28 4.2.2 P 码直捕的实现机制 29 第五章 捕获过程的 FPGA 的实现 37 5.1 引言 37 5.2 捕获模块程序设计 37 5.2.1 捕获单元程序划分 37 5.2.2