北斗系统测距码与载波一致性评估与验证

发布时间：2018-05-17 22:32

本文选题：测距码与载波一致性 + 伪码-载波偏离度监测器　；参考：《中国民航大学》2017年硕士论文

【摘要】：全球导航卫星系统(Global Navigation Satellite System,GNSS)接收机对每颗卫星产生测距码和载波相位两个基本距离观测值。由于受电离层延迟效应、多路径的影响,或者由于卫星发射源工作性能不理想等因素的影响,导航信号的测距码与载波表现出不同的传输特性,导致同一颗卫星在同一频率上相邻两个历元的测码伪距的增量与该相邻两个历元测相伪距的增量不一致。测距码与载波的一致性评估对于监测卫星信号质量,使其满足导航定位精度和可靠性需求至关重要。针对这一问题,论文开展基于北斗系统的测距码与载波一致性评估与验证。主要内容如下:(1)设计北斗系统测距码与载波一致性评估整体方案,分析伪码-载波偏离度(Code-Carrier Divergence,CCD)监测器的设计思想,按照CCD模型的具体组成,给出CCD监测值以及检测门限的数学描述,并针对单点多系统多频接收机接收的北斗系统原始观测数据进行实验处理。(2)基于多频组合观测值方法,对北斗系统原始观测数据进行预处理,实现整周模糊度的确定,以及周跳的探测与修复,通过实验,验证多频组合观测值方法理论分析的正确性。(3)利用卡尔曼滤波法对卫星和接收机硬件延迟偏差进行估算,通过实验具体给出各颗卫星的硬件延迟偏差结果。(4)针对电离层的两种不同状态,分别选择不同的方法对北斗系统测距码与载波一致性进行评估。实验验证北斗系统各颗卫星不同频率上测距码与载波一致性偏差是否达到国际民航组织(International Civil Aviation Organization,ICAO)对码载波发散的要求。
[Abstract]:The global Navigation Satellite system GNSS receiver generates two basic distance observations for each satellite, ranging code and carrier phase. Because of the effect of ionospheric delay, multipath, or the poor performance of satellite transmitter, the ranging code of navigation signal shows different transmission characteristics from carrier. As a result, the increment of the code pseudo-range between two adjacent epochs on the same frequency is inconsistent with the increment of the pseudo-range measured by the adjacent two epochs. The consistency evaluation of ranging code and carrier is very important to monitor the quality of satellite signal and make it meet the requirements of navigation accuracy and reliability. In order to solve this problem, this paper carries out the range code and carrier consistency evaluation and verification based on Beidou system. The main contents are as follows: (1) the overall scheme for evaluating the range code and carrier consistency of Beidou system is designed, and the design idea of the pseudo-code-carrier deviation monitor is analyzed. According to the concrete composition of the CCD model, The mathematical description of CCD monitoring value and detection threshold is given, and the experimental processing of the original observation data of Beidou system received by a single point and multi-system multi-frequency receiver is carried out. The original observation data of Beidou system are preprocessed to determine the ambiguity of whole cycle, and to detect and repair the cycle slip. To verify the correctness of the theoretical analysis of the multi-frequency combined observation method. (3) using Kalman filtering method to estimate the delay deviation of satellite and receiver hardware. The result of hardware delay deviation of each satellite is given. (4) aiming at two different states of ionosphere, different methods are selected to evaluate the consistency of ranging code and carrier in Beidou system. It is verified by experiments that the deviation of ranging code and carrier consistency on different frequencies of Beidou satellite meets the requirements of ICAO International Civil Aviation Organization (ICAO) for code carrier divergence.
【学位授予单位】：中国民航大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN967.1

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