GPS长基线数据处理软件系统分析与实现

发布时间：2019-01-23 20:48

【摘要】：GPS长基线数据处理软件是一个非常复杂的系统,CGO作为一款高精度的GPS数据处理软件,简化了高精度GPS数据处理的繁琐过程,但是系统在集成初期仍遗留一些问题。本文在研究GPS高精度数据处理理论的基础上,针对CGO基线数据处理软件进行部分集成优化,包括：模糊度固定率,基线解算精度,平差功能,运算速度,辅助功能模块等。在分析原CGO系统平台的基础上,提出一套优化解决方案,研究的主要内容和成果包括以下几个方面： 1：在集成之初的平台上,开发出几类平差模块,具体包括三维无约束平差、三维约束平差、二维约束平差,如今的平台集基线处理与网平差功能于一体。 2：设计了丰富的辅助功能模块,降低了高精度GPS数据处理软件的复杂性,例如坐标转换,时间转换,数据预处理,天线自动纠错,Google地图以及效果更好的可视化界面。 3：通过几套对比测试方案进行了系统性能优化测试,具体包括短基线、中长基线、长基线、带状混合网四个具有一定代表性的实验,将CGO得到的基线处理结果与GAM IT比较,将CGO约束平差得到的结果与COSA_GPS比较。 4：对影响精密定位的实验因子进行分析研究,本文主要研究了星历精度对基线解算的影响,通过实验发现目前的快速精密星历在非特殊要求的情况下完全可以替代精密星历；研究天线PCV值对定位的影响,通过实验发现天线PCV对长基线解算影响较大,对中短基线的影响较之于长基线小,当使用同种天线且为中短基线基本可以忽略接收机天线PCV值对基线解算的影响；研究截止高度角对基线解算的影响,发现10。高度角得到的定位结果优于5。与25。；研究不同观测时间对定位结果的影响,通过实验发现当观测时间达到10小时,定位精度基本趋向稳定,再延长观测时间对提高定位精度作用不大；研究不同观测时段对定位结果的影响,发现观测时间处于晚上的定位精度略好于白天；研究采样率对定位结果的影响,发现采样率为30s和60s得到的定位结果基本一致。
[Abstract]:GPS long baseline data processing software is a very complex system. As a high-precision GPS data processing software, CGO simplifies the tedious process of high-precision GPS data processing, but it still leaves some problems in the early stage of system integration. Based on the research of GPS high precision data processing theory, this paper makes partial integration optimization for CGO baseline data processing software, including: fixed ambiguity rate, baseline resolution accuracy, adjustment function, operation speed, auxiliary function module and so on. Based on the analysis of the original CGO system platform, a set of optimization solution is put forward. The main contents and results of the research include the following aspects: 1. On the platform of the beginning of integration, several kinds of adjustment modules are developed. It includes three dimensional unconstrained adjustment, three dimensional constraint adjustment and two dimensional constraint adjustment. Now the platform integrates the function of baseline processing and network adjustment. 2. Abundant auxiliary function modules are designed to reduce the complexity of high-precision GPS data processing software, such as coordinate conversion, time conversion, data preprocessing, antenna automatic error correction, Google map and better visual interface. 3: the system performance optimization test is carried out through several contrast test schemes, including four typical experiments, including short baseline, medium and long baseline, and banded hybrid network. The results of baseline processing obtained by CGO are compared with those of GAM IT. The results obtained by CGO constraint adjustment are compared with those obtained by COSA_GPS. 4: the experimental factors that affect precision positioning are analyzed. In this paper, the influence of ephemeris precision on baseline solution is studied. It is found that the current rapid precision ephemeris can replace the precise ephemeris without special requirements. The effect of antenna PCV value on positioning is studied. It is found that antenna PCV has a greater influence on the solution of long baseline, and has less effect on medium and short baseline than on long baseline. The influence of receiver antenna PCV value on the baseline solution can be ignored when the same antenna is used and is a medium and short baseline. The effect of cutoff height angle on baseline solution is studied, and it is found that 10. 5%. The result of height angle is better than that of 5. The experimental results show that when the observation time reaches 10 hours, the positioning accuracy tends to be stable, and the extension of observation time has little effect on the improvement of positioning accuracy. By studying the effect of different observation periods on the positioning results, it is found that the positioning accuracy of the observation time is slightly better than that of the daytime, and the sampling rate has the same effect on the positioning results, and the results obtained at the sampling rates of 30s and 60s are basically the same.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P228.4

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