基于区域CORS网的卫星钟差实时估计及其应用
发布时间：2018-10-14 19:54
【摘要】：经过十几年的发展，精密单点定位（PPP）技术取得了长足进步，已成熟应用在高精度定位测量、低轨卫星精密定轨、地壳形变动态监测等方面，目前已经成为GPS导航和定位的研究热点。 目前实时动态精密单点定位技术应用需求与价值较大，但因其受制于卫星钟差的精度与滞后，并未得到广泛应用。因此,基于区域GPS观测网络，系统研究精密卫星钟差解算方法，改善精密卫星钟差精度和时效性，对精密单点定位技术的实时应用具有重要的研究意义和应用价值。同时，随着1Hz、50Hz接收机的相继出现，GPS观测值采样率不断提高，故对定位解算所需的轨道产品和钟差产品提出了更高的要求，同时还需不断完善和优化数据处理算法，以保证定位结果的正确性与时效性。因此高采样率卫星钟差求解方法的研究，也成了当今GPS数据处理的一个前沿发展趋向。当前许多国家和地区建立了全球或局部性的实时参考站网络，针对每天成百上千个跟踪站日常数据准实时处理工作，很有必要开发一套程序，当用户接收到GPS观测数据就能进行高精度、自动化解算,提高数据解算的时效性。 本文基于区域CORS网GPS连续跟踪站观测数据与IGU轨道预报部分，采用非差无电离层观测模型进行了实时卫星钟差估计，并对所估计得到的实时钟差、实时定位结果分别进行了比较、分析，实验结果表明：实时钟差与IGS最终钟差产品相比，其精度可以达到±0.2ns，实时定位精度水平方向优于±1cm，垂直方向优于±2cm。同时开发了一套GPS实时数据自动化处理程序，它可以自动下载与数据解算相关的其他数据，并提取解算所需的相关准备文件，然后按照选定模式实现自动解算，使繁琐的人工手动处理转换为自动化的无人操作处理，提高数据解算的时效性。最后提出了一种改进的混合模型高采样率卫星钟差求解方法，能获得较好的钟差精度，从而验证了该方法的有效性与可行性，具有一定的实用价值与研究意义。
[Abstract]:With the development of more than ten years, the (PPP) technology of precise single point positioning has made great progress, and has been used in high precision positioning and surveying, precision orbit determination of low-orbit satellites, dynamic monitoring of crustal deformation, etc. At present, it has become the research hotspot of GPS navigation and positioning. At present, the application requirement and value of real-time dynamic precise single point positioning technology is great, but it has not been widely used because it is restricted by the precision and lag of satellite clock error. Therefore, based on the regional GPS observation network, it is of great significance and value to study the precision satellite clock difference calculation method systematically, to improve the precision satellite clock difference accuracy and time efficiency, and to apply the precise single point positioning technology in real time. At the same time, with the emergence of 1Hz / 50Hz receiver, the sampling rate of GPS observation value increases continuously. Therefore, higher requirements are put forward for the orbit products and clock difference products needed for positioning calculation. At the same time, it is also necessary to improve and optimize the data processing algorithm. To ensure the accuracy and timeliness of positioning results. Therefore, the solution of satellite clock difference with high sampling rate has become a forward trend of GPS data processing. At present, many countries and regions have established a global or local network of real-time reference stations. It is necessary to develop a set of programs for the quasi-real-time processing of daily data from hundreds of tracking stations every day. When the user receives the GPS observation data, it can carry out high precision, automatic solution and improve the time-efficiency of the data solution. Based on the observation data of GPS continuous tracking station in regional CORS network and the prediction of IGU orbit, the real time satellite clock error estimation is carried out by using the nondifferentially ionospheric observation model, and the real time clock error is estimated. The results of real time positioning are compared and analyzed. The experimental results show that the accuracy of real time clock difference can reach 卤0.2 ns, the horizontal direction is better than 卤1 cm, and the vertical direction is better than 卤2 cm. At the same time, a set of GPS real-time data automatic processing program is developed, which can automatically download other data related to the data solution, extract the relevant preparation files for the solution, and then realize the automatic solution according to the selected mode. The complicated manual processing is converted into the automatic unattended processing, which improves the timeliness of the data solution. In the end, an improved method for solving satellite clock difference with high sampling rate is proposed, which can obtain better clock error accuracy, which verifies the validity and feasibility of the method, and has certain practical value and research significance.
【学位授予单位】：中国地震局地震研究所
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P228.4
[Abstract]:With the development of more than ten years, the (PPP) technology of precise single point positioning has made great progress, and has been used in high precision positioning and surveying, precision orbit determination of low-orbit satellites, dynamic monitoring of crustal deformation, etc. At present, it has become the research hotspot of GPS navigation and positioning. At present, the application requirement and value of real-time dynamic precise single point positioning technology is great, but it has not been widely used because it is restricted by the precision and lag of satellite clock error. Therefore, based on the regional GPS observation network, it is of great significance and value to study the precision satellite clock difference calculation method systematically, to improve the precision satellite clock difference accuracy and time efficiency, and to apply the precise single point positioning technology in real time. At the same time, with the emergence of 1Hz / 50Hz receiver, the sampling rate of GPS observation value increases continuously. Therefore, higher requirements are put forward for the orbit products and clock difference products needed for positioning calculation. At the same time, it is also necessary to improve and optimize the data processing algorithm. To ensure the accuracy and timeliness of positioning results. Therefore, the solution of satellite clock difference with high sampling rate has become a forward trend of GPS data processing. At present, many countries and regions have established a global or local network of real-time reference stations. It is necessary to develop a set of programs for the quasi-real-time processing of daily data from hundreds of tracking stations every day. When the user receives the GPS observation data, it can carry out high precision, automatic solution and improve the time-efficiency of the data solution. Based on the observation data of GPS continuous tracking station in regional CORS network and the prediction of IGU orbit, the real time satellite clock error estimation is carried out by using the nondifferentially ionospheric observation model, and the real time clock error is estimated. The results of real time positioning are compared and analyzed. The experimental results show that the accuracy of real time clock difference can reach 卤0.2 ns, the horizontal direction is better than 卤1 cm, and the vertical direction is better than 卤2 cm. At the same time, a set of GPS real-time data automatic processing program is developed, which can automatically download other data related to the data solution, extract the relevant preparation files for the solution, and then realize the automatic solution according to the selected mode. The complicated manual processing is converted into the automatic unattended processing, which improves the timeliness of the data solution. In the end, an improved method for solving satellite clock difference with high sampling rate is proposed, which can obtain better clock error accuracy, which verifies the validity and feasibility of the method, and has certain practical value and research significance.
【学位授予单位】：中国地震局地震研究所
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P228.4
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