几何产品技术规范与认证标准(Geometrical Product Specifications and Verification)中的通用GPS标准只给出矩阵模型,却没有具体的计算机实现技术方法.针对信息表达、交换与集成的要求,分析了新一代GPS标准中通用GPS标准矩阵模型对信...几何产品技术规范与认证标准(Geometrical Product Specifications and Verification)中的通用GPS标准只给出矩阵模型,却没有具体的计算机实现技术方法.针对信息表达、交换与集成的要求,分析了新一代GPS标准中通用GPS标准矩阵模型对信息分类编码的问题,对通用GPS标准矩阵的实际应用功能进行编码,构建了统一的分段式、混合结构编码结构模型,并对模型进行详细描述,以解决新一代GPS标准的软件化问题.该模型针对不同类别的信息对象,实现了各类信息对象编码结构形式的统一.展开更多
采用Trimble Net R8 GPS接收机,通过高压场地试验,研究高压输电线对GPS信号的影响。结果显示:高压输电线电晕放电产生的无线电干扰不会导致GPS接收机对卫星的失锁,不会引起载波相位观测值断记。利用高次差法和双频组合双差的方法探测周...采用Trimble Net R8 GPS接收机,通过高压场地试验,研究高压输电线对GPS信号的影响。结果显示:高压输电线电晕放电产生的无线电干扰不会导致GPS接收机对卫星的失锁,不会引起载波相位观测值断记。利用高次差法和双频组合双差的方法探测周跳,显示高压线不会使载波相位产生小于1周的周跳。研究认为,高压线对GPS L波段信号没有影响,建议勘选GPS基准站站址时,可适当放宽高压线距约束。展开更多
As the number and geometric intensity of visual satellites are susceptible to large slopes in open-pit mines, we propose integration of GPS/Pseudolites (PLs) positioning technology which can increase the number of vis...As the number and geometric intensity of visual satellites are susceptible to large slopes in open-pit mines, we propose integration of GPS/Pseudolites (PLs) positioning technology which can increase the number of visible satellites, strengthen the geometric intensity of satellites and provide a precision solution for slope deformation monitoring. However, the un-modeled systematic errors are still the main limiting factors for high precision baseline solution. In order to eliminate the un-modeled systematic error, the Empirical Mode Decomposition (EMD) theory is employed. The multi-scale decomposition and reconstruction architecture are defined here on the basis of the EMD theory and the systematic error mitigation model is demonstrated as well. A standard of the scale selection for the systematic error elimination is given in terms of the mean of the accumulated standardized modes. Thereafter, the scheme of the GPS/PLs baseline solution based on the EMD is suggested. The simulation and experiment results show that the precision factors (DOP) are reduced greatly when PLs is located suitably. The proposed scheme dramatically improves the reliability of ambiguity resolution and the precision of baseline vector after systematic error being eliminated, and provides an effective model for high precision slope deformation monitoring in open-pit mine.展开更多
文摘几何产品技术规范与认证标准(Geometrical Product Specifications and Verification)中的通用GPS标准只给出矩阵模型,却没有具体的计算机实现技术方法.针对信息表达、交换与集成的要求,分析了新一代GPS标准中通用GPS标准矩阵模型对信息分类编码的问题,对通用GPS标准矩阵的实际应用功能进行编码,构建了统一的分段式、混合结构编码结构模型,并对模型进行详细描述,以解决新一代GPS标准的软件化问题.该模型针对不同类别的信息对象,实现了各类信息对象编码结构形式的统一.
文摘采用Trimble Net R8 GPS接收机,通过高压场地试验,研究高压输电线对GPS信号的影响。结果显示:高压输电线电晕放电产生的无线电干扰不会导致GPS接收机对卫星的失锁,不会引起载波相位观测值断记。利用高次差法和双频组合双差的方法探测周跳,显示高压线不会使载波相位产生小于1周的周跳。研究认为,高压线对GPS L波段信号没有影响,建议勘选GPS基准站站址时,可适当放宽高压线距约束。
基金supported by the Research Fund of State Key Laboratory of Coal Resources and Mine safety, China University of Mining & Technology (No.08KF07) the Doctoral Fund of Ministry of Education for Young Scholar (No.200802901516)+4 种基金the Natural Science Foundation of Jiangsu Province (No.BK2009099)the Special Foundation of NSFC-DEST (No.50810076)the National Natural Science Foundation of China (No.40774010)the National Natural Science Foundation for Young Scholar (No.40904004)the Doctoral Fund of Ministry of Education of China (No.200802900501)
文摘As the number and geometric intensity of visual satellites are susceptible to large slopes in open-pit mines, we propose integration of GPS/Pseudolites (PLs) positioning technology which can increase the number of visible satellites, strengthen the geometric intensity of satellites and provide a precision solution for slope deformation monitoring. However, the un-modeled systematic errors are still the main limiting factors for high precision baseline solution. In order to eliminate the un-modeled systematic error, the Empirical Mode Decomposition (EMD) theory is employed. The multi-scale decomposition and reconstruction architecture are defined here on the basis of the EMD theory and the systematic error mitigation model is demonstrated as well. A standard of the scale selection for the systematic error elimination is given in terms of the mean of the accumulated standardized modes. Thereafter, the scheme of the GPS/PLs baseline solution based on the EMD is suggested. The simulation and experiment results show that the precision factors (DOP) are reduced greatly when PLs is located suitably. The proposed scheme dramatically improves the reliability of ambiguity resolution and the precision of baseline vector after systematic error being eliminated, and provides an effective model for high precision slope deformation monitoring in open-pit mine.
