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含缺值GNSS基准站坐标序列的非插值小波分析与信号提取
GNSS坐标时间序列 缺失数据 小波变换 信号提取
2020/6/28
受多种因素影响，GNSS基准站坐标序列通常都含有缺值，传统小波分析需要对缺值数据进行内插或补零处理。本文基于小波系数与时间序列观测数据的重构关系，提出了一种非插值的二进小波变换的最小范数解法，导出了相应的计算式，并严格证明了传统的补零处理算法与本文的最小范数解法等价。最后利用中国地壳运动观测网络一期27个基准站实测数据以及模拟数据进行了验证分析。结果表明，本文的非插值算法与插值算法提取的信号差异较...
2016年12月8日上午，由中国测绘地理信息学会大地测量与导航专业委员会和全国北斗卫星导航标准化技术委员会主办、长安大学承办的“第四届国际GNSS监测评估系统（iGMAS）技术研讨会”在西安召开，来自全国二十余家单位的100多位卫星导航领域的专家学者参加了本次研讨会。长安大学副校长沙爱民在会议上致开幕辞，向与会专家学者和代表们介绍了长安大学的基本情况和近年来在学科建设和科学研究方面的主要成绩，并对...
MONITORING HIGH-FREQUENCY OCEAN SIGNALS USING LOW-COST GNSS/IMU BUOYS
Global Navigation Satellite System (GNSS) buoys Inertial Measurement Unit (IMU) tide gauge
2016/12/1
In oceans there are different ocean signals covering the multi-frequencies including tsunami, meteotsunami, storm surge, as sea level change, and currents. These signals have the direct and significan...
CENTIMETER-LEVEL, ROBUST GNSS-AIDED INERTIAL POST-PROCESSING FOR MOBILE MAPPING WITHOUT LOCAL REFERENCE STATIONS
Differential GNSS Sensor Orientation Mobile Mapping GNSS-Aided Inertial Georeferenicng Airborne Mapping Direct Geroeferencing PPP
2016/7/28
For almost two decades mobile mapping systems have done their georeferencing using Global Navigation Satellite Systems (GNSS) to measure position and inertial sensors to measure orientation. In order ...
CONTINUOUS MAPPING OF TUNNEL WALLS IN A GNSS-DENIED ENVIRONMENT
Tunnel mapping image mosaicking image bridging visual odometry GNSS-denied
2016/7/27
The need for reliable systems for capturing precise detail in tunnels has increased as the number of tunnels (e.g., for cars and trucks, trains, subways, mining and other infrastructure) has increased...
ON THE EVALUATION OF GNSS COMPLEMENTARY BY USING QUASIZENITH SATELLITE OF JAPAN
GNSS QZS GNSS Complementary GNSS Augmentation
2016/7/5
The positional information has an important role in our lifestyle. People need to get positional information by GNSS. The satellite positioning must receive a signal from four or more satellites, howe...
Global Navigation Satellite Systems (GNSS) were initially developed in the early seventies to improve global positioning and navigation from space. The Global Positioning System (GPS) was the first sy...
2015年10月中旬开始，国际IGS(International GNSS Service)组织正式向全球用户发布由中国科学院测量与地球物理研究所(IGG)研究员袁运斌及其团队研制的北斗/GNSS差分码偏差(DCB)产品。测地所成为继德国宇航中心(DLR)之后，全球第二家向IGS提交多系统DCB产品的机构。
基于格论的GNSS模糊度解算
GNSS 模糊度解算 降相关 格论 格基规约 Bootstrapping成功率
2012/12/25
快速、准确地解算整周模糊度是实现GNSS载波相位实时高精度定位的关键，由于模糊度之间的强相关，基于整数最小二乘估计准则时，需要较长的时间才能搜索出最优的整周模糊度向量。为了提高模糊度的搜索效率，本文在扼要介绍格论的理论框架基础上，引入基于格论的模糊度解算方法，通过格基规约来降低模糊度之间的相关性，从而快速搜索出最优的整数模糊度向量。与此同时，将GNSS领域的主要降相关方法统一到格论框架下，探讨了并...
A WEB PROCESSING SERVICE FOR GNSS REALISTIC PLANNING
GIS Planning GPS/INS Internet Services
2014/6/12
The spread presence of GNSS Permanent Station Networks makes satellite surveys simpler, quicker and cheaper, and the achievement of high precisions easier. However, the result of a GNSS campaign benef...