共查询到19条相似文献,搜索用时 140 毫秒
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利用研制的GNSS浮标,在海南省清澜湾进行了21.5 h的潮位测量工作,分别使用GAMIT+TRACK和精密单点定位技术(PPP)两种方法对GNSS数据进行解算,并对高频GNSS解算结果进行了巴特沃斯、低通滤波、中值滤波、小波滤波等处理,处理结果与实测潮位数据进行了对比。结果表明:(1)使用GNSS浮标可以进行潮位测量;(2)移动平均滤波或中值滤波对高频GNSS浮标解算数据的处理结果较好,其次为巴特沃斯滤波,小波滤波处理结果较差;(3)在GNSS基准站的支持下,GAMIT+TRACK对GNSS解算结果精度可达1.065 cm,并可以给出绝对高程下的潮位信息;PPP技术解算结果的精度为4.283 cm,但不需要GNSS基准站的支持,可用于远海潮位测量。 相似文献
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目前IGS共提供6类精度和时效性不同的精密星历产品,为了验证不同精度和时效性的IGS精密星历产品在海洋测绘中的适用情况,使用6类不同的IGS精密星历产品,分别对固定点观测数据和海上浮动点观测数据进行精密单点定位解算,并对解算结果分别进行比对分析和统计。固定点比对结果表明,IGS和IGR精密星历精密单点定位解算在平面位置方向均能达到平均8厘米的外符合精度,IGU00至IGU18精密单点定位解算精度稍差,平面外符合精度在10~13cm,且精度随着发布时间的推迟而提高;PPP潮位的解算结果表明,从IGS至IGU18,高程方向的解算精度相当,和固定潮位站的数据相比,均方根差在16~18cm。 相似文献
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分别采用非差无电离层组合模型与非差非组合模型进行批量静态定位解算,对比两者的定位精度以及ZPD估计精度。设计并实现两种模型的并行解算方法,提高非差模型的计算效率。大网数据实验结果表明,两种模型定位精度基本一致,非差非组合ENU的3个方向平均偏差为(4.2,2.8,6.6)mm,组合模型的平均偏差为(4.0,2.8,6.3)mm,但非差非组合模型的解算更加耗时,约是组合模型计算时间的1.4倍。多核环境下,两种模型的并行解算效率均比传统串行模型得到了提高。结果表明,双核并行和四核并行的计算效率比单核串行计算均分别提高了40%和60%以上。 相似文献
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文章针对海上风电工程结构安全监测的需求,在系统回顾了目前的主要监测现状及存在的监测难点的基础上,初步构建了水上、水下一体化安全监测体系基础框架,阐述了主要的工作流程,重点探讨了海上风电工程安全监测中的精密单点定位(PPP)技术、高程传递、多传感器集成、精密水下定位技术、水下摄像机标校、水下三维激光点云快速建模、水下桩基全景影像与点云数据匹配、多波束与侧扫声呐数据融合等关键技术,以期为海上风电工程结构设施管控、变化监控和防灾减灾提供新的应急方案和技术支撑。 相似文献
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The IGS Real-time Pilot Project (IGS-RTPP) provides real-time precise orbits and clocks, which support real-time positioning for single stations over large areas using the Precise Point Positioning (PPP) technique. This paper investigates the impact of real-time orbits, network configuration, and analysis strategies on real-time PPP implementation and demonstrates the real-time PPP performance. One month of data from the IGS network is analyzed in a real-time simulation mode. Results reveal the following: (1) In clock estimation, differential approaches are much more efficient than the zero-differenced approach. (2) The precision of IGS Ultra rapid (IGU) orbits could meet the IGS-RTPP requirement for precise clock estimation and PPP positioning. (3) Considering efficiency and precision, a network with 50 stations is recommended for the IGS-RTPP. It is demonstrated that the real-time satellite clock precision is 0.1 ns supporting hourly static PPP with a mean precision of 2–3 cm in the North component and 3–4 cm in the other components. Kinematic PPP assessed with onboard GPS data collected from a buoy provided mean coordinate precision of 2.2, 4.2, 6.1 cm in the North, East and Up directions, compared to the RTK solutions. 相似文献
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ABSTRACTWithout landing on islands, reefs, or facilities, fast locating targets by the reflectorless ranging integrated with Global Navigation Satellite System (GNSS) has a wide range of application. We propose a nonlinear robust location method and modify current nonlinear estimators for achieving shipborne laser ranging positioning of high precision. The Newton method is recommended as a nonlinear estimator for shipborne ranging positioning since the Gauss–Newton method occasionally fails in critical cases when the control points and the unknown point are approximately coplanar. However, it shows that the vertical positioning based on the shipborne laser ranging is generally of low precision, while the vertical angle measurement is used to further remedy this deficiency. The positioning precision and reliability might be significantly decreased with the increased number of gross errors in the observations that are dynamically implemented on a moving shipborne platform; thus a weighting scheme with high breakdown point is recommended to set the preliminary weights, and then Scheme III of the Institute of Geodesy and Geophysics of China (IGGIII) is applied to iteratively updating the weights of distance observations. It shows that the proposed method based on the angle-distance observational data fusion can be used to achieve a three-dimensional positioning of high precision. 相似文献