共查询到17条相似文献，搜索用时 125 毫秒
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基于矢量重力测量数学模型，仿真了一段5000S的飞行过程，模拟了其SINS／GPS数据。详细描述了捷联惯性导航系统(SINS)中加速度计和陀螺数据仿真的方法，并给出了求解扰动重力的算法。仿真结果显示卡尔曼滤波器能有效地抑制误差积累。仿真的SINS／GPS数据可用于航空矢量重力测量的算法研究。 相似文献
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首先论述了航空矢量重力测量中科里奥利加速度的计算模型，给出了科里奥利加速度改正对水平、垂直速度要求的分析模型。数值表明，在低纬地区欲达到1mGal的科里奥利加速度的精度，要求速度的精度为5cm／s左右；依据实测数据，目前GPS测得的载体速度精度为0．3mm／s，完全能够满足航空矢量重力测量对科里奥利加速度改正的要求。 相似文献
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多型航空重力仪同机测试及其数据分析 总被引：3，自引：0，他引：3
介绍了运8飞机加装4型5套航空重力仪开展同机测试的整体情况,对5套重力仪所获取的重复线和测网成果数据进行了对比分析。试验结果表明,俄罗斯GT-1A航空重力仪具有最佳的综合性能技术指标,平差前测量精度为±2.45mGal;美国TAGS航空重力仪为其次,平差前测量精度为±3.9mGal;SII型船载海空重力仪可改造升级为航空重力仪,并具有与TAGS同等的综合性能技术指标;国内自主研发的SGA-WZ01捷联航空重力仪具有最佳的重复线测量精度,测网精度接近于GT-1A航空重力仪水平,平差前测量精度为±2.96mGal,另一款自主研制的GDP-1重力仪首次成功实现了航空重力测量功能,平差前测量精度为±4.52mGal。 相似文献
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Silja Märdla Jonas Ågren Gabriel Strykowski Tõnis Oja Artu Ellmann René Forsberg 《Marine Geodesy》2017,40(6):416-453
The deduction of a regularly spaced gravity anomaly grid from scattered survey data is studied, addressing mainly two aspects: reduction of gravity to anomalies and subsequent interpolation by various methods. The problem is illustrated in a heterogeneous study area and contrasting test areas including mountains, low terrains, and a marine area. Provided with realistic error estimates, Least Squares Collocation interpolation of Residual Terrain Model anomalies yields the highest quality gravity grid. In most cases, the Bouguer reduction and other interpolation methods tested are equally viable. However, spline-based interpolation should be avoided in marine areas with trackwise survey data. 相似文献
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Rene Forsbergbi Arne Vestergaard Olesen Adel Alshamsi Arne Gidskehaug Sahrum Ses Majid Kadir 《Marine Geodesy》2013,36(3):221-232
The Military Survey Department (MSD) of the United Arab Emirates (UAE) undertook an airborne gravity survey project for the marine area of the country in 2009, especially to strengthen the marine and coastal geoid in the near-shore regions. For the airborne gravity survey, 5 km spacing coast-parallel flight lines were planned and surveyed. These lines were supplemented by cross-lines in order to assess the quality of the airborne gravity surveys. The flight lines were extended 10 km, spacing lines further offshore. A Beech King Air 350 aircraft was used for the surveys, collecting data at a typical flight speed of 170 knots and a typical flight elevation of 900–1500 m, depending on weather conditions and topography. Gravity was measured with a ZLS-modified LaCoste and Romberg gravimeter (S-99), augmented with a Honeywell strap-down inertial navigation system unit. The estimated accuracy for the airborne gravity data is better than 2.0 mGal r.m.s., as judged from the airborne track crossovers. The new airborne gravimetry data changed the UAE coastal geoid by up to 30 cm in some regions, highlighting the importance of airborne gravity coastal surveys. 相似文献
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ABSTRACTDifferent types of gravity observations are available over coastal areas. The main challenge for coastal geoid determination is the proper fusion of heterogeneous gravity data including land, shipborne, airborne, and altimetry-derived gravity data. This paper describes the gravity data fusion and the computation of the gravimetric quasigeoid in the coastal area of mainland China. An iterative procedure of the weighted least-squares prediction based on rectangular harmonic functions is used for merging the land, altimetric, shipborne, and airborne gravity data. Applying the analytical continuation method in Molodensky's theoretic frame, the merged gravity data are then used to determine the gravimetric quasigeoid model by using the generalized Stokes' integral in a remove-compute-restore fashion. The gravimetric quasigeoid model is compared with the height anomalies determined at 662 GPS leveling points over the coastal region of mainland China, where both the geodetic height and the normal height are known. The standard deviations of the differences in the coastal provinces range from 1.8 to 4.4 cm. For the entire computation area, the mean and standard deviation of the differences are 27.9 and 3.9 cm, respectively. 相似文献
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分析评述了作者所在研究团队在海空重力测量技术体系建设领域取得的一些有理论意义和实用价值的研究成果,主要从各项关键技术的研究背景、研究思路、难点突破、成果应用前景等几个方面进行了分析和总结,回答了该研究领域涉及理论方法和工程应用的一系列科学问题。其目的之一是向读者成体系地推荐我们多年积累的研究成果,目的之二是想借此机会通过回顾和梳理研究团队的发展轨迹和科学感悟,在新的起点上定位未来的发展方向、发展目标和发展思路。分三个部分进行介绍,本文为第三部分,主要涉及海空重力测量数值模型构建与数据综合应用两个领域的研究成果。 相似文献