共查询到17条相似文献,搜索用时 140 毫秒
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动态重力仪和惯性导航系统的核心元件都是惯性元件,即陀螺仪和加速度计(重力传感器可以认为是一种特殊的加速度计),因此重力测量与惯性导航具有紧密的联系。从比力测量、物理与数学平台、惯性手段辅助重力测量,以及重力辅助惯性导航等方面分析了重力仪与惯性导航系统的紧密联系。并对惯性导航与重力测量的融合应用进行了分析。 相似文献
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重力梯度张量是重力位二阶导,相比重力异常能够更好反映局部区域的细节特征。因此重力梯度导航理论上能为惯性导航提供更好的辅助。重力梯度导航的关键技术之一是背景基准图的构建,推导了扰动重力梯度张量与扰动位在局部指北坐标系中的关系式,并基于EGM2008地球重力场模型构建了一块范围的海域扰动重力梯度张量基准图。为了快速构建基准图,选取了合适的勒让德函数,并将每一个梯度张量的计算式改变求和顺序来提高同一纬度圈上的计算点的计算速度。最后利用梯度张量对角线上三元素满足拉普拉斯约束条件的原理验证了所得基准图的正确性。 相似文献
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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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重力测量系统中测量的重力,即重力加速度,是一种特殊的加速度,因而重力传感器是一种特殊的加速度计。在动态场合,现代重力仪一般采用基于陀螺仪构建的各种平台为重力传感器提供姿态基准。因此采用加速度计和陀螺仪这些惯性元件的动态重力测量系统可以看做是惯性技术的一种具体应用。从惯性技术的角度对动态重力测量的理论和现状进行了分析。首先介绍了在地球表面附近进行重力测量时涉及的参考坐标系。然后详细推导了动态重力测量的基本理论,即比力测量理论,指出比力方程是动态重力测量和惯性导航的共同基础。最后对不同载体对动态重力测量系统的影响与要求进行了分析。 相似文献
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王大鸿 《中国海洋大学学报(自然科学版)》1987,(2)
用微扰动方法对旋转地球上不可压缩流体的控制方程组进行线性化,得到了扰动解和流体界面上惯性重力波的频率方程。表面惯性重力波和惯性重力内波的相速公式都是这个更普遍的频率方程的特殊情况。 相似文献
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重力辅助惯性导航的匹配算法初探 总被引:1,自引:0,他引:1
对重力辅助惯性导航技术的基本原理进行了分析,将采样卡尔曼滤波算法用于重力图形匹配。滤波通过设计少量的Σ点,并计算这些Σ点的经由非线性函数的传播,从而获得滤波值基于非线性状态方程的更新,较广义卡尔曼滤波具有计算精度高、便于计算的特点。 相似文献
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The analysis of the dynamic behavior of floating units usually employs a coordinate system with origin in the unit's center of gravity, which significantly simplifies the global mass matrix. Hydrodynamic coefficients are then computed considering the same coordinate system. However, to analyze other conditions of mass distribution and maintain the simplicity of a global mass matrix, it is necessary to determine again the hydrodynamic coefficients, thereby reducing the efficiency of the entire process. Another important point is that the geometries frequently used in floating units are such that the cross-terms of an added mass are relatively unimportant when compared with the main terms, and it is, therefore, common to use only some of them to analyze the unit's dynamic behavior. Recently, however, in the search for production systems suitable for water depths greater than 3000 m, other geometries have been considered in technical and economic feasibility studies. It is possible that for these new geometries all terms of the added mass matrix must be included in the analysis. This paper presents the full development used to determine the complete global mass matrix, the inertial and hydrodynamic inertial loads that make use of the added mass matrices considering any coordinate system and the six degrees of freedom, including all cross-terms. 相似文献
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Izvestiya, Atmospheric and Oceanic Physics - The movement of inertial particles in intense vortices with a vertical axis in a gravity field is analyzed analytically. In this problem, the nonlinear... 相似文献
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This paper presents a general solution of shallow-water equations on the f-plane. The solution describes the generation of inertial oscillations by wind-pulse forcing over the background of currents arbitrarily changing in time and space in a homogeneous fluid. It is shown that the existence of such a complete solution of shallow-water equations on the f-plane is related to their invariance with respect to the generalized Galilean transformations. Examples of velocity hodographs of inertial oscillations developing over the background of a narrow jet are presented which explain the diversity in their forms. 相似文献