共查询到19条相似文献,搜索用时 110 毫秒
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通过应用WILD GAK-1陀螺经纬仪进行逆转点法、中天法及时差法的定向实验,论述了3种定向方法的理论精度,并和实际定向精度进行了比较。 相似文献
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时差法是一种较新的陀螺经纬仪定向方法。本文对这种定向方法的理论根据作了论证,对数据处理、定向精度以及提高精度的措施进行了讨论。在不同时间和地方用三种陀螺经纬仪(DJ_6—T_(60)、GAK-1、TDJ-Ⅱ)进行实验,通过对逆转点法、中天法、时差法实验成果的分析比较,肯定了时差法的优点并得出了一些有益的结论。 相似文献
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时差法是一种较新的陀螺经纬仪定向方法[1]。本文对这种定向方法的理论根据作了论证,对数据处理、定向精度以及提高精度的措施进行了讨论。在不同时间和地方用三种陀螺经纬仪(DJ_6-T_(60)、GAK-1、TDJ-Ⅱ)进行试验。通过对逆转点法、中天法和时差法实验成果的分析比较,肯定了时差法的优点并得出了一些有益的结论。 相似文献
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用陀螺经纬仪定向,采用跟踪逆转点法测定真北方向,其舒勒平均值相对于稳定平均值将产生漂移,这种漂移对所测定的子午线方向值带来误差影响。本文对几种陀螺经纬仪的跟踪观测实验数据进行分析,找出了每台仪器均 相似文献
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陀螺经纬仪逆转点观测数据随机模型的研究 总被引:2,自引:0,他引:2
逆转点观测方法是陀螺经纬仪传统观测方法之一,并已被应用到高精度自动观测陀螺经纬仪中。运用动态数据处理方法,对逆转点观测数据进行分析,得出二阶自回归(AR)模型能够较好地描述逆转点观测数据中的随机干扰误差的影响,为自动观测陀螺经纬仪数据处理提供了理论依据。 相似文献
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通过对中纬度地区子午线收敛角的计算,分析陀螺经纬仪定向中施加子午线收敛角的方法对定向精度的影响,消除了过去对施加子午线收敛角的模糊认识。并通过实例说明陀螺经纬仪定向中施加子午线收敛角的正确方法,其对高精度陀螺经纬仪的定向尤为重要。 相似文献
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提高陀螺经纬仪定向效率的方法 总被引:6,自引:0,他引:6
采用室内经常检测仪器常数,使用AGT-1高精度自动陀螺经纬仪,将GAK-1等仪器改造成高精度自动陀螺经纬仪以及修订定向测量规程等方法,可以大大提高定向效率和经济效益。 相似文献
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将国产全自动陀螺经纬仪AGT-1应用于地铁施工中,对长隧道中的控制边进行定向检核,得出了该陀螺仪在室外实际定向的精度,并对该仪器的使用提出几点建议。 相似文献
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结合距离-多普勒模型,推导了SAR(synthetic aperture radar)影像定向中像点坐标粗差对误差方程的影响,分析了像点坐标粗差探测的必要性和难点;依据粗差的拟准检定法,针对SAR影像定向中的像点坐标粗差检定问题,设计了具体的解算流程和策略,首次将粗差的拟准检定法运用到机载SAR影像定向中。并分别利用模拟和实测数据进行了系统性的实验,结果表明,该方法不仅能够准确探测出多个粗差的位置,而且能够估计出粗差的大小。与SAR影像定向通常采用的最小二乘方法相比,该方法能够明显提高SAR影像定向参数的解算精度以及后续的立体定位精度,对于修复受粗差影响的SAR影像数据具有重要意义。 相似文献
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为了提升面阵相机成像定位精度,以吉林省松原市北部区域的机载面阵图像为实验对象,对成像过程进行误差分析与标定. 机载面阵相机成像存在由三个姿态角引起的定位误差以及由相机镜头畸变等因素产生的畸变误差. 针对以上问题,首先采用严密几何模型,得到面阵图像初步成像结果;然后,采用后方交会和多项式附加参数模型等方法解决内、外方位元素引起的误差问题,得到较为精确的定位结果;最后进行实验验证,测试结果表明,经过内、外方位元素的误差定标,能够控制在5 m以内的范围,精度提升94.37%,处理效果显著. 通过研究标定面阵成像过程中内、外方位元素产生的误差,提高了面阵相机定位精度,对面阵相机成像的应用和推广具有一定价值和科学参考依据. 相似文献
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在2003年10月27日和28日观测的太湖水质光谱试验数据的支持下,利用数值模拟方法研究了试验数据误差与水质浓度反演模型经验常数之间的关系。研究结果表明,当试验数据误差分别服从正态分布与均匀分布时,反演模型的经验常数随着试验数据误差的增加而呈发散状态。根据试验数据误差与反演精度的关系可知,26.58%的试验误差对应着30%的反演精度,这就意味着在不考虑遥感影像处理所产生误差的前提下,严格控制试验数据误差在26.58%以内,是反演精度打破±30%的技术瓶颈的关键要素之一。 相似文献
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Adam P. Freedman 《Journal of Geodesy》1991,65(1):53-65
Summary A globally distributed network of high-precision receivers which obtain data from the full Global Positioning System (GPS) configuration of 18 or more satellites may soon become an efficient and economical method for the rapid determination of short-term variations in Earth orientation. A covariance analysis has been performed to evaluate the errors associated with GPS monitoring of Earth orientation. Earth orientation parameters were modeled either as constants over observing windows of various lengths, or as stochastic process-noise variables. The sensitivity of Earth orientation estimates to systematic errors in selected model parameters was also examined. GPS measurements appear to be highly competitive with those from other techniques, and have the potential to generate nearly continuous centimeter-level Earth orientation information to aid both spacecraft navigation and the study of high-frequency Earth orientation-related processes. 相似文献
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Ayman F. Habib Ana Paula Kersting Ki-In Bang Ruifang Zhai Mohannad Al-Durgham 《The Photogrammetric Record》2009,24(126):171-195
Lidar (laser scanning) technology has been proven as a prominent technique for the acquisition of high-density and accurate topographic information. Because of systematic errors in the lidar measurements (drifts in the position and orientation information and biases in the mirror angles and ranges) and/or in the parameters relating the system components (mounting parameters), adjacent lidar strips may exhibit discrepancies. Although position and orientation drifts can have a more significant impact, these errors and their impact do not come as a surprise if the quality of the GPS/INS integration process is carefully examined. Therefore, the mounting errors are singled out in this work. The ideal solution for improving the compatibility of neighbouring strips in the presence of errors in the mounting parameters is the implementation of a rigorous calibration procedure. However, such a calibration requires the original observations, which may not be usually available. In this paper, a strip adjustment procedure to improve the compatibility between parallel lidar strips with moderate flight dynamics (for example, acquired by a fixed-wing aircraft) over an area with moderately varying elevation is proposed. The proposed method is similar to the photogrammetric block adjustment of independent models. Instead of point features, planar patches and linear features, which are represented by sets of non-conjugate points, are used for the strip adjustment. The feasibility and the performance of the proposed procedure together with its impact on subsequent activities are illustrated using experimental results from real data. 相似文献
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H. S. Williams 《Journal of Geodesy》1969,43(4):381-402
Formulae for the reduction of gyro-theodolite observations using the reversal point method are reviewed and relative precisions
are compared. The significance of theoretical and practical comparison models is discussed and the flexibility and stability
of different reduction proposals are considered. More stable formulae than are currently available are derived for five, seven
and nine observations for moderate damping. The optimum number of observations to be taken for any spin-up of the gyroscope
is also examined. 相似文献