共查询到20条相似文献，搜索用时 95 毫秒
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通过运用附有条件的条件平差原理解算附有限制条件的间接平差模型,以及运用附有限制条件的间接平差原理解算附有条件的条件平差模型,推证得出结论:对于同一个平差问题而言,这两种平差模型是完全等价的,都可作为各种经典平差模型的概括平差模型。 相似文献
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顾及起始数据误差影响时单位权中误差的估值 总被引：1，自引：0，他引：1
黄加纳 《武汉大学学报(信息科学版)》1986,(4)
本文推导了在附有条件的间接平差和附有未知数的条件平差两种方法中,顾及起始数据误差影响时,计算单位权中误差估值(?)的公式,并以两个实例说明,平差时应该考虑起始数据误差对(?)的影响。 相似文献
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《测量评论》2013,45(70):351-356
AbstractThe method of checking reduction of normal equations which will be described below was first devised by the present writer when he had to adjust in one set the whole of the Southern Block of the Major Triangulation of Palestine, involving 114 equations of condition. This method. proved to be so useful and. efficient that, when subsequently adjusting the Northern Block of the same network (117 condition equations in simultaneous adjustment), the advisability of its application was obvious. Finally, in war time, the adjustment in one set of 65 condition equations of the Northern part of the Transjordan Primary Triangulation observed by the Army, equally underwent self-checking by the same method and proved a complete Success. 相似文献
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《测量评论》2013,45(61):264-267
AbstractIn adjusting a triangulation network it may happen that certain condition equations, of the existence of which we know a priori (by formulæ or by plotting the network point by point), cannot be established by simple inspection of the figure. This usually happens when some of the observations are missing in the otherwise continuous network. Such equations, not readily identifiable from the diagram, may be called “implicit” condition equations. 相似文献
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This paper presents a new strategy for GPS carrier phase data processing. The classic approach generally consists of three steps: a float solution, a search for integer ambiguities, and a fixed solution. The new approach is based on certain properties of ambiguity function method and ensures the condition of integer ambiguities without the necessity of the additional step of the integer search. The ambiguities are not computed explicitly, although the condition of “integerness” of the ambiguities is ensured in the results through the least squares adjustment with condition equations in the functional model. An appropriate function for the condition equations is proposed and presented. The presented methodology, modified ambiguity function approach, currently uses a cascade adjustment with successive linear combinations of L1 and L2 carrier phase observations to ensure a correct solution. This paper presents the new methodology and compares it to the three-stage classic approach which includes ambiguity search. A numerical example is provided for 25 km baseline surveyed with dual-frequency receivers. All tests were performed using an in-house developed GINPOS software and it has been shown that the positioning results from both approaches are equivalent. It has also been proved that the new approach is robust to adverse effects of cycle slips. In our opinion, the proposed approach may be successfully used for carrier phase GPS data processing in geodetic applications. 相似文献
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地图数字化的坐标转换及数据的精度与相关性 总被引：14，自引：2，他引：14
在分析地图数字化坐标数据的误差性质时，通常将经过坐标转换后的坐标值作为相互独立的数字化观测值，而将它们与相应的已知坐标之差值当作相互独立的随机误差进行分析，为了对数字化坐标数据及其误差进行更严贩分析，本文将来求转换参数的已知的地面坐标和数字化坐标都视为观测值，并用附有参数的条件平差法来求转换参数，再进一步对转换后的数字坐标的精度和基相关性进行讨论。 相似文献
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本文以地物特征点之间的几何条件建立条件方程,通过平差计算得到地物点测量的精度,由于不同于传统的地物点高精评定方法(对已测完的地物,再架设仪器测量特征点,用两次结果的差值评定地物点精度),故称为地物点测量精度的自评定法。其特点:一是通过平差计算可得到地物特征点测定中误差、地物面积的中误差和面积相对中误差;二是使基础地理数据有很好的几何上的一致性;三是绘图和精度同步,即当用平差后坐标绘图的同时,便知道其点位精度和面积精度。通过全站仪对直角楼房测量实验证明本文方法是可行的。 相似文献
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《测量评论》2013,45(34):228-236
Abstract1. The condition of least squares for survey adjustments is generally accepted as providing the best set of corrections, and the method might be more universally used were it possible to avoid the solution of as many simultaneous equations as there are independent unknowns. The method of correlatives effects a simplification where the number of conditions relating the unknowns is small, notably in Traverse Survey. 相似文献
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构像畸变模型参数对普通数码影像DLT算法精度影响 总被引：1，自引：0，他引：1
在不同的构像畸变模型条件下,利用附加条件的DLT算法处理普通数码影像所得到的影像精度是不同的。控制点分布均匀时,进行试验,结果表明,在较少控制点情况下,可考虑引入3个畸变系数k1、P1、P2来提高解算精度;而当控制点数达到一定数量时,可考虑引入3个畸变系数k1、p1、p2或5个畸变系数k1、k2、k3、p1、p2以提高解算精度。 相似文献
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A new gravity base net (“Schweregrundnetz 1976 der Bundesrepublik Deutschland”, DSGN 76) has been established in the Federal Republic of Germany, to meet the increased requirements of geophysics, geology, metrology and geodesy. The net comprises 21 stations with three excenters each. The gravity values were determined using 4 absolute stations, 11 IGSN71-stations and about 3000 relative gravity meter observations with 4 gravity meters. Instrumental investigations and special treatment of local tidal and atmospheric effects improved the data for the least squares adjustment, which was performed by the method of observation equations following the use of condition equations. The final adjustment showed a point r.m.s. error of about 10μGal[10?8 ms?2]. Detailed results will be published in the ”Veröffentlichungen der Deutschen Geodätischen Kommission”. 相似文献
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随着电子战、信息战在现代军事领域的地位日趋重要,基于外辐射源的定位跟踪方法成为现代雷达领域的研究热点。针对通过单站接收多外辐射源信号获取角度（direction of arrival,DOA）和时差（time difference of arrival,TDOA）信息对运动目标跟踪的问题,首先推导角度和时差的伪线性观测方程,在通过最小二乘（least squares,LS）算法获取初值的条件下,利用传统的卡尔曼滤波算法实现目标的跟踪,该方法称为伪线性卡尔曼滤波（pseudo-liner Kalman filter,PKF）算法。进一步分析观测方程,提出了利用迭代的IPKF（iterative PKF）目标跟踪算法,并推导其克拉美罗下界（Cramer-Rao lower bound,CRLB）。仿真实验分析说明,该IPKF算法的跟踪精度、收敛速度和稳定性均优于传统的扩展卡尔曼滤波（extended Kalman filter,EKF）算法,且迭代次数越多,性能越好,观测误差越小,跟踪误差越接近CRLB。 相似文献