共查询到18条相似文献，搜索用时 203 毫秒
1.
针对近景摄影测量中影像与地面坐标系间存在大旋转角的问题,在分析现有绝对定向算法的基础上,提出了一种适合大旋转角影像的绝对定向方法,采用奇异矩阵分解获取较准确的角元素初值,并结合最小二乘平差进行粗差剔除和绝对定向精确参数解算。试验表明,本算法计算简单、收敛速度快,具有很好的实用价值。 相似文献
2.
绝对定向在摄影测量学中具有重要的作用,惯用的迭代解法需要比较准确的迭代初值.在简要介绍对偶四元数的基础上,利用对偶四元数描述坐标系之问的旋转与平移,通过严格的数学推导得到了一种利用对偶四元数进行绝对定向的新算法.该算法将绝对定向问题转化为最优化问题进行求解,无需迭代,直接求解.实验结果表明:同惯用迭代解法进行比较,无需设置计算的初始参数,计算速度快,求解正确,且具有很好的适应性和稳定性. 相似文献
3.
4.
基于单位四元数的绝对定向直接解法 总被引：1，自引：0，他引：1
摄影测量学中传统的绝对定向一般是迭代算法,需要比较准确的迭代初值.在简要介绍四元数的基础上,通过严格的理论推导得到了一套无需迭代、直接求解绝对定向参数的算法.算法的主要原理是用单位四元数描述坐标旋转变换关系,并将绝对定向问题转变为一个最优化问题进行求解.最后通过模拟数据进行仿真计算试验,验证了算法的正确性和可靠性. 相似文献
5.
6.
7.
8.
9.
10.
11.
拟调和性及重调和性重力场源的正交分解 总被引：1，自引：0，他引：1
文章针对物理大地测量学反问题研究中的拟调和性重力场源及重调和性重力场源,将该研究中的理论核心－正交分解定理予以具体实现。使得这一定理实际应用于场源结构的解释与分析成为。同时,给出并证明几个具有重要实用意义的关于零外部位密度、拟调和性及重调和性场源性质的基本公式。最后对具体实现场源正交分解的实际步骤、正交分解定理的实质、以及物理大地测量学反问题研究中关于场源涵数的主要限制的意义予以评述。 相似文献
12.
本文详细讨论了矩阵和的Moore—Penrose逆计算问题,在已有的矩阵Moore—Penrose逆理论和成果的基础上,得到了一系列新的计算公式,并且给出了许多简化条件。从而,改善和推广了国内外有关文献中的结果。 相似文献
13.
14.
HE Xiufeng CHEN Yongqi HU Shousong 《地球空间信息科学学报》2000,3(1):62-65
1 IntroductionThe inverse problem of oPtirnal regulators is tofind a suitable quadratic ast function fOr a lineartime-invariable system with constant but unknowndisturbance so that the optimal control law canmeet the requirements of relative stability. Inl984,Juang and Lee presented a methed of OPtitnalPOle assignrnent in a sPecified region. In l986, Leeand Liaw presented a new methed for finding theweighting matrices Q and R of inverse regulatorswithout soution of the Ricatti equation. … 相似文献
15.
The differencing technique is useful in global positioning system (GPS) positioning when two or more GPS receivers collect simultaneous observables from common satellites at each epoch, and all carrier-phase observables have the same normal distribution. An analytical probability distribution of the single-, double-, triple- and multi-difference GPS observables is obtained. This analytical model, called ISO2002, has a good matrix structure, in which I indicates the number of receivers, S indicates the number of observed satellites, and O indicates the number of epochs. The variance–covariance matrix can be expressed as the Kronecker product of several small matrices, so its inverse is equal to the Kronecker product of the inverses of these sub-matrices. Moreover, these small matrices are circulant or symmetric diagonal Toeplitz matrices, so their inverses have analytical solutions. The analytical model ISO2002 proposed to compute the inverse variance–covariance matrix is shown to be very effective. 相似文献
16.
基于岭估计的SPOT影像外方位元素的解算方法 总被引：3，自引：0，他引：3
后方交会法解求 SPOT卫星影像的外方位元素时 ,其法方程系数矩阵经常产生很严重的病态 ,若用最小二乘法估计 ,参数解将明显偏离真值 ,甚至无法解得外方位元素。本文中提出了用最小二乘岭估计的方法解求外方位元素 ,实验证明这是非常有效的。 相似文献
17.
A recursive least squares algorithm is presented for short baseline GPS positioning using both carrier phase and code measurements. We take advantage of the structure of the problem to make the algorithm computationally efficient and use orthogonal transformations to ensure that the algorithm is numerically reliable. Details are given for computing position estimates and error covariance matrices with possible satellite rising and setting. Real data test results suggest our algorithm is effective.This research was supported by NSERC of Canada Grant RGPIN217191–99, FCAR of Quebec Grant 2001-NC-66487, and NSERCGEOIDE Network Project ENV#14 for Xiao-Wen Chang, and by NSERC of Canada Grant RGPIN9236–01 for Christopher C. Paige.An erratum to this article can be found at 相似文献
18.
A recursive least squares algorithm is presented for short baseline GPS positioning using both carrier phase and code measurements. We take advantage of the structure of the problem to make the algorithm computationally efficient and use orthogonal transformations to ensure that the algorithm is numerically reliable. Details are given for computing position estimates and error covariance matrices with possible satellite rising and setting. Real data test results suggest our algorithm is effective.This research was supported by NSERC of Canada Grant RGPIN217191–99, FCAR of Quebec Grant 2001-NC-66487, and NSERCGEOIDE Network Project ENV#14 for Xiao-Wen Chang, and by NSERC of Canada Grant RGPIN9236–01 for Christopher C. Paige.The online version of the original article can be found at 相似文献