共查询到19条相似文献,搜索用时 390 毫秒
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为了提高多系统组合单点定位的运算效率,将Bancroft算法推广应用于GPS/BDS/GLONASS三系统伪距单点定位,并推导了该方法的详细计算流程,比较了Bancroft算法、最小二乘算法和组合两种算法的精度、迭代次数以及运算时间。利用实测数据进行实验,结果表明,3种算法精度相当,Bancroft算法比最小二乘算法迭代次数少,运算效率提高了38%,利用Bancroft为最小二乘算法提供初值,收敛速度加快,运算效率提高了36%。最终得出结论,Bancroft算法应用于GPS/BDS/GLONASS三系统伪距单点定位满足精度要求,且Bancroft算法对于减少迭代次数,提高运算效率有重要意义。 相似文献
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针对全球卫星导航系统(global navigation satellite system, GNSS)的中长基线快速动态定位,提出了一种基于三频组合观测值的实时动态差分(real-time kinematic, RTK)卡尔曼滤波定位方法,以位置参数和宽巷组合观测值的双差模糊度为状态向量进行参数估计,采用最小二乘模糊度降相关平差(LAMBDA)方法搜索固定模糊度,以改正后的超宽巷组合观测值为高精度“伪距”,以宽巷组合观测值作为载波相位进行定位解算。通过香港和河南省境内的两组中长基线实验数据,详细分析了该方法在中长距离下的快速动态定位解算性能。实验结果表明,采用该方法宽巷模糊度可实现单历元固定,在静态固定率达到约100%,动态情况下固定率也可以达到约65%,达到了快速高精度定位解算的要求,平面位置精度均能实时达到厘米级。 相似文献
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随着Li DAR的迅速发展,三维激光扫描技术已经被广泛运用于各个领域。点云数据配准过程中,传统的配准算法比较依赖特征点匹配精度,粗差点的存在会较大程度地影响配准精度和配准效率。通过对罗德里格矩阵、整体最小二乘原理的分析,提出了一种基于整体最小二乘的罗德里格矩阵算法。在该算法实现的过程中,能够考虑到系数矩阵误差,降低算法实现过程中特征点坐标误差对参数求解的影响。实验结果表明,本文算法比参数算法和严密的罗德里格算法精度更高、稳定性更强,在初始对应点坐标误差较大的情况下仍能获得精度较为稳定的变换参数。 相似文献
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《中国海洋大学学报(自然科学版)》2017,(Z1)
主要考虑求解等式约束不定最小二乘校正问题。基于不定对称矩阵的反三角矩阵分解,给出了求解不定最小二乘更新问题的一种数值方法。该算法主要通过正交相似变换将对应的增广矩阵化为块下反三角形式,使得原线性系统变得更易于求解,同时也给出了原问题和校正问题的解之间的关系。数值实验表明本文给出的数值方法是有效的,可以得到较精确的近似解。 相似文献
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分别采用非差无电离层组合模型与非差非组合模型进行批量静态定位解算,对比两者的定位精度以及ZPD估计精度。设计并实现两种模型的并行解算方法,提高非差模型的计算效率。大网数据实验结果表明,两种模型定位精度基本一致,非差非组合ENU的3个方向平均偏差为(4.2,2.8,6.6)mm,组合模型的平均偏差为(4.0,2.8,6.3)mm,但非差非组合模型的解算更加耗时,约是组合模型计算时间的1.4倍。多核环境下,两种模型的并行解算效率均比传统串行模型得到了提高。结果表明,双核并行和四核并行的计算效率比单核串行计算均分别提高了40%和60%以上。 相似文献
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The Indian Regional Navigation Satellite System (IRNSS) has recently (as of May 2016) become operational. The system has been developed with the objective of offering positioning, navigation, and timing (PNT) to users in its two service areas, covering the Indian landmass and the Indian Ocean, respectively. It is the goal of this contribution to provide further insight into the full-constellation L5 pseudorange single-point positioning (SPP) capabilities of the system. A detailed dilution of precision (DOP) analysis of its two service areas, including the identification, in location and time, of poor receiver-satellite geometries is provided. It is hereby demonstrated how the impact of some of these poor receiver-satellite geometries can be mitigated by means of height-constraining. An overview and analysis of the SPP precision is also provided including easy-to-use representative day-averaged values for a grid of locations covering the two service areas. 相似文献
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Comparing to single BeiDou Navigation Satellite System (BDS) Precise Point Positioning (PPP), a method which can more quicklydetermine the ambiguity parameters of BDS through applying the contribution of GPS observations is proposed and analyzed in this article. The numerical examples and analysis show that the ionosphere-free ambiguities of BDS satellites can be determined and converged more quickly because of the contribution of GPS observations. The average improvement of the convergent speed of positioning is 18.5% and its positioning accuracy in N, E, and U components are improved by 29.4, 30.3, and 34.4%, respectively, with the contribution of the a priori coordinates obtained from GPS observations. This method is useful for single BDS system positioning when there is a priori information provided by GPS or other sensors which be replaced by and can be applied at the beginning of the computation. 相似文献
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AbstractIn long baseline (LBL) positioning system, errors due to uncertain sound speed are the major facts to its positioning accuracy. In this study, the problem is solved by setting acoustic signal travels between the target and different hydrophones with different sound speed and using particle swarm optimization algorithm to solve the multi-parameter optimization problem to obtain the sound speeds. Presented simulation results show that the proposed algorithm can effectively improve the positioning accuracy of the LBL system compared to existing algorithms and its computational efficiency is high enough. 相似文献
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Hsin-Hung Chen 《Ocean Engineering》2008,35(14-15):1448-1462
Positioning accuracy of an ultra short baseline (USBL) tracking system is significantly reduced with the increase of alignment errors in the installation of sensors. Although techniques for sensor alignment calibration have been developed, they are either complex or lacking in rigor. This study proposes an algorithm to estimate the angular misalignments of a USBL transceiver relative to attitude sensors. The numerical algorithm is based on the positioning errors caused by heading, pitch, and roll misalignments, respectively, when running a circular survey around a seabed transponder. The positioning errors introduced by the angular misalignments outline an iterative scheme of estimating the roll alignment error first, next the heading alignment error, and then finally the pitch alignment error. This makes possible the efficient estimation of all angular misalignments with a high degree of accuracy. With the consideration of measurement error and executing a non-centered and non-perfect circle around the true transponder position, numerical simulations are performed to validate the effectiveness of the proposed algorithm. The simulation results show that the proposed algorithm is robust to the effects of measurement error, non-centered circles, and non-perfect circles. Moreover, the estimates converge fairly quickly, and can be achieved with good accuracy in only a few iterations. 相似文献
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随着海洋油气资源开发逐渐走向深海,浮式结构物的定位能力越来越受到人们的重视。锚的泊辅助动力定位系统是将锚泊定位和动力定位相结合的一种新型海上定位系统。它具有安全性高、定位能力强、消耗功率小的特点。本文以某深水半潜式钻井平台为例,通过建立锚泊辅助动力定位时域模拟程序,分析平台在工作海况下的定位精度和功率消耗,并与相应海况下的动力定位进行比较。分析结果表明,该时域模拟程序能较为准确的地反映实际平台的定位情况。与动力定位相比,锚泊辅助动力定位能够取得更好的定位精度和较小的功率消耗,是更理想的定位方式。 相似文献