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基于距离差信息的多基地雷达的布局和定位精度分析 总被引:5,自引:0,他引:5
本文首先给出了基于距离差定位的误差概率分布;然后根据误差协方差矩阵和两种常用的定位精度度量准则关系,利用最小误差椭球准则,给出了在对称地面上对空中目标进行定位的最优布局方法;最后给出了一些计算结果。 相似文献
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基于平均跳距修正的无线传感器网络节点迭代定位算法 总被引:7,自引:0,他引:7
针对无需测距DV-Hop定位算法存在较大定位误差的问题,从3个方面对其进行了改进:采用最小二乘法准则校正了信标节点间的平均每跳距离;基于对多信标节点平均每跳距离的加权处理修正了用于位置估计的平均每跳距离;通过设定定位精度门限,给出了对估计的定位节点坐标进行迭代求精的数值方法.给出了改进定位算法的实现流程,并对算法的性能进行了仿真研究.仿真结果表明,在适当增加节点计算量和通信开销的条件下,改进算法的定位精度和精度稳定性有明显改善,是一种可行的无线传感器网络节点定位的解决方案. 相似文献
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为了确定三视场定位定向设备各个误差源对定位定向误差的影响,建立了定位定向的误差分析模型。首先,给出了三视场导航设备采用空间解析几何法进行定位定向的原理。其次,指出影响定位定向的各个误差源,归纳分析了误差源的特性、概率分布以及误差源对定位定向信息对的影响。然后,利用定位定向原理建立起定位定向误差分析模型。最后,利用蒙特卡罗法进行误差仿真分析。仿真结果表明系统的定位均值误差为121.0 m;定向均值误差为7.4,并指出定位定向主要的误差源是水平测量误差,其次是垂线偏差数据的误差。野外实验表明,该系统的定位均值误差为182.12 m;定向均值误差为9.3,水平测倾角的误差对定位定向结果的影响最大。 相似文献
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本文对距离交会、角度交会、干涉仪等测轨定位体制进行了综合论述,对它们的测量精度进行了分析,推导出了位置参量与定位误差的关系,并按照“最小误差体积准则”和“GDOP最小准则”进行了分析比较,比较结果说明,距离交会的测轨定位体制精度较高。 相似文献
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本文对距离交会、角度交会、干涉仪等测轨定位体制进行了综合论述,对它们的测量精度进行了分析,推导出了位置参量与定位误差的关系,并按照“最小误差积准则”和“GDOP最小准则”进行了分析比较,比较结果说明,距离交会的测轨定位体制精度较高。 相似文献
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一种新型平面并联定位机构的误差建模与分析 总被引:2,自引:0,他引:2
当前IC行业的迅速发展使得研制新型高速精密定位机构成为十分迫切的任务.针对这种需要,提出了一种新型平面并联定位机构,它由直线电机直接驱动含有平行四边形支链的并联杆机构来实现末端平台平面内的平动.首先根据输入、输出关系微分法建立了机构的误差模型,并对影响末端位姿误差的各类几何误差源进行了敏感性分析,给出了误差源对末端精度的敏感系数;然后基于误差映射矩阵,推导了机构定位误差极值表达式,并给出了已知误差源精度水平下,平台定位误差在工作空间内的分布情况.上述误差建模与分析方法对高精度的定位机构的设计及误差补偿具有重要的指导意义. 相似文献
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本文系统地分析了基于到达时间差信息定位的多传感器的布局方法,首先给出了定位误差的概率分布,然后根据其误差协方差矩阵与定位误差椭球体积的关系,给出了对椭圆域内圆心上方目标进行定位的最优布局方案,并以此巧妙地导出了圆形平面布站域内对空中任 位置点目标定位的最优布局。 相似文献
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为了满足三站时差(Time Difference of Arrival,TDOA)定位系统对定位精度的要求,论述了三站时差定位原理。用几何稀释精度(Geometric Dilution of Precision,GDOP)分析定位精度并做了仿真。对仿真结果进行分析,讨论站址测量误差和时差定位误差对定位精度的影响,提出要满足时差定位精度要求所需要达到的站址测量误差和时差测量误差指标,以及在工程实现中提高时差定位精度的方法。 相似文献
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针对高轨三星无源定位系统对空中恒定高度运动目标探测的应用场景,提出了一种利用信号到达时差( TDOA)、到达频率差( FDOA)的无源定位与测速方法。详细描述了算法原理、算法处理步骤,利用STK( Satellite Tool Kit)软件结合计算机仿真,分析了时差测量误差、频差测量误差、高程估计误差对定位精度与测速精度的影响。该方法定位精度与测速精度较高,具有一定的工程应用价值。 相似文献
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Seungil Myong Sanghyun Mo Hoesung Yang Jongsub Cha Heyungsub Lee Dongsun Seo 《ETRI Journal》2011,33(4):528-536
In this paper, we analyze the location accuracy of real‐time locating systems (RTLSs) in multipath environments in which the RTLSs comply with the ISO/IEC 24730‐2 international standard. To analyze the location error of RTLS in multipath environments, we consider a direct path and indirect path, in which time and phase are delayed, and also white Gaussian noise is added. The location error depends strongly on both the noise level and phase difference under a low signal‐to‐noise ratio (SNR) regime, but only on the noise level under a high SNR regime. The phase difference effect can be minimized by matching it to the time delay difference at a ratio of 180 degrees per 1 chip time delay (Tc). At a relatively high SNR of 10 dB, a location error of less than 3 m is expected at any phase and time delay value of an indirect signal. At a low SNR regime, the location error range increases to 8.1 m at a 0.5 Tc, and to 7.3 m at a 1.5 Tc. However, if the correlation energy is accumulated for an 8‐bit period, the location error can be reduced to 3.9 m and 2.5 m, respectively. 相似文献
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Bo-Chieh Liu Ken-Huang Lin 《Vehicular Technology, IEEE Transactions on》2008,57(1):227-238
A proposal for hyperbolic location analysis based on the difference between pairs of received signal strength, called the stationary signal-strength difference (SSSD), has been made. Its location accuracy, in general, is limited because of two impairment factors: One factor is a high level of SSSD measurement error resulting from the shadowing, multiple-access interference, and nonline-of-sight effects; another factor is an error resulting from the estimation of the reference distance between the mobile subscriber and the serving base transceiver station (BTS), called the estimation error. Because of both factors, a larger bias error in the corresponding distance difference is expected, particularly when the SSSD levels are measured using standard handheld devices. This paper studies first the effects of bias error and then proposes an error correction method to decrease the larger bias error initially met. The method is based on the least square algorithm, which is simple, has a low computation burden, and gives noniterative and explicit solutions. Using the calibration data that are collected in a commercial cellular 900 MHz network, we analyze the estimation and SSSD measurement errors and demonstrate the performance merits of the proposed correction method. Field trial results show that our method achieves significant improvement in bias error compensation and, consequently, in location error mitigation. Specifically, for urban and rural environments with a six-BTS case, the mean error of location estimation can be reduced by an average of approximately 27% and 29%, respectively, reaching the lowest (best) values of 205 and 271 m, respectively. 相似文献
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The problem of estimating the target location on the plane in the bistatic radar with large bistatic angles is considered. The formulas for the location errors and their statistical characteristics are given. At the same time it is adopted a normal distribution of azimuth error and of range error. The results are intended for design of forward scattering radars and similar systems. 相似文献