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1.
为了进一步提高移动台的跟踪和定位性能,提出了一种基于联邦滤波结构和简化UKF的移动位置最优估计与融合新方法.该算法以Singer移动台运动模型作为参考系统,以简化UKF滤波器作为子滤波器,对2组独立检测的TDOA和Doppler测量值进行局部估计;然后在主滤波器中,对子滤波器的估计结果按标量加权进行最优融合,得到全局最优或次最优融合估计结果;最后主滤波器利用全局估计结果对子滤波器和参考系统进行反馈和信息重置,以进行下一步估计.仿真试验中,对该算法用于移动台位置估计的效果和性能进行评估,并与基于TDOA和基于Doppler的简化UKF方法做比较.仿真结果表明,该算法能有效降低移动台位置估计的误差和方差,具有良好的均方根误差和均值误差CDF性能. 相似文献
2.
利用DS18B20数字温度传感器、MQ-2烟雾传感器探测环境参数,采用数据融合技术对多个传感器采集到的数据进行处理和识别,不仅弥补了采用单一传感器的不足,而且很大程度上降低系统判断结果的不确定性,提高了系统预警的准确性和可靠性。设计一种基于 GSM/GPRS网络的远程火灾报警器的系统构成、工作原理,并给出了系统的软、硬件设计和功能实现。实验结果表明：以 GSM模块为基础的远程火灾报警器,可以缩短火灾报警时间,有效发挥消防设施作用,迅速扑灭火灾,为火灾远程报警提供了一种实用的联网技术方案。 相似文献
3.
Localization of the sensor nodes is a key supporting technology in wireless sensor networks (WSNs). In this paper, a real-time
localization estimator of mobile node in WSNs based on extended Kalman filter (KF) is proposed. Mobile node movement model
is analyzed and online sequential iterative method is used to compute location result. The detailed steps of mobile sensor
node self-localization adopting extended Kalman filter (EKF) is designed. The simulation results show that the accuracy of
the localization estimator scheme designed is better than those of maximum likelihood estimation (MLE) and traditional KF
algorithm. 相似文献
4.
1Introduction Inrecentyears,multisensordatafusiontechniques havefoundwidespreadapplicationsinmanytracking andsurveillancesystemsaswellasinapplications wherereliabilityisofamainconcern[1].Multisensor datafusionisdefinedasaprocessofintegratingdata frommulti… 相似文献
5.
为了减少节点传输数据量和网络总能量的消耗,本文针对特定应用模型,提出了基于卡尔曼滤波的数据融合算法,并用MATLAB工具进行仿真实验,证明该融合方法提高数据精确度和可信度. 相似文献
6.
烧结矿碱度的测量是钢铁工业中的关键和难点,况且又容易受到烧结几乎每一个操作环节的影响。利用BP神经网络进行多传感器数据融合的烧结矿碱度的预报模型,可对现场实际数据进行仿真,该方法准确性高,泛化能力广,具有很强的实用性和推广价值。 相似文献
7.
A method of medical image segmentation based on support vector machine （SVM） for density estimation is presented. We used this estimator to construct a prior model of the image intensity and curvature profile of the structure from training images. When segmenting a novel image similar to the training images, the technique of narrow level set method is used. The higher dimensional surface evolution metric is defined by the prior model instead of by energy minimization function. This method offers several advantages. First, SVM for density estimation is consistent and its solution is sparse. Second, compared to the traditional level set methods, this method incorporates shape information on the object to be segmented into the segmentation process. Segmentation results are demonstrated on synthetic images, MR images and ultrasonic images. 相似文献
8.
开发研制了由PC机、混凝土早期塑性收缩数据采集系统、激光位移传感器、移动存储设备等组成的完全非接触式混凝土早期塑性收缩仪。介绍了混凝土早期塑性收缩仪的基本组成、操作步骤、功能特点及基于三角反射法的测试原理。试验结果表明,该仪器可以对混凝土或砂浆的早期塑性收缩变形实现全过程测量,具有方便、可靠、连续、精确的特点。 相似文献
9.
集成了传感器、微机电系统和网络三大技术而形成的无线传感器网络(W SN)是一种全新的信息获取和处理技术。基于自组织机制和网内处理的数据融合技术能克服能量损耗与带宽的限制,极大地改善了W SN的整体性能。无线传感器网络在军事、环境、健康、家庭和商业领域有着广阔的应用前景。 相似文献
10.
数据汇聚是降低传感器网络传输能耗的重要手段.分簇传感网数据汇聚通常包括簇内汇聚及传递汇聚结果到基站两个阶段,现有方案大多关注第二阶段数据汇聚结果传递到基站的效率.现提出一种基于位置信息的分簇传感网数据汇聚方案,通过利用位置信息选择代理点,仅与代理点有不同测量值的节点进行数据发送,有效减少了第一阶段中的数据传输.理论分析与模拟试验表明,方案簇内消息发送数优于相关方案,减少了通信开销,延长了网络生命期. 相似文献
11.
在分析边缘保持滤波器算法的基础上,应用多传感器数据融合技术,提出了一种新的图像平滑算法。该算法釆用线状掩模窗口和最优融合估计方法,有效地增强了边缘保持能力和去噪能力,克服了边缘保持滤波器存在的缺陷。实验结果表明,该算法性能优于边缘保持滤波器及经典均值滤波器。 相似文献
12.
对于水下目标的波达方向估计(DOA)问题,提出一种基于压缩感知的估计方法。压缩感知(CS)是近年来出现的一种新的数据获取方法,能以低于Nyquist的采样率对稀疏数据或可压缩数据进行采样并以高概率对采样数据恢复重构。以水下目标的方位信号为估计对象,采用CS的正交匹配跟踪(OMP)技术估计稀疏信号中能量较强的位置,从而实现对目标的定向。为了验证基于CS技术的DOA估计方法的性能,将其与传统的MUSIC算法进行了对比,仿真验证的结果表明,新方法在估计角分辨率和有效性方面均优于MUSIC算法。 相似文献
13.
Some two-microphone noise reduction techniques that work in the frequency domain exploit coherence function between two noisy signals. They have shown good results when noise signals on two sensors are uncorrelated, but their performance decreases with correlated noises. Coherence based methods can be improved when the cross power spectral density （CPSD） of correlated noise signals is available. In this paper, we propose a new method for estimation of the CPSD of the noise, which is based on the minimum tracking technique. Despite the fact that the proposed estimator does not need to implement a voice activity detector （VAD）, its performance is comparable to a CPSD estimator that uses an ideal VAD. 相似文献
14.
李云飞 《内江师范学院学报》2012,27(6):15-17
针对不完全样本观测数据,讨论了一类均匀分布总体参数的区间估计问题．利用样本中位数给出了构造置信区间的一个新枢轴量,推导出了枢轴量的概率密度函数表达式,并且在大样本场合,讨论了总体参数的近似置信区间．该方法不仅适用于不完全数据场合,而且还适用于样本中可能存在异常数据的情形,具有稳健性． 相似文献
15.
A leak detection method based on Bayesian theory and Fisher’s law was developed for water distribution systems. A hydraulic model was associated with the parameters of leaks (location, extent). The randomness of parameter values was quantified by probability density function and updated by Bayesian theory. Values of the parameters were estimated based on Fisher’s law. The amount of leaks was estimated by back propagation neural network. Based on flow characteristics in water distribution systems, the location of leaks can be estimated. The effectiveness of the proposed method was illustrated by simulated leak data of node pressure head and flow rate of pipelines in a test pipe network, and the leaks were spotted accurately and renovated on time. 相似文献
16.
大理白族服饰的图案丰富多彩。它既有防止衣物磨损的实用功能,也有表现造型美、构图美和色彩美的审美功能,还有求子祈喜、生命永生、消灾祈福的意象功能。其实用功能是一种原始功能,审美功能在实用功能的基础上得以体现,意象功能则进一步体现出白族社会的文化内涵。 相似文献
17.
INTRODUCTION Saccharomycete, closely linked with human life, is the only microbe that has been utilized to the extent of over a million tons in the world, and is one of the modelled biological bacteria mostly used in modern genetic engineering. Since there are no effective online instruments for measuring the production or resultant concentration, which is a very important quality index in fermentation process, soft sensors (Martin, 1997; Tham et al., 1991; Assis and Filho, 2000; Salgad… 相似文献
18.
基于数据挖掘的医学图像分类方法研究是多媒体数据挖掘的一个重要组成部分。在分析和总结了现有各种特征提取方法的基础上，提出了基于核密度估计聚类和关联规则的医学图像分类算法和关联规则的医学图像分类器框架。该算法先用核密度估计的聚类算法实现医学图像的聚类，在聚类的结果上提取局部特征，在局部特征上用关联规则实现医学图像的分类。实验结果表明可以较好的提高医学图像分类的准确率。 相似文献
19.
INTRODUCTION Pose and structural parameters analysis of 2Dimages sets find application in many areas such asobject recognition, motion estimation, navigationplanning, and structural analysis of 3D objects(Huang and Netravali, 1994), image communica-tion, and image coding (Mitiche and Aggarwal,1986). Normally, given one set of 3D object pointdata and their corresponding 2D projective imagepoint data, the 3D-2D calibration problem is re-ferred to as the estimation of the camera par… 相似文献
20.
Pose and structure estimation from a single image is a fundamental problem in machine vision and multiple sensor fusion and integration.In this paper we propose using rigid constraints described in different coordinate frames to iteratively estimate structural and camera pose parameters.Using geometric properties of reflected correspondences we put forward a new concept,the reflected pole of a rigid transformation.The reflected pole represents a general analysis of transformations that can be applied to both 2D and 3D transformations.We demonstrate how the concept is applied to calibration by proposing an iterative method to estimate the structural parameters of objects.The method is based on a coarse-to-fine strategy in which initial estimation is obtained through a classical linear algorithm which is then refined by iteration.For a comparative study of performance,we also implemented an extended motion estimation algorithm(from 2D-2D to 3D-2D case)based on epipolar geometry. 相似文献