基于射频地图动态校正的井下定位技术研究

发布时间：2018-04-12 15:40

  本文选题：井下定位 + 射频地图　； 参考：《南京信息工程大学》2016年硕士论文

【摘要】：当前的煤矿安全生产要求对井下人员的位置进行精确的监控,井下定位技术已成为近年来国内外研究的热点。针对井下环境的特征本文研究了基于RSS (Received Signal Strength)的定位技术,在工程上和理论上重点研究了两大问题。在工程方面论证了井下定位网络构建的可行性并且设计了基于WLAN网络的井下定位网络系统,研究了采用2.4G射频信号和ZigBee网络实现定位的技术优势和实现可行性,设计了井下定位系统中的盲节点发射器的电路和控制软件,并且对发射器进行了测试。在算法理论上提出一种基于Radio Map动态校正的井下定位算法RM-DA-UL (Radio Map Dynamic Calibration Based Underground Location),在初始阶段利用贝叶斯回归算法对RSS观测值进行预测,采用预测值而非实测值建立Radio Map,有效的消除了噪声、多径等干扰对定位的影响,在Radio Map在线动态校正阶段,采用标准差的形式为用户提供定位误差的准确信息服务,在定位阶段利用权重NN算法,对大多数最近Radio Map定位点赋予最高权重,从而算出权重平均值,优选合适的AP锚节点完成盲节点定位。实验结果表明,设计的盲节点发射器可以满足井下定位的要求,定位系统的定位精度达到了研究任务的要求,同时与现有较为优秀的算法相比,本系统在定位精度、定位失效率,可定位目标数和系统抗干扰能力方面有明显的优势。
[Abstract]:The current coal mine safety production requires accurate monitoring of the location of underground personnel, and the downhole positioning technology has become a hot spot at home and abroad in recent years.According to the characteristics of downhole environment, this paper studies the localization technology based on RSS received Signal Strength, focusing on two major problems in engineering and theory.In engineering, the feasibility of constructing downhole positioning network is demonstrated, and the downhole positioning network system based on WLAN network is designed. The technical advantages and feasibility of using 2.4G radio frequency signal and ZigBee network to realize positioning are studied.The circuit and control software of blind node transmitter in downhole positioning system are designed, and the transmitter is tested.Based on Radio Map dynamic correction, a downhole location algorithm, RM-DA-UL Radio Map Dynamic Calibration Based Underground location, is proposed in this paper. In the initial stage, Bayesian regression algorithm is used to predict RSS observations.Using the predicted value instead of the measured value to establish Radio Map. effectively eliminates the influence of noise and multipath interference on location. In the online dynamic correction stage of Radio Map, the standard deviation is used to provide users with accurate information service of location error.In the localization phase, the weight NN algorithm is used to assign the maximum weight to the most recent Radio Map positioning points, so as to calculate the average weight, and select the appropriate AP anchor nodes to complete the blind node location.The experimental results show that the designed blind node transmitter can meet the requirements of downhole positioning, and the positioning accuracy of the positioning system meets the requirements of the research task. At the same time, compared with the existing better algorithms, the positioning accuracy of the system is improved.The failure rate, the number of targets and the anti-jamming ability of the system have obvious advantages.
【学位授予单位】：南京信息工程大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD76
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本文编号：1740358