基于卫星导航的震后被困人员手机信号定位分析

针对当前被困人员手机信号定位所采用的方法中手机信号定位距离存在局限性,且信号来源方向的确定受信号传播损耗变化影响较大的问题,提出基于卫星导航的震后被困人员手机信号定位分析方法。从地震的突发性、破坏性、社会影响和防御难度四个方面分析地震的特点,设计便携式移动台,通过GPS单差模型提取手机残差信号,计算各移动台在指定区域中的手机信号平均残差,获取各个区域手机信号的均方根,将均方差代入所有地震事件的双差方程进行联立,求解手机信号强度,通过AOA测量方法实现了卫星导航定位手机信号的分析。通过模拟在地震废墟中测试手机接收信号强度指示值(RSSI)与手机信号发射强度,对采集的数据进行分析以验证该系统在大范围地震废墟中的搜寻能力。实验结果证明,提出该方法系统可以对大范围的手机进行搜寻定位,信号来源方向较为稳定。

Mobile Phone Signal Location Analysis of Trapped People after Earthquake Based on Satellite Navigation

Aiming at the problems in the current method of mobile phone signal location, i.e., the limitation of location distance and the great influence of the change of signal propagation loss on the determination of signal source direction, a mobile phone signal location analysis method based on satellite navigation is proposed. From four aspects of the suddenness, destructiveness, social influence, and defensive difficulty of the earthquake, a portable mobile station is designed to extract the residual signal of the mobile phone through the GPS single difference model. Then, the average residual of mobile phone signals in the appointed area is calculated, and the root mean square of the mobile phone signals of each area is obtained. The mean square deviation is substituted into the two-difference equations of all seismic events, and the mobile phone signal intensity is solved. The positioning of mobile phone signals based on satellite navigation is realized by the angle of arrival measurement method. The collected data were analyzed to verify the ability of the system for searching in large-scale earthquake ruins. The experimental results show that the proposed method can search and locate a large range of mobile phones, and the signal source direction is stable.