Shooter Localization in Wireless Microphone Networks
Shooter Localization in Wireless Microphone Networks
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DOI：
10.1155/2010/690732
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发表时间：
2010-02
影响因子：
1.9
通讯作者：
D. Lindgren;O. Wilsson;F. Gustafsson;H. Habberstad
中科院分区：
文献类型：
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作者：
D. Lindgren;O. Wilsson;F. Gustafsson;H. Habberstad
研究了无线麦克风网络中的枪手定位问题。来自枪声的声枪口爆炸（MB）和来自子弹的弹道冲击波（SW）都可以被麦克风检测到，并被认为是测量。MB测量引起标准的传感器网络问题，类似于蜂窝电话网络中的到达时间差，并且定位精度是好的，前提是与MB检测精度相比传感器被很好地同步。SW的检测时间取决于射击者位置和瞄准角度，并且可以提供除了射击者位置之外的附加信息，但是这同样需要良好的同步。我们分析的方法，在每个传感器的MB和SW的时间差的基础上的估计，这变得不敏感的同步不准确。Cramér-Rao下限分析表明均方根误差的下限如何分别取决于MB和MB-SW差的同步误差。估计问题制定在一个可分离的非线性最小二乘框架。不同类型弹药的现场试验结果表明，使用MB-SW差对射手的位置和瞄准角度进行测量具有出色的精度。
Shooter localization in a wireless network of microphones is studied. Both the acoustic muzzle blast (MB) from the gunfire and the ballistic shock wave (SW) from the bullet can be detected by the microphones and considered as measurements. The MB measurements give rise to a standard sensor network problem, similar to time difference of arrivals in cellular phone networks, and the localization accuracy is good, provided that the sensors are well synchronized compared to the MB detection accuracy. The detection times of the SW depend on both shooter position and aiming angle and may provide additional information beside the shooter location, but again this requires good synchronization. We analyze the approach to base the estimation on the time difference of MB and SW at each sensor, which becomes insensitive to synchronization inaccuracies. Cramér-Rao lower bound analysis indicates how a lower bound of the root mean square error depends on the synchronization error for the MB and the MB-SW difference, respectively. The estimation problem is formulated in a separable nonlinear least squares framework. Results from field trials with different types of ammunition show excellent accuracy using the MB-SW difference for both the position and the aiming angle of the shooter.