【摘要】 针对多数生命探测装置只能探测震后灾害环境某一区域的生命体信息的现状,采用物联网技术,将大量超声传感器节点分布于现场环境中,对各个区域内的生命体进行定位.为提高多生命体目标定位性能,发射端采用混沌编码和二值频移键控构造超声传感器的扩频发射信号,相关技术被用于接收端解扩.采用了遗传算法优化混沌初值以提高回声信号相关效果.实验结果表明,物联网超声传感器节点采用优化二值频移键控作为发射信号可实现多个生命体同时定位,定位绝对误差在4.0cm以内.更多还原

【Abstract】 According to the present situation of life detection instrument,which can only detect regional life information in post-earthquake disaster environment,the internet of things technique is applied in multi-life targets location system. Many ultrasonic sensor nodes are distributed in the field environment to locate the multi-life targets in each region. To improve the performance of multi-life location system based on internet of things,the chaotic codes with Binary Frequency Shift Keying( BFSK) were used to construct the spread spectrum emission signals for ultrasonic sensors. Correlation technique in the receiving circuit was used to despread. In order to improve the echo signal correlation effect,genetic algorithm was applied to optimize chaotic initial values. The experimental results demonstrated that the ultrasonic multilife location system based on internet of things with optimized BFSK emission could realize the simultaneous location of multiple live subjects with maximal 4. 0cm absolute error.更多还原