In order to quickly and effectively implement the fire rescue,commanders need to know the locations of each firefighter in the fire scene and command in real time.However,the transmission power of the fire emergency communication signal may be attenuated in buildings and other environments,and affects the communication effect.In order to estimate the required minimum transmission power,it's necessary to know the penetration characteristics of electromagnetic wave in a complex building.The transmission loss of the electromagnetic wave communication signal in space was calculated by using the formula of electromagnetic wave space loss,and the penetration loss of the communication signal passing through the wall was calculated by using the finite difference time domain method.The attenuation of electromagnetic in complex eveironment was calculated combined with these two methods.Three models of fire emergency communication were established.The results show that the more complex the buildings,the greater attenuation of the electromagnetic waves.Meanwhile,the signal with the minimum transmission power can be obtained through some calculations.%在发生火灾时,为了使消防救援迅速有效地实施,指挥员需要实时了解每一个消防员在火灾现场的位置,并进行指挥作业.但是消防通信信号受到建筑物等环境的影响而衰减,影响通信的效果,因此需要研究复杂建筑中电磁波的穿透特性,以得到消防通信中所需要的最小发送功率.利用电磁波空间损耗公式计算电磁波通信信号在空间的传输损耗,并利用时域有限差分法计算通信信号通过墙体时的穿透损耗,结合这两种方法计算电磁波在复杂消防环境中的衰减情况.建立了3种消防通信的仿真模型,仿真结果表明,建筑物越复杂电磁波衰减越大,并通过计算分析得出消防信号最小的发送功率.
展开▼
