King Abdullah University of Science and Technology (KAUST), Thuwal, Jeddah 23955, Saudi Arabia.
J Acoust Soc Am. 2011 Oct;130(4):1985-94. doi: 10.1121/1.3621469.
Two seismic applications of time reversal mirrors (TRMs) are introduced and tested with field experiments. The first one is sending, receiving, and decoding coded messages similar to a radio except seismic waves are used. The second one is, similar to radar surveillance, detecting and tracking a moving object(s) in a remote area, including the determination of the objects speed of movement. Both applications require the prior recording of calibration Green's functions in the area of interest. This reference Green's function will be used as a codebook to decrypt the coded message in the first application and as a moving sensor for the second application. Field tests show that seismic radar can detect the moving coordinates (x(t), y(t), z(t)) of a person running through a calibration site. This information also allows for a calculation of his velocity as a function of location. Results with the seismic radio are successful in seismically detecting and decoding coded pulses produced by a hammer. Both seismic radio and radar are highly robust to signals in high noise environments due to the super-stacking property of TRMs.
介绍了时间反转镜（TRM）的两个地震应用，并通过野外实验进行了测试。第一个应用是发送、接收和解码类似于无线电的编码消息，只是使用地震波。第二个应用类似于雷达监测，用于检测和跟踪远程区域中的移动目标（多个目标），包括确定目标的移动速度。这两个应用都需要事先在感兴趣的区域记录校准格林函数。该参考格林函数将被用作第一个应用中的编码消息的解密码本，以及第二个应用中的移动传感器。野外试验表明，地震雷达可以检测到在标定场地中奔跑的人的移动坐标（x(t)，y(t)，z(t)）。该信息还可以计算他的速度作为位置的函数。地震无线电在地震检测和解码由锤子产生的编码脉冲方面取得了成功。由于 TRM 的超叠加特性，地震无线电和雷达在高噪声环境中的信号都具有很高的稳健性。
