时反法用于主动探测的研究与仿真

时反法是一种新颖的自适应聚焦技术,它可以使声信号在未知环境下实现时空聚焦。海洋是一个复杂多变的信道,它会使信号波形在时域上发生畸变,能量在空间上发生扩散从而降低了声纳系统的检测能力。分析了时反法的原理,并进一步分析了时反法用于主动探测的过程。利用射线声学建立了浅海信道模型,对时反法主动探测技术进行了仿真分析。仿真结果表明,它可以使发生扩展的信号在时域上重新得到压缩,并使扩散的能量在目标处聚焦,从而实现对目标进行探测。

Study of Active Detection Based on Time Reversal and Simulation

Time reversal is a unique self-focusing technique for spatial and temporal focusing of sound in unknown environments. Ocean is a complicated and changeable channel which may distort the signal in the time domain and diffuse the energy, so the detecting performance of sonar will be degraded. The principle of time reversal and the process of active detection using this technology were analyzed. The simulation using a propagation channel model based upon ray acoustics was proposed. Simulation results show that this technology can compress the signal which is expended in the time domain and focus the diffused energy on the object, so it can be used in active detection.