Experimental study on underwater acoustic signal recovery technique based on chirp-modulation passive time reversal using multi-receive array

Time reversal (TR) have been widely used in underwater acoustic signal recovery. When compared with active TR, passive TR can achieve spatial-temporal compression with one-way propagation, which is more convenient to apply and can reduce the system requirement. Chirp signal, which has unique pulse compression, can effectively be combined with conventional phase, frequency, amplitude modulation with lower transmitting power. Based on the above, underwater acoustic signal recovery technique based on chirp-modulation passive time reversal using multi-receive array is proposed in order to improve the system performance and efficiency, and simplify the operation. Experimental results show that fast signal recovery can be achieved based on the time domain overlap, passive TR and multi-receive can effectively reduce the impact of multi-channel, simplify the operation process, reduce the complexity of the subsequent equalizer and computational complexity, and improve the system performance.