Abstract
Laser-induced acoustic (LIA) technology is a possible way of communicating from an air platform to an underwater target. The present paper describes a modulation method of n-multiple frequency shift keying (n-MFSK) used for improving the communication rate of LIA technology. The thermal expansion mechanism was selected as a way of generating an acoustic signal by the pulse laser in this work. Thus, the technology of pulsed repetition frequency (PRF) can be used to realize n-MFSK modulation by controlling laser frequency and allocating periods in the time domain. The results of numerical simulation show that n-MFSK modulation can improve the communication rate and band utilization compared with the traditional n-frequency shift keying (n-FSK) modulation.
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