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This paper presents a long-distance underwater acoustic communication remote control method in which airgun is used as the source. This method expands the range of underwater remote and supports underwater robots to work together. The pulse signal (produced by airgun) source level, frequency and consistency of multiple transmission analyze the feasibility of airgun as the underwater acoustic communication signal source. Based on instruction-level remote control information transmission needs, proposes delay pulse coding method and signal detection and identification method. Under different hydrological environmental conditions, do simulation and analysis, provides an alternative technological approach for long-distance underwater acoustic communication remote control. Introduction Airgun uses the underwater instant release of high pressure air stored in chamber to produce intense sound waves. Because of its excellent low-power features, it has been widely used in the field of marine geological survey, oil exploration, seismic wave research. In this paper, the airgun is used as underwater acoustic communication source, make use of the characteristics that low-frequency high-power pulse signal (generated by the underwater instant release of high pressure air)can transmit over a long distance, use the pulse delay coding, match filtering and dual-α filtering detection method to solve the transient pulse signal coding, detection and identification issues, realize long-distance underwater remote communication. The remote distance is expected to reach hundreds of kilometers. Long-distance underwater robots operational requirements are satisfied. The Pulse Signal Encoding Method The existing references have confirmed that the airgun source waveform consistency is very high under the same condition of acoustic source structure and trigger. There’s much better consistency between pulse signals which generated through multiple trigger. The statistical correlation coefficient of multiple emission of airgun acoustic source can be up to 0.996 [1]. Thus, the characteristic of acoustic impulse signal which generated by airgun acoustic source that possess controllability and repeatability. The acoustic impulse signal is used for instruction level underwater acoustic communication through coding for continuous trigger pulse sequence adjusting the variable parameters (Triggered delay time, Cabin pressure). While the system implementing the remote low-speed underwater acoustic communication, we only send instruction-level information such as “start”, “operating mode n”, “standby”, etc. There’s less demanding on the communication bandwidth and complex coded modulation communication system. For instruction encoding, we can adopt pulse delay coding. The information can be expressed as multiple pulses interval. As we all known, the most suitable form of channel coding should be transmitted in the form of white noise. In other words, the symbol 0 and the symbol 1 should not continuously connect in line with the form of white noise. So the first step of optimizing the code is to get rid of the instruction

The Analysis and Simulation of Remote Underwater Communication Method Based on Airgun Source