More secure underwater acoustic frequency-hopping communication system based on chaotic sequence

Purpose. In naval underwater communication, security is very often highly important. Chaotic sequence is especially suitable when security is important. We are the first in China to present a secure underwater acoustic frequency-hopping (FH) communication system based on chaotic sequence. In the full paper, we explain in much detail secure underwater acoustic communication system with strong antijamming and anti-interruption capability; here we just list the three topics discussed in the detailed explanation; (1) underwater acoustic FH communication system; (2) chaotic FH pattern, whose three subtopics are balance property, correlation, and hopping gap; (3) analysis of performance of underwater acoustic FH communication system. The simulated results show preliminarily that the system's error bit rate is smaller than 10^-6 either when the SNR is bigger than -19 dB or when the SIR (signal interruption rate) is bigger than -13 dB and, at the same time, the SNR is equal or smaller than -15 dB. The 3 km, 10 km, and 15 km lake experimental results show preliminarily that underwater acoustic FH communication system based on chaotic sequence can be used in secure underwater acoustic communication.