LAUSR

ABSTRACT Huang, T. and Wang, T., 2019. Research on analyzing and processing methods of ocean sonar signals. In: Gong, D.; Zhu, H., and Liu, R. (eds.), Selected Topics in Coastal Research: Engineering, Industry, Economy, and Sustainable Development. Journal of Coastal Research, Special Issue No. 94, pp. 208–212. Coconut Creek (Florida), ISSN 0749-0208. In the marine environment, the use of sonar equipment is very extensive. The widespread application of sonar equipment in military and civilian fields has promoted the rapid development of sonar technology, and the sonar system is gradually developing toward multi-bases and large-scale direction. The analyzing and processing of ocean sonar signals has become an important part of sonar system design. Based on the environmental conditions of the Zhanjiang sea area in Guangdong Province, this paper designs the ocean sonar signal waveforms, analyzes the sonar signals with appropriate methods, and constructs an ocean sonar signal processing platform. The research results show that in the marine environment, multi-base sonar system can realize continuous transmitting of sonar signals and receive echoes to achieve continuous detection of targets. Continuous sonar signals have a lower signal-to-noise ratio (SNR) than pulse sonar signals, but continuous sonar signals have a longer time bandwidth product (TBP), which reduces the negative impact of the ocean environment. The Gold-sequence phase modulated (PM) signals have strong reliability and good concealment performance. The signals can occupy the entire bandwidth. The signal processing is not limited by the number of transmitting stations, but its signal forms are more complicated, the signal analysis is cumbersome, and the processing platform is highly demanded. The research in this paper provides a theoretical basis for ocean sonar signal analyzing and processing.