| Based on the maritime communications network, the real-time confidential communications systems used for acoustic communications are researched. Moreover, as conserned as the real-time and secrecy requirements of system, based on the high-speed signal processing dual-DSP platform, frequency hopping patterns, synchronization, data confidentiality and data transmission technology of acoustic communication are researched.The main innovation and research results are as follows:1 A chaotic sequence with perfect balance and pertinence is designed based on the research on hopping communication theory and methodology, and the frequency-hopping pattern of the system is establishment. By comparing various synchronization methods, an efficient synchro capturing program based on FFT is presented. And the anti-jamming capability is improved by Error Control Coding Technology.2 According to data transmission theory, consider the characteristics of the real-time requirements, the structure of the data transmission of frequency hopping systems is optimized and data processing capabilities are improved; the manipulation of data transmission is strengthened by establishing communication protocal between dual-DSP; USB is applied to the communications between Host and DSP, the speed of data transmission is enhanced through the rational use of the USB data transmission, thereby the real-time processing capabilities is improved, too.3 In order to improve the security of system, data security technology is also researched.In addition to using frequency hopping to ensure secure transmission of information, encryption technology is used to ensure the secure storage. AES encryption algorithm is applied to the dual- DSP platform, the analysis of the processing results shows that it meets the real-time and secrecy requirements well.4 A real-time secure communication system is designed, the hardware of sending subsystem and receiving subsystem and software of dual-DSP platform are realized. |
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