线性调频在水声通信与组网中的应用研究
发布时间：2018-12-17 12:53
【摘要】：随着信息社会的快速发展,对于海洋的研究和开发越来越受到人们的重视,因此水下通信技术的研究成为了当今海洋资源开发、海洋环境的勘测以及军事战略的重要组成部分,成为了各国科研研究的热点。 水声信道因为其带宽有限、多径干扰严重、强噪声干扰、频率选择性衰落等特点使得水声信道成为了迄今为止无线通信中最复杂多变的通信信道之一。线性调频扩频技术不仅具有一般的扩频通信技术所共有的强抗干扰、抗衰落、极低的截获率、高保密性等优点,而且具有更好的抗多普勒频移、抗深度衰落性能。上述的优点使得线性调频扩频技术更加适合于水声通信技术的研究。 论文的主要工作如下： 1.对线性调频信号的扩频特性、较强的抗干扰和抗噪特性、良好的自相关特性、抗多径等性能进行了分析。然后,系统地介绍了基于线性调频扩频的水声通信系统的基本原理和特点,分析了CSS_BOK扩频通信系统的优点和缺陷。 2.对基于CSS_BOK的三种高阶水声通信系统的基本原理以及性能进行了较为全面的分析和仿真,并对于三种高阶调制系统从抗噪性、抗多径及载波偏移等角度进行了较为详细的分析。 3.介绍了基于CSS技术的三种多址接入技术,包括多载波多址技术、时间交叠多址技术以及基于FRFT变换的多调频率多址接入技术。并对其在水声信道中的性能进行了不同用户数条件下的仿真和分析。 4.本文构架了基于DM-BPSK、π/4-DM-DQPSK两种制式的水声网络仿真平台,该平台在仿真中加入上述两种调制方式和Bellhop射线模型,对浅海水声信道进行建模,在此基础上结合进行水声网络MAC协议仿真,研究传输范围变化对系统性能的影响。最后通过对仿真结果的分析和总结,仿真结果显示与水声信道的特性相符,对水下组网和MAC协议的改进具有一定的指导意义。
[Abstract]:With the rapid development of information society, people pay more and more attention to the research and development of the ocean. Therefore, the research of underwater communication technology has become an important part of the marine resources development, marine environment survey and military strategy. It has become the hot spot of scientific research all over the world. Underwater acoustic channel has become one of the most complex and changeable communication channels in wireless communication because of its limited bandwidth, serious multipath interference, strong noise interference and frequency selective fading. LFM spread spectrum technology not only has the advantages of strong anti-interference, anti-fading, extremely low interception rate and high security, but also has better anti-Doppler frequency shift and anti-depth fading performance. The advantages above make the LFM spread spectrum technology more suitable for underwater acoustic communication. The main work of this paper is as follows: 1. The spread spectrum characteristics, strong anti-jamming and anti-noise characteristics, good autocorrelation characteristics and anti-multipath characteristics of LFM signal are analyzed. Then, the basic principle and characteristics of underwater acoustic communication system based on LFM spread spectrum are introduced systematically, and the advantages and disadvantages of CSS_BOK spread spectrum communication system are analyzed. 2. The basic principle and performance of three high order underwater acoustic communication systems based on CSS_BOK are analyzed and simulated. The anti-multipath and carrier offset angles are analyzed in detail. 3. This paper introduces three kinds of multiple access technologies based on CSS technology, including multiple carrier multiple access technology, time overlapping multiple access technology and multiple frequency multiple access technology based on FRFT transform. Its performance in underwater acoustic channel is simulated and analyzed under the condition of different number of users. 4. In this paper, the underwater acoustic network simulation platform based on DM-BPSK, 蟺 / 4-DM-DQPSK is constructed. The above two modulation modes and the Bellhop ray model are added to the simulation to model the acoustic channel in shallow water. Based on the simulation of underwater acoustic network MAC protocol, the influence of transmission range on system performance is studied. Finally, by analyzing and summarizing the simulation results, the simulation results show that the simulation results are consistent with the characteristics of underwater acoustic channel, which has certain guiding significance for the improvement of underwater networking and MAC protocol.
【学位授予单位】：厦门大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.3
本文编号：2384224
[Abstract]:With the rapid development of information society, people pay more and more attention to the research and development of the ocean. Therefore, the research of underwater communication technology has become an important part of the marine resources development, marine environment survey and military strategy. It has become the hot spot of scientific research all over the world. Underwater acoustic channel has become one of the most complex and changeable communication channels in wireless communication because of its limited bandwidth, serious multipath interference, strong noise interference and frequency selective fading. LFM spread spectrum technology not only has the advantages of strong anti-interference, anti-fading, extremely low interception rate and high security, but also has better anti-Doppler frequency shift and anti-depth fading performance. The advantages above make the LFM spread spectrum technology more suitable for underwater acoustic communication. The main work of this paper is as follows: 1. The spread spectrum characteristics, strong anti-jamming and anti-noise characteristics, good autocorrelation characteristics and anti-multipath characteristics of LFM signal are analyzed. Then, the basic principle and characteristics of underwater acoustic communication system based on LFM spread spectrum are introduced systematically, and the advantages and disadvantages of CSS_BOK spread spectrum communication system are analyzed. 2. The basic principle and performance of three high order underwater acoustic communication systems based on CSS_BOK are analyzed and simulated. The anti-multipath and carrier offset angles are analyzed in detail. 3. This paper introduces three kinds of multiple access technologies based on CSS technology, including multiple carrier multiple access technology, time overlapping multiple access technology and multiple frequency multiple access technology based on FRFT transform. Its performance in underwater acoustic channel is simulated and analyzed under the condition of different number of users. 4. In this paper, the underwater acoustic network simulation platform based on DM-BPSK, 蟺 / 4-DM-DQPSK is constructed. The above two modulation modes and the Bellhop ray model are added to the simulation to model the acoustic channel in shallow water. Based on the simulation of underwater acoustic network MAC protocol, the influence of transmission range on system performance is studied. Finally, by analyzing and summarizing the simulation results, the simulation results show that the simulation results are consistent with the characteristics of underwater acoustic channel, which has certain guiding significance for the improvement of underwater networking and MAC protocol.
【学位授予单位】：厦门大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.3
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