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不同特性阻抗参数对深海走航投弃式剖面仪传输信道影响的分析 被引量:2

Analysis on the Effect of Impedance Parameters with Different Characteristics on the Transmission Channel of Deep-Sea Abandoned Measuring Instruments
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摘要 深海走航投弃式剖面仪由于信道的时变特性,严重影响信号传输的准确性,成为深海走航投弃式剖面仪进一步发展的难题。针对该类信道进行了深入分析,首先提出了信道模型的建立方法,建立了准确的信道模型传递函数,并在此基础上,讨论了在3 000 m长传输线下,不同特性阻抗参数对信号传输性能的影响。通过分析可知:(1)在负载端使用大电阻可以极大地降低水上线轴电感量变化对信号的影响,最佳电阻取值为10 MΩ;(2)通过提高水下线轴电感量的方法可以提高信道相位延时的稳定性,从而提高DPSK信号解调的准确性;(3)为了让负载端获得稳定的幅值增益,要减小分布电容的数值,在信道中加入容性元件会降低信号幅值的稳定性,降低信号的传输质量。通过本文的分析,可以进一步明确对该特殊信道阻抗匹配方法,优化信道硬件电路模型,加快走航投弃式剖面仪向深海进军的步伐。 The time-varying channel of deep-sea abandoned measuring instruments has an adverse effect on the accuracy of signal transmission, which has become a serious problem for the further development of deep-sea abandoned measuring instruments. A detailed analysis is provided in this paper. It puts forward the method of channel modeling, with an accurate transfer function of the model established. On the basis of the transfer function, this paper discusses the influence of impedance parameters with different characteristics on signal transmission performances at the situation of 3 000 m long transmission line. Through the analysis, it can be concluded that:(1) the use of large resistance at the load end can greatly reduce the effect of inductance change of above-water spool on signal transmission, with the optimal resistance value of 10 M Ω;(2) the method of increasing the inductance value of underwater spool can improve the stability of channel in phase delay, so as to improve the accuracy of the signal demodulation of DPSK;(3) in order to obtain a stable amplitude gain, the value of distributed capacitance should be reduced as far as possible. Insertion of capacitive elements can reduce the signal amplitude stability and transmission quality. Through the analysis in this paper, it can further clarify the impedance matching method for this special channel, optimize the channel hardware circuit model, and speed up the application of abandoned measuring instruments in deep-sea exploration.
出处 《海洋技术学报》 2015年第5期12-18,共7页 Journal of Ocean Technology
基金 天津市应用基础与前沿技术研究计划资肋项目(14JCYBJC16300) 国家自然科学基金资助项目(41206031)
关键词 抛弃式测量仪 阻抗参数特性 传递函数 阻抗匹配方法 abandoned measuring instruments impedance parameter characteristics transfer function impedance matching method
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