文章摘要
王森,赵海潮,马晓民.被动定向浮标数字解复用技术[J].声学技术,2008,(1):1~4
被动定向浮标数字解复用技术
Digital technique for DIFAR demultiplexer
投稿时间:2007-01-30  修订日期:2007-05-12
DOI:
中文关键词: 浮标  解复用  数字锁相环  矢量传感器
英文关键词: sonobuoy  demultiplexer  PLL  vector sensor
基金项目:国家863计划资助项目(2002AA639510)
作者单位E-mail
王森 杭州应用声学研究所, 浙江 杭州, 310012 glasseyewang@163.com 
赵海潮 杭州应用声学研究所, 浙江 杭州, 310012  
马晓民 杭州应用声学研究所, 浙江 杭州, 310012  
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中文摘要:
      介绍了被动定向浮标信号传输系统中复合信号解复用的工作原理,推导了解复用的过程,解释了罗盘补偿矢量传感器自转对浮标测向的影响。提出了一种解复用的数字信号处理算法,在信号处理板上软件实现解复用。设计了一种软件导频锁相环,解决了偶极子信号解调过程中频率相位精确跟踪的问题。该技术降低了浮标接收机的复杂性,保证了通道一致性,提高了可靠性和定向精度,同时降低了浮标的成本。通过仿真对导频锁相环的性能作了评价,并通过湖上试验对其进行了验证。
英文摘要:
      The principle of the demultiplexer in sonobuoy is introduced.Influence of compass compensation to vector sensor′s self rotation on direction-finding is explained.A new technique with software based on digital signal processing(DSP) instead of hardware is presented.A kind of software pilot phase located loop(PLL) is designed to get precise frequency and phase tracking in demodulation.The approach also provides other benefits such as simplifying the receiver complexity,improving the reliability,elimi-nating the unbalance between N/S channel and E/W channel and increasing the accuracy of localization.Performance of software frequency piloted PLL is evaluated via computer simulation and experiment in lake.
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