文章摘要
薛敬宏,金铭,乔晓林.适应于声相关海流剖面仪的单脉冲发射信号设计[J].声学技术,2006,(5):397~400
适应于声相关海流剖面仪的单脉冲发射信号设计
Waveform design for acoustic correlation current profiler
投稿时间:2005-03-25  修订日期:2005-07-21
DOI:
中文关键词: 测速  声相关海流剖面仪  单脉冲发射
英文关键词: velocity measurement  ACCP  mono-pulse transmission
基金项目:
作者单位
薛敬宏 哈尔滨工业大学(威海)信息技术研究所, 山东, 威海, 264209 
金铭 哈尔滨工业大学(威海)信息技术研究所, 山东, 威海, 264209 
乔晓林 哈尔滨工业大学(威海)信息技术研究所, 山东, 威海, 264209 
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中文摘要:
      声相关海流剖面仪(ACCP)利用“波形不变性原理”进行测速,能够测得相对海底的绝对速度。相对于多脉冲发射体制,文章采用脉宽足够长的单脉冲进行发射,既增加了发射能量,提高了海底探测的深度,又保证了系统带宽的要求。单脉冲脉内采用相位编码,减少了测速噪声的影响,通过一个满足相关寻优准则的编码搜寻程序进行伪随机编码,编码长度与声相关延迟时间相一致,所产生编码的自相关函数具有双相关峰特性,这与双脉冲发射的测速体制相对应,解决了双脉冲发射体制测速中脉冲宽度和脉冲间隔时间之间的矛盾。
英文摘要:
      The principle of waveform invariance is used in measuring velocity of an acoustic correlation current profiler(ACCP) with bottom tracking capability to provide vessel-earth relative velocity.A single transmitted pulse with a sufficiently long duration is used to increase energy of the pulse packet and the operating range while maintaining a large bandwidth.The pulse is coded with phase coding for reducing noise variance.The coding technique involves pseudo-random codes generated by an optimal code finding program.The code length is specified with a desired time delay for correlation.The pulse has an additional autocorrelation peak at a predetermined time lag to give a function of dual peaks.Trade-off between pulse width and pulse interval is thus obtained.
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