Development of small ADCP with a memory for off-line data processing

具有离线数据处理存储器的小型ADCP的开发

基本信息

  • 批准号:
    06555146
  • 负责人:
  • 金额:
    $ 3.58万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research (B)
  • 财政年份:
    1994
  • 资助国家:
    日本
  • 起止时间:
    1994 至 1995
  • 项目状态:
    已结题

项目摘要

In 1994, the basic plan for developing the equipment was firstly studied. A trial equipment was improvised and tested. However, the product was lost when the building and the factory of Aleck Electronics Ltd fell down because of the earthquake in the area of South Hyogo in January, 1995.In 1995, a trial production and a test was started again after the company was reconstructed. Then the basic plan was revised with a consideration of the easiness of obtaining parts and the period of research as well as the performance of the equipment : One pulse type with a frequency of 800kHz is adopted. In the estimation of Doppler shift, the variation of wave period is directly measured, ie, the period of gate signal whose frequency is reduced from the original echo signal by mixing a wave of constant frequency and by a low pass filter is measured by a digital clock of 20 MHz.A field experiment was carried out in the Lake Kasumigaura in order to investigate the appropriate method for off-line data processing which was the major subject of this research. An ordinal ADCP makes an on-line data processing during measurement in order to make the output signal more stable, which is "simple averaging" because of the restriction of time. However, most of information contained in the original data is lost through this process. On the other hand, because the new ADCP stores the original time series, we can adopt any sophisticated mathematics for data processing after the measurement. A combination of "moving AR model" and "moving average" got the best result among 6 methods of data processing which authors investigated. This method generates a time series of velocity which has the most stability and the finest time resolution.ADCP data obtained from a moving boat has a kind of error which is generated by rolling and pitching of the boat. The characteristics of the error is investigated and a method for data correction was developed.
1994年,首次研究了研制该设备的基本方案。临时制作了一个试验设备并进行了测试。但是,由于1995年1月兵库县南部发生地震,Aleck Electronics Ltd的建筑物和工厂倒塌,产品丢失。1995年,公司重建后,再次开始试生产和测试。然后,考虑到零件的容易获得和研究周期以及设备的性能,对基本方案进行了修改:采用频率为800kHz的一种脉冲类型。在多普勒频移估计中,直接测量波周期的变化,即,利用20 MHz数字时钟测量了通过混合一个恒定频率的波和一个低通滤波器从原始回波信号中降低频率的门信号的周期。线数据处理,这是本研究的主要课题。普通ADCP在测量过程中进行在线数据处理,使输出信号更加稳定,由于时间的限制,这种处理方式属于“简单平均”。然而,原始数据中包含的大部分信息在此过程中丢失。另一方面,由于新的ADCP存储了原始时间序列,因此我们可以在测量后采用任何复杂的数学方法进行数据处理。在作者研究的6种数据处理方法中,“移动AR模型”和“移动平均”的组合效果最好。该方法产生的速度时间序列具有最高的稳定性和最好的时间分辨率。ADCP数据从一艘运动的船只获得的一种误差,这是由船的横摇和俯仰产生的。分析了误差的特点,提出了数据校正的方法。

项目成果

期刊论文数量(4)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
若岡圭子、横山勝英、石川忠晴、長尾正之: "船の動揺蛇行によって生じるADCPデータの誤差補正について" 東工大土木工学科研究報告. 54. 1-10 (1996)
Keiko Wakaoka、Katsuhide Yokoyama、Tadaharu Ishikawa、Masayuki Nagao:“船舶蜿蜒运动引起的 ADCP 数据错误的校正”东京工业大学土木工程系研究报告 54. 1-10 (1996)。
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    0
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Keiko WAKAOKA,Katsuhide YOKOYAMA,Tadaharu ISHIKAWA: "The characteristics of ADCP data obtained in lakes and reservoirs and data processing method for its correction" Annual Journal of Hydraulic Engineering, JSCE. Vol.41. 1041-1047 (1997)
若冈惠子、横山克秀、石川忠治:“湖泊水库ADCP数据的特征及其修正的数据处理方法”,日本水利工程学报,水利工程学报。
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    0
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若岡圭子、横山勝英、石川忠晴: "湖沼・貯水池におけるADCP観測の問題点と誤差補正に関する研究" 水工学論文集. 41. 1041-1047 (1997)
若冈庆子、横山克英、石川忠治:“湖泊水库ADCP观测问题及误差修正研究”水利工程学报41。1041-1047(1997)。
  • DOI:
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  • 影响因子:
    0
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Keiko WAKAOKA,Katsuhide YOKOYAMA,Tadaharu ISHIKAWA and Masayuki NAGAO: "Correction of ADCP data affected by rolling and meandering of a carring boat" Technical Report.Dept.Civil Engineering, Tokyo Institute of Technology. No.54. 1-10 (1996)
Keiko WAKAOKA、Katsuhide YOKOYAMA、Tadaharu ISHIKAWA 和 Masayuki NAGAO:“修正受载船横摇和蜿蜒影响的 ADCP 数据”技术报告。东京工业大学土木工程系。
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    0
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ISHIKAWA Tadaharu其他文献

ISHIKAWA Tadaharu的其他文献

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{{ truncateString('ISHIKAWA Tadaharu', 18)}}的其他基金

Transition of hydraulic and sedimentary conditions in a river estuary under seasonal flow variations
季节性流量变化下河口水力和沉积条件的转变
  • 批准号:
    20360217
  • 财政年份:
    2008
  • 资助金额:
    $ 3.58万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Behavior of fine sediment and its effect on the formation of hypoxia in estuaries.
河口细泥沙行为及其对缺氧形成的影响.
  • 批准号:
    13450202
  • 财政年份:
    2001
  • 资助金额:
    $ 3.58万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
A Field Study on Salinity Circulation in Lake Ogawara
小河原湖盐度循环的实地研究
  • 批准号:
    09450187
  • 财政年份:
    1997
  • 资助金额:
    $ 3.58万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
A Basic Study on Environmental Study at Primary School by Introducing Public Works
介绍公共工程对小学环境学习的基础研究
  • 批准号:
    07650637
  • 财政年份:
    1995
  • 资助金额:
    $ 3.58万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
A Study on the Roughness Factor and the Stability of a Composite Channel.
复合通道的粗糙度因子和稳定性研究。
  • 批准号:
    59550338
  • 财政年份:
    1984
  • 资助金额:
    $ 3.58万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)

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