Absolute Velocity Estimates from Autonomous Underwater Gliders Equipped with Doppler Current Profilers

Absolute Velocity Estimates from Autonomous Underwater Gliders Equipped with Doppler Current Profilers
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配备多普勒电流剖面仪的自主水下滑翔机的绝对速度估计

DOI:
10.1175/jtech-d-16-0156.1
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发表时间:
2017
影响因子:
2.2
通讯作者:
George, Lawrence
George, Lawrence
中科院分区:
地球科学4区
文献类型:
--
作者:
Todd, Robert E.;Rudnick, Daniel L.;Sherman, Jeffrey T.;Owens, W. Brechner;George, Lawrence

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自主水下滑翔机上的多普勒流速剖面仪测量垂直范围为0(10)米的相对于运动滑翔机的水速度。使用1 MHz Nortek声学多普勒双海流剖面仪(AD2CP)对部署在南加州外、加拉帕戈斯群岛以西和墨西哥湾流中的Spray滑翔机进行测量,以演示估算海洋上部1000 m处绝对水平速度的方法。最接近滑翔机的相对速度测量值用于推断与潜水有关的飞行参数,然后用于校正绝对垂直平均电流的估计值,以说明在长达数月的滑翔机任务期间生物污垢的积累。结合多普勒剖面仪测量的相对速度与绝对参考,以估计绝对水平速度的配置文件的逆方法进行审查和扩展,包括额外的限制速度的解决方案。被认为是从仪器的偏见和减少在深度的声学散射体丰度所产生的错误。虽然这些技术是用特定的平台和仪器组合的测量结果来证明的,但它们应该适用于滑翔机和多普勒海流剖面仪的其他组合。
Doppler current profilers on autonomous underwater gliders measure water velocity relative to the moving glider over vertical ranges ofO(10) m. Measurements obtained with 1-MHz Nortek acoustic Doppler dual current profilers (AD2CPs) on Spray gliders deployed off Southern California, west of the Galápagos Archipelago, and in the Gulf Stream are used to demonstrate methods of estimating absolute horizontal velocities in the upper 1000 m of the ocean. Relative velocity measurements nearest to a glider are used to infer dive-dependent flight parameters, which are then used to correct estimates of absolute vertically averaged currents to account for the accumulation of biofouling during months-long glider missions. The inverse method for combining Doppler profiler measurements of relative velocity with absolute references to estimate profiles of absolute horizontal velocity is reviewed and expanded to include additional constraints on the velocity solutions. Errors arising from both instrumental bias and decreased abundance of acoustic scatterers at depth are considered. Though demonstrated with measurements from a particular combination of platform and instrument, these techniques should be applicable to other combinations of gliders and Doppler current profilers.
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