Abstract
Abstract We propose a new approach to monitor the horizontal gradient of sound speed in ocean for its correction on seafloor positioning using the GPS/acoustic technique. The new method requires five seafloor transponders to solve five parameters: δx, horizontal position of a transponder array; δt, a common delay in traveltimes due to the stratified component of sound speed; ∇ t, the gradient of traveltime delays among the transponders associated with the sound speed gradient. We also numerically evaluate the geometrical strength of the five transponders’ layout and observation point to avoid possible trade-off among the parameters.
Highlights
Since the seafloor positioning technique was presented (Spiess, 1985) and demonstrated (Spiess et al, 1998), several research groups have developed observation systems at regions attracting their interest
We propose a new approach to monitor the horizontal gradient of sound speed in ocean for its correction on seafloor positioning using the GPS/acoustic technique
The new method requires five seafloor transponders to solve five parameters: δx, horizontal position of a transponder array; δt, a common delay in traveltimes due to the stratified component of sound speed; ∇t, the gradient of traveltime delays among the transponders associated with the sound speed gradient
Summary
Motoyuki Kido RCPEV, Graduate School of Science, Tohoku Univ., Aoba-ku, Sendai, 980-8578, Japan (Received June 15, 2007; Revised July 23, 2007; Accepted July 25, 2007; Online published August 30, 2007). We propose a new approach to monitor the horizontal gradient of sound speed in ocean for its correction on seafloor positioning using the GPS/acoustic technique. The new method requires five seafloor transponders to solve five parameters: δx, horizontal position of a transponder array; δt, a common delay in traveltimes due to the stratified component of sound speed; ∇t , the gradient of traveltime delays among the transponders associated with the sound speed gradient. We numerically evaluate the geometrical strength of the five transponders’ layout and observation point to avoid possible trade-off among the parameters
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