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: δ x , horizontal position of a transponder array; δ t , 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
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机译：我们提出了一种新的方法来监测海洋中声速的水平梯度，以便使用GPS /声学技术对海底定位进行校正。新方法需要五个海底应答器来求解五个参数：δx，应答器阵列的水平位置; δt，是声速的分层分量所导致的旅行时间上的常见延迟; ？ t ，与声速梯度相关的转发器之间的传播时间延迟梯度。我们还对五个应答器的布局和观察点的几何强度进行了数值评估，以避免参数之间可能的取舍
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