| 摘要 |
A method and apparatus for electronically providing information as to the distance between two spaced locations, the information being particularly useful for determining and controlling position in offshore operations such as pipeline and cable laying, surveying and other such operations requiring extremely accurate position information. The range information provided by the present invention is extremely accurate since the system dynamically eliminates errors due to unpredictably varying equipment introduced signal delays as well as the relatively fixed signal delays introduced by the equipment. This results in the extremely accurate position information required for offshore operations when the system is utilized to determine the range to two locations from the unknown offshore position so that the unknown position can be determined by conventional trigonometric techniques.
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