| 摘 要： | It has been known that the error of measuring acousticveloicities of thin sediment layers by the well-known T~2-X~2 approach isusually untolerable,and that this approach is unavailable in the casewhere sea-bed is hard because no echo from any subsurface belowsea-bottom can be received.Therefore applying the ray-parametermethod to thin layers and the refraction.method to hard layers need tobe considered in an acoustic velocity measurement system composed of asound source and a towed hydrophone streamer.Some problems of practi-cal importance about the applications of the two methods,such asecho-data processing procedures and error estimations in measuring acous-tic veloicities,are discussed,and the effectiveness of theoretical analyseshas been verified through computer simulations.
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