echo arrival中文什么意思

echo: n. (pl. echoes) 1.回聲，反響；共鳴，反 ...
arrival: n. 1.到達，抵達。 2.到達者；到達物。 3.出現(xiàn)， ...
and arrival: 及到達
arrival: n. 1.到達，抵達。 2.到達者；到達物。 3.出現(xiàn)，登場。 4.新生嬰兒。 The new arrival was a daughter. 新生嬰兒是一個女孩。 a new arrival 新來者；新到貨；新生兒。 arrival at a conclusion 得出結論。 on his arrival at sixty 年滿六十。 cash on arrival 【商業(yè)】貨到付款。 delivery on arrival 【商業(yè)】貨到即交。
on arrival: 到達貨物相抵后凈額; 抵達時; 一到達就…

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The claim has been made upon the results that the wmt method should be used in the area near the vertical , while the phase difference method in slant beams and a rule has been given to select among those two methods according to the " effect value " on condition the depth is known for the consideration of improving the measurement precision , this paper studies the factors which affect the toa measurements , and three expressions of precision has been introduced as to applications of phase difference method , this paper introduces an automatic hunting method based on amplitude power to get the range of echo arrival
采用方差分析的方法，使用重復海試數(shù)據(jù)對wmt法和相位差法的優(yōu)劣進行了分析，指出了垂直附近應該使用wmt法，而傾斜波束應該使用相位差法；給出了在深度真實值已知前提下wmt法和相位差法使用的判決準則，即根據(jù)效應值的大小來選擇。本文從提高測量精度角度出發(fā)，分析并驗證了影響toa測量精度的因素；給出了三種精度表示。在應用相位差法時，引入了一種基于幅度能量的區(qū)間自動搜索方法；實驗表明該方法能很好地確定回波到達的大概時間范圍。

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