研究一类弱非线性内波导致的声信号幅度起伏机理。
Thirdly, the fluctuation of sound signal amplitude caused by one kind of non-linear internal waves is analyzed.
目标模型包括船舶的距离、方位、速度和回波幅度、幅度起伏。
The model of radar target is composed of distance, bearing, speed, heading and amplitude of echo, fluctuation.
最后在第三部分，研究一类非线性内波导致信号幅度起伏机理。
The fluctuation of sound signal amplitude caused by one kind of non-linear internal waves is analyzed in third part.
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