This paper deals with extraction of spectral lines of underwater targets in background noise using a space-time integral method.
利用目标线谱与自噪声线谱在时间域和空间域上的差异，采用时空联合手段研究舰船噪声中目标线谱的提取方法。
Solving integral equations of supercavitating flow based on the finite difference time discretization method, some numerical results are obtained.
采用时间有限差分离散化方法求解超空泡流积分方程，得到了问题的数值解。
The relationship between the true anomaly and the time is gotten by the numerical integral method.
用数值积分方法求出真近点角与时间的关系曲线。
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