介绍了模拟港口岸形、物标回波和其他助航物标回波的生成，雷达回波的干扰、遮挡和衰减，固定距标圈、电子方位线和活动距标圈的显隐与图像的有关裁剪算法等。
Also the details about the coast, target and other navigational subjects echo and the interference of echo and Ring, Ebl, Vrm of Radar and clipping algorithm etc.
综合用户显式反馈和用户隐式反馈的优点，本文还提出了一种用户建模的算法，即基于向量空间模型的混合建模方法。
Integrating the merits of user obvious feedback and user hiding feedback, a new user establishing model algorithm, namely a mix establishing model method based on vector space model is also proposed.
文中给出了显式和隐式算法。
The explicit algorithm and implicit algorithm arc then developed.
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