首先分析了红外小目标、噪声及其杂波特性，提出了用小窗口的二维中值滤波进行背景估计；
Firstly, a background estimation method based on small window and two dimension median filter is presented after detail analysis of the model of small infrared target, noise and clutter.
中值滤波较通常的二维视速度滤波更能有效地突出波组特征，分离VSP波场的效果也较二维滤波优越。
Median filtering can highlight wave band better than 2-d velocity filtering does. It also causes a better VSP wave field separation.
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