一、引言雷达通常用来探测在地面或在空中的小尺寸(小等效截面)动目标,目标的数量不多,但常常淹没在被称为“杂波”的寄生回波很强的背景中(杂波通常指不规则物体的无序聚集)。杂波由大气回波,也可由在地球表面的回波组成。大气回波可由以云或雨形式出现的水滴,也可由所谓“假目标”组成。这些假目标给出了厚 I. INTRODUCTION Radar is usually used to detect moving targets of small size (small equivalent cross section) on the ground or in the air. The target number is small but often submerged in a background with strong parasitic echoes called “clutter” Medium (clutter usually refers to the disorderly aggregation of irregular objects). Clutter is echoes from the atmosphere and can also consist of echoes on the Earth’s surface. Atmospheric echoes can be water drops that appear in the form of clouds or rain and can also consist of so-called “false targets.” These fake targets are given thick