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在雷达系统中,杂波的存在对目标的检测影响很大.因此,抑制杂波的算法显得非常重要。最近,我们用监视航线的 L 波段雷达观察杂波振幅得知;虽然各种杂波的形状各不相同,但都服从威布尔分布。根据这种结果提出的杂波抑制方法已得到广泛应用。所用的 L 波段雷达发射频率为1.3GHz,脉冲宽度为3μs,距离分辨率约为450m。本文也对脉冲宽度窄、距离分辨率高,从而使杂波性质变化的雷达作了分析。对脉冲宽度为80ns、距离分辨率高约12m 的 X 波段雷达,我们研制出一种40ns 的超高速数据抽样装置,通过对地杂波数据抽样研究了其性质。结果表明:X 波段地杂波振幅最可能的分布,呈以建筑物类回波信号为主要数据加上地面各层次回波信号数据的混合型威市尔分布。本文末提出了目标本身形成和不形成威布尔分布两种情况下的杂波抑制方法。
In the radar system, the presence of clutter has a great impact on the detection of the target, so it is very important to suppress the clutter. Recently, we observed the clutter amplitude by monitoring the L-band radar of the course of flight; all the clutters obey the Weibull distribution although their shapes are different. The clutter suppression method based on this result has been widely used. The L-band radar used has a transmission frequency of 1.3 GHz, a pulse width of 3 μs and a distance resolution of approximately 450 m. This paper also analyzes the radar with narrow pulse width and high range resolution, which makes the clutter change. For the X-band radar with pulse width of 80ns and distance resolution of about 12m, we developed a 40ns ultra-high-speed data sampling device and studied the properties of ground clutter data sampling. The results show that the most probable distribution of ground clutter amplitude in X band is the mixed Weirner distribution with echo signal of buildings as the main data plus the echo signal data of all levels on the ground. At the end of this paper, we propose a method to suppress clutter in two cases: the formation of the target itself and the formation of Weibull distribution.