强背景杂波下月球次表面回波的识别方法

Identification of lunar subsurface echoes from radar sounder echoes with strong background surface off-nadir clutters

摘要:

为有效探测月球次表层结构，本文基于月球次表面天底点回波和表面非天底点回波(杂波)的相干与非相干特性，提出在月球次表面地形变化不大的情况下，由累积取平均的方法来减小表面非天底点回波从而识别次表面回波的方法。以数值模拟的月海与月陆表面雷达探测仪回波为例，验证了该方法的正确性与可行性，并讨论了累积平均数目对次表面回波提取结果的影响。本文所述方法也可以应用到火星等其他外星球次表层结构的探测中。

Abstract:

An effective approach for subsurface echo extraction was developed on the basis of the coherent and incoherent characteristics of the subsurface nadir echoes and surface off-nadir echoes (clutter). By stacking and averaging the received radar sounder echoes at different time series，subsurface echo could be identified if the subsurface topography variation was not too large. Taking the simulated radar sounder echoes from lunar maria and highlands area as example，this study verified the feasibility of this approach numerically. Finally，the influence on subsurface echo identification by the stacking number and surface roughness was discussed. The approach in this paper can be applied to Martian and other planetary exploration.