合成孔径高度计的距离校正

Range Correction in Synthetic Aperture Radar Altimeter

在高度计中使用合成孔径技术正在成为当前国际上高度计技术领域内一个新的研究热点。本文首先简单介绍了传统雷达高度计的测距原理,然后介绍了在雷达高度计中引入合成孔径技术的思想。通过分析高度计中合成孔径处理的特点,说明在高度计中使用合成孔径技术时,应该进行距离校正。本文从高度计的多普勒波束锐化对应的几何模型和合成孔径雷达回波信号的相位分析两个角度分析了距离校正的方法,给出了距离校正的思路和校正公式。

The synthetic aperture technology was introduced into the conventional radar altimeter, and study on its concept and technology has becoming actively. This paper presents the theory of range measurement in conventional radar altimeter briefly first, and then presents the concept of introducing synthetic aperture technology into the radar altimeter. Characteristics of synthetic aperture processing in radar altimeter show that range correction should be done. Range correction method and equation are deduced respectively from geometry model of Doppler beam sharpen and analyzing the phase of synthetic aperture radar echo waves.