基于偏振检测技术的海面太阳耀光抑制方法

Method of Suppressing Sea Surface Solar Flare Based on Polarization Detection Technology

为了更好地抑制太阳耀光对海面目标探测的影响,基于偏振检测技术并结合背景水体、太阳耀光与典型海洋目标三者之间的偏振特性差异提出了一种海面太阳耀光抑制方法。分析了观测天顶角、太阳天顶角对太阳耀光背景下海面目标偏振度以及海面目标与太阳耀光背景对比度的影响,结果表明,在晴朗天气下对海面目标进行探测时,背景辐射主要受太阳辐射从海面直接反射产生的辐亮度影响。可见光波长550nm与670nm对太阳耀光的抑制效果无明显差异,均在53°观测天顶角附近、50°~60°太阳天顶角方向以及太阳天顶角和观测天顶角之和为106°左右时对太阳耀光的抑制效果较好。该研究对于提升海面目标与太阳耀光背景图像的对比度以及海面太阳耀光背景下的目标检测效果具有重要意义。

In order to better suppress the influence of solar flare on sea surface target detection,a sea surface solar flare suppression method is proposed based on polarization detection technology and the difference of polarization characteristics among background water body in this paper,solar flare and typical marine targets.The effects of observation zenith angle and solar zenith angle on the polarization of sea surface targets under the background of the solar flare and the contrast between sea surface targets and solar flare background are analyzed.The results show that when detecting sea surface targets in sunny weather,the background radiation is mainly affected by the irradiance caused by the direct reflection of solar radiation from the sea surface.There is no significant difference between the visible light wavelengths of 550 nm and 670 nm in the inhibition effect of solar flare.The inhibition effect of solar flare is better when the observation zenith angle is near 53°,50°--60°solar zenith angle direction and the sum of solar zenith angle and observation zenith angle is about 106°.This research is of great significance to improve the contrast between the sea surface target and the solar flare background image and the target detection effect under the sea surface solar flare background.