Horizon Line Stability Observations over the Sea

Abstract

Increasing the stability and reliability of navigation for mobile objects of different classes is becoming increasingly significant. Satellite navigation systems have a fundamental defect: a vulnerability to hacking and spoofing. Observation of the horizon line is significant for two applications. The first is stellar inertial navigation systems. In this case, the horizon line can be used for local vertical estimation. Errors in local vertical estimation directly affect coordinate errors. The second is correlation-extremal navigation based on the observed horizon line shape (when islands or continents are observed from aerial vehicles). In both cases, instability of the horizon line produces navigation errors. A measurement procedure for horizon line position estimation was proposed and realised. Around-the-clock horizon line shooting was undertaken in 2013. Processing of the results shows a horizon line direction instability of about 5–7 angular minutes during the day time.

Experimental research of precise terrain occlusion prediction algorithm based on image sequences of the Chang’E-4 lunar rover

“…Ahmad等 人 [14] 认为天际线提取是一种分类问题, 探讨了局部纹 理特征点提取算子的适用性. Grishin和Maslov [15] 干个天际线特征点A对应的像点a, 其像素坐标x, y. 通 过相机标定, 获得内方位元素(主距f, 像主点坐标x 0 ,…”