The invention relates to an autonomous
optical navigation method for soft landing of a deep
space probe, and belongs to the field of space flight and
aviation. The autonomous
optical navigation method comprises the following steps: firstly, reading a corresponding pixel and a pixel line coordinate of a target
landing point on an
image plane photographed by an
optical navigation camera, and the distance of the probe from a landing plane in three
laser ranging device mounting directions; secondly, determining the posture of the probe relative to a landing plane of a target astronomical body by using the obtained distance measured by the three
laser ranging devices and the mounting
azimuth angle and
pitch angle of the known
ranging device; thirdly, determining the position relationship between the probe and the target
landing point by using the obtained distance di measured by the three
laser ranging devices and the pixel and the pixel line coordinate of the target
landing point; and finally, performing filter
estimation on the position, speed, posture and angular speed information of the probe relative to the landing area. The autonomous optical navigation method for the soft landing of the deep
space probe has the characteristics of high reliability, low cost and strong real-time, and can highly precisely determine the position and posture of the probe relative to the target landing point.