Root mean square diagram information filtering method

The invention discloses a root-mean-square graph information filtering method, solves the problems that the descending landing optical navigation method of a lunar probe is large in data volume and the validity of different detection characteristics is difficult to digitalize, and belongs to the field of descending landing optical navigation of the lunar probe. The method comprises the following steps: in the descending process of a detector, if the detector observes and identifies an annular mountain, updating a root-mean-square information matrix and a root-mean-square information vector by using a newly-added observed root-mean-square diagram information filtering model, determining that # imgabs0 # and # imgabs1 # do not observe a new annular mountain at a certain moment, and if the # imgabs0 # and # imgabs1 # do not observe a new annular mountain at a certain moment, determining that the new annular mountain is not observed at a certain moment; a root-mean-square information matrix and a root-mean-square