Laser ranging data filtering method used for airborne photoelectric viewing system

The invention discloses a laser ranging data filtering method used for an airborne photoelectric viewing system. When a laser range finding machine of a photoelectric system carries out range findingon a ground target, a direction cosine of an optical axis of the laser range finding machine in an ENU geodetic coordinate system (an inertial system) is obtained through a coordinate transform on thebasis of the orientation, the high/low position, the roll attitude angle of an aerial carrier, the altitude of the aerial carrier, the ground altitude of a ground where the aerial carrier is locatedand the line of sight orientation/pitching angle of the photoelectric system, a distance value of the ground target relative to the aerial carrier is resolved in real time and is compared with a measurement value of the laser range finding machine, a measurement value of a laser is adopted to serve as effective data, is reported and is taken as the newest effective value if a difference is smallerthan a set threshold, and t