Digital measurement technology is the basis to realize high quality and efficiency for aircraft automatic docking. iGPS

which has the advantages of multi-point measuring

large measuring volume and expansibility

can provide global and real-time position and attitude information of aircraft components

and has been the effective means for digital measuring and positioning of the aircraft components automatic docking. In order to solve problems when iGPS was introduced into the aircraft components docking process

the composition and working principle of iGPS-based aircraft components docking system was expatiated. Moreover

several key technologies of the system

such as real-time measuring

unifying coordinate system

pose alignment and trajectory planning

and their solving methods based on the existing algorithms were described. Finally

all the algorithms were proved to be reliable through the case of ARJ21 wing-fuselage docking in the assembly scene.