Abstract: The direct georeferencing method, based on airborne POS-supported system, provides mean square errors with the plane and elevation less than 10 and 15 cm respectively. However, to achieve such precision, the airborne data acquiring process has to meet a series of relatively strict standards. The tight coupling direct georeferencing method that based on virtual reference station and inertially-aided real time kinematic overcomes the restrictions on the flight conditions and the base station distance. Even in the case of satellite unlock, ground base station distance over 70 km and no base station, it can still obtain the results met the accuracy.This paper adopts the tight coupling direct georeferencing method to carry out the high-precision digital aerial remote sensing application in urban Shenyang city, Liaoning Province, China. Results show that the accuracy of the data obtained by the airborne POS based on tight coupling scheme is better than that of the loose combination.And the results obtained by the tight coupling precise point positioning solution can also meet the relevant standards.

Key words: airborne POS, tight coupling, INS-aided kinematic ambiguity resolution, virtual reference station