Control of space station and its adjoint orbiter using relative DGPS

The control of space station and its adjoint orbiter is theoretically the control of relative motion of two or more space vehicles, including relative dynamics, relative kinematics, and relative attitude. Relative GPS can be used to navigating a vehicle in the vicinity of its target or destination. In this paper, GPS/DGPS are introduced and relative motion of space vehicles are modeled. Relative position, relative velocity and relative attitude are represented and solved by GPS/DGPS measurements. Use of some type of commercial GPS receiver onboard spacecraft and relative differential GPS technique, the relative attitude of space station and its adjoint satellite can be accurately calculated in real-time.