A GPS-based multi-baselines attitude determination system

which can be used for micro-satellite

is designed.The algorithm of multi-baselines attitude determination is studied.There are two steps in general.The one is to determine the integer ambiguity

and the other is to calculate the attitude matrix.The QR decomposition algorithm is used to establish the search space of integer ambiguity

while the QUSET algorithm is used to get the attitude matrix.The field tests are conducted and the results show that the performance of the system is good and on condition that baselines are 0.36 m

attitude angle may be computed in 30 s

computing accuracy of yaw angle may be 0.5 °.It can be used to determine the attitude of micro-satellite.