  This paper addresses the problem of distributed coordination control of
spacecraft formation. It is assumed that the agents measure relative positions
of each other with a non-zero, unknown constant sensor bias. The translational
dynamics of the spacecraft is expressed in Euler-Lagrangian form. We propose a
novel distributed, model independent control law for synchronization of
networked Euler Lagrange system with biased measurements. An adaptive control
law is derived based on Lyapunov analysis to estimate the bias. The proposed
algorithm ensures that the velocities converge to that of leader exponentially
while the positions converge to a bounded neighborhood of the leader positions.
We have assumed a connected leader-follower network of spacecraft. Simulation
results on a six spacecraft formation corroborate our theoretical findings.
