This paper mainly researches the rendezvous control problem of swarm robots without velocity information. For
the two cases without a virtual leader and with a virtual leader, distributed predictors are designed and distributed control
algorithms are proposed with only position information measurement while the connectivity is preserved. Theory analysis
shows that the proposed control algorithms can keep the robot network connected, and the velocity of all robots can converge
to the same value and the position information can reach consensus. Finally, simulation experiments show the effectiveness
of the proposed distributed control algorithms