“…Consensus means that a team of subsystems reaches an agreement on a common value by interacting with their local neighbors. Due to its potential applications in several areas such as spacecraft formation flying, sensor networks, and cooperative surveillance (Ren, Beard, & Atkins, 2007), the consensus control problem has been addressed by many researchers from various perspectives; see Antonelli (2013), Guo and Dimarogonas (2013), Hong, Chen, and Bushnell (2008), Olfati-Saber and Murray (2004), Ren and Beard (2005), Ren et al (2007), Zhang, Lewis, and Qu (2012) and references therein. Existing consensus algorithms can be roughly categorized into two classes, namely, consensus without a leader (i.e., leaderless consensus) and consensus with a leader which is also called leader-follower consensus or distributed tracking.…”