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The main role of cooperative targets in satellite operations is to assist in updating relative position and velocity. In satellite dynamics, understanding the precise positions and velocities of satellites is crucial for successful navigation, communication, and coordination of movements in space. Cooperative targets often involve satellites or ground stations that actively communicate their positional data to other nearby satellites. This shared information allows for more accurate tracking and maneuvering, enhancing the overall effectiveness of satellite operations.

In differentiating from other functions mentioned in the options, asteroid tracking primarily focuses on celestial bodies, enhancing satellite power efficiency relates to optimizing energy consumption rather than positional data, and using decoys for defense purposes addresses military strategies, which is a different domain from the primary operational functions of cooperative satellite targets. Thus, ensuring accurate updates of relative positions and velocities is fundamental for the functionality of satellite systems, making option B the correct choice.