A method of operating a spectrum system includes issuing communicating transmitter commands to a spectrum operator system from the spectrum system. The spectrum operator system is in communication with a transmitter. The method also includes instructing, using a computing processor, the spectrum operator system to identify a set of wireless terminals associated with the transmitter, instruct the set of wireless terminals or a subset of the wireless terminals associated with the transmitter to return network measurements to the spectrum system, and instruct different subsets of wireless terminals associated with the transmitter over time to return network measurements to the spectrum system.