Compatibility and the frequency selection problem

An automated model that calculates the frequency separation requirements for interference-free operation of electronic systems located in a given environment is described. The model assigns a channel to each system in the environment based on the frequencies available to each. The model calculates inter-system, antenna coupled interference levels only. It uses an iterative, but nonexhaustive, process which attempts to develop a compatible assignment. Preassignment checks are performed to determine if a complete assignment is impossible based on the number of frequencies available to each system and the separations between these frequencies. The results of a recent application of the model to an environment of microwave landing guidance systems including the proposed MLS is given.