ABSTRACT
Radio location is concerned with the use of radio waves for position sensing and locating objects. For this purpose, the radio signals can be used in an active or passive mode. In the passive mode, the characteristics of the radio signals received by a particular object situated in the field are used to determine the location. One of the most extensively employed technologies is radio navigation, which can be classified by its range, scope, error budget, and cost. In the active case, the signals generated by an object yield the information about its location. The range classifications can be identified to be short, medium, and long range, within which exact limits are rather indefinite. The scope classifications can be either self-contained or externally supported, or active or passive modes of operations.
