1. A radar system configured to be implemented aboard a vehicle, the system comprising: a memory device operable to store radar-return data characterizing at least one geographic region, the data being received by an antenna coupled to the memory device; a database coupled to the memory device, the database including a set of chart data representing fixed landmarks associated with the at least one geographic region; and a processor coupled to the memory device, the processor configured to: obtain from the memory device multiple sets of the radar-return data corresponding to successive scans of the at least one geographic region, perform correlation processing among the multiple data sets to yield a first correlated data set, perform correlation processing between the first correlated data set and fixed-landmark chart data associated with the at least one geographic region to yield a second correlated data set, and process the second correlated data set to remove said fixed-landmark chart data therefrom and yield a third data set representing scanned objects that are not fixed landmarks.