Navigation informativity of geophysical fields in map-aided navigation

This paper deals with an analysis of the fields used in map-aided navigation. The variability of these fields plays the key role in the performance of map-aiding, thus the choice of an “appropriate” area of the field is prerequisite to accurate navigation. This choice can be made relying on a quantitative characteristic that determines the efficiency of using a geophysical field for navigation. We discuss known characteristics and observe the relationship between them. Furthermore, a technique for selecting appropriate areas is presented.