TABLE OF CONTENTS A number of additional applications, not covered by the categories of system described in the preceding sections, are discussed in the following section.
The principle of a moving-map display is based on terrain referenced navigation techniques and centres on the correlation of inertial positional and attitude data with digitised stored-map data. It is used as an aid to aircrew, being particularly valuable when flying in poor visibility or at night.
At the heart of this type of system is a mass data store, which may comprise the following:
the flight plan of the proposed route or mission, which would include waypoints, routeing and timing cues;
hazard data that may include potential constraints or intelligence information for military applications, which could incorporate data about locations of known missile sites, current battle areas, as well information about obstructions, such as pylons, chimneys and masts;
cultural and environmental data, including diurnal information, which would include location of bridges, railways, rivers and roads;
elevation profile data.
The flow of information in the database for this system is illustrated in Figure 15.31.
The other vital element of this navigation aid is the IN system, which normally includes aiding of the vertical channel with a barometer, and a precision altimeter. This type of system enables a measurement to be made of the aircraft height above the ground, thus creating a profile of the terrain below. The profile is formed by...
