A terrain-referenced navigation system (600) for an aircraft comprises: a stored digital terrain map (606); a position calculation unit (608) arranged to calculate aircraft position relative to the stored digital terrain map (606) to determine a terrain-referenced aircraft position; a fall line calculation unit (612) arranged to calculate a fall line for a projectile starting from the terrain-referenced aircraft position as a launch point; and an impact point calculation unit (614) arranged to directly compare the fall line with the digital terrain map, by incrementally comparing a height of the projectile along the fall line with a height of the terrain according to the stored digital terrain map (606) in order to find an expected impact point on the terrain.
PROJECTILE RANGING WITH DIGITAL MAP
ENTFERNUNGSMESSUNG EINES GESCHOSSES MIT DIGITALER KARTE
TÉLÉMÉTRIE DE PROJECTILE DOTÉE D'UNE CARTE NUMÉRIQUE
2021-08-11
Patent
Electronic Resource
English