The following is a U.K. Patent Application filed on June 18, 1958 by The English Electric Company Limited, Harold Aspden being one of the three co-inventors. It was published on March 17, 1962.
Commentary: This is a patent concerning navigational aids for use by a
pursuing fighter aircraft attacking a moving target. It concerns a radar display
with means for superimposing optically or electronically a reference grid
comprising a family of curves indicating precalculated optimum paths by which a
pursuing vehicle may achieve a predetermined position relative to the target
vehicle from a range of initial positions of the pursuing vehicle. The curves
indicate the bearing to be followed by the fighter in attacking the
target.