back beam

back beam

back beamclick for a larger image
A localizer with both front beam and back beam.
back beam
back beam
back beam
back beam
No change in back bearing in this case as the aircraft is flying directly south.
A reciprocal beam on the other side of a transmitter and on a reciprocal heading, as in an ILS (instrument landing system) localizer. Aircraft on a back beam may not have glide-path information.
back bearing
i. The horizontal angle, measured clock-wise from a datum, and observed from an aircraft for a point over which it has passed without an intervening alteration of a heading. It is the reciprocal of track.
ii. A bearing differing by 180°, or measured in the opposite direction from a given bearing. Also called a reciprocal bearing.
iii. The bearing at the opposite end of a line from the observer as measured from the true meridian at the opposite end of the line. The back bearing on all lines (other than north-south lines) differs from the bearing at the observer's station by the amount of convergency of the meridians between the two points.
References in periodicals archive ?
This watch had a leather band with white stitching and a few studs with both standard clock face and digital with back beam light in blue.
There was no shortage of lenders willing to back Beams, which is always a good early indicator of business success.
With the greatest weight component represented by the magnet pods, we tested a number of component concepts using a combination of pre-cut strong back beams and lock pins that literally let us build the Sea Patch on site," explained Palmer.