Vertical Path Guidance Computer

A low-cost airborne computer which provides a multiangular glide path for the landing problem is independent of ILS or GCA methods. A barometric altitude signal is divided by slant-range information from a DME interrogator. The resulting ground-based angle is subtracted from the selected approach angle to provide the displayed departure from the glide path. Angular and lineal outputs are available. DME station position may be electrically offset to serve all airdrome runways. Theoretical and experimental results are presented