초록

A landing approach system for aircraft utilizing ILS (instrument landing system) beam guidance information which converts angular glide slope information into linear altitude deviation relative to the glide slope beam center, using computed range information.

대표청구항 ▼

In an aircraft landing approach system utilizing ILS beam guidance information, a system for computing a signal representative of the altitude deviation of said aircraft from the ILS glide slope centerline comprising: means for estimating the initial slant range of the aircraft relative to the ILS g

In an aircraft landing approach system utilizing ILS beam guidance information, a system for computing a signal representative of the altitude deviation of said aircraft from the ILS glide slope centerline comprising: means for estimating the initial slant range of the aircraft relative to the ILS glide slope transmitter while approaching the glide slope centerline, from ground speed or airspeed, the angular slide slope deviation and sink rate; means for estimating the actual ground speed from sink rate and linear glide slope deviation; means for updating the slant range estimate utilizing said estimate of the ground speed; means for computing the linear deviation from the glide slope centerline from the angular glide slope deviation and the updated slant range estimate, and linear glide slope error feedback means for correcting errors in the range estimation computation.