Low elevation guidance system

Details Low elevation guidance system Low elevation guidance system

G - Physics

01

S

343/11

G01S 1/54 (2006.01) G01S 1/04 (2006.01) G01S 1/58 (2006.01) G01S 1/66 (2006.01)

Patent

CA 1316239

ABSTRACT OF THE DISCLOSURE A guidance system for aircraft wherein a radio antenna (101) on the ground transmits a beam (102) that sweeps across an aircraft (105) and the aircraft receives the beam and utilizes its amplitude waveform (107) in determining the location of the aircraft from the station. At low elevation angles of the aircraft the portion of received waveform that includes significant amounts of signal reflected from the ground is used in only a preliminary manner. The more reliable, directly radiated, portions of the waveform are utilized to compute by least squares error, the median of a Gaussian beam shape. That median serves as an estimate of the time that the transmitting antenna was pointing directly at the aircraft.

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