Window-passage detection system of an airplane

Details Window-passage detection system of an airplane Window-passage detection system of an airplane

1998-07-15

1999-09-21

Swarthout, Brent

Communications: electrical

Aircraft alarm or indicating systems

Land-based landing guidance

340952, 342 33, 342 35, 342357, 701 17, G08G 500

Patent

active

059559713

ABSTRACT:
A window-passage detection system has a ground system comprising: a first course generator (3) for generating a horizontal DDM (Differential Depth of Modulation) pattern for defining a horizontal width (25) of a virtual window frame by emitting a first carrier signal and a first side-band signal from a pair of first transmission antennae (6a and 6b), a second course generator (4) for generating a vertical DDM pattern for defining a vertical width (26) of the virtual window frame by emitting a second carrier signal and a second side-band signal from a pair of second transmission antennae (7a and 7b), and a third course generator (5) for generating a longitudinal DDM pattern for defining a longitudinal position (27) of the virtual window frame by emitting a third carrier signal and a third side-band signal from a pair of third transmission antenna (8a and 8b). Pairs of the first to the third transmission antennae (6a to 8b) generate three orthogonal polarization planes. With each pair of antenna, each carrier signal is emitted with the same phase and each side-band signal is emitted with inverted phase. Each carrier signal is amplitude-modulated with addition of a first and a second modulation signal, and each side-band signal is balanced-modulated with differential of the first and the second modulation signal.

REFERENCES:
patent: 4390949 (1983-06-01), Beningfield et al.
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patent: 5153587 (1992-10-01), Redlich
patent: 5361212 (1994-11-01), Class et al.
patent: 5546095 (1996-08-01), Lopez
patent: 5786773 (1998-07-01), Murphy
An Experiment of Approach and Landing According to DGPS; proceedings of 28th symposium of Electronic Navigation Research Institute, Ministry of Transport (1996); pp. 13-16--No Translation.

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