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Systems and methods for removing undesired signals in instrument landing systems

US7409272 - Aug 05, 2008

Passive gsm-based self-locating device

US7363043 - Apr 22, 2008

Satellite navigation receiver designed for compatibility with aircraft automatic landing systems

US6570531 - May 27, 2003

Far field monitor apparatus

US6348891 - Feb 19, 2002

Satellite landing system having instrument landing system look alike guidance

US6239745 - May 29, 2001

Aircraft surface navigation system

US5689273 - Nov 18, 1997

Operation verification system and method for navigational instruments

US5610600 - Mar 11, 1997

Ils signal analysis device and method

US5483245 - Jan 09, 1996

Instrument landing system calibrator

US5323332 - Jun 21, 1994

Navigation receiver with beam asymmetry immunity

US5177491 - Jan 05, 1993

Multi-mode microwave landing system

US4990921 - Feb 05, 1991

Scanning antenna having phase center diversity

US4811022 - Mar 07, 1989

Dynamic limiter for mls receiver

US4623892 - Nov 18, 1986

Digital modulation depth detector

US4609921 - Sep 02, 1986

Microprocessor controlled agc

US4499586 - Feb 12, 1985

Circuit for operating a flight navigation indicator

US4399425 - Aug 16, 1983

Aircraft autopilot system

US4330827 - May 18, 1982

Navigation unit having time shared operation

US4215346 - Jul 29, 1980

Time shared operation of navigational unit

US4184158 - Jan 15, 1980

Identification tone reconstitution in a time shared navigational receiver

US4184157 - Jan 15, 1980

Method and apparatus for determining when a glide slope signal exceeds a predetermined level

US4164340 - Aug 14, 1979

Aircraft landing systems

US4115777 - Sep 19, 1978

Aircraft landing aid for zero-zero visibility landings

US4101893 - Jul 18, 1978

Vertical glide slope control system including complementary filter

US3976267 - Aug 24, 1976

Low cost microwave receiver for ils

US3967278 - Jun 29, 1976

Doppler perspective navigation system employing the comparisons with a reference source of signal phases received on an aircraft by a plurality of sensors

US3952309 - Apr 20, 1976

Below glide slope advisory warning system for aircraft

US3947809 - Mar 30, 1976

Aircraft ground proximity warning instrument

US3946358 - Mar 23, 1976

Glide slope control signal processing system

US3944171 - Mar 16, 1976

Aircraft ground proximity warning instrument

US3936796 - Feb 03, 1976

Device for aircraft trajectory guidance

US3911436 - Oct 07, 1975

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Glide slope control (2)

Unit - time shared operation (2)