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| Number | Title | Issue Date |
| 7409272 | Systems and methods for removing undesired signals in instrument landing systems A method of removing undesired signals in an aviation guidance system may include receiving at least one first desired signal having a first frequency of amplitude modulation, receiving at least one second desired signal having a second frequency of amplitude modula... | 08/05/2008 |
| 7315278 | Multiple frequency antenna structures and methods for receiving navigation or ranging signals In a local positioning system, augmentation of the land-based system is provided by receiving signals from a GNSS. The signals from the land-based positioning system have a code phase accuracy better than one wavelength of a carrier of the signals from the GNSS. Dif... | 01/01/2008 |
| 7237747 | Device for assisting an airplane in intercepting a segment of a flight path utilizing positional and ground speed indicators Device assisting with interception by an aircraft of a flight path segment located in a horizontal plane and a system of assistance with interception and follow-up of such a segment. The device includes means of determining a ground speed vector and means of display... | 07/03/2007 |
| 7062305 | Location identifying apparatus and method of identifying the location of a user In a survey system involving either differential global positioning (DGPS) or robotic total station (RTS) systems, the mobile station includes the radio system in the surveyor pole and either connects the laser reflector system or the GPS to the top of the pole or p... | 06/13/2006 |
| 7046170 | ANP/RNP display A graphical display or presentation of lateral ANP/RNP information for RNAV environments. The display may also be adapted to present aircraft data for monitoring the vertical flight performance of an aircraft under RVSM. ... | 05/16/2006 |
| 6931089 | Phase-locked loop with analog phase rotator A phase-locked loop includes a phase detector which receives an input signal and a first internal periodic signal and provides a phase signal indicative of a phase difference between the input signal and the internal signal. A rotator then receives the phase signal ... | 08/16/2005 |
| 6570531 | Satellite navigation receiver designed for compatibility with aircraft automatic landing systems A satellite navigational receiver landing system having retrofit compatibility with integrated landing system (ILS) receivers, in accordance with the invention, includes radio frequency circuitry which converts satellite signals into intermediate signals.... | 05/27/2003 |
| 6414632 | Monitoring of the phase angle of course and clearance signals in an instrument landing system A method for monitoring a localizer course facility in an instrument landing system, including modulating a course signal at a first signal frequency and at a second signal frequency, and transmitting the modulated course and clearance signals. The method... | 07/02/2002 |
| 6348891 | Far field monitor apparatus In a far field monitor apparatus, each of first and second ILS localizers includes a receiving antenna, a plurality of couplers, a combiner, a receiver, and a first detector. The receiving antenna is formed from a plurality of antenna elements symmetrical... | 02/19/2002 |
| 6111543 | Method and device for analysing radio navigation signals A beacon transmission signal comprises at least one carrier (C+SB) including sidebands (SB) and one sideband only signal (SBO), said carrier and said signal being in any mutual phase relationship. The method of the invention includes the steps of demodula... | 08/29/2000 |
| 5909193 | Digitally programmable radio modules for navigation systems A programmable digital radio is configured to perform navigation functions. A receiver in the programmable digital radio receives analog signals from a navigation unit and digitizes the analog signals to produce digital navigation signals. The digital nav... | 06/01/1999 |
| 5815538 | Method and apparatus for determining location of a subscriber device in a wireless cellular communications system The location of a subscriber device in a wireless cellular communications system is established by transmitting digital data signals to a cellular digital data receiver of the subscriber device from at least three different cellular cell site transmitters... | 09/29/1998 |
| 5689273 | Aircraft surface navigation system A surface guidance system for guiding aircraft equipped with Instrument Landing Systems along taxiways which utilizes two inductive loops (14,16) installed around the right half and the left half of the taxiways. Audio amplifiers (18,20) drive one loop (1... | 11/18/1997 |
| 5532701 | Arrangement for comparing two temporally separated bursts of signal at two different frequencies A comparator circuit compares two temporally separated input bursts of signals which occur at two different frequencies. The first burst is an interrogation pulse and the second burst is a reply pulse in a DME system. The comparator circuit includes a fir... | 07/02/1996 |
| 5483245 | ILS signal analysis device and method The invention relates to an instrument landing system (ILS) signal analysis device including an analog/digital converter receiving the composite signal to be analyzed and delivering a succession of values which can be processed in digital form, the signal... | 01/09/1996 |
| 5323165 | Two-frequency transmitting apparatus with tone-modulation phasing for an instrument landing system Two-frequency transmitting apparatus (S1, S2, LA) for instrument-landing systems is insensitive to so-called difference in depth of modulation (DDM) distortions caused by reflections of a clearance signal from obstacles (H) located near the runway (RW). T... | 06/21/1994 |
| 5216611 | Integrated enroute and approach guidance system for aircraft Data from long range aids such as the global positioning system (GPS) and an inertial navigation system (INS) and short range aids such as a microwave landing system (MLS) are used to smoothly and automatically transition an aircraft from the long range a... | 06/01/1993 |
| 5206654 | Passive aircraft monitoring system A passive aircraft monitoring system (20) receives signals transmitted by an instrument landing system (14, 16) and reflected from aircraft (18). The Doppler shift in the reflected signals is used to calculate the position or velocity of the aircraft. Usi... | 04/27/1993 |
| 5153587 | Monitor for instrument landing system Disclosed is an improvement to Integral Monitoring of two-frequency Instrument Landing System Localizer transmitting antenna arrays, by means of which the Clearance signal can be precisely separated from the combined Course and Clearance output of an Inte... | 10/06/1992 |
| 5101207 | MLS-type landing system with centralized means of surveillance It describes a Microwave Landing System wherein. The means for surveillance of the transmissions from the various MLS stations are centralized in a single central station which then commands the various MLS stations. The connection between the central station ... | 03/31/1992 |
| 5097266 | MLS-type landing system with centralized microwave generation The system comprises a central station assuring the generation of the microwave signals which must be transmitted by the different stations of an MLS. The signals thus generated in a centralized way are distributed to the different stations via an optical... | 03/17/1992 |
| 4912479 | Microwave landing system There is disclosed a microwave landing system wherein there are provided at least two means which are spaced by a predetermined distance and from two of which beams radiate alternately to scan a predetermined region vertically and horizontally. In the mic... | 03/27/1990 |
| 4912480 | Offset phase-center antenna for aircraft landing system An azimuthal scanning antenna for an aircraft landing system is formed of a set of vertically disposed columnar radiators arranged side-by-side in a horizontal array. The columnar radiators are tilted back in pitch 7.5°. Individual ones of the radiators ... | 03/27/1990 |
| 4907005 | Radiofrequency power distributor for instrument landing system localizer antenna arrays Disclosed is a radiofrequency distributor for a two frequency Instrument Landing System Localizer transmitting antenna array, for the purpose of driving each antenna with predetermined modulated radiofrequency currents of four different types, the distrib... | 03/06/1990 |
| 4866450 | Advanced instrument landing system A system for landing an aircraft is described, using a ground installation and an airborne installation which are synchronized together using GPS system time. Specifically, the ground installation includes a ground transmitter which radiates the sequence ... | 09/12/1989 |
| 4609921 | Digital modulation depth detector An improved system for digital analysis of a composite modulated signal to determine difference in depth of modulation is disclosed. The system is useful, for example, in developing deviation signals for use in an ILS autoland system.... | 09/02/1986 |
| 4605930 | Integral monitor for ILS localizer An improved integral monitor for the Instrument Landing System Localizer is disclosed, which uses resistive networks and transmission lines to generate analogs of radiated signal at three specified angles from runway centerline.... | 08/12/1986 |
| 4415899 | Monitor for an instrument-landing system A monitor located about 100 m from the ILS localizer determines whether the DDM alarm threshold was exceeded due to an equipment error or to an error caused by an overflying aircraft. To accomplish this, either the maximum of the frequency spectrum of the... | 11/15/1983 |
| 4415902 | Array for reducing the number of antenna elements for radiating instrument landing system localizer signals In an antenna array for radiating Instrument Landing System localizer signals, a method for reducing the required number of antenna elements by the combination of average element to element spacing exceeding one wavelength and end-fire directive antenna e... | 11/15/1983 |
| 4399425 | Circuit for operating a flight navigation indicator A circuit for use in aircraft navigation equipment includes operational amplifiers to drive a cockpit indicator such as an electric meter linearly over a first predetermined range, constantly over a second predetermined range, and out of view over a third... | 08/16/1983 |
| 4167735 | Aircraft orientation determining means A system for measuring, in conjunction with a GCA radar, the crab angle of n aircraft which is making its landing approach above a runway just prior to touch-down. Two doppler radars are placed, one on each side of the runway at equal spacings from the cen... | 09/11/1979 |
| 4107688 | Monitor for localizer antenna arrays Monitor comprises approximately matched means for sampling currents in the radiating elements. The sample currents are divided into three sets of parts. One set is used for monitoring course position, another set for monitoring course width and the third ... | 08/15/1978 |
| 4101892 | Localizer antenna array for use with localizer transmitters operating at one carrier frequency A broadband localizer antenna array with an even number of elements is supplied by a backmatched power dividing network comprising two chains of directional couplers and a group of hybrids which divide the power among the elements in accordance with geome... | 07/18/1978 |
| 4093952 | Guidance systems A guidance system for aircraft and ships, which system comprises at least two localizer antenna arrangements which are spaced in elevation above a reflecting surface, at least two distance measuring antenna arrangements which are spaced in elevation above... | 06/06/1978 |
| 4068236 | Monitor for two frequency localizer guidance system A monitoring arrangement for use in a two frequency localizer guidance system using a single antenna array is disclosed. This monitoring arrangement is designed to provide monitoring signals equivalent to those that would be provided by monitors located a... | 01/10/1978 |
| 4032920 | Two-frequency instrument landing system with integral monitor A two-frequency capture-effect instrument landing system employs a single localizer antenna array for both course-frequency and clearance-frequency radiation. The composite course and clearance signals are formed by networks that utilize trees of hybrid p... | 06/28/1977 |
| 4012739 | Instrument landing system (ILS) with simplified transmitter An ILS (Instrument Landing System) having at least one of the Glide-slope and Localizer functions, each of said functions comprising course and clearance signals. For the course and clearance signals of either function, a single transmitter is supplied, t... | 03/15/1977 |
| 3946387 | Method and apparatus for adjustment of modulation course patterns in a navigational system A method and apparatus for adjusting the modulation signal levels of overlapping beams which define along points of equal signal levels within the overlap a directional axis which in turn defines a desired navigation course for an airplane or similar mane... | 03/23/1976 |
