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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 |
| 7337063 | Method and system for using database and GPS data to linearize VOR and ILS navigation data A method and system for determining a deviation of a vehicle from a desired course are described. The method includes receiving bearing signals from a transmitter, accessing a database, on the vehicle, to obtain transmitter position information identifying a positio... | 02/26/2008 |
| 7206675 | Runway approach using localizer alone This invention provides an improvement in the present instrument approach procedure used at airports having an ILS localizer without an accompanying UHF glide-slope. The field strength of the localizer, as measured at the airplane, is used as a basis for producing a... | 04/17/2007 |
| 7149648 | System and method for relative positioning of an autonomous vehicle Methods, systems, and articles of manufacture determine the position of a reference point relative to a vehicle. The reference point includes a transmitter operatively configured to transmit a first waveform and a second waveform having a relationship with the first... | 12/12/2006 |
| 7062364 | Electronic non-linear aircraft dynamic parameter display A method and apparatus is disclosed for displaying a dynamic parameter of an aircraft, the apparatus comprises a display unit receiving a display signal and displaying a scale that changes dynamically and non-linearly in accordance with a selected display algorithm,... | 06/13/2006 |
| 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 |
| 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 |
| 6239745 | Satellite landing system having instrument landing system look alike guidance Disclosed are a global navigation satellite system (GNSS) landing system (GLS) and methods of using the same to calculate a vertical deviation from the glide slope of the aircraft. A GNSS antenna and position determining circuitry are used to determine th... | 05/29/2001 |
| 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 |
| 5610600 | Operation verification system and method for navigational instruments An instrument verification system which causes the instrument needles to "bob" periodically--a sharp momentary deflection from center. If desired, the flags can also be "dipped" at the same time, verifying their operation as well. The pilot can easily dis... | 03/11/1997 |
| 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 |
| 5323332 | Instrument landing system calibrator The Instrument Landing System Calibrator employs a combined analog radio frequency downconverter with a digital control system for analysis of difference in depth of modulation of tones generated by an instrument landing system localizer and glide slope t... | 06/21/1994 |
| 5177491 | Navigation receiver with beam asymmetry immunity Airborne navigation receivers are designed to derive navigation information with accuracy immune to beam asymmetry errors. Scanned navigation beams of the Microwave Landing System are subject to asymmetry causing beam center measurement errors at power le... | 01/05/1993 |
| 4990921 | Multi-mode microwave landing system A guidance system for landing an aircraft is described which uses a source of signals identifiable with the aircraft and a ground station which is linked to the aircraft. Specifically, the ground station includes a receiver which is connected to one or mo... | 02/05/1991 |
| 4811022 | Scanning antenna having phase center diversity The object of this invention is to reduce the adverse effects of reflected electromagnetic radiation on the measurement threshold of a scanning beam. It has particular application to the time reference scanning beam of the international microwave landing ... | 03/07/1989 |
| 4623892 | Dynamic limiter for MLS receiver Received scanning signals radiated by a MLS ground system are used to determine and evaluate the approach angle of the aircraft. The difference between the angle for a particular scanning signal and the angle for a previous scanning signal is compared to ... | 11/18/1986 |
| 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 |
| 4499586 | Microprocessor controlled AGC A receiver for receiving recurring first and second scanning signals. The peak of successive first and second scanning signals is digitally detected and averaged. The gain of an amplifier of the receiver is controlled in response to the averaged peaks to ... | 02/12/1985 |
| 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 |
| 4330827 | Aircraft autopilot system In an aircraft autopilot there is provided a first circuit selectively actuatable to connect the glide slope adapter to electrical power during the existence of a glide deflection signal, the glide slope adapter being disconnected from electric power when... | 05/18/1982 |
| 4215346 | Navigation unit having time shared operation A navigational unit having a time-shared mode of operation for handling a plurality of different navigational signals is provided wherein IF components within the unit may have a dual dedication, i.e., used in common for handling all signals while normall... | 07/29/1980 |
| 4184158 | Time shared operation of navigational unit A general aviation navigational receiver is provided with a digital channel selection wherein a channel selection knob on the aircraft control board may be operated to control the functioning of a digitally implemented frequency synthesizer which in turn ... | 01/15/1980 |
| 4184157 | Identification tone reconstitution in a time shared navigational receiver In an information receiving apparatus having a time-shared mode of operation for simultaneously receiving a plurality of information carrying signals, at least one signal of which includes an identification tone superimposed thereupon, a tone reconstituti... | 01/15/1980 |
| 4164340 | Method and apparatus for determining when a glide slope signal exceeds a predetermined level The invention relates to a system utilizing an exponential control law for glide slope capture. The capture maneuver from above or below the beam, is a function of decreasing glide slope beam error. The present autopilot approach coupler is an altitude ra... | 08/14/1979 |
| 4115777 | Aircraft landing systems A dual I.L.S. glide slope system for allowing a normal 3° descent path plus an additional 6° descent path which can be used for noise abatement procedures etc. In accordance with the present invention these glide slopes are provided on a single assigned... | 09/19/1978 |
| 4101893 | Aircraft landing aid for zero-zero visibility landings An aircraft landing system which provides a pilot a perspective view of a nway on which he intends to land under zero visibility conditions. The system includes a multiplicity of microwave transmitters spaced at known intervals along both sides of a runwa... | 07/18/1978 |
| 3976267 | Vertical glide slope control system including complementary filter A vertical glide slope control system including a complementary filter. Complementary aircraft generated and processed signals are added to a glide slope error signal which may include distortions. The results of the summation are applied to a first order... | 08/24/1976 |
| 3967278 | Low cost microwave receiver for ILS In an instrument landing system (ILS), an aircraft is provided with apparatus for receiving from a ground-based transmitter overlapped modulated beam signals, which, when processed by the receiver, provide information about the position of the aircraft re... | 06/29/1976 |
| 3952309 | Doppler perspective navigation system employing the comparisons with a reference source of signal phases received on an aircraft by a plurality of sensors A perspective display of a runway is obtained on an aircraft by transmitting signals from selected marker positions about the runway. A plurality of sensors are positioned on the aircraft with each sensor being compared to a reference frequency. The compa... | 04/20/1976 |
| 3947809 | Below glide slope advisory warning system for aircraft For use in an aircraft warning system which measures the descent below a radio glideslope and compares it with the aircraft's altitude above ground to generate a warning when the descent below glideslope exceeds predefined limits for a particular altitude... | 03/30/1976 |
| 3946358 | Aircraft ground proximity warning instrument An aircraft instrument for warning the pilot that the aircraft is in an unsafe condition in proximity to the ground. The instrument has inputs representing aircraft configuration, flight condition with respect to the ground, and glide slope. Detector circ... | 03/23/1976 |
| 3944171 | Glide slope control signal processing system A rate-limited, signal magnitude limited, non-linearized lag circuit for processing glide slope error signals to reject noise and reduce aircraft response to hardover signals due to ground transmitter malfunctions or other anomalies. A feature of an embod... | 03/16/1976 |
| 3936796 | Aircraft ground proximity warning instrument An aircraft instrument for warning the pilot that the aircraft is in an unsafe condition in proximity to the ground. The instrument has inputs representing aircraft configuration, flight condition with respect to the ground, and glide slope. Detector circ... | 02/03/1976 |
