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| Number | Title | Issue Date |
| 7391369 | Method of and apparatus for eliminating quadrature-generated signals in magnetic cross-loop antennas A technique for reducing radio frequency signal navigation errors in systems such as Loran-C and the like, comprising the use of an orthogonally crossed pair of antenna windings on a ferrite cross, tuned to the carrier radio frequency to generate from the received s... | 06/24/2008 |
| 7358857 | Global positioning systems applications A global positioning system includes a fixed base unit of known position and at least one mobile unit, the base unit and the mobile unit each including a GPS receiver. This system further includes means for comparing the simultaneous GPS identified positions of the ... | 04/15/2008 |
| 7064705 | Method of and apparatus for increasing the peak output pulse power delivered by capacitor-driven high-power diode and square-loop saturable reactor pulse compression generators with the aid of minority carrier sweep-out circuits within the pulse compression circuit A technique and apparatus for increasing the peak output pulse power of a capacitor driven high-power diode and square-loop saturable reactor pulse compression generator or transmitter (such as a Loran-C transmitter or other high power pulse generator) with the aid ... | 06/20/2006 |
| 6928265 | METHOD OF AND APPARATUS FOR IMPLEMENTING HIGH SPEED DATA COMMUNICATION BY PHASE (FREQUENCY) MODULATION OF LORAN-C NAVIGATION SYSTEM USING SOLID-STATE PULSE TRANSMITTERS AND HIGH-POWER SOLID STATE SWITCHING FOR DYNAMIC ANTENNA TUNING A frequency-hopping intrapulse frequency modulation Loran-C navigation pulse technique, preferably using a flat-topped pulse shape and a novel 16-ary phase hopping scheme, and a novel improved high-power solid-state switch for dynamic antenna modulation tuning. ... | 08/09/2005 |
| 6452547 | METHOD OF AND APPARATUS FOR EXPANDING THE DIGITAL BIT RATE POTENTIAL FOR COMMUNICATION ADDED TO LORAN-C RADIO NAVIGATION PULSE TRAINS AND THE LIKE, WITHOUT AFFECTING THE NAVIGATION CAPABILITY AND INTEGRITY THEREOF A method and apparatus for increasing the potential digital bit data rate potential for communication-to-be-added to Loran-C radio-frequency pulse navigation transmitters and the like without affecting the navigation capability and integrity of the system... | 09/17/2002 |
| 6421628 | Signal handling device A signal handling device enables a data transmission between a plurality of position measuring devices and a master unit. The signal handling device includes a main communications port for communicating with a master unit via a data bus and a measurement ... | 07/16/2002 |
| 5323306 | Navigation system for converting bearing to waypoint data from a universal navigation system to signals usable by an omni bearing selector Apparatus is provided in an aircraft to convert signals from a Universal Navigation System such as LORAN to signals compatible with the standard Omni Bearing Selector (OBS) in the aircraft. The apparatus allows a visual bearing to any destination to be pr... | 06/21/1994 |
| 5245659 | Constant ratio coding for multipath rejection and ECCM enhancement A method is disclosed for encoding signals for transmission to provide signals which simultaneously have specifiable autocorrelation properties and low predictability. To enhance the accuracy of time of arrival measurements in the presence of either noise... | 09/14/1993 |
| 4893127 | Radar navigation system A low cost electronic navigation system including a Loran receiver and a marine radar unit adapted to receive vessel position information from the Loran. A computer within the radar unit uses successive Loran outputs to display vessel heading and the bear... | 01/09/1990 |
| 4792806 | Lightning position and tracking method A method for detecting lightning as an electrical atmospheric disturbance and for providing an indication of the geographic position of that disturbance includes the stationing of at least three receivers at known geographic locations in spaced relationsh... | 12/20/1988 |
| 4742357 | Stolen object location system A stolen object location system having a base station, a location network and an object unit which is associated with the object to be located. The location system is capable of operating in a plurality of different location modes ranging from simple tria... | 05/03/1988 |
| 4584580 | Apparatus for rejecting jamming waves A variable-narrow-band rejection filter is inserted in a reception signal path for rejecting a jamming wave. Signals at input and output terminals of the narrow-band rejection filter are picked up by a pair of first and second bandpass filters each having... | 04/22/1986 |
| 4543580 | System for lightning ground stroke position by time of arrival discrimination A lightning ground stroke location system employs a time-of-arrival discrimination scheme which uses, as its time synchronization base, the U.S. Coast Guard LORAN-C navigation network. The system comprises a plurality (at least three and preferably four) ... | 09/24/1985 |
| 4472720 | Area navigational system using geosynchronous satellites An area navigational system using geosynchronous satellites is disclosed. The navigational system comprises a master satellite and seven slave satellites uniformly disposed in geosynchronous orbit above the equator of the earth. The master satellite compr... | 09/18/1984 |
| 4438439 | Self-survey means A method and apparatus for a passive station to locate itself relative to a tationary or moving transmitting station transmitting a narrow pulsed scanning beam by utilizing reception of pulses directly from the transmitting station and reception of reflect... | 03/20/1984 |
| 4396918 | Low-frequency radio navigation system A method of CW navigation is provided using four transmitters (TR1-TR4) operating at sufficiently low frequencies to assure essentially pure groundwave operation. The transmitters are keyed to transmit constant bursts (1/4 sec) in a time-multiplexed patte... | 08/02/1983 |
| 4059801 | Apparatus for degrading Q in a high-Q RF pulse transmitting system and the like A high-Q, pulse transmitting antenna system is disclosed, as of the Loran type, wherein a simple solidstate circuit, employing mainly passive elements serves, during quiescent periods between transmissions, to introduce loss into the antenna circuit, ther... | 11/22/1977 |
| 4024383 | Method and system for navigation employing incremental range difference A navigation method and system suitable for highly accurate all-weather navigation of vehicles such as ships and aircraft. An initial position of the vehicle relative to a plurality of known points each located at predetermined geographic positions is fir... | 05/17/1977 |
| 4001598 | Sequential power supply and method for RF pulse generation This disclosure relates to the generation of RF pulses, generally in groups of pulses, through the use of a plurality of sequentially discharged power supplies, the successive discharge bursts of which are fed to a plurality of successive cycle-producing ... | 01/04/1977 |
| 3936762 | Digital phase-lock loop systems for phase processing of signals A digital phase-locked loop in which an error signal representing the difference between the phases of an input signal and an output signal is converted to a digital signal having a time-varying value. A programmable divider means is provided to produce a... | 02/03/1976 |
