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Document Title |
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8855922 |
Managing use of location-identification services
In general, the subject matter described in this specification can be embodied in methods, systems, and program products for identifying a location of a mobile computing device. A first location... |
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8566022 |
Managing use of location-identification services
In general, the subject matter described in this specification can be embodied in methods, systems, and program products for identifying a location of a mobile computing device. A first location... |
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8159395 |
Communication device, communication system, position detection method and program
There is provided a communication device including: a receiving unit that receives radio signals transmitted from another communication device using a plurality of transmitting antennas by a... |
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6697630 |
Automatic location identification system comparing stored field strength data and an actual cellular call's field strength
An Automatic Location Identification (ALI) system for cellular telephone networks, along with a pseudo Automatic Number Identification (ANI) typically representing a particular face of a cell... |
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6097338 |
Instrument landing system glide path transmitter device
A glide path transmitter for an instrument landing system. The transmitter includes several antenna radiators by way of which high frequency signals containing various low frequency modulated... |
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5999129 |
Multiplatform ambiguous phase circle and TDOA protection emitter location
A method and system for determining the geolocation--i.e., the latitude, longitude, and altitude--of a stationary RF signal emitter from two or more moving observer aircraft. The observers receive... |
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5280295 |
Navigation and positioning system and method using uncoordinated beacon signals
A positioning system uses a multiplicity of commercial broadcast stereo FM radio signal transmitters, at known fixed locations, each of which transmits a beacon signal having a phase that is... |
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5173710 |
Navigation and positioning system and method using uncoordinated beacon signals
A positioning system uses a multiplicity of commercial broadcast stereo FM radio signal transmitters, at known fixed locations, each of which transmits a beacon signal having a phase that is... |
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4855962 |
Method and system for locating and correcting the orientation of an autonomous mobile object and a non-autonomous mobile object
In a method of locating and orienting a first direction linked to the position and to the orientation of an autonomous first mobile object (M), such as a ship towing a marine geophysical... |
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4797679 |
Radio direction-finding using time of arrival measurements
A method and a system for radio direction-finding by measuring the Time of Arrival (ToA) of the leading edge of signals from a distant source at two relatively closely spaced receiving elements.... |
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4739333 |
Single channel distance measuring receiver system and method
A distance-measuring receiver and system uses a transmitter which transmits only a single continuous-wave signal. The receiver produces a first component and a second component from the received... |
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4675684 |
Distance measuring receiver system and method
A distance measuring receiver system and method for determining the distance of a receiving station from a transmitting station, which provides the distance information by the reception and... |
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4672383 |
Craft guidance system
A craft guidance system 200 has signal transmission stations AB, CD, AC operable to provide three intersecting hyperbolic lattices 21, 20, 120. One transmission station pair AB provides a moving... |
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H000292 |
Apparatus for the detection of angles-of-arrival of radio frequency signals
Incoming radio frequency signals from one or more remote transmitters, that may be changing or "hopping" in frequency, are received at two closely spaced antennas. A pair of Chirp-Z transform... |
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4646096 |
Enhanced global positioning system Delta-Range processing
A circuit is shown which utilizes signals transmitted from global positioning system satellites to create change in phase signals. The change in phase signals are measured over a predetermined... |
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4626860 |
Passive synthetic aperture system for imaging a source of electromagnetic radiation
A vehicle-mounted passive synthetic aperture system for locating sources of electromagnetic radiation having a given wavelength λ. The system includes first and second receiving antennas, a phase... |
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4562437 |
Digital loop filter
A digital loop filter is used in a phase-tracking circuit which is adaptable to a phase-comparison radio navigation system such as the DECCA (registered trademark) system. The digital loop filter... |
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4547777 |
Method of radio-position-finding through determination of phases of electromagnetic waves and receiving device for practicing the method
A method of radio-position-finding by means of mapped contour lines of iso-phase shift between two radio-frequency waves separated by a low frequency and transmitted by a group of foci stations... |
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4532637 |
Differential receiver
A phase differential determining apparatus generates low frequency output signals from a multiple channel receiver and extracts relative phase angles of the received RF signals therefrom. The same... |
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4496951 |
Hyperbolic navigation receiver
A hyperbolic navigation receiver locates ships, and the like, by phase-locking the output signal of the voltage-controlled oscillator or voltage-controlled phase shifter of respectively provided... |
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4490722 |
Radio navigation system
An improved line-of-position radio navigation system is disclosed wherein a continuous wave signal produced by a local oscillator is transmitted from a fixed station. At a remote mobile station,... |
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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... |
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4442432 |
Electronic navigation method and system
A method and system for navigation is disclosed comprising a plurality of transmitters, pairs of which are excited from a common frequency source, and a receiver responsive to and deployed within... |
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4387375 |
Transmitter for a navigation system
In navigation transmitters it is important that the phase difference between the carrier waves of a carrier signal and the carrier waves of sideband signals be held at a constant value. To... |
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4307401 |
Two-channel receiver-indicator for phase radio systems
Two of three receivers of a receiver-indicator are tuned to the frequencies of a first guided station and first guiding station, second guided station and second guiding station, respectively, and... |
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4114155 |
Position determining apparatus and method
The position of a receiver responsive to C/A signals derived from multiple, orbiting space crafts is determined to an accuracy of greater than 300 meters. Each of the C/A signals has the same... |
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4106022 |
Radio position-determining system
A relay system for relaying hyperbolic navigation signal information received at a mobile. The mobile has a simple relay transmitter and receives signals which are radiated from different... |
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4063244 |
Receiver/timing apparatus for a single frequency, time-shared positioning system
An improved receiver/timing apparatus is disclosed for use in a single frequency, time-shared, continuous wave, phase-comparison positioning system wherein a trigger signal is transmitted from a... |
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3983559 |
Novel structure for radio position fixing using hyperbolic phase measurement
A radio position-fixing system using hyperbolic phase measurement, includ two transmitting stations which radiate a specific, programmed, sequential and recurrent waveform and a movable receiver... |
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3968493 |
Digital phase comparators
In a phase comparison radio navigation system in which phase-locked signals of the same frequency are radiated in succession from spaced stations and are compared in phase at a receiver, instead... |
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3967277 |
Radio navigation system
A radio navigation system is disclosed which includes a first pair of fixed transmitting stations, a second pair of fixed transmitting stations and a mobile station. The mobile station includes a... |
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3936827 |
Secure hyperbolic guidance using noise signals and correlation detection
A method for use in controlling the flight of an aircraft which includes radiating from two base stations respectively a first noise signal and a second noise signal identical to said first noise... |
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3936828 |
VLF navigation system
A VLF navigation system suitable for highly accurate worldwide aircraft navigation utilizing existing VLF transmitting stations on a "dead reckoning" basis with initial and intermediate fixes. The... |
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3899740 |
FM Sidetone phase comparison system
A phase determining system particularly suitable for accurate phase determination in a multipath signal environment such as a city wherein gross frequency disturbances are present during deep... |
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3889264 |
Vehicle locating system utilizing AM broadcasting station carriers
A vehicle locating system is disclosed which uses the carrier signals of unsynchronized commercial AM broadcasting stations to form hyperbolic isophase grid lines. Each vehicle is equipped with a... |
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3808597 |
ISO-PHASE POSITION DETERMINING SYSTEM
The following specification discloses an iso-phase position determining system for locating the position of a mobile receiver with respect to three transmitters. The center transmitter frequency... |
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3789408 |
SYNCHRONOUS SYSTEM
Means for measuring time or phase differences between incoming segmented signals which includes the generation of a segmented reference signal having the same frequency of the incoming signals. A... |
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3787844 |
RADIO NAVIGATION SYSTEM
An improved iso-phase line-of-position navigation system for determining the position of a mobile station is disclosed which includes first and second transmitting base stations at respectively... |
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3760270 |
CIRCUIT ARRANGEMENTS FOR MEASURING THE INSTANTANEOUS PHASE DIFFERENCE BETWEEN TWO SIGNALS
A circuit arrangement for measuring the phase difference between a received radio signal pulse and a locally-generated reference pulse, particularly for use in a hyperbolic navigation system... |
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3714650 |
VEHICLE COMMAND AND CONTROL SYSTEM
A dual frequency ranging and communication system for communicating with and locating mobile vehicles in a multipath environment such as an urban center. This system functions in urban areas for... |
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3689926 |
RADIO DIRECTION-FINDING METHOD AND A DEVICE FOR IMPLEMENTING SAID METHOD
A method and apparatus for radio position-finding of the hyperbolic type toetermine the position of a vehicle including intersecting signals of a radio position-finding hyperbole of one family... |
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3665468 |
RADIO COMMUNICATION SYSTEM
A novel radio communication system is disclosed, the system having particular applicability and utility as a radio navigation aid. A transmitting means is utilized which, in the preferred... |
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3648034 |
NAVIGATIONAL APPARATUS
Navigational apparatus for use in a mobile craft comprises measuring means for providing electrical representations of two coordinates of the two position of the mobile craft relative to a... |
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3618099 |
MISS DISTANCE DETERMINING HYPERBOLIC SYSTEM
To determine continuously the minimum distance by which a first moving vehicle will travel past a second moving vehicle, there is transmitted from said second vehicle four frequencies, f 1, f 2, f... |
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3613095 |
METHOD OF AND APPARATUS FOR LOCATING A POSITION
A method of an apparatus for locating a position in which a plurality of frequency standard devices based on the action of the natural frequencies associated with transitions between energy states... |
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3573829 |
POSITION DETERMINING MOVING HYPERBOLIC SYSTEM
In order to determine relative position, three spaced antennas AT1, TT2, AT3, are coupled to a transmitter and respectively radiate f1, f2, and f3 to provide two sets of moving hyperbolic... |
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3535789 |
CHART POSITION INDICATING APPARATUS
1,162,316. Indicating apparatus. DECCA Ltd. March 28, 1968 [July 11, 1967], No.31899/67. Heading G1J. Chart position indicating apparatus for use with a radio navigation system adapted to provide,... |
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3536901 |
NAVIGATIONAL COMPUTING APPARATUS
Improvements in navigation computers, characterized by being prepared for use with a hyperbolic navigation system equipped with a master station and two or more corrected stations and for... |
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3445845 |
PHASE COMPARISON RADIO RECEIVER
1,183,480. Radio navigation. RYAN AERONAUTICAL CO. 28 Sept., 1967 [9 Aug., 1967], No. 44237/67. Heading H4D. Specification describes a hyperbolic navigation receiver of the OMEGA type. Four... |
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3440535 |
PHASE LOCKED LOOP SERVO SYSTEM FOR DIRECT MEASUREMENT OF RELATIVE PHASE
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