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6697730 |
Communications and computing based urban transit system
A communications and computing based urban transit system based on digital cellular communication, GPS locating technology, and digital computers to provide real-time command and control of...
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6695260 |
Virtually geostationary satellite array
An array of satellites virtual forming a geosynchronous space. Communication with the satellites is only carried out during an active arc near the apogee portion. During other points of the...
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6696942 |
Emergency warning network
An emergency warning network including a base station for broadcasting a warning signal and a first, earth-orbiting satellite for receiving the warning signal and rebroadcasting such to extend the...
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6690917 |
System and method for automatic determination of azimuthal and elevation direction of directional antennas and calibration thereof
A system and method for automatically directing a communication antenna to point to a desired wireless communication transceiver, is presented herein. The system includes a position location...
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6686880 |
Method and apparatus for prompting a reverse channel response from receiver in a digital broadcast system
The invention relates generally to a digital broadcast system and receivers therein which are configured to allow the use of a reverse channel for transmitting responses to broadcast messages. The...
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6684158 |
Method for aiding a global positioning system
A Search Domain Reducing Frequency Transfer in A Multi-Mode Global Positioning System Used With Wireless Networks is disclosed.
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6651000 |
Method and apparatus for generating and distributing satellite tracking information in a compact format
A method and apparatus for creating and distributing satellite tracking data in a compact format to a remote receiver. At least a portion of the satellite tracking data is extracted from memory and...
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6647270 |
Vehicletalk
A system for providing a communication link among a plurality of mobile units comprises a broadband RF transceiver with antenna, a GPS receiver, an audio-visual interface, an electro-mechanical...
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6643320 |
Receiver for DS-CDMA signals
A receiver for direct sequence spread spectrum code division multiple access signals (DS-CDMA) particularly for GPS signals includes a plurality of correlators. Each correlator includes variable...
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6611226 |
Satellite surveillance system and method
A radar surveillance system includes a plurality of satellites a plurality of medium earth orbit satellites to provide continuous, long dwell coverage of a region of interest. Each satellite has an...
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6611757 |
Global positioning system tag system
A system for determining the location of an object includes an interrogator remote from the object and a transponder located at the object. The interrogator receives GPS signals and transmits...
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6597989 |
Non-geostationary orbit satellite constellation for continuous coverage of northern latitudes
A non-geostationary low earth orbit satellite constellation using elliptical orbits with apogees in the Northern Hemisphere to provide continuous coverage over the Continental United States of...
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6594469 |
Methods and apparatus for broadcasting regional information over a satellite communication system
In a communication satellite constellation which uses CDMA and multiple spot beams for point-to-point communication, a system is provided for broadcasting regionally related information within a...
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6587669 |
Method and apparatus for controlling spot beam configurations for a communications satellite
A communications satellite method and are provided for controlling a configuration of spot beams produced by a communications satellite. A plurality of spot beams are generated by a communications...
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6573799 |
Clock system and corresponding method for providing a clock time accounting for systematic error
Method for accounting for factors (such as temperature) causing systematic errors (time-varying or constant) in a clock, such as a clock used in a ranging receiver (for use with a positioning...
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6553210 |
Single antenna for receipt of signals from multiple communications systems
A method and device for using a single antenna for simultaneously receiving radio frequency signals in a first radio frequency band and radio signals in a second radio frequency band different from...
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6515617 |
Method and system for position determination using geostationary earth orbit satellite
A system ( 20 ) and method ( 30 ) for estimating the location of a terrestrial-based user terminal ( 23 ) is provided. The user terminal ( 23 ) is capable of measuring the relative signal strengths...
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6499698 |
Satellite, satellite control method and satellite communication system
An information providing method and apparatus for providing information to a moving body via an artificial satellite. Information for selecting a desired information and position information of the...
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6501419 |
Sensor system and method for determining yaw orientation of a satellite
A first pair of antennas are mounted on a satellite spaced along a first axis and a second pair of antennas are spaced along a second axis for receiving signals from another satellite in orbit with...
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6501423 |
Method and system of directing an antenna in a two-way satellite system
A system for directing an antenna for transmission over a two-way satellite network is disclosed. A transceiver is coupled to the antenna; the transceiver transmits and receives signals over the...
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6477153 |
Method and apparatus for using the sidelobe of a long range antenna for a short range communication link
A communication satellite system ( 100 ) is established using one or more satellite constellations ( 110, 120 ). The two or more satellite groups ( 110, 120 ) are connected via long range...
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6470058 |
System for and method of jointly optimizing the transmit antenna patterns of two geostationary satellites in a satellite broadcasting system
A system for and method of providing optimizing the antenna patterns on a first satellite and a second satellite that operate in conjunction to deliver content to a single radio receiver. The...
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6463282 |
Non-uniform multi-beam satellite communications system and method
A satellite broadcast system and method, particularly useful for television signals, allows for local as well as nationwide broadcast service by allocating greater satellite resources to the more...
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6459898 |
Information traffic and performance monitoring for multi-beam satellites with on-board switching
In a satellite network with on-board switching and bandwidth on demand, traffic monitoring is required to facilitate billing data collection and to avoid congestion at the satellite. In addition to...
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6453150 |
Maximum-ratio synthetic transmission diversity device
Antenna elements 20 are arranged at intervals “d” greater than λ/2, e.g., 5λ. A signal received by an antenna element 20 is sent by way of an antenna multiplexer 21 to a receiver 23 ,...
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6452539 |
Apparatus and method for controlling radiation of electric waves
An electromagnetic wave radiation control apparatus includes an antenna, a modulator, an amplifier, and a radiation control unit. The modulator modulates a carrier wave based on a transmission...
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6452538 |
Satellite system for monitoring space
A low-cost satellite system and method for using it for continuously monitoring near space and providing real-time data, both astronomical and space-environmental, is described and claimed. Low...
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6449486 |
Multiple location estimates in a cellular communication system
Technique for determining the location of a mobile unit in a wireless communication system and presenting it to a remote party. In a scenario with first and second position estimates, the first...
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6424913 |
GPS navigational system and associated process for space applications
The invention provides GPS navigational system for a satellite in space which comprises a front end section having an input for receiving GPS signals from a plurality of satellites, a digital...
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6421000 |
GPS multipath mitigation using a multi-element antenna array
A method and apparatus for mitigating multipath signal distortion using a multi-element antenna array is provided. The multi-element antenna array is used to discriminate between the desired signal...
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6417799 |
Method of locating an interfering transmitter for a satellite telecommunications system
The invention relates to a method of locating a jammer ( 14 ) of a satellite telecommunications system ( 10 ). To locate the jammer, at least two of the following three measurements are performed: ...
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6408178 |
Systems and methods for resolving GPS pseudo-range ambiguity
Methods and systems are provided for determining a position of a mobile terminal that includes a satellite radiotelephone and a global positioning system (GPS) receiver based on knowledge of the...
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6400306 |
Multi-channel moving target radar detection and imaging apparatus and method
A radar detection and imaging system provides for the simultaneous imaging of the stationary objects on the earth's surface and the detection and imaging of moving targets. The radar system...
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6389409 |
Method for obtaining unified information graph from multiple information resources
A method for dynamically obtaining a unified classification information graph which provides a navigation system for a user to access sought information. The method includes providing a multiple...
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6370476 |
Interpolation of survey coordinate differences
A system for improving the accuracy of location coordinate determined in a survey of a chosen region. A grid of spaced apart points is imposed on the region, and a set of survey control points is...
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6362772 |
Transponder plot system and method
A system and method for providing remote viewing of satellite transponder plots. The system and method piovides for remote viewing of transponder plots derived from transponders located on a...
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6359584 |
Radar for space-borne use
Faraday Rotation causes rotation of the plane of polarization of plane polarised radiation emitted by a radar e.g. a synthetic aperture radar and, if returns polarized in orthogonal planes are...
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6341213 |
Dynamic repeater configuration for multilink satellite systems with robust subchannel interconnect capability
A dynamic repeater configuration for satellite systems is disclosed that allows for multiple broadcast of channel information and multiple subchannel allocations on uplink and downlink beam...
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6323817 |
Antenna cluster configuration for wide-angle coverage
A method and apparatus for producing contiguous spot beam communications coverage on the Earth's surface are disclosed. The apparatus comprises an antenna system including two wide scan antennas...
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6324586 |
System for synchronizing multiple computers with a common timing reference
A synchronized timing system is disclosed for one or more of a plurality of network interconnected computers. The system utilizes a global satellite system and includes a receiver device for...
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6323804 |
Method and apparatus for GPS time determination
A system for rapidly acquiring a time reference for the location determination of a wireless communication device. The system includes a wireless communication device (200), a GPS satellite (202)...
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6301231 |
Satellite communication system with variable rate satellite link diversity
A satellite communication system includes Earth-based terminal and a satellite constellation in non-geosynchronous Earth orbits. When two or more satellites are within range of a first Earth-based...
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6246360 |
Fast satellite-centric analytical algorithm for determining satellite coverage
The satellite coverage problem involves the determination of a given satellite's in-view and out-of-view times and durations for a given ground point. To perform global coverage, the planet is...
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6236361 |
Precision beacon tracking system
A system and method for eliminating pointing error in a beacon tracking system due to uncontrolled differences in passive loss or in amplification of the separate signals involved in creating a...
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6229477 |
Method and system for determining a position of a communication satellite utilizing two-way ranging
A method and system for determining a position of an orbiting transceiver in a communications network includes at least a first and second transceiver at a first and second known location,...
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6226494 |
System and method for intermittent satellite communication with a fixed antenna
A low-cost, low maintenance earth-based station is disclosed which includes a fixed aperture antenna directed to a fixed location. The system operates with a plurality of non-geosynchronous...
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6208296 |
Method and apparatus for training a receiver on a source
A method and apparatus for training a receiver on a source are provided. The receiver is an antenna and the source is a broadcast satellite. A first signal sensor receives at least one signal from...
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6201961 |
Use of reference phone in point-to-point satellite communication system
A local broadcast mode operation is implemented in a point-to-point satellite communications system (10) by utilizing a terrestrial reference terminal or phone (20) that is located within a desired...
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6182927 |
Medium earth orbit augmentation of a global positioning system for global navigation
A satellite navigation system and method for improving overall navigation accuracy when used in conjunction with the existing Global Positioning System. At least twelve satellites reside in a...
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6147641 |
Process for the autonomous reduction of acquisition and tracking thresholds of carriers received in orbit
The present invention relates to a process for the autonomous reduction of acquisition and tracking thresholds of carriers received in orbit by a receiver accessing an orbital navigator inside or...
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