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5726660 |
Personal data collection and reporting system
A personal data unit (PDU) is operable to collect video information via a camera (12) and audio information via a microphone (14). The PDU (10) utilizes a cellular link for transmission of the...
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5721555 |
Frequency spectral line tracking receiver
An improved navigation satellite receiver for tracking individual spread-spectrum frequency spectral lines with a microwave receiver antenna to receive signals from orbiting navigation satellites,...
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5721810 |
Method of automatically controlling and verifying telecommands in satellite control system
A method of automatically controlling and verifying telecommands in a satellite control system in which a satellite status analyzing/processing unit and a telecommand producing/executing unit are...
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5722042 |
Satellite communication system having double-layered earth orbit satellite constellation with two different altitudes
A satellite communication system has a double-layered earth orbit satellite constellation with a lower first orbit altitude and a higher second orbit altitude. In the satellite communication...
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5717404 |
Satellite ephemeris determination system using GPS tracking techniques
A system (10) for providing ephemeris data of a medium to high orbit satellite (12) relative to the Earth (30), where the satellite (12) is in an orbit substantially greater than 20,000 kilometers....
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5717403 |
Method and appartus for accurate frequency synthesis using global positioning system timing information
A method and apparatus for synthesizing a stable reference signal of a desired frequency within a spread spectrum receiver is disclosed herein. The spread spectrum receiver is designed for use in...
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5708439 |
Method and apparatus for observing unknown codes on satellite positioning system
The method and apparatus for observing unknown codes on the Satellite Positioning System satellites are disclosed. The technique employs the parabolic high gain antenna to determine the energy...
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5699069 |
Plural beam reduction of multipath reflections
A method and system provides for reduced interference from multipath reflections at the earth's surface during a communication between a vehicle traveling above the earth's surface and receivers at...
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5689271 |
Method and apparatus for civilian receiver operation with P(Y) code in satellite positioning system receiver
The system and method of allowing the civilian GPS receivers to utilize the satellite transmitted P(Y) code signal without requiring the detailed P(Y) code to be revealed inside the receiver are...
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5687084 |
Satellite orbit maintenance system
A technique for maintaining a satellite in an assigned orbit without control or intervention from the ground. Autonomously obtained navigational data provide a measurement of the actual orbit in...
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5686923 |
Multi-beam antenna for receiving microwaves emanating from several satellites
A multi-beam antenna for receiving microwaves emanating from at least first and second satellites comprising: a reflector which has a cylindro-paraboloidal shape (2) arranged substantially in the...
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5680240 |
High capacity communications satellite
A method for optically switching a signal in a two-way communication system using only one satellite includes the steps of receiving a first set of N beams, forming a first set of N optical...
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5668556 |
Low-orbit satellite communications system for terminals
The present invention relates to a communications system between low-orbit satellites and terminals, in which the beams (12) of each service area (14) are illuminated according to a beam-hopping...
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5666648 |
Polar relay system for satellite communication
One of the preferred embodiments of the present invention is a telecommunications system that includes twelve satellites (S) which are equally deployed in four polar low Earth orbits (OR). A...
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5663733 |
Digital bandwidth compression for optimum tracking in satellite positioning system receiver
The optimum design of the Satellite Positioning System Receiver is disclosed. The optimum design implementation of the receiver depends on the observed spectrum of the unknown W code of the...
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5659487 |
Method for recovering from sun transit in communication of very small aperture terminal
A method for recovering from a sun transit in a communication of a very small aperture terminal (VSAT) is disclosed, in which the sun transit outrage (STO) is prevented by using a sun transit...
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5652750 |
Optical satellite feeder links
A cellular communications satellite system is disclosed which comprises a plurality of ground-based base stations, mobile stations, and at least one orbiting satellite for relaying signals between...
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5650785 |
Low power GPS receiver
A low power GPS receiver, including an RF section to receive a GPS signal having information for determining a location fix and to issue an IF signal, a correlator system to correlate an internal...
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5641134 |
Satellite cellular telephone and data communication system at an inclined orbit
An improved satellite cellular telephone and data communication system facilitates dual satellite coverage over at least eighty-five percent of the earth. This improved system permits communication...
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5640166 |
Method for compensating for doppler frequency shifts for satellite communication systems
A satellite communication system (100) includes a satellite (102) in a predefined orbit projecting a plurality of beams (1-48) designating a coverage area (115). The satellite (102) has a...
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5629708 |
GPS receiver having an initial adjustment for correcting for drift in reference frequency
A GPS receiver having a rapid acquisition of a GPS satellite signal when a normal operational mode is entered after a low power standby mode. The GPS receiver includes an RF section for receiving...
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5627546 |
Combined ground and satellite system for global aircraft surveillance guidance and navigation
The present invention provides a combined ground and satellite system for global aircraft surveillance, navigation, landing guidance and collision avoidance which comprises a satellite subsystem...
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5625640 |
Apparatus for and method of broadcast satellite network return-link signal transmission
An apparatus and method for return-link transmission in direct broadcast satellite networks having a hub earth station transmitting forward-link signals, and a plurality of remote terminal stations...
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5625363 |
Paging/messaging system using GPS satellites
A paging/messaging system using the L3 transmission channel of a constellation of GPS satellites orbiting the earth, is comprised of an earth-based injection terminal having a source of...
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5625868 |
Method and apparatus for load sharing in a satellite communication system
In a satellite cellular communication system, subscriber traffic is shared between satellites whose antenna coverage patterns overlap during some portion of their orbit. When the power consumption...
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5621416 |
Optimized processing of signals for enhanced cross-correlation in a satellite positioning system receiver
The optimum SPS receiver is described that allows to optimize the demodulation of the unknown W-code generated by the Global Positioning System (GPS). The assumed timing and the spectrum structure...
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5619209 |
User paging for mobile satellite communications
A method of initiating communication between a ground station and a mobile handset through a satellite beam includes the steps of transmitting a forward signal indicative of a fixed geographic area...
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5619210 |
Large phased-array communications satellite
A communications satellite is disclosed which uses distributed multiplexing and demultiplexing so as to minimize the amount of cabling needed between deployable phased array panels and a central...
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5619211 |
Position locating and communication system using multiple satellite constellations
A communication and position locating system (2) suitable for air traffic control is described. Multiple satellites (40) are provided in two geosynchronous constellations. One constellation (e.g.,...
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5617100 |
Accurate position measuring system
An accurate position measuring system includes a communication satellite, a position measuring satellite, a position reference station, a network management station and a position measuring device....
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5612701 |
Adaptive beam pointing method and apparatus for a communication system
A method and apparatus for allocating service beams (72, 76) to communication units (80-84) (CUs) ascertains (124) the location of a CU (81) attempting to access the communication system (30), and...
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5610615 |
Method and device for mobile station positioning by means of a satellite, and associated transmission method
A positioning method for a mobile station in the radio coverage area of a satellite entails determining the instantaneous distance between the satellite and the mobile station. The instantaneous...
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5606551 |
Bidirectional mesh network
A communication network called a bidirectional mesh network (MSN), also called bi-MSN, is described. The bi-MSN includes a plurality of first communication loops (horizontal loops) each comprising...
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5602838 |
Global multi-satellite network
A global satellite communication network is described. The global satellite communication network comprises a plurality of polar communication loops and a plurality of longitudinal communication...
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5600328 |
Demodulator circuit in global positioning system receiver
A demodulator circuit in which N satellite signals included in N radio waves transferred from N satellites are detected by removing noise codes and carrier waves modulated by the satellite signals...
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5596328 |
Fail-safe/fail-operational differential GPS ground station system
A fail safe differential satellite positioning system ground station employing a plurality of processors to produce signals indicative of satellite-specific pseudo range errors and which includes...
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5594454 |
Global positioning system (GPS) linked satellite and missile communication systems
A small, multi-function device called the GPS/Telemetry Transmitter (GTT) that can recover telemetry (TM) data from missiles, spacecraft, balloons, or any moving platform or vehicle, and generate...
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5594453 |
GPS receiver having a rapid acquisition of GPS satellite signals
A GPS receiver having a rapid acquisition of a GPS satellite signal when a normal operational mode is entered after a low power standby mode. The GPS receiver includes an RF section for receiving...
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5592175 |
Location determination method and apparatus for a communication unit
In a communication system (10) having at least one communication unit (26) (CU) and at least one satellite (12, 170) which projects communication cells (176, 180) toward the CU (26), a method for...
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5576715 |
Method and apparatus for digital processing in a global positioning system receiver
A Global Positioning System (GPS) commercial receiver including a digital processor disposed to utilize the energy of both the L1 and L2 GPS satellite signals in order to derive an estimate of an...
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5574465 |
Portable Astronomic/meteoric observation system
A natural environment observation system has a GPS for detecting the present location (address), a calendar for providing the present date and time, a memory for storing natural phenomenon data,...
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5570096 |
Method and system for tracking satellites to locate unknown transmitting accurately
A satellite tracking system, including a terrestrial transmitter, a plurality of terrestrial receivers, and a controller/analyzer, operates in two modes. In an active mode, the transmitter emits a...
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5563880 |
Methods for managing and distributing payload instructions
These methods allow payload control instructions to be transported to satellites in a constellation of satellites and to be activated at pre-assigned times across the constellation. These methods...
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5563609 |
Antenna system with plural beam sequential offset
An array antenna system (40) has a plurality of radiators (44) for generating a set of beams (48), wherein axes of the beams are spaced apart from each other allowing the respective beams to...
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5563611 |
Method of and apparatus for integration of Loran-C and satellite navigation system (SNS) technologies for improved system accuracy, availability and integrity
A method of apparatus for integrating Loran-C and satellite navigation system technologies in a manner in which the Loran-C navigation signal transmissions are further modulated to provide a...
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5557284 |
Spoofing detection system for a satellite positioning system
A pair of antennae in combination with a GPS signal receiver system is employed for detecting the reception of satellite information signals from a spoofing signal transmitter as opposed to those...
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5553816 |
Satellite telecommunications and remote sensing system based on the use of short-period sun-synchronous elliptical orbits
A satellite telecommunications and remote sensing system including a plurality of satellites arranged above the Earth in short-period elliptical sun-synchronous orbits which have the following...
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5552920 |
Optically crosslinked communication system (OCCS)
An optically-based communication system hosted on an elevated platform (e.g., a satellite a tower, or other platform having a substantial vantage point) that uses multiple spatially diverse...
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5552794 |
Position estimation using satellite range rate measurements
A method for using a value of range rate observed by a receiver, such as a GPS receiver, to determine the coordinates of points on the surface of the earth from which this value of range rate would...
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5548293 |
System and method for generating attitude determinations using GPS
A GPS attitude receiver for determining the attitude of a moving vehicle in conjunction with a first, a second, a third, and a fourth antenna mounted to the moving vehicle. Each of the antennas...
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