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7583225 Low earth orbit satellite data uplink  
A low earth orbit (LEO) satellite data uplink is provided. In one embodiment, a method of providing a data uplink to a LEO satellite includes determining position information using a LEO signal...
7576691 Apparatus and process for a global navigation satellite system meeting safety of life performance requirements  
A satellite system for providing a navigation service includes a ground segment and a user segment. The ground segment provides information to enable the user segment to autonomously determine the...
7554481 Localized jamming of navigation signals  
Various approaches to localized jamming of navigation signals are provided. In one embodiment, a navigation signal comprises at least a portion of a low earth orbit (LEO) signal provided by a LEO...
7486224 Microwave and millimeter frequency bistatic radar tracking and fire control system  
A bistatic passive radar system for tracking at least one target utilizing means for transmitting radar signals from at least one satellite platform in a geosynchronous orbit with the earth, means...
7372400 Methods and apparatus for a navigation system with reduced susceptibility to interference and jamming  
A navigation system provides a significant level of protection against all forms of interference or jamming to GPS in a cost-effective way. The system employs a network of ground reference stations...
7345652 Antenna system and RF signal interference abatement method  
Disclosed is an antenna system including a Luneberg Lens having a spherically shaped outer surface and a spherically shaped focal surface spaced from its outer surface with a plurality of patch...
7295633 Triple multiplexing spread spectrum receiver  
A GPS car navigation system derives GPS position update information from motion of the car along the actual track. Turns along the track are detected when they actually occur and are compared with...
7272401 Apparatus and method for determining position information of user equipment  
An apparatus for determining position information of one or more UEs (User Equipments), which includes a plurality of Node Bs for transmitting propagation signals to UEs positioned in a specific...
7042392 GPS access system and method  
This invention describes a means for acquiring GPS P/Y code under jamming conditions. It improves jam resistance by augmenting a component of the GPS signal with one from a different satellite...
6833813 Method, receiver and system for determining the time of reception of a beacon signal  
The invention relates to a method and to devices for determining in a positioning system the time of reception of a beacon signal which was received and tracked by a receiver. In order to enable a...
6816705 Satellite communication system and method  
A satellite communications system and method, where a satellite 10 can pass messages between a user terminal 44 and an earth station 38 , as the satellite moves in an orbit 12 12 ′ as...
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...
6683563 System for determining precise orbit of satellite and method thereof  
In a system for determining a precise orbit of a satellite, a satellite control system includes a tracking, telemetry and command module for receiving telemetry data from the satellite, tracking...
6680696 Positioning satellite system for measuring position of signal source  
A satellite system includes a signal source located on a surface of the earth, a surface of water, or in air; an orbiting satellite for measuring a position of the signal source, having a GPS...
6677893 Method and apparatus for locating the source of unknown signal  
A method of locating the source of an unknown signal of varying frequency received by receive antennas ( 16, 18 ) via relay satellites ( 12, 14 ) involves downconversion of received signals to a...
6658332 Anti-terrorism shipping control  
An anti-terrorist ship control system includes satellites that automatically take control of a waterborne vessel when the vessel's position or speed deviate from planned tracks or when the vessel...
6593877 Method for determining the position of a transmitting beacon  
A method of determining the position of a transmitting beacon transmitting a signal to certain satellites in a constellation of satellites, which satellites in turn retransmit retransmitted signals...
6549162 Method and apparatus for transmitting real time data from aircraft to ground stations using a data protocol over a satellite system  
Provided is a system and method for providing data originating from an aircraft to a ground-based device using a satellite communications link. The system includes an aircraft-based transceiver to...
6545998 Supplemental satellite communication processing  
Apparatus for enhancing the processing capabilities of a satellite communication system including an uplink receiver 40 deployable with a first satellite 20 . A first processor 50 deployable...
6393293 Method for rectangular parameterization of a geographic area using a geolocation algorithm  
A method ( 40 ) for parameterizing a predetermined geographic area ( 12 ) serviced by a satellite communication system ( 60 ) into a number of equally shaped sub-partitions ( 22 ) is discloseed....
6373431 Receiver for receiving radio waves from satellites  
In a position measuring receiver, when ephemeris data is acquired from radio waves received from satellites in the measurement of a present position of the receiver, the acquired ephemeris data and...
6373432 System using leo satellites for centimeter-level navigation  
Disclosed herein is a system for rapidly resolving position with centimeter-level accuracy for a mobile or stationary receiver [ 4]. This is achieved by estimating a set of parameters that are...
6369754 Fine positioning of a user terminal in a satellite communication system  
An improved method for determining the location of a user terminal with a high degree of accuracy. By repeating N times the basic active positioning measurement sets, a much better accuracy is...
6327534 Unambiguous position determination using two low-earth orbit satellites  
A system and method for unambiguously determining the position of a user terminal (for example, a mobile wireless telephone) in a low-Earth orbit satellite communications system. The system...
6285318 Micro-miniature beacon transmit-only geo-location emergency system for personal security  
Novel transmit-only geo-location techniques which can operate synergistically with existing or newly designed satellite or ground-based wireless communications networks using micro-miniature...
6272315 Mobile satellite system/terrestrial wireless system interworking techniques  
Methods for switching a mobile between operation in an mobile satellite system mode and a terrestrial wireless mode. When operating in the terrestrial wireless mode, the mobile terminal will...
6266585 Gyrocompassing by intermittent GPS interferometry  
6246363 Method and system for incorporating two-way ranging navigation as a calibration reference for GPS  
A method and system for using two-way ranging navigation to accurately determine the range along the path from source to destination by measuring the time delay during round-trip communication via...
6239721 Bootstrapped location determination  
A system for determining the location of a moving signal-receiving station, when the primary location determination (LD) signals become unavailable because the antenna is adjacent to or within a...
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,...
6219617 Method for determining the orbital positions of satellites in LEO networks  
In order to achieve a considerable reduction of the outlay required on the ground in connection with the accurate calculation of the exact orbital position of each individual satellite of a...
6195042 Method of locating a fixed terminal using a constellation of satellites  
A method of locating a fixed terminal of a telecommunication system comprising a constellation of satellites, a plurality of gateway stations and a plurality of fixed terminals includes "coarse",...
6181275 Positioning by computing pseudo-speeds in a satellite navigation system  
A method of locating a receiver in a navigation system comprising a constellation of satellites transmitting signals, includes the steps of: measuring pseudo-distances between the receiver and...
6169514 Low-power satellite-based geopositioning system  
A Low Earth Orbiting satellite system provides location and data communications services to mobile users equipped with a receiver/transmitter. The receiver/transmitter acts as a transponder that...
6166687 Method for determining position of mobile earth station in satellite communication system  
A method is disclosed for uniquely determining the position of a mobile earth station in a mobile satellite communication system which employs a non-geostationary satellite with a multi-spot beams....
6137441 Accurate range and range rate determination in a satellite communications system  
The present invention is a system and method for accurately determining the distance (range) between one or more satellites and a user terminal and the rate of change (range rate) of that distance....
6078284 Passive position determination using two low-earth orbit satellites  
A system and method for passively determining the position of a user terminal (for example, a mobile wireless telephone) in a low-Earth orbit satellite communications system. The system includes a...
6052561 Location method for a elective call receiver operating in a satellite communication system  
A selective call receiver (24) that receives signals transmitted by orbiting satellites (A, B) uses certain information transmitted by the satellites to calculate an estimate of its position. Using...
6049305 Compact antenna for low and medium earth orbit satellite communication systems  
A compact, low cost antenna communicates with low and medium earth orbit satellites. The antenna includes a plurality of micro-strip elements arranged about an axis and positioned to illuminate...
6031489 User terminal positioning system and method employing external signals  
A communications satellite communications system and method, where a communications satellite 10 can pass messages between a user terminal 44 and an earth station 38, as the communications...
6020847 Geolocation method and apparatus for satellite based telecommunications system  
A method for determining the geolocation of a user terminal within a telecommunications system having a constellation of satellites which relay communications signals between earth stations and...
5999127 Satellite communications facilitated by synchronized nodal regressions of low earth orbits  
A satellite communication method enables a low earth orbit data collecting mission satellite to conveniently achieve continuous, real time, and cost effective global connectivity by "plugging in"...
5990809 Underwater surveying system  
The hydrography of a land area beneath a shallow body of water is determined by driving a submersible, remotely controlled, powered vehicle along a route over the land area. The vehicle includes a...
5982323 Satellite navigation system  
The instant invention relates to a method for establishing a satellite navigation system, using the satellite networks provided for mobile communications, below the geostationary orbit, in...
5969674 Method and system for determining a position of a target vehicle utilizing two-way ranging  
A communication system transmitting messages includes two-way ranging by communicating between a target vehicle and a traffic controller station through a plurality of satellites. A set of the...
5944770 Method and receiver using a low earth orbiting satellite signal to augment the global positioning system  
A method and an apparatus using a low Earth orbiting (LEO) satellite signal to augment the Global Positioning System (GPS) for finding a location vector between a GPS user receiver and a GPS...
5878034 Spacecraft TDMA communications system with synchronization by spread spectrum overlay channel  
In a time division multiple access spacecraft communication system, each ground station determines when to send its information packets to arrive at the spacecraft at the beginning of a time slot....
5812961 Method and reciever using a low earth orbiting satellite signal to augment the global positioning system  
A method and an apparatus using a low Earth orbiting (LEO) satellite signal to augment the Global Positioning System (GPS) for finding a location vector between a GPS user receiver and a GPS...
5790073 Radio telecommunication network with fraud-circumventing registration  
A system (28) provides communication services to mobile units (24). Mobile units (24) perform a unit-based location process (46, 48) to determine their locations. The system (28) performs a...
5678174 Communication system which predicts good opportunities for communication  
A communication network (10) includes a number of satellites (12) traveling in low earth orbits (14). The satellites (12) broadcast data which identify particular cells (34) within which...
Matches 1 - 50 out of 60 1 2 >