Matches 201 - 250 out of 374 < 1 2 3 4 5 6 7 8 >
Match Document Document Title
5541606 W-code enhanced cross correlation satellite positioning system receiver  
The present invention relates to the new W code enhanced GPS receiver which allows to receive and demodulate the L1 and L2 satellite signals encrypted with the unknown Y code. No assumptions are...
5537679 Communication network with flexible handoff scheduling for mobile nodes  
A communication network (10) includes a constellation (12) of mobile satellites (14) in low earth orbits and stationary gateways (24) near the surface of the earth. Data packets are routed through...
5535237 Method and system for a multi channel and search global position system signal processor  
There is disclosed a multi channel GPS digital signal processor on a single IC. Each channel contains circuitry to process L1 or L2 P(Y) and C/A-code signals. In addition a search processor is...
5519404 Method of allocating a communication channel in a satellite network  
The invention concerns a method of allocating a respective free radio beam channel to calling and called stations of a satellite telecommunication network. If there is no free channel on a beam...
5519403 Global positioning system communications multi-interface  
A Global Positioning System (GPS) communications includes a GPS receiver for generating position information, a processor coupled to the GPS receiver by a bus, and a communications multi-interface...
5515062 Location system and method with acquisition of accurate location parameters  
A location system relies upon a non-coherent, FDM/TDM communication scheme to measure location parameters. A locator unit moves relative to the locatable unit. A series of messages are communicated...
5510797 Provision of SPS timing signals  
Methods for provision of a sequence of timing signals for one or a plurality of microprocessors, microprocessor peripheral devices or other timing-controlled instruments ("users"), using timing...
5502446 GPS-based automatic target reporting and finding network and components  
A GPS emergency rescue network comprising at least one GPS receiver and L2-frequency transmitter combination for a target, and a GPS receiver able to tune the L2 frequency transmissions of the...
5467282 GPS and satellite navigation system  
A satellite-based navigation system providing improved accuracy and reliability over wide geographical areas, including remote regions, is disclosed. Ranging-type signals transmitted through two or...
5463400 Method and apparatus for synchronizing to a multi-beam satellite TDMA communication system  
In a satellite based cellular communication system where the satellites move with respect to the surface of the Earth and have antenna patterns covering thousands of miles, subscriber units must...
5457464 Tracking system  
A tracking system for enabling maintenance of alignment between a receiver of electro-magnetic radiation and a source of electro-magnetic radiation signals, the system comprising: a receiver; a...
5451964 Method and system for resolving double difference GPS carrier phase integer ambiguity utilizing decentralized Kalman filters  
A method and system for accurately determining the position coordinates of a mobile GPS receiver by resolving the double difference GPS carrier phase integer ambiguity. A reference station is...
5446465 Satellite location and pointing system for use with global positioning system  
A system for determining location and pointing angle to a selected one of a first series of orbiting satellites as provided, wherein information relating to the system and desired satellite, is...
5440313 GPS synchronized frequency/time source  
A GPS-based frequency/time source of the present invention provides an accurate, traceable low cost reference. In particular, the GPS-based frequency/time source includes a GPS receiver, a variable...
5440491 Pseudo GPS signal transmitting system in a base station  
The object of this invention is to prevent GPS time monitor errors from effecting the distance-measuring accuracy. To achieve the object, a monitor GPS receiver receives GPS signals from each GPS...
5432521 Satellite receiver system having doppler frequency shift tracking  
A satellite receiver system provides acquisition and frequency tracking of a Doppler-shifted radio signal received from an orbiting satellite. The satellite receiver system includes a Costas...
5414431 Satellite communication system  
A satellite communication system in which a satellite receives a signal on a uplink carrier frequency, frequency translates it, and transmits the signal at a downlink carrier frequency. The...
5408239 Method for setting search band widths of a GPS receiver  
In a GPS receiver which searches for a satellite radio wave over a predetermined search bandwidth while setting a search center frequency f s to a start point, an offset value of Δf osc of an...
5402442 Receiving device for receiving and demodulating spread spectrum-modulated GPS wave  
A receiving device for receiving spread spectrum-modulated GPS signal transmitted from GPS (Global Positioning System) satellites to the earth. Received GPS signals are converted into IF signals...
5392450 Satellite communications system  
A multiple channel demand assignment multiple access (DAMA) system is configured as a spoke-and-hub star network in which a satellite relays information between each of many small-aperture...
5379045 SATPS mapping with angle orientation calibrator  
Mobile system apparatus for accurately determining the location of a designated object, spaced apart from the apparatus, without having to approach the designated object. The invention uses a...
5367304 Communication system employing spectrum reuse on a spherical surface  
Orbiting satellites (12) project footprints (30) on the earth. Each footprint (30) is divided into cells (28). Footprints (30) of nearby satellites (12) overlap one another, and the overlap...
5365447 GPS and satelite navigation system  
A satellite-based navigation system providing improved accuracy and reliability over wide geographical areas, including remote regions, is disclosed. Ranging-type signals transmitted through two or...
5355138 Antenna beam coverage reconfiguration  
A earth station calling another station sends a link setting-up a request to a control station. The control station memorizes in a transformed reference system the contour of a global geographical...
5347285 Method and apparatus for tracking the position and velocity of airborne instrumentation  
A method and system for tracking the position of at least one moving object, such as, an airborne meteorological instrument from a ground processing station by intercepting wideband spread spectrum...
5347286 Automatic antenna pointing system based on global positioning system (GPS) attitude information  
An embodiment of the present invention is a system for automatically pointing a directional antenna. The system comprises two GPS antennas mounted at horizontally opposed extremities of the...
5343210 Satellite radionavigation receiver  
A receiver of satellite signals which features a reception chain coupled to a navigation processor. The reception chain is of a homodyne type and is formed by a single frequency-conversion stage...
5326054 Apogee at constant time-of-day equatorial (ACE) orbit  
A man-made satellite (1) traveling in an elliptical orbit. The orbit has five or six daily apogees, which are positioned above the same longitudes of the earth at substantially the same local...
5313215 Satellite identification and antenna alignment  
A satellite identification system for identifying a communications satellite from which a broadcast communication signal is being received by an antenna, wherein the communication signal includes...
5293170 Global positioning system receiver digital processing technique  
A Global Positioning System (GPS) commercial receiver is provided with a digital processor that can utilize to advantage P-code modulated L1 and L2 satellite signals which have been modulated with...
5289188 High resolution radar system for high speed and satellite vehicles  
A radar system mounted on a satellite is scanned to provide surveillance of large areas such as the oceans. The transmitter oscillator generates bursts in the frequency range from about 20-250...
5285208 Power management system for a worldwide multiple satellite communications system  
A power management system for a worldwide multiple satellite system having satellites positioned latitudinally in a polar orbiting constellation, each satellite having a plurality of antenna beams,...
5257029 Transmission power control method and apparatus in satellite communication  
Signals including two signals having levels different from each other are transmitted to the satellite, and the phase difference between the return signals of the two signals is measured....
5252982 Method of precise position determination  
The method of precise position determination, in particular for geodetic positioning by means of carrier-frequency phase-difference measurement on GPS satellites, uses a double difference (Δφ 12...
5248979 Dual function satellite imaging and communication system using solid state mass data storage  
The present invention discloses a dual function satellite imaging and communication system (10, 40, 50, 60) using a solid state mass data storage device (30) which generates and stores image data...
5233357 Surveying system including an electro-optic total station and a portable receiving apparatus comprising a satellite position-measuring system  
A terrestrial surveying system comprising an electro-optic total station (1) for combined measurement of angle and distance and a connection to data storage (11) or data processing devices (20),...
5227802 Satellite system cell management  
There is provided a method and means for controlling the amount of overlap and gaps in coverage of antenna pattern cells of a moving satellite communication system, by determining the relative...
5223843 High performance global positioning system receiver means and method  
A high performance global positioning system receiver including a first circuit section adapted for operative association with an antenna means and including components for receiving, amplifying,...
5216427 Land-mobile satellite communication system  
A satellite communications system includes an orbiting communications satellite for relaying communications to and from a plurality of ground stations, and a network management center for making...
5194871 System for simultaneously deriving position information from a plurality of satellite transmissions  
A method and a system are disclosed for measuring the baseline vector b between a pair of survey marks on the ground by radio interferometry using radio signals broadcast from the earth orbiting...
5191338 Wideband transmission-mode FET linearizer  
A FET is operated without source-to-drain bias, with the source-to-drain conductive path coupled in series with a transmission line. A gate-to-ground impedance is selected in conjunction with a...
5187805 Telemetry, tracking and control for satellite cellular communication systems  
A Telemetry, Tracking and Control (TT&C) system for a satellite cellular communication system utilizing one of the user voice/data communication channels to communicate TT&C data with a satellite...
5185761 GPS receiver  
A GPS receiver comprising a plurality of demodulators. A satellite transmission search range is divided into as many frequency ranges as the demodulators so that one demodulator is assigned to one...
5161248 Method of predicting cell-to-cell hand-offs for a satellite cellular communications system  
A method of predicting cell-to-cell hand-offs of mobile subscribers for a satellite cellular communications system. Each satellite of a constellation projects a number of beams or cells upon the...
5153599 Clock test apparatus for electronic device  
A clock test apparatus connected to a GPS receiver mounted in a moving body has a frequency counter which counts clocks output from a clock generator incorporated in the GPS receiver for a...
5153598 Global Positioning System telecommand link  
An improvement to the present system of Global Positioning System of satellites and ground stations, adding the capability of transmitting and receiving telecommand information, when required, to...
5148452 Global positioning system digital receiver  
A digital GPS (Global Positioning System) receiver for receiving a plurality of coded satellite signals. The plurality of satellite signals are transmitted by a corresponding plurality of...
5140694 Anti-intrusion defeator and locator for communication satellites  
The present invention relates to an economical yet effective technique for locating and defeating intentional or unintentional interfering signals transmitted to a commercial communications...
5128680 Modulated range tone system  
A range tone system for determining the range between a satellite or spacecraft and a ground station FM modulates one of a 3968 Hz, 283 Hz or 35 Hz range tone onto a 27.77 Khz range tone....
5105198 Method of determining a position using satellites  
A method of determining the position of an observation point on the earth using M satellites on geosynchronous orbits having predetermined orbit inclination angle such that N (<M) satellites are...
Matches 201 - 250 out of 374 < 1 2 3 4 5 6 7 8 >