Matches 101 - 150 out of 374 < 1 2 3 4 5 6 7 8 >
Match Document Document Title
6147640 Communications satellite interference location system  
A system and method for determining the location of a source of interference for a communications satellite. The system has an antenna array located on the earth facing panel of the communications...
6144334 Method and apparatus for calculating access between satellite constellations and ground targets  
Assessing performance of satellite constellations. For a given constellation of satellites, each having a given number of sensors, a method is disclosed for determining the times of access between...
6125135 System and method for demodulating global positioning system signals  
A GPS receiver uses the energy of the L1 and L2 GPS satellite signals to track the phase of the L1 and L2 P-code and the carrier phase of the L2 signal. The in-phase channel of the L1 signal, after...
6122596 Non-geostationary orbit satelite constellation for continuous preferential 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...
6112054 Satellite positioning method in a communication control system  
A satellite position/arrival-time calculating section calculates the arrival date and time at which a communication satellite is to arrive in a communicable area where the communication satellite...
6108593 Method and apparatus for estimating attitude sensor bias in a satellite  
A method and apparatus for estimating attitude sensor bias in a satellite system uses attitude sensors and a spacecraft control processor. Attitude sensors provide output signals, which may contain...
6104911 Communication system with satellite diversity and method of operation thereof  
A method and apparatus for providing an economically viable satellite communication system (100) for voice, data, and video using satellite diversity to augment capacity of the system, to mitigate...
6091529 Channel allocation method in connection with data transmissions in the optical frequency range  
The instant invention contains a method for establishing a channel grid for optical transmission channels, wherein an optical communication between arbitrary stations, but in particular satellite...
6082677 Satellite orbiting toward west in the equatorial plane and meteorological satellite system using the satellite  
Achieved herein is a satellite capable of readily obtaining in a short time span a continuous image of the whole earth by a single unit of the satellite alone, the westward equatorial satellite...
6075810 NRZ and biphase-L formatted hexaphase modulated GPS transmission method  
An NRZ and biphase-L formatted, three code hexaphase modulated GPS signal transmission communication method provides for the simultaneous modulation of the C/A code, the P(Y) code and a NEW code...
6061631 Hybrid approach for antenna baseline self-survey and line bias calibration using GPS carrier phase  
Methods for estimation of the relative locations (baseline vectors) of two or more GPS signal antennas relative to each other and for estimation of line biases associated with each signal...
6043776 Mobile satellite communication system  
A mobile satellite communication system including an artificial satellite which is situated in a satellite orbit and develops an active phased array antenna so as to accomplish a line to a...
6044323 Satellite based commercial and military intercity and intercontinental air traffic control  
A satellite-based air traffic control system utilizes global-coverage satellite communications network to provide voice and data communication between an air traffic control center and one or more...
6040798 Satellite radiodetermination  
A satellite radiodetermination system comprises global navigation service (GNSS) satellites 2 such as GPS satellites, which generate GNSS ranging signals R n , geostationary satellites 6 which...
6016117 Method for the efficient determination of GPS satellite orbital position  
A GPS navigation receiver which calculates the GPS satellites' positions by numerical integration. The GPS receiver of the present invention integrates over eccentric anomaly E as an independent...
6014109 Offset-antenna total station  
The present invention provides a method and apparatus for expediently determining the azimuthal orientation of a total station. In one embodiment, the present invention is comprised of a total...
6007027 Method and apparatus for early service using phased satellite depolyment  
A method (100) for providing continuous communication service from a partially populated satellite constellation includes deploying one or more phases of satellites to populate one or more sets of...
6009376 Technique for the use of GPS for high orbiting satellites  
The present invention is directed toward a navigation system and method for a high orbit spacecraft, which passively utilizes UHF signals carrying intersatellite ranging data transmitted by a...
6002359 Antenna system for satellite digital audio radio service (DARS) system  
A digital audio radio service (DARS) antenna system is provided. The DARS antenna system includes a broadcast antenna mounted on a spacecraft. The broadcast antenna includes a slotted waveguide...
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"...
5995040 Global space radiopositioning and radionavigation system, beacon and receiver used in this system  
This invention relates to a global system dedicated to radionavigation and radiopositioning and includes: a land segment comprising: a global network of ground beacons (RBS) emitting an...
5982811 Method for efficient sampling in a correlator  
A direct sequence spread spectrum receiver samples an incoming signal at a low non-integer sample rate relative to the input data rate. The sample rate is an integer rate relative to a defined data...
5977907 Method and system for antenna pattern synthesis based on geographical distribution of subscribers  
A method and system for antenna pattern synthesis based on geographical distribution of subscribers allows more efficient use of satellite power resources in order to provide communications...
5963166 Precise spacecraft camera image navigation and registration  
A precise, spacecraft camera image navigation and registration system and method wherein a computer 36 on-board the spacecraft and a ground system comprising at least two ground stations precisely...
5953384 Automatic measurement of GPS cable delay time  
A method and apparatus accurately synchronizes a communications equipment (101) to a precise 1 PPS signal (229) when the remote GPS equipment (112) and the communications equipment (101) are...
5949369 Portable satellite phone having directional antenna for direct link to satellite  
A portable satellite phone is integrated into a communication system. The portable satellite phone forms a highly directed beam toward a satellite and adaptively maintains a beam to track the...
5907578 Weighted carrier phase multipath reduction  
The effect of the multipath distortions on the carrier phase measurements is reduced by using the weighted correlation functions. The generators of both periodic and dynamic weighted functions are...
5903654 Method and apparatus for eliminating ionospheric delay error in global positioning system signals  
A method and apparatus for determining and removing the error in the SPS measurement of the Global Positioning System due to ionospheric delay. The disclosed technique utilizes semi-codeless...
5890090 Half-dead-reckoning capable GPS navigation receiver  
A half-dead reckoning satellite navigation receiver comprises a receiver for tracking and acquisition of two, three, four or more satellites and for computing navigation solutions from the...
5874913 Method and apparatus to compensate for Doppler frequency shifts in a satellite communication system  
In a satellite communication system (10, 30) with at least one ground based transmitter (12, 32), at least one ground based receiver (16, 36) and at least one communication satellite (14, 34), an...
5871181 Artificial satellite communication system  
A communication system including a constellation of a plurality of artificial satellites orbiting the Earth, each artificial satellite having communication apparatus providing communication with...
5861842 Spacecraft disciplined reference oscillator  
An earth orbit satellite control system which provides automatic, continuous correction of phase and frequency in order to maintain synchronization between the satellite and a Global Positioning...
5862495 Real time position correction to ground generated spacecraft ephemeris  
Real time correction to ground generated satellite ephemeris implements a reference trajectory management module (334), an error estimation module (336), an parameter calculation module (338) and a...
5854605 GPS receiver using data bit timing to achieve a fast time to first fix  
A GPS receiver and a method for improving time to first fix (TTFF). The GPS receiver includes an internal clock for maintaining an approximate clock time during a standby mode and a microprocessor...
5831572 Method and apparatus for measuring satellite attitude using GPS  
The apparatus has n non aligned antennas, where n is at least for receiving radio signals from a plurality of OPS satellites. Radio frequency signals received by the various antennas are processed...
5828335 Spacecraft communication channel power control system  
A control system for the uplink transmitter of a ground station communicating with a spacecraft includes an antenna located at the ground station, pointed toward the spacecraft for receiving...
5825326 Real-time high-accuracy determination of integer ambiguities in a kinematic GPS receiver  
A GPS system and method for real-time determination of integer ambiguities in a global positioning system (GPS) receiver and, more specifically, to a GPS system and method for determining integer...
5825887 Transmitting and receiving apparatus for full code correlation operation under encryption for satellite positioning system  
The transmitting and receiving apparatus and method for full code correlation operation under encryption for the Satellite Positioning System (SATPS) are disclosed. The apparatus includes a central...
5812084 Method for estimating the precise orientation of a satellite-borne phased array antenna and bearing of a remote receiver  
The precise three-axis attitude of a space-borne phases-array antenna is estimated based on the assumption that the array geometry, consisting of the number of radiating elements and their relative...
5798732 GPS receiver having a fast time to first fix  
A global positioning system (GPS) receiver and a method having a fast time to first fix (TTFF) using GPS signal Doppler frequency shifts for correcting the local clock time and using information...
5793813 Communication system employing space-based and terrestrial telecommunications equipment  
A communications system employing a telestation that uses a computer to provide command and data handling, a GPS receiver to provide position, time, and attitude information, and a transceiver to...
5786773 Local-area augmentation system for satellite navigation precision-approach system  
An aircraft local-area augmentation system that employs a differential global positioning system (GPS) to assist aircraft (102) landing is disclosed. One or more GPS ground stations (120), each...
5781155 Navigation wristwear  
A navigation wristwear device comprises a GPS receiver fully disposed in a wrist watch type housing. A transparent microwave patch antenna is patterned of indium-tin-oxide on sapphire in front of...
5777577 Satellite selection  
A device for selecting a primary satellite for a terminal (T) in a radiocommunication system having a number of moving satellites comprises measurement means for determining location information...
5771001 Personal alarm system  
A new Personal Alarm System for detecting whether a person is in an emergency situation by measuring blood pressure, pulse and temperature, and thereafter transmitting such information and location...
5760738 GPS overlay system for a geostationary satellite  
Whether or not a pseudo GPS signal is normally received is monitored from the data state in a reception unit. Then, at the stage when the pseudo GPS signal can be normally received, the satellite...
5736961 Dual Frequency global positioning system  
A global position system receiver recovers the L1 and L2 carriers, the C/A-code measurements and the L1 and L2 P-code measurements by (a) producing an estimate of the L1 carrier phase angle and...
5734348 Surveying system using GPS  
A survey system is provided having GPS receivers and using a global positioning system. A reference station main body is provided for surveying; and a plurality of GPS survey apparatuses are...
5732387 Method and apparatus for call establishment in a satellite communication system  
A subscriber unit (26) contains location data that expires after predetermined time periods that are based on the subscriber's mobility. When the location data has not expired, the subscriber unit...
5726659 Multipath calibration in GPS pseudorange measurements  
Novel techniques are disclosed for eliminating multipath errors, including mean bias errors, in pseudorange measurements made by conventional global positioning system receivers. By correlating the...
Matches 101 - 150 out of 374 < 1 2 3 4 5 6 7 8 >