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| Number | Title | Issue Date |
| 7978133 | GPS gyro calibration GPS gyro calibration methods and systems are described. In an embodiment, a ground station can receive antenna position data for a spot beam antenna from a global positioning system (GPS) platform where the antenna position data indicates a boresight direction of th... | 07/12/2011 |
| 7800536 | Signal acquisition/tracking method and correlator for the same A Doppler frequency searching method and correlator are disclosed. In the present invention, before Doppler frequency removal, a received signal is converted into digital form and the spreading code is removed. Then the signal is down-sampled to have a low sampling ... | 09/21/2010 |
| 7561103 | Method and device for generating a constant envelope navigation signal with four independent codes A method and a device for generating a modulated navigation signal which is intended to be used to position a downlink receiver. Four pseudorandom navigation codes of chip rhythms greater than 0.5 MHz are modulated onto a carrier of frequency greater than 500 MHz ac... | 07/14/2009 |
| 7548200 | Ephemeris extension method for GNSS applications Systems, methods and devices for improving the performance of Global Navigation Satellite System (GNSS) receivers are disclosed. In particular, the improvement of the ability to calculate a satellite position or a receiver position where a receiver has degraded abil... | 06/16/2009 |
| 7532161 | Method and apparatus for wide area augmentation system having L1/L5 bias estimation Methods and apparatus for receiving an estimate of L1 iono delay and L1 iono delay rate, receiving GEO slant ionospheric delay, receiving user iono vertical error information for a GEO satellite, and computing a L1/L5 bias estimate from the estimate of L1 iono delay... | 05/12/2009 |
| 7423585 | Navigation signal group delay calibration Navigation signal group delay calibration methods and systems are described. In an embodiment, a code signal generated in a navigation system platform can be measured where the code signal includes timing delay(s). An additional code signal generated in the navigati... | 09/09/2008 |
| 7415353 | Satellite-position table messaging A navigation satellite receiver accepts satellite-position table messages comprising truncated GPS ephemeris parameters. In particular, at least one of the two harmonic corrections to inclination angle, Cic and Cis, are not communicated and not used in the solution ... | 08/19/2008 |
| 7391363 | System and method for augmentation of satellite positioning systems A system and a method for augmentation of satellite positioning systems wherein a monitoring ground station (MGS) is connected to a computer center in charge of determining the level of error of a satellite (NS) broadcasting positioning signals, and transmitting nav... | 06/24/2008 |
| 7373250 | AGPS module time synchronization method and device using system time information in mobile terminal An Assisted Global Positioning System (AGPS) module time synchronization method and device using system time information in a mobile terminal that perform time synchronization using system frame information and a GPS module operation period in a process of searching... | 05/13/2008 |
| 7369084 | Two-sectional controlling method and device for satellite antenna A controlling device for a satellite antenna is provided. The controlling device includes a first signal generating device generating an inertial compensating signal having a compensating direction; a second signal generating device assembling a received signal from... | 05/06/2008 |
| 7369847 | Fixed cell communication system with reduced interference A communication system has a high altitude communication device that has an antenna for directing beams to a fixed cell pattern with a polarity of cells. A specific pattern of cells having the same communication resource is provided. Preferably, cells having the sam... | 05/06/2008 |
| 7366611 | System and method for detecting interference in global positioning satellite signals A system and method are provided for detecting local interference in GPS signals. A GPS receiver is capable of determining its GPS coordinates. A memory is capable of storing an initial location of the GPS receiver and a user-defined range of error. A processor is p... | 04/29/2008 |
| 7330789 | Apparatus and method for providing a telematics service having and AGPS function An apparatus for providing a telematics service including an AGPS function. An initial position measuring time of a telematics system is shortened due to the AGPS function of the telematics service, so the telematics service is rapidly provided to a user. Because th... | 02/12/2008 |
| 7321776 | Estimating GPS time at cellular terminals based on timing of information from base stations and satellites A mobile terminal generates an estimate of GPS time. The mobile terminal includes a cellular receiver, a GPS receiver, and a processor. The cellular receiver is configured to receive communication signals from cells in a wireless communication system. The GPS receiv... | 01/22/2008 |
| 7292848 | Method of activating an in-vehicle wireless communication device The invention provides a system and method for activating an in-vehicle wireless communication device. A mobile identification number associated with the wireless communication device is provided. A broadcast signal containing the mobile identification number and a ... | 11/06/2007 |
| 7286933 | GPS/dead-reckoning combination system and operating method thereof The present invention relates to a GPS/dead-reckoning combination system and an operation method of the same. The GPS/dead-reckoning combination system includes a GPS receiver that receives an absolute position data of a moving unit from a GPS; an inertia sensor tha... | 10/23/2007 |
| 7283090 | System for standard positioning service and precise positioning service cooperative operation A system for standard positioning service (SPS) and precise positioning service (PPS) cooperative operation is disclosed. In one embodiment, a PPS receiver is utilized to process a PPS data portion of a positioning signal. In addition, an SPS receiver is utilized to... | 10/16/2007 |
| 7277673 | Virtually geostationary satellite array with optimized parameters A plurality of satellites are placed into a virtually geosynchronous orbit, in which a first part of the orbit, that is near apogee, has a similar movement to the rotation of the earth, and therefore the orbit appears virtually stationary relative to the earth. Diff... | 10/02/2007 |
| 7274332 | Multiple evaluators for evaluation of a purality of conditions A system and method is disclosed for locating people or objects. In particular, a system and method for locating a wireless mobile station using a plurality of mobile station location estimators is disclosed. The system is useful for 911 emergency calls, tracking, r... | 09/25/2007 |
| 7256734 | Spot beam antenna boresight calibration using GPS receivers A method and apparatus for calibrating such a spot beam antenna by use of scanned spot beam signal characteristics measured by a plurality of ground based navigation receivers is disclosed. ... | 08/14/2007 |
| 7239273 | Apparatus and method for calculating satellite acquisition information to recognize position of mobile station An apparatus for calculating satellite acquisition information for controlling a position determination entity (PDE) to determine a position of the MS in a network assisted GPS system comprising an MS containing a GPS receiver and the PDE containing a reference stat... | 07/03/2007 |
| 7228230 | System for autonomous vehicle navigation with carrier phase DGPS and laser-scanner augmentation A horizontal navigation system aided by a carrier phase differential Global Positioning System (GPS) receiver and a Laser-Scanner (LS) for an Autonomous Ground Vehicle (AGV). The high accuracy vehicle navigation system is highly demanded for advanced AGVs. Although ... | 06/05/2007 |
| 7221317 | Space-based lever arm correction in navigational systems employing spot beams A method and apparatus for estimating a lever arm correction between the wide beam antenna and the spot beam antenna in a navigational satellite system is disclosed. A prescribed satellite maneuver is used to increase the accuracy of the predicted satellite attitude... | 05/22/2007 |
| 7221316 | Control segment-based lever-arm correction via curve fitting for high accuracy navigation A method and apparatus for estimating a lever arm correction between the wide beam antenna and the spot beam antenna in a navigational satellite system is disclosed. A prescribed satellite maneuver is used to increase the accuracy of the predicted satellite attitude... | 05/22/2007 |
| 7191636 | Inertial measurement system and method with sensor bias cancellation Inertial measurement system and method in which a base is rotated about an input axis in accordance with a rotation to be measured, rotation about the input axis is sensed with one or more angular rate sensors, fixed bias offset is cancelled by dithering the sensors... | 03/20/2007 |
| 7187322 | Radio navigation system using a constellation of positioning satellites with alternating transmission and analysis phases A positioning satellite for a constellation of satellites of a radio navigation satellite system includes transmitter adapted to transmit operational signals intended to enable the determination of positions of radio navigation receivers, receiver adapted to receive... | 03/06/2007 |
| 7161532 | Satellite navigation method A satellite navigation method determined the position of the receiver (1) by determining the signal travel time between the satellites (3, 4) and the receiver (1). Either the times of reception by the receiver (1) of the signals from the ... | 01/09/2007 |
| 7154439 | Communication satellite cellular coverage pointing correction using uplink beacon signal A communication satellite cellular coverage pointing correction using uplink beacon signal is provided. A ground-based beacon transmits a monopulse tracking signal or a Traveling Wave Coupler (TWC) tracking signal to a specialized tracking feed section located withi... | 12/26/2006 |
| 7151999 | Passive terrain navigation The present invention relates to terrain navigation wherein an earth-reflected satellite signal is received from at least one reference signal source whose position is known (120), for example a navigation satellite. Based on information contained in the rece... | 12/19/2006 |
| 7138942 | Process and apparatus for creation of estimated navigation signal error information A system for determining estimated navigation signal error information. Several error models are used by the evaluation unit, and, as a function of at least one defined selection standard, one of the several error models is selected. In determining the estimated nav... | 11/21/2006 |
| 7129889 | User segment-based lever arm correction via prescribed maneuver for high-accuracy navigation A method and apparatus for computing a lever arm correction between a wide beam coverage antenna and a steerable spot beam antenna of a navigational satellite is disclosed. A navigation receiver computes the lever arm correction using information from the navigation... | 10/31/2006 |
| 7110883 | Space based augmentation system with hierarchy for determining geographical corrections source Systems, devices and methods are provided for determining the appropriate or desired geographical correction source for SBAS corrections. One aspect provided herein is a method. According to one method embodiment, a Space Based Augmentation System (SBAS) correction ... | 09/19/2006 |
| 7065440 | Method and apparatus for steering movable object by using control algorithm that takes into account the difference between the nominal and optimum positions of navigation antenna A method of steering a vehicle along a predetermined, or real time path by using a steering control algorithm. The vehicle includes a navigation system and a navigation antenna. The navigation antenna is mounted on the vehicle at an optimum antenna position, whereas... | 06/20/2006 |
| 7053828 | Systems and methods for correcting thermal distortion pointing errors One embodiment of the present invention relates to a system for correcting spacecraft thermal distortion pointing errors. The system comprises one or more spacecraft sensors located at positions on a spacecraft and which are adapted to measure spacecraft parameters ... | 05/30/2006 |
| 7047029 | Adaptive transmission system A method, apparatus, article of manufacture, and a computer memory structure adaptively controlling a transmission signal from a satellite to at least one terrestrial receiver in a terrestrial region is disclosed. The method comprises the steps of receiving informat... | 05/16/2006 |
| 7043200 | Satellite uplink power control A method and system for Uplink Power Control in a satellite communication system comprising a geostationary satellite (2) communicating with a gateway station (3) applying the invention and at least two other gateway station (4) is described. Th... | 05/09/2006 |
| 7043265 | Providing time sychronization to a GPS locator A method and system for knowing positioning system standard time at a mobile unit with respect to a system, such as the Global Positioning System, when normal, direct measurement may be impracticable owing to low signal-to noise ratio, by calibrating the timing sign... | 05/09/2006 |
| 7031682 | Radio communication terminal and gain control circuit for the same A gain control circuit has a transmission power amplifier that amplifies a transmission signal to a predetermined level. An adjacent channel leak power ratio monitor finds a ratio of a distortion element corresponding to an adjacent channel leak power to a main elem... | 04/18/2006 |
| 7020555 | Subscription GPS information service system A GPS information service system for providing supplemental GPS correction and signal acquisition information to subscribers. A GPS information server broadcasts GPS aiding information encrypted with subscription keys. A remote GPS subscription unit receives the key... | 03/28/2006 |
| 6985812 | System and method for detecting interference in global positioning satellite signals A system and method are provided for detecting local interference in GPS signals. A GPS receiver is capable of determining its GPS coordinates. A memory is capable of storing an initial location of the GPS receiver and a user-defined range of error. A processor is p... | 01/10/2006 |
