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8179309 |
Method and apparatus for the optimization of status messages in a satellite navigation system
In a method for optimization of status messages in a satellite navigation system, which comprises a space segment having a plurality of satellites that emit navigation signals to be received and...
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8138971 |
Method and device method for detecting frequency jumps of a navigation satellite's master clock
A method for detecting frequency jumps of a navigation satellite's master clock, comprising the steps of i) monitoring the master clock signal that is generated by a master clock onboard of the...
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8072375 |
Method and apparatus for integrity communication in a navigation satellite system
For integrity communication, a navigation satellite system has a space segment with satellites that emit navigation signals for reception and analysis by user systems, and a ground segment with...
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8035555 |
Spreading codes for a satellite navigation system
One embodiment of the present invention provides a method of creating a set of spreading codes for use in a satellite navigation system comprising a constellation of satellites. Each satellite in...
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7994972 |
Method and apparatus for operating a navigation satellite system
A satellite navigation system generates a smooth and flexible parameterization of satellite orbits and/or clock corrections. The satellite orbit(s) and/or the satellite clock corrections, are...
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7852263 |
Method for transmitting satellite data
In a method for transmitting satellite data of a global navigation satellite system each satellite transmit position data of neighboring satellites to a navigation device on the earth. The subset...
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7595749 |
Method and device for relative time and position determination for moving objects based on one-way and two-way measurements
In a method for relative time and position determinations for moving objects of a constellation, signals by the objects are isochronously transmitted, with each object transmitting a unique signal...
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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...
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7561969 |
Navtex receiver
Upon receiving a NAVTEX broadcast signal, a NAVTEX receiver reconstructs text data, detects a special character string including numerals followed by “N” or “S” and numerals followed by “E” or ...
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7519456 |
Maintenance process and device for a radionavigation installation of an aircraft
Maintenance process and device for a radionavigation installation of an aircraft. The maintenance device (1) comprises a first means of recording (7) for recording on a first recording medium (8)...
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7505772 |
System and method for location-based user matching
A system for matching users of mobile communications devices comprising first and second first mobile communications devices for transmitting information defining a location of the first mobile...
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7460019 |
Personal locator system
A communications system for locating, tracking, and messaging between people, which preferably includes a satellite, global positioning satellites, ground monitoring units, and a...
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7430196 |
Transmission systems
A receiver comprising a processor having an input to receive a sequence of transmission frames conforming to a transmission protocol to represent payload data, a memory arranged to store and to...
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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...
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7366523 |
Method and system for providing location-based services
A resource request that is originated by a short-range wireless communications device originates a request. A location indicator is added to the resource request that identifies a location of the...
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7346797 |
Optimum stable composite clock network
An apparatus and method are disclosed or producing a network of composite clocks with optimized stability characteristics from individual clocks that are part of a network wherein not all clocks...
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7277713 |
Sender location identifier, method of identifying a sender location and communication system employing the same
The present invention provides a sender location identifier for use with a short message service (SMS). In one embodiment, the sender location identifier includes a memory configured to provide a...
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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.
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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...
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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...
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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...
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7184744 |
GPS enabled emergency messaging system
A GPS enabled Emergency Messaging System (GEMS) includes: Emergency Response Centers (ERC's) for defining emergency broadcast messages directed to specified geographic areas; a GPS Control Segment...
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7161533 |
Method and a system for positioning, and an electronic device
The present invention relates to a method for determining the position of an electronic device. The electronic device is used for receiving signals from satellites of a positioning system, and in...
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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...
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7120198 |
Quadrature product subcarrier modulation system
A coherent adaptive subcarrier modulation system applies subcarrier modulation to quadrature modulated signals with constant envelope modulation suitable for efficient sinewave and squarewave...
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7106863 |
Method for positioning by satellites
The invention relates to a security-protected system for positioning by satellites, comprising a constellation of satellites (11) sending out positioning signals under the control of a set of...
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7076365 |
Enhanced dead reckoning method
An enhanced dead reckoning method determines the position of a participating vehicle. The participating vehicle is unable to receive signals from global positioning satellites. The position is...
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7058507 |
Navigation system
A navigation system, which can determine a place suitable for meeting as a meeting place, is disclosed. This navigation system obtains positional information of mobile units, and extracts...
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7039387 |
Systems, methods and computer program products for responding to AMBER alerts
An AMBER alert gateway includes a central telephone number that is configured to receive telephone calls from individuals in response to potential sightings related to AMBER alerts. An interactive...
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7019687 |
Methods and apparatus for satellite integrity messaging
Methods and apparatus for providing integrity alert information include embedding the integrity alert message in a longer message stream that is broadcast to a receiver in order to meet a...
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6975923 |
Autonomous vehicle guidance on or near airports
A method for operating an autonomous vehicle at an airport comprises the steps of: receiving a set of general purpose navigation signals; receiving a supplementary set of navigation signals;...
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6958692 |
Personal organizer equipment
Location-dependant personal organizer apparatus for operation with a memory for storing a plurality of appointment entries, each appointment entry including data specifying a time and a place; the...
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6895249 |
Method and apparatus for broadcasting position location data in a wireless communication system
Techniques to efficiently broadcast position location data (PLD) from a base station to a number of terminals. In one aspect, PLD messages are classified into groups, and each group is broadcast in...
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6888495 |
Vehicle tracker with user notifications and associated methods
A tracking system includes a vehicle tracking unit and a monitoring station communicating therewith. The vehicle tracking unit preferably includes a vehicle position determining device, a wireless...
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6850187 |
Satellite integrity monitor and alert
The present invention is a system for providing GPS users with a high level of confidence in the integrity and accuracy of received GPS signals. The system provides a means for each GPS satellite...
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6847676 |
All-lag spread-spectrum correlators with rotating references
An all-lag rotating-reference correlator correlates a received spread-spectrum signal with a rotating reference code, and produces in each sampling instance N correlation lags corresponding to the...
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6836675 |
Method for aiming and adjusting microwave antenna during installation, and apparatus
The present invention disclosures a method for aiming antennas during the installation of microwave communication systems. By computerized link quality monitoring mechanism, the software of the...
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6826475 |
Car navigation unit
When in a guide route a vehicle has strayed from a route r1 before passing through an en-route stop W and has moved onto a route r2 selected to lead to a destination E after the en-route stop, if a...
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6691033 |
System and method for calibrating inter-star-tracker misalignments in a stellar inertial attitude determination system
A method and apparatus for determining star tracker misalignments is disclosed. The method comprises the steps of defining a defining a reference frame for the star tracker assembly according to a...
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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...
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6621453 |
Satellite attitude adjustment for GPS initialization
By using the GPS satellite transmitted signals that are tracked on a satellite and those that should be tracked but are not due to the attitude of the satellite and rotating the satellite, two...
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6552648 |
Method for protecting hire vehicles against unauthorized use
In a method of protecting against unauthorized use of a vehicle having a communication structure for exchange of data between a receiving unit, a use protection and control unit and at least one...
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6549165 |
Ocean altimetry interferometric method and device using GNSS signals
A method for performing Earth altimetry comprising the steps of: receiving by an upward-looking antenna onboard a platform above the Earth surface, direct signals having at least two different...
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6522267 |
Vehicle tracker conserving codes and related methods
A vehicle tracking system includes a vehicle tracking unit and a monitoring station communicating therewith. The vehicle tracking unit may include a vehicle position determining device, a wireless...
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6473033 |
Integrated pseudolite/satellite base station transmitter
An integrated split-spectrum pseudolite/satellite base station (SS-PL)/SBS transmitter comprising a satellite base station and a split-spectrum pseudolite (SS-PL) transmitter co-located with the...
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6462707 |
Satellite position monitor
The present invention is a system for providing GPS users with a high level of confidence in the integrity and accuracy of received GPS signals. A first GPS satellite broadcasts a GPS navigation...
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6363323 |
Apparatus and method for monitoring travel of a mobile vehicle
A vehicle tracking system includes a sensor (e.g., a GPS sensor) and a vehicle control unit (VCU) attached to a vehicle. The sensor determines the vehicle's location based on positioning signals...
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6363320 |
Thin-client real-time interpretive object tracking system
A system for tracking objects includes a database for storing reference data as line segments corresponding to coordinate locations along environmental reference features; mobile units for...
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6335951 |
Programmable waveform generator for a global positioning system
A method for generating a global positioning signal from a space based craft including the steps of generating a plurality of binary modulating signals using a waveform generator; separately...
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6307861 |
Method and system for multicast using a satellite network
A multicast message is transmitted from an originating subscriber unit (110, FIG. 1) through a network of satellite communications nodes (120, 130, and 140) to a plurality of receiving subscriber...
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