297 results about "Satellite tracking" patented technology

A terrestrial C/A code GPS receiver system digitally samples, filters and stores a segment of 11 half chips of the received composite as a binary number and multiplexes this number for parallel correlation with each of a series of multibit code replicas for the satellites to be tracked. Each of the time delay specific correlation products are accumulated in a cell of a memory matrix so that at least twenty two delays for each satellite may be evaluated each code period providing fast reacquisition, even within a city intersection, as well as correction of multipath tracking and multipath interference. All cells of the memory matrix may be used for a acquisition of a single satellite in about 4 ms. Two satellite tracking, in addition to altitude hold, uses cross track hold alternating with clock hold to update the cross track estimate. Single satellite tracking uses cross track and clock hold together. Navigation data is updated with detected changes in motion including turns.

An energy conserving tracking tag for receiving a radio frequency location data signal from a global positioning satellite and for communicating with a tracking system. The tag includes a receiver circuit for receiving the location data signal from the global positioning satellite, a customer ID module for generating a unique tag identification signal, a transponder circuit for receiving command signals from the tracking system, and a power circuit electrically engageable with a battery power supply and an external power source. The tag also includes a programmable microprocessor in electrical communication with the power circuit, receiver circuit, customer ID module, and transponder circuit. The microprocessor is operative to collect the location data signal, the identification signal, and the command signals, and subsequently produce an composite output signal. The transponder is further operative to transmit the composite output signal to the tracking system by radio carrier wave.

Methods are disclosed for using an Internet server with access to a data base of PSAP (Public Safety Answering Point) jurisdiction boundaries and telephone numbers to track the location of a wireless communication device and to determine a PSAP telephone number to call to request emergency services at the location of said wireless communication device using telephone company provided location information. Methods are disclosed for establishing conference call connections between a person, a PSAP and a remote wireless communication device. Also disclosed are methods for establishing an Explicit Call Transfer call connection that redirects a call from a person to a wireless communication device to the telephone of a PSAP having jurisdiction over the location of said remote wireless communication device. Alzheimer tracking devices, offender monitoring devices, medical alert notification devices, satellite tracking devices and child safety telephone embodiments of the current invention are also disclosed.

Antenna and satellite communications assemblies and associated satellite tracking systems that may include a low profile two-way antenna arrangement, tracking systems, and applications thereof. Applications for the system include military, civilian, and domestic emergency response applications. The antenna arrangements may be configured to form a spatial multi-element array able to track a satellite in an elevation plane by electronically dynamically targeting the antenna arrangement and/or mechanically dynamically rotating the antenna arrangements about transverse axes giving rise to generation of respective elevation angles and dynamically changing the respective distances between the axes whilst maintaining a predefined relationship between said distances and the respective elevation angles. The system provides autonomous dynamic tracking of satellite signals and can be used for satellite communications on moving vehicles in a variety of frequency bands for military and civilian applications.

Method and apparatus for locating position of a remote receiver is described. In one example, long term satellite tracking data is obtained at a remote receiver. Satellite positioning system (SPS) satellites are detected. Pseudoranges are determined from the remote receiver to the detected SPS satellites. Position of the remote receiver is computed using the pseudoranges and the long term satellite tracking data. SPS satellites may be detected using at least one of acquisition assistance data computed using a previously computed position and a blind search. Use of long term satellite tracking data obviates the need for the remote receiver to decode ephemeris from the satellites. In addition, position of the remote receiver is computed without obtaining an initial position estimate from a server or network.

A method of communicating satellite tracking information among a network of global navigation satellite system receivers is described. The method includes determining at a first GNSS receiver which satellites in a constellation of satellites have been continuously tracked over a preceding selected time period, and for each such satellite determining its elevation with respect to the zenith. Only the elevation value for the lowest satellite in the set of satellites for which all satellites of higher elevation values have been continuously tracked over the selected time period is then transmitted to the second GNSS receiver. That receiver can then reconstruct the set of satellites which have been continuously tracked.

Antenna and satellite communications assemblies and associated satellite tracking systems that may include a low profile two-way antenna arrangement, tracking systems, and applications thereof. Applications for the system include military, civilian, and domestic emergency response applications. The antenna arrangements may be configured to form a spatial multi-element array able to track a satellite in an elevation plane by electronically dynamically targeting the antenna arrangement and/or mechanically dynamically rotating the antenna arrangements about transverse axes giving rise to generation of respective elevation angles and dynamically changing the respective distances between the axes whilst maintaining a predefined relationship between said distances and the respective elevation angles. The system provides autonomous dynamic tracking of satellite signals and can be used for satellite communications on moving vehicles in a variety of frequency bands for military and civilian applications.

Method and apparatus for using long term satellite tracking data in a remote receiver is described. In one example, long term satellite tracking data is received at a remote receiver from a server. The long term satellite tracking data is used to compute acquisition assistance data in the remote receiver. The remote receiver then uses the acquisition assistance data to acquire satellite signals. The acquired satellite signals may be used to locate position of the remote receiver.

The invention relates to a method for controlling array light beam co-target collimation of a target in a loop based on light spot centroid calculation. The coordinates of the centroid of a light spot on an imaging plane are obtained through a light spot centroid algorithm, a tilt control quantity which needs to be conducted on each light beam is obtained according to the quantitative relation between tilt control of a tilting mirror of the corresponding light beam and a light spot movement vector, and the centroid of the light spot is moved to a target spot of an image device through control over the tilting mirrors. Co-target collimation of all the light beams of the target in the loop is realized through sequential control cover the array light beams. There is no need to accurately describe or obtain a light path, and a control scheme is simple and convenient and easy to implement. The adopted centroid of the light spot serves as a performance evaluation function which is simple, convenient, high in real-time performance, and remarkable in effect, and consumes a short time. The method for controlling array light beam co-target collimation of the target in the loop based on light spot centroid calculation has extensive application prospects in satellite tracking, the directed energy technology and other fields.

A satellite tracking system includes a vehicle having an attitude measuring device for measuring an attitude of the vehicle. An antenna is mounted on the vehicle. An antenna pointing device is coupled to the antenna and points the antenna in a direction dependent upon the attitude measured by the attitude measuring device and a location of a satellite.

A system and method for generating a navigation solution in high interference and dynamic environments using Global Positioning System (GPS) and inertial measurement unit (IMU) data is described. The system configuration is a multi-satellite tracking loop structure obtained by closing each satellite's tracking loop through a single, multi-state navigation filter. This generates a robust navigation solution that can track GPS signals in a lower signal to noise ratio than can the standard GPS tightly coupled tracking loops. The system contains an Advanced Tightly Coupled (ATC) tracking processor which accepts early, late, and on-time I and Q data from the GPS signal tracker and outputs vehicle to satellite range, range rate and range acceleration residual measurements to a navigation Kalman filter. The ATC includes nonlinear discriminators which transform I and Q data into linear residual measurements corrupted by unbiased, additive, and white noise. It also includes an amplitude estimator configured to operate in rapidly changing, high power noise; a measurement noise variance estimator; and a linear residual smoothing filter for input to the navigation filter.

A method and apparatus for monitoring the integrity of satellite tracking data used by a remote receiver is described. In one example, a first set of satellite tracking data is received at a server. Integrity data for a second set of satellite tracking data is generated using the first set of satellite tracking data. The integrity data is then transmitted to at least one remote receiver having the second set of satellite tracking data.

A method and apparatus for generating and distributing satellite tracking data to a remote receiver is disclosed. The method for includes extracting from satellite-tracking data initial model parameters representing a current orbit of at least one satellite-positioning-system satellite, computing an orbit model using the initial model parameters, wherein a duration of the orbit model is longer than a duration of the satellite-tracking data, comparing, for an overlapping period of time, the orbit model to the satellite-tracking data; and adjusting the orbit model to match the satellite tracking data for the overlapping period of time so as to form an adjusted orbit model. The adjusted orbit model comprises the long-term-satellite-tracking data.

An improved satellite tracking antenna system mounted to a moving object and a method for operating the same detect and track elevation and azimuth angles of a satellite using only two gyro sensors in a two-axis satellite tracking antenna system, and detect and track an azimuth angle of the satellite using only one gyro sensor in a one-axis satellite tracking antenna system. The antenna system detects the satellite position using two gyro sensors, which are mounted to be orthogonal to each other to a planar axis perpendicular to a satellite-directed target point of the antenna, and continuously tracks the satellite position using a calibration algorithm without using additional absolute angle sensors, resulting in simplified system configuration and reduced production costs.

The pointing of at least two sensors (61, 62) is ensured through a Luneberg lens (50). A first frame (20) pivoting on a support (10), supports in pivoting manner a second frame (30), which can in turn support the lens (50). The second frame (30, 40) supports at least one rail (41) for guiding the sensors in the vicinity of the focal surface of the lens. Control means (90) act on the mount as a function of data concerning the position of satellites to be sighted. They are arranged so as to temporarily stop the sighting of one of the satellites, bring the mount into an opposite position on the focal surface, whilst continually sighting the other satellite, and resume the sighting of both satellites, the two sensors then being in an inverted position on the rail.

A satellite tracking system for tracking a synchronous satellite includes a satellite antenna system movably supported on a roof of a vehicle via a roof frame to move between an operation position and a folded position. At the operation position, the satellite antenna system is rotated on the roof frame to adjust a horizontal orientation of a parabolic reflector of the satellite antenna system while the parabolic reflector is pivotally lift at a predetermined inclination angle to align with the satellite. At the folded position, the parabolic reflector is pivotally dropped down until the parabolic reflector faces downwardly to the roof of the vehicle to conceal a signal transmitting device of the satellite antenna system between the parabolic reflector and the roof of the vehicle. Therefore, the satellite antenna system provides a relatively low profile at the folded position when the vehicle travels.

The invention discloses a realizing method of a terminal for tracking and positioning, identification, voice video and data transmission of a moving target satellite, in particular to an integrated navigation information system used for completing integrated ship-handling tasks on the basis of an electronic chart. The invention can integrate reckoned ship-position information, satellite positioning and radio navigation system data, chart information, voice information, video information, data information and radar information for processing and display; and the processed result is returned to various control equipment to control or prompt navigating staffs by medias such as images, voices, languages and the like. The invention not only can complete the operations which are carried out on the traditional paper chart and comprise design of intended route, calculation of distance and orientation, reckoning of position modification, positioning calculation, track indication and the like, but also can solve new problems that when the ship enters a danger area, alarming is carried out automatically, the ship avoids rock and prevents shallowness, the superimposing of the electronic chart and the radar images is used for providing more intuitive shockproof information and the chart is modified automatically. The invention can complete the construction of the platforms of the whole set of system.