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Patents

Patents

AGI holds many official patents on innovations created by employees and incorporated into AGI technologies.

Paul Graziani Edward Mackey David Massa

Method for Visualizing Data Clouds Using Color and Opacity Blending

This patent covers a method developed for AGI software to analyze and visualize large data sets.

Dr. Sergei Tanygin

Visualization of Field-of-View Constraints

This patent covers a method used in AGI software to compute one or more directional contours or horizons that encompass regions of space visible to the sensor. AGI's core COTS software offering, STK, uses this invention to determine and visualize complex visibility... conditions that arise when sensor field-of-view is further limited by additional constraints, for example, the ground sample distance. With this method, STK leverages its comprehensive system of visibility computations to produce accurate and informative visualizations of complex time-dynamic geometries on 2D maps and in 3D scenes. AGI will release STK version 9.1 this month. More

Jim Wright William Chuba Dick Hujsak

Method for Refining State Estimates of a Global Positioning System (GPS) Receiver Based Upon Sequential GPS Carrier Phase Measurements

  • Patent 7,423,583
  • Issued: 09.09.08
  • Inventor: Jim Wright, William Chuba, and Dick Hujsak

Sequential GPS Doppler carrier phase count measurements are used for precision sequential determination of position and velocity of a GPS receiver, such as for orbit determination and geolocation, with minimum throughput time. Real-time orbit determination... and geolocation performance is enabled with an optimal sequential filter, and near-real-time performance is enabled with an optimal fixed-lag smoother. Many problems associated with prior art orbit determination are eliminated by addressing the "cycle slip" problem, the unknown initial range problem with RANGE.sup.CP measurement representations, the problem of serial correlation in the measurements due to reprocessing of overlapping thermal noise. Also, the present invention significantly attenuates the carrier signal phase variation due to rotation of receiver antenna relative to transmitter antenna because the sequential phase count time intervals are sufficiently short. More

Dr. Haroon Rashid Dr. Sergei Tanygin

A System and Method for Visualization and Attitude/Position-Dependent Data

  • Patent 7,224,311
  • Issued: 05.29.07
  • Inventor: Dr. Haroon Rashid and Dr. Sergei Tanygin

An attitude sphere is defined around an object of interest located at the center. Grid points are defined on the surface of the attitude sphere to represent directions. An attitude dependent FOM result is mapped onto the sphere, which is color... coded on the associated point to visualize attitude dependency. When used to analyze signals arriving at a receiver, the method accounts for motion of the receiver, the transmitter, and the signal sources. More

Jim Wright William Chuba Dick Hujsak

GPS Carrier Phase Measurement Representation and Method of Use

This patent covers technology used in AGI's Orbit Determination Tool Kit, and discusses how real-time orbit determination and geolocation performance is enabled with an optimal sequential filter and how near-real-time performance is supported... by an optimal fixed-lag smoother. Many problems associated with prior art orbit determination are eliminated by addressing the "cycle slip" problem, the unknown initial range problem with RANGE.sup.CP measurement representations, the problem of serial correlation in the measurements due to reprocessing of overlapping thermal noise. Also, the present invention significantly attenuates the carrier signal phase variation due to rotation of receiver antenna relative to transmitter antenna because the sequential phase count time intervals are sufficiently short. More

John Carrico Frank Stoner

Method and Apparatus for Sequentially Profiling and Solving Problems in Space Mission Analysis

This patent covers technology used in AGI's STK/Astrogator module. It provides a system and method for orbital planning that allows iterative calculations of orbital parameters to be accomplished in an automated way with one parameter solution... serving as input to the next parameter's calculation. A software program employs a graphical user interface (GUI) to allow a space mission analyst to set up a series of sub-problems of any desired level of complexity. The program then implements the series automatically and sequentially, incorporating the solution to one sub-problem into the input to the next. More

Dr. Sergei Tanygin

Method and Apparatus for Creating Elements and Systems for Description of Position and Motion of Bodies in Three-Dimensional Space to Support Orbital Maneuver Analysis

This patent covers technology used in AGI's Vector Geometry Tool. It provides a graphical user interface and software architecture that empowers users to create new vectors, axes, points, coordinate systems, and other elements. The explicit... means of creating coordinate systems and primitives are carried out via user input, imported data from files, or any other means of supplying numerical data to computer programs. More

Deron Ohlarik

Method and Apparatus for Determining Obscuration of Sensors that are Mounted on a Spacecraft

This patent is based on an innovation that covers technology used in AGI's STK/Advanced Visualization Option module.The field of view of a sensor mounted on a satellite (or other spacecraft) is obscured by various objects, such as celestial... bodies and the satellite's own solar panels. A method is disclosed for visualizing and quantifying, with respect to time, variations in the portions of the sensor's field of view that are obscured. The graphical output of a satellite systems analysis program, which features high-resolution, three-dimensional, animated images of spacecraft, celestial bodies and other objects in the space environment, is utilized. The graphical output is simplified to only a few colors to differentiate only background and irrelevant objects from relevant objects. Differentiation is also made, using different colors, in representation of those portions of the field of view that overlap relevant (obscuring) objects from the remainder of the field of view which is unobscured. By counting pixels of the respective colors, frame-by-frame during animation, the percentage of obscuration over time is quantified. More

Jim Wright

Method and Apparatus for Orbit Determination

Technology covered by the patent is used in AGI's Orbit Determination Tool Kit. A method and apparatus for estimating the orbits of spacecraft or other objects relative to primary celestial bodies, given applicable measurements. The present... invention uses the variation of parameters in universal variables for spacecraft trajectory propagation during operation of its optimal sequential orbit estimation. This method provides a universal capability for all three conics: elliptic, parabolic, and hyperbolic, forward-time and backward-time numerical integration for filtering and smoothing, respectively. A method for determining local and global estimates of atmospheric density is also provided. A method for realistic orbit simulation provides a means for validating an orbit estimate. More

Tom Johnson

Method and Apparatus for Modelling Transmitter Bandwidth for Telecommunications Analysis

Technology covered by the patent is used in AGI's Orbit Determination Tool Kit. A method and apparatus for estimating the orbits of spacecraft or other objects relative to primary celestial bodies, given applicable measurements. The present... invention uses the variation of parameters in universal variables for spacecraft trajectory propagation during operation of its optimal sequential orbit estimation. This method provides a universal capability for all three conics: elliptic, parabolic, and hyperbolic, forward-time and backward-time numerical integration for filtering and smoothing, respectively. A method for determining local and global estimates of atmospheric density is also provided. A method for realistic orbit simulation provides a means for validating an orbit estimate. More

Dave Holland

Method and Apparatus for Determining Optimal Paths Among Objects of a Communications Network

This invention involves evaluating available links and identifying the optimal path between the starting point and the desired end point in a communications system when the availability of the links is in a constant state of change. The invention has been incorporated into functionality provided to Iridium in the STK/Chains module.

Paul Graziani

Method and Apparatus for Alerting a User Regarding the Position of a Satellite

The patent is based on an invention involving a method for determining the position of a satellite overhead using a portable device such as a wristwatch or handheld computer. The required data can be downloaded from a larger unit, such as a PC, for later use in the field.

Dr. Jim Woodburn

Method and Apparatus for Calculating Access Between Satellite Constellations and Ground Targets

For a given constellation of satellites, each with a number of sensors, this invention is a method for determining the access times between each sensor and multiple ground targets of varying shapes and sizes. This process has been integrated into many key visibility analysis methods within the STK software suite.

Dr. Jim Woodburn

Method and Apparatus for Determining Close Approaches for Earth-Fixed Launch Trajectories

This invention involves a method for minimizing close approaches between a launch vehicle and other objects in space during the launch and early deployment phase of the vehicle. This AGI invention has been incorporated into the close approach analysis feature within STK/Conjunction Analysis Tools (STK/CAT).

Tom Johnson

Method and Apparatus for Modeling Receiver Bandwidth for Telecommunications Analysis

Process for modeling a telecommunications link by automatically scaling the bandwidth of the receiver to take account of the varying data rates and modulation types of one or more transmitters in the system. This is essentially the receiver "autoscaling" feature of the STK/Comm module.

Jimmy Tucholski

Method and Apparatus for Determination of Spacecraft Drag

Process for modeling atmospheric and other types of drag that can affect a satellite over a given interval, such as an orbit period. This can be used to predict orbit decay and calculate fuel requirements for orbit maintenance and station keeping.

Jimmy Tucholski

Method and Apparatus for Determining Exposure of Spacecraft-Mounted Solar Panels to Sun

Process for modeling the exposure of solar power panels on a satellite or other spacecraft to the Sun over a period of time. This can be used to determine the availability of electrical power for operations to be performed by the spacecraft and on-board equipment.

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