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STK/Coverage

STK/Coverage STK/Coverage STK/Coverage analyzes when and how well regions on or above the Earth’s surface are "covered" by mission assets. A simple example is determining which areas on the ground can be seen from an aircraft flying over terrain. A more involved example might constrain what the aircraft can see with a sensor field-of-view and report how long any point on the ground is seen at a given image quality.

STK/Coverage defines a spatial area of interest, assets of a system, an analysis time interval, and a Figure of Merit which measures the system effectiveness. The Figure of Merit object allows STK users to funnel large amounts of computed access data into statistics which are understood through custom reports and dynamic 2D or 3D graphics. Graphical animation of these time-varying statistics and the ability to view the system from any vantage point in 3D space provides further insight into temporal geospatial relationships.

Below are some examples of STK/Coverage analysis:

  • What combination of LEO satellites, aircraft, and UAVs will provide 100% coverage (persistent surveillance) over my area?
  • How does the failure of one satellite in a constellation affect overall coverage?
  • What areas are obstructed from satellite communications by the local terrain?
  • Where and when do coverage gaps exist?
  • When do 1, 2, 3, and 4-ball coverage opportunities exist?


  • Highlights

    • Geographic or object-based (launch vehicle, missile, satellite, etc.) coverage analysis over time
    • User-defined coverage areas
    • Areas targets of all countries and U.S. states
    • Cumulative and instantaneous DOP calculations
    • GPS navigational accuracy calculations
    • Percent satisfaction
    • Complete statistical analysis of all data
    • Smooth, filled coverage contours
    • Can be displayed on virtual globes and other application APIs via STK's extensible architecture.

  • Key Features

  • STK/Coverage

    Custom analysis area

    The following options allow user to compute access information for a desired area of interest:

    • Latitude bounds
    • Global coverage
    • Along a meridian or parallel
    • Custom area or line from existing object or shapefile
    • Custom set of randomly placed points
    • Coverage area can exist at any altitude
    • Coverage on central body other than Earth

    Customize the grid using a template object

    Specify the analysis properties to be used over the entire grid area by assigning a template object whose identity was customized to solve a specific problem:

    • STK visibility constraints
    • Terrain altitudes
    • Pointing characteristics
    • User-specified altitude

    Customize assets

    Any vehicle, sensor, facility, chain, or constellation may be an asset with constraints used in access determination. STK objects may be used as assets in any combination.

    Figures of Merit (FOM)

    Condense access information for focused interpretation. Brief descriptions below:

    • Simple Coverage - measures whether or not a point is covered.
    • N Asset Coverage - measures the number of assets available simultaneously during coverage.
    • Coverage Time - measures the amount of time during which grid points are covered, either in total time, time per day, or as a percentage.
    • Revisit Time - measures the duration of intervals during which coverage is not provided.
    • Access Duration - measures the duration of individual coverage intervals.
    • Number of Accesses - measures the number of independent accesses of points.
    • Number of Gaps - measures the number of gaps in coverage of points.
    • Access Separation - measures if a point has coverage from multiple assets within a user-defined time tolerance.
    • Time Average Gap - measures the average length of the coverage gap found if sampled randomly.
    • Response Time - measures the time between a request for coverage at the point and the time at which the coverage is achieved. You may select mean, min/max, or nth-percentile values.
    • Access Constraint - measures the value of a user-selected visibility constraint such as elevation angle or slant range, probability of detection using TIREM, etc.
    • Dilution of Precision - measures the relative level of the uncertainty of a navigation solution due to the relative geometry of the transmitter locations (i.e., Geometric, Position, Horizontal, Vertical, and Time).
    • Navigation Accuracy - measures the uncertainty of a navigation solution based on one-way range measurements from a set of transmitters. Most often, the transmitters are those onboard GPS satellites.

    Satisfaction

    Is a comparison operator which establishes "if" or "when" a FOM is "satisfied." The Satisfaction criteria identify the relationship between the FOM value and the user-specified threshold value (i.e., at least, equal to, at most, greater than, less than). This lets the user quickly answer questions such as:

    • What percentage of the world has coverage more than 80 percent of the time?
    • Over which areas will I have coverage in the next 30 minutes?
    • What regions of the world were covered by more than six specific satellites simultaneously over the last week?
    • What will be the impact of local terrain on GPS navigation capability along a defined route?

    Reports and graphs

    Provide a wide range options for presenting the statistics generated by STK/Coverage.

    Attitude coverage

    Combines features of STK/Attitude and STK/Coverage to enable you to map "pointing" information to an attitude sphere around a vehicle object.

    Single-object coverage

    Evaluates the dynamic coverage to a single object instead of a continuous area.

    Smooth contour generation

    Where the value for each pixel is interpolated from grid values.

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