Want to do Something Cool with Communications and Coverage?

With the Communications and Coverage modules, you can determine the surface area on Earth that is covered by a three (3) dB antenna contour. The intent of this blog is to walk you through how to set up the antenna, create the antenna contour, and compute the surface area.

How Do You Compute Surface Area on the Earth?

Before you begin computing the surface area on the Earth, you will need to set the stage for the scenario.

  1. Create a scenario with a satellite and a facility.
  2. Add a transmitter to the satellite and a receiver on the facility.
  3. Use the Area Target Wizard to create an area target of desired size and location.
  4. Example values for an area target

  5. Create a Coverage Definition and Assign the satellite transmitter as the Asset.
  6. Select the Area Target as the Custom Region in the Grid Area of Interest.
  7. Enter an appropriate Point Granularity.
  8. Example of a Point Granularity

  9. Select the Grid Constraints Options to ensure each grid point takes on the properties of the facility receiver.
  10. Compute the Coverage by selecting Compute Accesses in the Coverage Definition.

Add a Figure of Merit

  1. Add a Figure of Merit as a child of the Coverage Definition.
  2. Example of Figure of Merit values

  3. Set the Figure of Merit type to Access Constraint.
  4. Set the Constraint to LinkEIRP.
  5. Determine the maximum LinkEIRP value and subtract three (3) dB. Set this result equal to the Satisfaction Threshold e.g. Satisfied if Greater than 38.0376 dBW for a transmitter.
  6. Example Transmitter values

    Example Antenna values

LinkEIRP (dBW) = Power (dBW) + Maximum Gain (dB) – 3 dB = 0 dBW + 41.0376 dB – 3dB

Run the Percent Satisfied Report

  1. Select the Figure of Merit in the Object Browser.
  2. Extend the Analysis menu.
  3. Bring up the Report and Graph Manager.
  4. Generate the Percent Satisfied report.

    Example of Percent Satisfied Report


About VKochhar

Vineet Kochhar is a senior aerospace engineer who has been with AGI’s Product Support team for the past 14 years. Aside from fielding customer questions about AGI technology, Vineet is the primary contact for questions about the STK modules STK/Comm and STK/Radar. He has also worked on development of STK training materials. Vineet has been in the field of communications & network engineering for the last 28 years. Before joining AGI, Vineet worked as a communications engineer for Lockheed Martin in the Global Telecommunications division, and at Martin Marietta & General Electric in the Strategic Systems division. He has worked with Communications Network Analysis and Bit Level Simulations, Geographic Information Systems (GIS) tools, and has developed a communications network simulator. Vineet holds a B.S. in electrical and computer engineering from Drexel University and an M.S. in electrical engineering- communications systems from University of Southern California (USC).
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