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In the paper, Rapid Satellite-to-Site Visibility Determination Based on Self-Adaptive Interpolation Technique it is claimed that "Satellite-to-site visibility periods are typically determined by the conventional brute force method."

Is this statement really true? Are there popular alternative ways? How does AGI STK handle this?

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The most common method, by far, is brute force, by propagating the relevant satellite and then calculating the visibility. There are however many ways to optimize this brute force:

  • Large delta-t until "close" and then smaller delta-t after that
  • Using Multi-threading to reduce processing time

Few github examples:

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