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  1. GMAT
  2. GMT-7004 NPlate SRP Model Compare Error
  3. GMT-7015

Verify SPAD Propagation using Nadir Pointing s/c attitude


    • Type: Sub-task
    • Status: Resolved (View Workflow)
    • Priority: P1
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: ForceModel
    • Labels:
    • Sprint:
      Active Development


      I propagate two Sun orbiting s/c and expect identical results.

      1) SC 1. Canon-ball SRP, area=500, mass = 1000 kg, Cr=1 (absorption)

      2a) SC 2, SPAD SRP, mass = 500.

      2b) S/C attitude set so that s/c body X axis points towards the Sun. S/C to Sun unit vector should always be (1,0,0) in the s/c body frame. (equivalent to RA=DEC=0 in the SPAD file).

      2c) In the SPAD file, I set the Area vector to 0 unless the dot product of the SA normal (s/c body X axis) and the s/c to Sun vector is > cosd(0.01).

      The difference between the two propagations is 0. (for future runs, may want to use 1 degree as cutoff to avoid roundoff errors)

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