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  1. GMAT
  2. GMT-7092

Sim/Est residuals using the RK4 integrator

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      In a simulate/estimate case with no measurement noise, using the RK4 integrator with a 60-second step size, first iteration residuals are quite large (up to 130 meters). Naively, one would expect that even if the low-order integrator and large step size introduce errors in the simulation, that consistent errors would occur in the estimation, and therefore still yield small residuals.

      The effect decreases dramatically for higher order integrators or when using smaller step sizes.

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