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As such, I was wondering if there is a way to accurately track both position and velocity for the launch vehicle's ascent to orbit. How would tracking multiple reference targets be achieved during a real launch event? You cannot. Position and velocity are dependent variables (velocity is by definition the time derivative of the position), so controlling one ...


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As such, I was wondering if there is a way to accurately track both position and velocity for the launch vehicle's ascent to orbit. If possible, have more accurate actuators and reference models. Improves the tracking of states easier. But since there is a relationship between position and velocity you cannot properly control both. The reason is simple: If ...


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If you want a complete answer about how SGP4 (or SDP4) does it, you should read form the original source: The Space Track Report #3. For the actual theory behind, you should read the references by Hujsak and Hoots, for which I could not have access. During the description of SDP4 routines, it says: "At this point SDP4 calls the initialization section of ...


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