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    Topo centric - Geocentric Transformation

    dear all, Please let me know the good books for learning topocentric-geocentric transformation and also ECEF and ECI transformation along with mathematical formulas and practical examples . good vettri
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    ECEF TO ECI

    Dear Friends We have a requirement to convert ECEF coordinates to ECI coordinates.. please let us know the formula and code for doing the same. Can anyone reply a solution to this thanks in advance Kanya
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    ECEF TO ECI

    Dear Friends We have a requirement to convert ECEF coordinates to ECI coordinates.. please let us know the formula and code for doing the same. thanks in advance kanya
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    State vector and TLE - Averaging the State vector for Precise Orbital Elements

    Dear boogabooga, Thank you so much for the immediate reply...I have referred those links sent by you... I have used the SGP4 model to calculate sat position from TLE .. Also i have written program to calculate instantaneous elements from single observation (pos,vel) and its output is validated...
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    State vector and TLE - Averaging the State vector for Precise Orbital Elements

    I have a set of State vectors (x,y,z , vx,vy,vz). With Single Epoch value , i have written a program to convert the state vector to TLE (with algorithm given in Vallado book). The same matches to some extend with STK orbital para generated with Single Epoch values. Stk also generates the orbital...
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