Hello everyone.
I want to calculate relative speed of two satellite with TLE. I propagated the satellites and extract velocity as below but the result is not correct
// Extract the velocity vectors
Vector3D velocitySat1 = stateSat1.getPVCoordinates(inertialFrame).getVelocity();
Vector3D velocitySat2 = stateSat2.getPVCoordinates(inertialFrame).getVelocity();
// Calculate delta-v
Vector3D deltaV = velocitySat2.subtract(velocitySat1);