@Ludo's answer to If I wanted to reconstruct an entire Apollo mission's crewed spacecraft trajectories, what are the key sources of historical data I'd look for? links to Apollo Mission 11, Trajectory Reconstruction and Postflight Analysis Volume 1 (PDF) which contains terms like
- RTCC SS1 and SS2
- MSFN free flight trajectory
- Langley model
- NAT trajectory
- VHF ranging
For the last one (VHF ranging) I would guess that this is a range-rate measurement using VHF frequencies, possibly using some coherent "bent pipe" transponder on one module receiving and rebroadcasting signals from one thing to another. But is this only between the command and lunar modules, or does this also include range-rate measurements from Earth?