- 3 Designs for 5 tracking stations supporting the Japanese HALCA mission
- DSN design, by Scientific Atlanta, based on design for much simpler existing stations
- Usuda design by NEC
- Greenbank based on VLBA with significant modifications
- All perform the identical functions
- Interpret global schedule of events
- Follow moving satellite
- Up-link maser referenced tone
- Record down-linked satellite data
- Estimate error in up-link frequency