The ground-based tracking station is an integral part of Spektr-M ground-based scientific complex and it operates in conjunction with the onboard highly informative radio complex (VIRK-M), forming the spacecraft-Earth radio link.
Ground Tracking Stations:
Spektr-M spacecraft will be located in heliocentric orbit near the Lagrange point (L2) of the Sun-Earth system. Due to its great distance that is more than 1.5 million kilometers from the Earth, it is necessary to use ground antennas with a mirror diameter of at least 40 meters in order to compensate for the attenuation of the signal in outer space. In Russia, such antennas can be RT-64 (Kalyazin) and RT-70 (Yevpatoriya).
Example of possible ground tracking stations for Millimetron observatory: Parkes (64 meters), Kalyazin (64 meters), Evpatoriya (70 meters)