Russia's Workhorse Space Taxi Gets a Makeover. Beginning in 2016, the signals from the autonomous navigation system, ASN, sent to mission control via two Luch data relay satellites, could also be used to pinpoint the landing site by the search and rescue team. The undocking process occurred when the Soyuz’s hooks between the two vehicles were opened before the separation sequence passively propelled Soyuz away from the Station at an opening rate of 0.1 meters per second. In case the automated control of the landing trajectory is impossible, but other means for maneuvering the capsule are still functioning, the crew can still try the aerodynamic descent mode or switch to a ballistic mode.
️ LIVE NOW: The journey back to Earth begins! Soyuz can land with an accuracy of only 28 kilometers, (with a probability of 0.9997), in the automated aerodynamic descent mode, AUS, relative to the center of the projected landing area.
Opening of the Soyuz' parachute system as seen from the Descent Module.
Moreover, in case of a ballistic return, the capsule can end up as far as 600 kilometers short of the primary landing site for the aerodynamic mode. This committed the craft and its trio of humans to reentry and then landing 54 minutes later.