US: US space agency, NASA is considering of sending a robotic service mission in Low Earth Orbit. The objective of this mission is to create affordable technology which could be used by US space industry in becoming a leader in satellite servicing in space. If succeeds, it can change the experimental status of present technology to something which is utilized regularly.
Hence, the SSCO is developing a program called Restore-L. It is a planned mission of robotic spacecraft which will be equipped in various instruments that will include refueling other satellites in the space. Restore-L spacecraft will be equipped in autonomous navigation system and avionics which will be used during flight and rendezvous.
This navigation system is named RAVEN (Relative Navigation System-upgraded version of ARGON system tested in 2013 under MISSE-7 and STP-H4 programs), and will based on computers, cameras and proximity sensors. The system is going to be heavily complicated because the rendezvous will be performed at a speed of 16000 km/h and necessary course corrections will be performed in real time.