In recent times the number of space missions has grown significantly, hence increasing the number of orbiting satellites and consequently space debris. In this context, In-Orbit Servicing (IOS) aims to solve this problem by extending the life of spacecrafts and eventually de-orbiting them once they become obsolete. The purpose of this thesis is to develop an orbital simulator for small satellites (100 ÷ 150 kg) in LEO orbit, capable of accurately reproduce rendezvous and docking manoeuvers. In the future, the developed simulator will be used to test and train Autonomous Navigation (AN) and guidance algorithms developed with AI techniques. In this thesis, a realistic In-Orbit Servicing scenario between a chaser and a target satellite is presented as a case study.