“…Moreover, in most previous work about elliptical rendezvous, the target orbital elements are considered as priori knowledge and the chaser spacecraft is able to receive real-time orbital information by communication with the target spacecraft or ground stations. In this way, the authors in [12,13,14,15] design feedback controllers to directly compensate the terms of the relative motion equations with time-varying parameters by using the known orbital information. For some non-cooperative targets, such as damaged spacecraft, space debris, and asteroid, the accurate relative motion of the space rendezvous is usually difficult to obtain since the orbital information of the target orbit is unknown.…”