Teklif edilmiş sudan yer gözlem uydusu için haberleşme sistemi ön tasarımı

Sudan is one of the richest countries in the world in terms of natural resources, agricultural fields in particular. The cost of monitoring these resources from space is very high. Establishing a national satellite mission has large initial cost, but it has a large significance in the long run. SudaSat-1 is a proposed earth observation satellite mission funded by the government of Sudan to obtain high resolution images of various areas of the country and other countries as per request. Establishing reliable communication is an essential function for any spacecraft; the failure of communication means loss of mission, the goal of this thesis is to provide a preliminary design for the communication subsystem for SudaSat-1 satellite. The thesis provides a review of similar satellite missions to gain insight of the main considerations involved in the design. The review focused on the satellites with the same spatial resolution. The main characteristics of remote sensing satellites is reviewed, image acquisition modes are also explained. Satellite baseline mission design is introduced, a satellite platform is selected to satisfy overall mission requirements, imaging sensors specifications together with satellite orbit characteristics are also determined to provide the required ground sampling distance. Satellite orbit is designed and simulated using STK, orbit period and average communication time is determined. The thesis highlights mission design elements that influence the design and implementation of the communication subsystem. Communication subsystem-level requirements, functions and design components are overviewed. Components selection is based on requirements satisfaction and space heritage. Redundancy of critical components is put into consideration to increase the reliability of the subsystem. Separate downlink channels are set for imagery data (Xband) and engineering data (S-band). Satellite link power budget is calculated for both downlink channels and for uplink channel. An acceptable value of power margin is obtained. Communication subsystem architecture is presented showing the interconnection between main subsystem components. Satellite data transfer plan is determined illustrating the steps followed to transfer imagery and engineering data downlink and commands uplink