Division — Spaceflight Dynamics
Trajectory Design and Mission Analysis
This subsystem, though not physically associated with the spacecraft, is associated critically with spacecraft design. The subsystem’s preliminary work is to choose a transfer profile to achieve final mission orbit and lay out total propulsion requirements. The Mission analysis segment is responsible for checking the astrodynamic feasibility of each solution in a dynamic envelope of possibilities in terms of analyses of error sources, risks involved, injection constraints and sensitivity.
Guidance Navigation and Control
Guidance Navigation and Control is responsible orbit determination, prediction, and control. The primary task of the subsystem would be to give preliminary and precise OD to support all phases of trajectory within bounds. The subsystem will be responsible for the pre-flight design of optimal deterministic maneuvers and in-flight design of statistical maneuvers for trajectory/orbit maintenance and control within capture corridors for the transfer trajectory. GNC will comprise of a Ground Flight dynamics segment with personnel and infrastructure to support the mission during its lifetime to suffice successful transfer, Lunar Orbit Injection, and Stationkeeping.
Attitude Determination and Control
The ADCS subsystem is responsible for determining and controlling the spacecraft attitude in space. The main functions of the ADCS subsystem can be divided into Determination, Prediction, and Control. Attitude determination is the process of computing the spacecraft orientation, within a pre-defined accuracy, using the data obtained from the on-board sensors. Attitude prediction is the process of forecasting the future attitude using dynamic models, and attitude control is the process of orienting the satellite in a specified direction using actuators and momentum exchange devices.