# A Study of Cislunar-Based Small Satellite Constellations with Sustainable Autonomy
## 6 Discussions
The operations are widely impacted due to this environmental activity from the Sun. The SRP force and torque are two parameters that significantly affect the operations. Hence, these are to be calculated onboard and on the ground to continuously and autonomously monitor SRP for each satellite in a constellation. This can be seen in Figure 9, with a thorough comparison of normal to critical conditions. This can be seen in the results from Figure 9a,c, showing that the normal and critical scenarios are so different from each other with regard to SRP forces. The variations from normal conditions to critical ones are so harsh that they can be as much as 10 times the force in the normal scenario, and this is the same for the SRP torque calculated for Figure 9b,d. This is the most difficult portion when critical situations occur due to the SRP on the satellites in the constellation. Hence, synergic and balanced use of autonomy can reduce this impact significantly, navigate satellites away from the dangers, and stabilize orbits for continued operations with as minimal losses as possible. This also signifies that the Earth's lower orbits, which are essential for the scientific and technological observations needed for applications for Earth, have an impact on SRP, which needs immediate attention and to reduce the number of satellites in a constellation. This can be done with adequate design of the constellation with optimal coverage and proposed methodology. This aspect has been taken care of in this research as well, and the importance of SRP analysis is, hence, observed and portrayed. For the Moon's side of the Cisluunar space, the operations and the orientation of the small satellite constellation are quite unique with a significant inclusion of the Near Rectilinear Halo Orbits (NRHOs) for the long-term missions to establish habitation on the Moon's surface. Hence, the role of autonomous small satellite constellations will be of much importance, adding operational value to other bigger missions. This addition to the Cisluunar space has been celebrated due to recent success in deep space, specifically in the NRHOs and lower lunar orbits. Parametric analysis varies differently in the lunar orbits as the orientation and the orbital definitions are unique to the Moon's local environment and its positioning in the Cisluunar space with respect to the Sun and the Earth. Figure 10 depicts a major outlook of the visual demonstrations of the simulations. As can be seen, several scenarios have been portrayed within the Moon's orbital area of the Cislunar space. Figure 9(a),b differ in their scenario as they show a major change from perturbations and the SRP occurs in the orbital orientation of the constellation as a whole. In Figure 9(a), the colors can be observed that all are different defining operations from each satellite in the constellation. As soon as perturbations intensify, the colors change, notifying the operator on the ground that severe perturbations and SRP are being observed at that instance, as shown in Figure 9(b). The orbital altitude-based coloring is shown due to observing the most impacted orbits in this scenario of criticality. This signifies the simple but effective observation autonomously that is evolutionary in itself and creates solutions that are impactful but simple in operation. These are observed in a variety of other observations both in inertial and body frames to give a sense of different scenes from the operations. This is also done specific to Lunar orbits due to their distance from Earth and to get immediate or as early alerts as possible in case of a possible perturbation or a possible collision. Uttmost efforts have been made to interface the real-time scenarios to the simulations aligned in this paper with NRHOs included, and its placement with respect to the Earth and the Moon is closely observed. The final simulations have been portrayed after several trials and with the study of the current trends and requirements in the Cislunar space.