TNL
TNL stands for Trajectory Nonlinearities. In space and astronautical engineering, TNL refers to the deviations from the nominal trajectory caused by various nonlinear effects such as atmospheric drag, gravitational perturbations, and attitude control errors. These nonlinearities can accumulate over time and cause significant deviations from the intended trajectory, which can be detrimental to the mission objectives. Therefore, TNL analysis is an important aspect of mission planning and design, and it involves the use of advanced mathematical models and simulation tools to predict and mitigate the effects of nonlinearities on the spacecraft trajectory.
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