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Abstract
A lateral guidance algorithm developed for the high Mach entry phase of winged vehicles is presented in this paper. The vehicle is guided to meet the cross range and velocity azimuth at the end of entry phase. During entry phase, the vehicle has to be guided to meet the desired downrange and cross range requirements under dispersions in initial conditions and aerodynamic uncertainties. Guidance algorithms developed to meet the down range (in-plane) requirements uses bank angle (rotation of the vehicle about velocity vector) modulation. Bank angle modulation results in lateral drift of the vehicle leading to cross range dispersions and velocity azimuth deviations. A numerical predictor which integrates the equations of motion to predict cross range error and azimuth error at the end of entry phase is developed. A dual bank reversal algorithm is developed which determines the time of bank reversals using a predictor-corrector algorithm onboard. Simulation studies carried out show that the guidance algorithm meets the requirements even for large dispersions in initial conditions and aerodynamic uncertainties.
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References
- Harpold, J.C. and Graves, C.A. Jr., "Space Shuttle Entry Guidance", Journal of the Astronautical Sciences, Vol.27, No.3, 1979, pp.239-268.
- Saraf, A., Leavitt, J.A., Chen, D.T. and Mease, K.D., "Design and Evaluation of an Acceleration Guidance Algorithm for Entry", Journal of Spacecrafts and Rockets, Vol.41, No.6, 2004, pp.986-996.
- Zuojun Shen and Ping lu., "Dynamic Lateral Entry Guidance Logic", AIAA Guidance, Navigation and Control Conference, AIAA 2004-4773, 2004, pp.1-18.
- Gifty Benjamin, R., Rajeev, U.P., Lalithambika, V.R. and Dhekane, M.V., "Commanded Drag Guidance for Entry Phase of Winged Vehicles", Proceedings of Embedded Guidance and Control in Aerospace, IFAC Sponsored Workshop, Indian Institute of Science, Bangalore, 2012.
References
Harpold, J.C. and Graves, C.A. Jr., "Space Shuttle Entry Guidance", Journal of the Astronautical Sciences, Vol.27, No.3, 1979, pp.239-268.
Saraf, A., Leavitt, J.A., Chen, D.T. and Mease, K.D., "Design and Evaluation of an Acceleration Guidance Algorithm for Entry", Journal of Spacecrafts and Rockets, Vol.41, No.6, 2004, pp.986-996.
Zuojun Shen and Ping lu., "Dynamic Lateral Entry Guidance Logic", AIAA Guidance, Navigation and Control Conference, AIAA 2004-4773, 2004, pp.1-18.
Gifty Benjamin, R., Rajeev, U.P., Lalithambika, V.R. and Dhekane, M.V., "Commanded Drag Guidance for Entry Phase of Winged Vehicles", Proceedings of Embedded Guidance and Control in Aerospace, IFAC Sponsored Workshop, Indian Institute of Science, Bangalore, 2012.