Atmospheric Reentry Dispersion Correction Ascent Phase Guidance for a Generic Reentry Vehicle

  • Avinash Chander Defence Research and Development Organisation, New Delhi
  • Iyyanki V. Murali Krishna Jawaharlal Nehru Technological University, Hyderabad
Keywords: Reentry dispersion, launch vehicle injection point accuracy, atmospheric effects, reentry vehicle


Launch vehicle explicit guidance mechanism depends on the estimation of the desired burnout conditions and driving the vehicle to achieve these conditions. The accuracy of the vehicle at the target point depends on how tightly these conditions are achieved and what is the strategy used to define the trajectory. It has been observed inthe literature that most of the guidance mechanisms during reentry use vacuum guidance equations that is durin greentry the atmospheric effects are not considered. In order to achieve minimum miss distance at the target point theat mospheric effects are to be considered during the guided phase and appropriate corrections should be executed,otherwise depending on the reentry flight path angle and ballistic coefficient the errors can be as high as tens of nautical miles. In this paper, the authors develop a novel approach to these vacuum guided launch vehicle problems.The paper elaborates how to calculate a prior the reentry dispersion during the ascent phase guidance and provide guidance corrections such that the terminal conditions are achieved with higher accuracy.

Defence Science Journal, 2013, 63(3), pp.233-241DOI:

Author Biographies

Avinash Chander, Defence Research and Development Organisation, New Delhi
Mr Avinash Chander received his BE(Electrical Eng.) from IIT Delhi, in 1972and MS (Spatial Information Technology) from Jawaharlal Nehru Technological University, Hyderabad. He is presently working as Distinguished Scientist in DRDO.He received many Awards like, DRDO scientist of the year-1989, Astronautical Society of India Award-1997, DRDO AGNI self-reliance award-1999, Dr Biren Roy Space award-2000, DRDO Award for pathbreaking research/outstanding technology development-2007,Outstanding technologist Award-2008 by Punjab TechnicalUniversity. His areas of interest include: Navigation, guidance,mission design.
Iyyanki V. Murali Krishna, Jawaharlal Nehru Technological University, Hyderabad
Dr Iyyanki V Murali Krishna received his MTech from IIT Madras and PhDfrom IISc, Bangalore in 1977. He ispresently working as Director, Instituteof Science and Technology and Coordinatorof Centre for Atmospheric Sciences and Weather Modification Technologies at Jawaharlal Nehru Technological University,Hyderabad. His areas of interest includes: Geospatial technologyand data mining, soft computing technologies, disaster management, satellite meteorology and weather informatics.
How to Cite
Chander, A., & Krishna, I. (2013). Atmospheric Reentry Dispersion Correction Ascent Phase Guidance for a Generic Reentry Vehicle. Defence Science Journal, 63(3), 233-241.
Aeronautical Systems