Geometrical guidance algorithm for soft landing on lunar surface

M. P. Rijesh, G. Sijo, N. K. Philip, P. Natarajan

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)


Augmented design of a guidance algorithm previously developed for intercepting target in a missile-target engagement scenario, but catering to powered descent soft landing on lunar surface is the main focus of this paper. When it comes to lunar soft landing guidance formulation, it is required that the Lander reach the desired position with terminal velocity constraints. An existing circular guidance law developed for missile guidance is modified to be applied for the fine braking phase of lunar powered descent. Presently in the algorithm, at the beginning of each guidance cycle, there will be an assumed varying circular path from missile to target and the guidance solution lies in finding the acceleration towards the centre of the circle so that the missile moves towards the target. The design augmentation proposed for lunar landing introduces a quadratic acceleration term opposite to the instantaneous tangential velocity vector to ensure terminal conditions. Coefficients of the quadratic acceleration profile are determined by the length of the circle as well as the magnitude of instantaneous tangential velocity. Finally a simple compensation scheme based on comparison of actual velocity from sensors and expected velocity from the algorithm is also proposed to take care of the variation in gravity and error in initial mass estimate.

Original languageEnglish
Pages (from-to)14-19
Number of pages6
JournalIFAC Proceedings Volumes (IFAC-PapersOnline)
Issue numberPART 1
Publication statusPublished - 01-01-2014
Externally publishedYes
Event3rd International Conference on Advances in Control and Optimization of Dynamical Systems, ACODS 2014 - Kanpur, India
Duration: 13-03-201415-03-2014

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering


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