Precision landing at Mars using discrete-event drag modulation

Zachary R. Putnam, Robert D. Braun

Research output: Contribution to journalConference articlepeer-review


An entry, descent, and landing architecture capable of achieving Mars Science Laboratory class landed accuracy (with 10 km of target) while delivering a Mars Exploration Rover class payload to the surface of Mars is presented. The architecture consists of a Mars Exploration Rover class aeroshell with a rigid, annular drag skirt. Maximum vehicle diameter is limited to be compatible with current launch vehicle fairings. A single drag skirt jettison event is used to control range during entry. Three-degree-of-freedom trajectory simulation is used in conjunction with Monte Carlo techniques to assess the flight performance of the proposed architecture. Results indicate landed accuracy is competitive with pre-flight Mars Science Laboratory estimates, and peak heat rate and integrated heat load are significantly reduced relative to the Mars Exploration Rover entry system. Modeling parachute descent within the onboard guidance algorithm is found to remove range error bias present at touchdown; the addition of a range-based parachute deploy trigger is found to significantly improve landed accuracy.

Original languageEnglish (US)
Pages (from-to)3815-3834
Number of pages20
JournalAdvances in the Astronautical Sciences
StatePublished - Jan 1 2013
Externally publishedYes
Event23rd AAS/AIAA Space Flight Mechanics Meeting, Spaceflight Mechanics 2013 - Kauai, HI, United States
Duration: Feb 10 2013Feb 14 2013

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science


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