NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
LEGEND, a LEO-to-GEO Environment Debris ModelLEGEND (LEO-to-GEO Environment Debris model) is a three-dimensional orbital debris evolutionary model that is capable of simulating the historical and future debris populations in the near-Earth environment. The historical component in LEGEND adopts a deterministic approach to mimic the known historical populations. Launched rocket bodies, spacecraft, and mission-related debris (rings, bolts, etc.) are added to the simulated environment. Known historical breakup events are reproduced, and fragments down to 1 mm in size are created. The LEGEND future projection component adopts a Monte Carlo approach and uses an innovative pair-wise collision probability evaluation algorithm to simulate the future breakups and the growth of the debris populations. This algorithm is based on a new "random sampling in time" approach that preserves characteristics of the traditional approach and captures the rapidly changing nature of the orbital debris environment. LEGEND is a Fortran 90-based numerical simulation program. It operates in a UNIX/Linux environment.
Document ID
20140002264
Acquisition Source
Headquarters
Document Type
Other - NASA Tech Brief
Authors
Liou, Jer Chyi
(NASA Johnson Space Center Houston, TX, United States)
Hall, Doyle T.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
March 24, 2014
Publication Date
October 1, 2013
Publication Information
Publication: NASA Tech Briefs, October 2013
Subject Category
Man/System Technology And Life Support
Report/Patent Number
MSC-24805-1
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
No Preview Available