Tech Briefs

LEGEND (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.

This work was done by Jer Chyi Liou and Doyle T. Hall of Johnson Space Center. MSC-24805-1

This Brief includes a Technical Support Package (TSP).

LEGEND, a LEO-to-GEO Environment Debris Model (reference MSC-24805-1) is currently available for download from the TSP library.

Please Login at the top of the page to download.

The U.S. Government does not endorse any commercial product, process, or activity identified on this web site.