Future Directions in Flight Software Assurance

Future Directions in Flight Software Assurance Aerospace is helping mission planners understand and manage the risks associated with an increased reliance on sophisticated onboard software. Elisabeth Nguyen, Robert Pettit, and Myron Hecht   In 1999, the Mars Climate Orbiter was lost as a result of a software error in its navigation system. A few months […]  More »

Modeling the Effect of Thermospheric Changes on Satellite Orbit Lifetime

Modeling the Effect of Thermospheric Changes on Satellite Orbit Lifetime Aerospace conducted a series of simulations to quantify the effect of declining mesospheric density on low Earth orbital lifetimes. Chia-Chun Chao, Richard Walterscheid, and Bernard Yoo During the past 35 years, atmospheric carbon dioxide has increased 4.3 percent per decade. As a result, the density […]  More »

An Aerospace Simulation Scenario

An Aerospace Simulation Scenario The Aerospace simulation uses initial resource deposits as estimated by British Petroleum (BP). Total initial deposits were 1.3 × 1012 tons of coal, 1.2 × 1012 barrels of oil, and 3.3 × 106 tons of uranium ore at the end of 2006. When the simulation is run, shortages of essential resources […]  More »

Simulation Analysis of Resource Depletion and Climate Change Trends

Simulation Analysis of Resource Depletion and Climate Change Trends Aerospace researchers are studying combined climate change models and creating simulation studies to assist the military in planning for future trends and potential world crises. Michael J. Baxter U.S. national security is increasingly being threatened by a number of global trends. These include climate change, pollution, […]  More »