The Earth Observing 1 (EO-1) mission is part of NASA’s New Millennium Program (NMP). The EO-1 Attitude Control System (ACS) flight software was based on the Tropical Rainfall Measuring Mission (TRMM) flight software, both of which were developed by the Hammers Company, Inc. Lessons learned during TRMM ACS software development led to a consolidated software development approach for the EO-1 ACS....

One definition of Responsive Space is the ability for mission-specific payloads and support systems to be rapidly integrated within a short period. However, as components are added to the spacecraft, the complex interactions between subsystems must be noted and, if possible, modeled. This process is extremely time consuming and, when done poorly (or not at all), is a major contributor to spacec...

The study considers the problem of restoring covariance function fluctuations in refractive index ionosphere based on analysis random changes frequency radio signal. To solve problem, a trans-ionospheric signal an information transmission line is used, radiated from low-orbit spacecraft and received at stationary receiving point. A method for estimating ionospheric parameters data one typical c...

Thermal management systems for space equipment commonly use static solutions that do not adapt to environmental changes. Dynamic control of radiative surface properties is one way to respond to environmental changes and to increase the capabilities of spacecraft thermal management systems. This paper documents an investigation of the extent to which origamiinspired surfaces may be used to contr...

Small satellites and sensor payloads aboard larger spacecraft can benefit from ground support equipment (GSE) which reduces the time and cost of developing and flight qualifying space instruments. Userfriendly microcomputers and a comprehensive system design make such GSE possible and, due to the availability of high speed processors with real-time operating systems, even sophisticated instrume...

Mixed Control Moment Gyro and Momentum Wheel Attitude Control Strategies C. Eugene Skelton II Attitude control laws that use control moment gyros (CMGs) and momentum wheels are derived with nonlinear techniques. The control laws command the CMGs to provide rapid angular acceleration and the momentum wheels to reject tracking and initial condition errors. Numerical simulations of derived control...

A key goal of NASA's New Millennium Program (NMP) is the development of technology for increasing spacecraft on-board autonomy. Achievement of this objective requires the development of a new class of ground-based autonomy testbeds that can enable the low-cost and rapid design, test and integration of the spacecraft autonomy ight software. This paper describes the development of an Autonomy Tes...

The cost models for return on investment for constellations of large spacecraft providing high quality, high temporal resolution Earth observation data are not currently sustainable. Even with economies of scale, the costs involved in the materials and launch of the spacecraft alone will result in an expensive final product only accessible for customers of considerable means to afford the data....