The Space Technology 8 Mission

Abstract

Abstract-The Space Technology 8 (ST8) mission is the latest in NASA's New Millennium Program technology demonstration missions. ST8 includes a spacecraft bus built by industry, flying four new technology payloads in lowEarth orbit. This paper will describe each payload, along with a brief description of the mission and spacecraft. The payloads include a miniature loop heat pipe intended to save mass and power on future small satellites, designed and built by NASA's Goddard Space Flight Center; a lightweight, 35g/m linear mass, 40-m deployable boom intended as a future solar sail mast built by ATK Space Systems; a deployable, lightweight Ultraflex solar array producing 175W/kg, also built by ATK Space Systems; and a high-speed, parallel-processing computer system built of state-of-the-art COTS processors, demonstrating SEU tolerance without the need for radiation-hardened electronics, and 100M operations per second per Watt processing throughput density.

Fuzzy Disturbance Observer-Based Sliding Mode Control for Liquid-Filled Spacecraft With Flexible Structure Under Control Saturation

“…Assumption 1 [48], [49]: Let f (x) be a continuous function defined on a compact set M x . Then, for any constant ε > 0, there exists a fuzzy logic system (12)…”

“…In this work, we design the fuzzy disturbance observer for spacecraft attitude control system. Based on the (10) and (12), the FDO is constructed aṡ…”

“…However, The missions of the spacecraft are becoming increasingly complex, flexible appendages [10] and liquid storage chamber [11] are widely adopted on the spacecraft, which not only change the control mode but also make the control more difficult. For example, there are some features of highly flexibility and low damping for flexible appendages such as solar panels and long antennas [12]. Hence, the control performance and stability of LFS-FS would be deteriorated due to the coupling between the rigid body and the flexible appendages [13]- [15].…”

Spatial avoidance of hardware faults using FPGA partial reconfiguration of tile-based soft processors

“…One of the biggest challenges in using FPGAs in aerospace applications is the susceptibility of the configuration RAM to SEUs [10][11]. Typically, FPGAs that are used in high radiation environments have a fusebased configuration RAM.…”