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Government and commercial customers are increasingly interested in robust, reusable flight software. For many spacecraft, Attitude Determination and Control Subsystem (ADCS) contributes a significant portion of the FSW. Thus refinements to ADCS code pay dividends for code development and reuse. Sierra Nevada Corporation (SNC) has recently developed an ADCS model and code set that follows model based...
A Command and Data Handling (C&DH) system is being developed as part of a series of CubeSat missions being built at the University of Texas at Austin Texas Spacecraft Laboratory (TSL). With concurrent development of four missions and with more missions planned for the future, the C&DH team is developing a system architecture that can support a variety of mission requirements. The presented...
Small satellite missions are becoming increasingly complex as scientists and engineers propose to utilize them to accomplish more ambitious science and technology goals. Small satellites such as CubeSats are challenging to design because they have limited resources, coupled subsystems, and must operate in dynamic environments.
Large aerospace organizations typically spend significant resources in optimizing system design by means of specialized software (e.g., computer-aided design, simulation). Conversely, architectural decisions are made much faster, with far less resources, and typically, in a much less structured way. This is despite clear indications that architectural decisions fix many design decisions, and have...
The TET (TechnologieErprobungsTräger - Technology Experiment Carrier) satellite bus was designed as a modular and flexible bus for LEO (Low Earth Orbit) missions. Its first mission was the TET-1 satellite which was part of the OOV (On Orbit Verification) program of the DLR (German Aerospace Center) and was launched on July 22nd 2012. The next mission for the TET bus is the BIROS satellite which is...
The Autonomous Ascent and Descent Powered-Flight Testbed (ADAPT) is a closed-loop, free-flying testbed for demonstrating descent and landing technologies of next-generation planetary landers. The free-flying vehicle is the Masten Space Systems Xombie vertical-takeoff, vertical-landing suborbital rocket. A specific technology ADAPT is demonstrating in the near-term is Guidance for Fuel-Optimal Large...
The civil Unmanned Aircraft System (UAS) sector is growing rapidly, with a notable orientation towards applications considered too dull, dirty, dangerous or demanding for conventionally piloted aircraft. Operations in this sector present hazards of two main kinds: to other aircraft, and to people and property overflown by UAS. Methods currently used for assessing these hazards and for managing safety...
This paper presents the design of a compact uniform circular antenna array system used in conjunction with the RT-1944/U radio and reports the obtained experimental results. The proposed system was primarily designed to increase the communications range between Littoral Combat Ship (LCS) sea frames and Mission Package Unmanned Surface Vehicles (USVs) by developing a modular aerostat communications...
This paper introduces a compact optical payload enabling vision-based navigation and hazard detection during terrestrial rocket flights. This payload, the Terrain-Relative Navigation & Descent Imager (TRNDI), serves as an add-on module for Draper Laboratory's GENIE Autonomous-GNC system. GENIE's inertial navigation system relies on GPS during terrestrial test flights, making it insufficient for...
STUDSAT-1 is the first pico-satellite developed in India by the undergraduate students from seven engineering colleges across South India. After the successful launch of STUDSAT-1 on 12th July, 2010, the team is developing STUDSAT-2 which is India's first twin satellite mission. STUDSAT-2 is undertaken by the undergraduate students from seven engineering colleges from the State of Karnataka, India...
In this paper, a novel design of a satellite Fault-Tolerant Distributed On-Board Computer (FTD-OBC) is proposed. The FTD-OBC fault-tolerance and task migration functions rely on a distributed coordination method, which is supported by an Adaptive Middleware for Fault-Tolerance (AMFT) block. The proposed distributed computer is adaptive and reconfigures itself in case of a failure seamlessly by migrating...
This work introduces a novel methodology to assist the evaluation of a wide class of control algorithms for all-type aircrafts using Hardware-in-the-Loop (HiL) based flight simulation. The originality of this paper is using Microsoft Flight Simulator (MSFS) as the environment to embed both dynamic and graphic models of Ascending Technologies Pelican MAV (Mini Aerial Vehicle) flying robot, and using...
The computational demands on spacecraft are rapidly increasing. Current on-board computing components and architectures cannot keep up with the growing requirements. Only a small selection of space-qualified processors and FPGAs are available and current architectures stick with the inflexible cold-redundant structure. The objective of the ongoing project OBC-NG (On-board Computer - Next Generation)...
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