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Current space assets provide communication, navigation, and ISR capabilities using satellites designed for long life and high reliability. Those life and reliability requirements are due in part to the high cost and limited availability of space launch. Current space systems require years to develop due to the complicated specialized design and manufacturing processes. The high cost of launching space assets, and competition with the commercial launch market, require launch scheduling years in advance. Moreover, once it has been scheduled on a launch vehicle, it may take several months to checkout and integrate into the launch vehicle and several additional months to become operational once it's in space. This existing capability is not operationally responsive.
This paper is an outgrowth of comments I heard and attitudes I experienced at the JFCOM Joint Space Concept Development and Experimentation Workshop in Norfolk at the end of March 2004. I presented a briefing on near-space at the conference along with colleagues from JFCOM, the Army Space and Missile Defense Battlelab, the Naval Research Laboratory, and the Navy Warfare Development Command. It discussed how many functions that are currently done with satellites could be performed for tactical and operational commanders using near-space assets much more cheaply and with much greater operational utility. The briefing was very well received with nothing but positive comments all around. However, once we broke into focus groups trying to develop exercise inputs for such subjects as operationally responsive space, the near-space concept was almost forgotten. It didn't fit into the normal mindset of what space meant, so it was difficult to convince other group members that it should be discussed in the same breath as, say, a TacSat-type program. After much thought, it was my perception that the problem was one of mindset as to what the word "space" meant to the warfighter. After reading space doctrine (Army, Navy, Air Force, and Joint), I discovered that the mindset I sensed at the workshop had actually been codified to define space as a place where we operate satellites. That mindset is counterproductive.
Space has become a critical part of the United States' warfighting capability and requires that future space systems become more responsive than the current systems of reusable and expendable launch vehicles. The US military relies on space assets for communication, navigation, and intelligence, surveillance, and reconnaissance. Our adversaries also recognize our reliance on space technology and are moving forward to deny us the use of those systems. To reduce our vulnerability to those threats, the United States must have the ability to responsively replace, supplement, and service its space assets. Although the development and operational use of systems that will support the evolving mission areas of space control and force application will be subject to political and fiscal leadership decisions, they will also require responsive spacelift capabilities and it is prudent to include those considerations in spacelift planning.
System Health Management: with Aerospace Applications provides the first complete reference text for System Health Management (SHM), the set of technologies and processes used to improve system dependability. Edited by a team of engineers and consultants with SHM design, development, and research experience from NASA, industry, and academia, each heading up sections in their own areas of expertise and co-coordinating contributions from leading experts, the book collates together in one text the state-of-the-art in SHM research, technology, and applications. It has been written primarily as a reference text for practitioners, for those in related disciplines, and for graduate students in aerospace or systems engineering. There are many technologies involved in SHM and no single person can be an expert in all aspects of the discipline.System Health Management: with Aerospace Applications provides an introduction to the major technologies, issues, and references in these disparate but related SHM areas. Since SHM has evolved most rapidly in aerospace, the various applications described in this book are taken primarily from the aerospace industry. However, the theories, techniques, and technologies discussed are applicable to many engineering disciplines and application areas. Readers will find sections on the basic theories and concepts of SHM, how it is applied in the system life cycle (architecture, design, verification and validation, etc.), the most important methods used (reliability, quality assurance, diagnostics, prognostics, etc.), and how SHM is applied in operations (commercial aircraft, launch operations, logistics, etc.), to subsystems (electrical power, structures, flight controls, etc.) and to system applications (robotic spacecraft, tactical missiles, rotorcraft, etc.).
The US Air Force Research Laboratory (AFRL) is currently supporting the joint Operationally Responsive Space (ORS) program with two aggressive research space programs. The goal of the ORS program is to improve the responsiveness of space capabilities to meet national security requirements. ORS systems aim to provide operational space capabilities as well as flexibility and responsiveness to the theater that do not exist today. ORS communication, navigation, and Intelligence, Surveillance and Reconnaissance (ISR) satellites are being designed to rapidly meet near term space needs of in-theater tactical forces by supporting contingency operations, such as increased communication bandwidth, and ISR imagery over the theater for a limited period to support air, ground, and naval force missions. This paper will discuss how AFRL/RHA is supporting the ORS effort and describe the hardware and software being developed with a particular focus on the Satellite Design Tool (SDT). In an effort to further support the evolution of ORS technologies with Warfighter?s involvement, Star Technologies Corp recently started coordinating the integration of the TATOO Laboratory with a satellite robotics test bed. Accessible via the TATOO Lab, the robotics test bed will be used to demonstrate and evaluate leading edge satellite technologies, such as Guidance Navigation and Control, attitude control, formation flying, and plug-and-play electronics. The test bed will consist of a Mission Control Center with wireless control and telemetry, an exceptionally flat and smooth floor area, and two robotic satellite simulators equipped with "next generation" plug-and-play hardware.
Some vols. include supplemental journals of "such proceedings of the sessions, as, during the time they were depending, were ordered to be kept secret, and respecting which the injunction of secrecy was afterwards taken off by the order of the House."
Some vols. include supplemental journals of "such proceedings of the sessions, as, during the time they were depending, were ordered to be kept secret, and respecting which the injunction of secrecy was afterwards taken off by the order of the House".