Proposed evolution of CCSDS protocols - strategy and technology
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CCSDS protocols↗
Engineering topics
Carper, Richard D.
Publications and source records attributed to Carper, Richard D..
The NASA Mission Operations and Control Architecture Program
The conflict between increases in space mission complexity and rapidly declining space mission budgets has created strong pressures to radically reduce the costs of designing and operating spacecraft. A key approach to achieving such reductions is through reducing the development and operations costs of the supporting mission operations systems. One of the efforts which the Communications and Data Systems Division at NASA Headquarters is using to meet this challenge is the Mission Operations Control Architecture (MOCA) project. Technical direction of this effort has been delegated to the Mission Operations Division (MOD) of the Goddard Space Flight Center (GSFC). MOCA is to develop a mission control and data acquisition architecture, and supporting standards, to guide the development of future spacecraft and mission control facilities at GSFC. The architecture will reduce the need for around-the-clock operations staffing, obtain a high level of reuse of flight and ground software elements from mission to mission, and increase overall system flexibility by enabling the migration of appropriate functions from the ground to the spacecraft. The end results are to be an established way of designing the spacecraft-ground system interface for GSFC's in-house developed spacecraft, and a specification of the end to end spacecraft control process, including data structures, interfaces, and protocols, suitable for inclusion in solicitation documents for future flight spacecraft. A flight software kernel may be developed and maintained in a condition that it can be offered as Government Furnished Equipment in solicitations. This paper describes the MOCA project, its current status, and the results to date.
Ondrus, Paul J.↗
NASA/Goddard Space Flight Center's testbed for CCSDS compatible systems
A testbed for flight and ground systems compatible with the Consultative Committee for Space Data Systems (CCSDS) Recommendations has been developed at NASA's Goddard Space Flight Center. The subsystems of an end-to-end CCSDS based data system are being developed. All return link CCSDS telemetry services (except Internet) and both versions of the CCSDS frame formats are being implemented. In key areas of uncertainty, multiple design approaches are being performed. In addition, key flight-qualifiable hardware components, such as Reed-Solomon encoders, are being developed to complement the testbed element development. The testbed and its capabilities are described. The method of dissemination of the testbed results are given, as are plans to make the testbed capabilities available to outside users. Plans for the development of standardized conformance and compatibility tests are provided.
Carper, Richard D.↗
CCSDS telemetry systems experience at the Goddard Space Flight Center
NASA Goddard Space Flight Center (GSFC) designs, builds, manages, and operates science and applications spacecraft in near-earth orbit, and provides data capture, data processing, and flight control services for these spacecraft. In addition, GSFC has the responsibility of providing space-ground and ground-ground communications for near-earth orbiting spacecraft, including those of the manned spaceflight programs. The goal of reducing both the developmental and operating costs of the end-to-end information system has led the GSFC to support and participate in the standardization activities of the Consultative Committee for Space Data Systems (CCSDS), including those for packet telemetry. The environment in which such systems function is described, and the GSFC experience with CCSDS packet telemetry in the context of the Gamma-Ray Observatory project is discussed.
Carper, Richard D.↗
Data standards for the Space Station Freedom Program
The Space Station Freedom Program (SSFP) plans to utilize several of the Recommendations of the Consultative Committee for Space Data Systems (CCSDS). This paper discusses four aspects of the effect of the Advanced Orbiting Systems (AOS) within the SSFP which are of special interest. It is first noted that the AOS is a new Recommendation of the CCSDS, and the SSFP has been in the unique position of playing a major role in the development of the Recommendation. Interactions of the process by the Program and the CCSDS are shown. Second, the specific application of the CCSDS AOS Recommendation to each of the four SSFP flight elements and the resulting sets of services provided on each element are discussed. Third, the usefulness and importance of the AOS Recommendation within the context of the international nature of the SSFP and as part of the generation of interorganizational support agreements within NASA are discussed. Finally, the current status of baselining various CCSDS Recommendations, especially the AOS, into the SSFP requirements structure is given.
Carper, Richard D.↗
Flight and ground packet telemetry systems activities at NASA's Goddard Space Flight Center
NASA's Goddard Space Flight Center (GSFC) has the responsibility for the telemetry ground data processing for two current spacecraft which use packet telemetry. These spacecraft are the Hubble Space Telescope (HST) and the Gamma Ray Observatory (GRO). GSFC has designed and built two ground systems to meet this responsibility. The first is the HST DATA Capture Facility (DCF), which has now completed its integration and test phase and is supporting spacecraft and data flow tests. The second is the Packet Processor System (Pacor). This system became operational in July 1987. These systems are known generally as Level Zero Processors. Level Zero Processors ingest telemetry composite bit streams, output selected user specific data in real time, and in a batch mode perform all necessary processing to produce individual user data files which are, within the limits of the quality of the received data, contiguous, complete, ordered and nonredundant.
Carper, Richard D.↗