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Beacon Monitor Operations Experiment DS1 Technology Validation Report

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Beacon Monitor Operations Experiment DS1 Technology Validation Report Beacon Monitor Operations Experiment DS1 Technology Validation Report Dennis DeCoste, Susan G. Finley, Henry B. Hotz, Gabor E. Lanyi, Alan P. Schlutsmeyer, Robert L. Sherwood, Miles K. Sue, John Szijjarto, E. Jay Wyatt Jet Propulsion Laboratory California Institute of Technology Pasadena, California 91109 i Deep Space 1 Technology Validation Report—Beacon Monitor Operations Experiment Table of Contents Section Page Table of Contents..................................................................................................................................................... ii Figures ...................................................................................................................................................................... ii Tables........................................................................................................................................................................ ii Extended Abstract .................................................................................................................................................. iv Beacon Monitor Operations Experiment (BMOX)................................................................................................. 1 DS1 Technology Validation Report........................................................................................................................ 1 1.0 Introduction ........................................................................................................................................................ 1 2.0 Technology Description .................................................................................................................................... 1 2.1 What It Is/What It Is Supposed To Do.............................................................................................................................. 1 2.2 Key Technology Validation Objectives at Launch............................................................................................................ 3 2.3 Expected Performance Envelope....................................................................................................................................... 3 2.4 Detailed Description.......................................................................................................................................................... 5 2.5 Technology Interdependencies.......................................................................................................................................... 8 2.6 Test Program ..................................................................................................................................................................... 8 3.0 Technology Validation Summary ................................................................................................................... 10 3.1 Tone Experiment Results ................................................................................................................................................ 10 3.2 Data Summarization Results ........................................................................................................................................... 10 3.3 Operational Effectiveness Assessment............................................................................................................................ 12 3.4 Lessons Learned.............................................................................................................................................................. 15 4.0 Technology Application for Future Missions................................................................................................ 17 5.0 Acknowledgments ........................................................................................................................................... 18 6.0 List of References............................................................................................................................................ 18 Appendix A. List of Telemetry Channels and Names......................................................................................... 19 Appendix B. DS1 Technology Validation Power On/Off Times......................................................................... 21 Figures Figure Page Figure 1. Operational Concept .................................................................................................................................................... 1 Figure 2. Tone-Signal Structure .................................................................................................................................................. 2 Figure 3. Monitoring Signal Detector and Message Decoder ..................................................................................................... 5 Figure 4. Prioritized Summary Data Description........................................................................................................................ 7 Figure 5. ELMER Adaptive Alarm Limits.................................................................................................................................. 7 Figure 6. 1-sec Fourier Spectra of the Input Signals to the Four-Tone Detectors....................................................................... 8 Figure 7. Fourier Spectra of the Output of the Tone-Detectors after Aligning and Summing (and averaging) 10 FFTs of 1-sec Each............................................................................................................................... 9 Figure 8. Tracking of Adaptive Alarm Limit to DS1 Solar Array Temperature ....................................................................... 13 Figure 9. Battery Temperature Episode Detection.................................................................................................................... 13 Tables Page Page Table 1. Tone Definitions............................................................................................................................................................ 2 Table 2. BMOX Validation Summary ........................................................................................................................................ 4 Table 3. Summarization Telemetry Packets................................................................................................................................ 7 Table 4. BMOX Validation Schedule and Matrix..................................................................................................................... 10 Table 5. List of Tone Experiments............................................................................................................................................ 11 Table 6. Summary of Engineering Data Monitored .................................................................................................................. 12 Table 7. Tracking Cost Per Month (34m BWG, 2 contacts per week)...................................................................................... 15 ii Deep Space 1 Technology Validation Report—Beacon Monitor Operations Experiment EXTENDED ABSTRACT sensor channels at a much lower sample-rate. The software can use either traditional (static) alarm thresholds or The Beacon Monitor Operations Experiment (BMOX) was adaptive alarm-limit functions that are determined by a one of twelve new technologies that were flight validated on statistical learning network. The adaptive alarm-limit NASA’s Deep Space 1 Mission (DS1). The technology technology, called the Envelope Learning and Monitoring enables a spacecraft to routinely indicate the urgency of using Error Relaxation (ELMER) is one of two artificial ground contact using a tone signal rather than telemetry intelligence (AI) components in the current software design. while also summarizing onboard data to be transmitted The second AI-based method computes empirical whenever telemetry contact is required. This technology can transforms on individual data channels. These pseudo- be used to lower operational cost, decrease mission risk, and sensors enhance the value of summaries and serve as an decrease loading on the over-constrained Deep Space additional input in determining the adaptive limits. The Network antennas. The technology is baselined on software was originally developed to support Beacon upcoming NASA missions to Europa, Pluto, and the Sun. monitor operations, an approach that enables the spacecraft Successful flight validation has met a requirement to to determine when ground contact is necessary. In this demonstrate the technology before routine use on the approach, summarization plays a key role in providing Europa mission. operators with the most important data because all of the stored data cannot be downlinked in a single telemetry pass. The end-to-end, Beacon-tone signaling system was Efficient summaries also help facilitate quick developed to provide a low-cost and low-bandwidth method troubleshooting and thus can reduce the risk of losing the for determining when ground intervention is required. With mission. Summarization algorithms can also be applied to Beacon monitoring, the spacecraft sets the tone signal and it nonspace systems to decrease the time required to perform is transmitted either in a scheduled manner or continuously, data analysis. The current version of the software runs on depending on spacecraft operability constraints. The
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