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Satellite Orbital Conjunction Reports Assessing Threatening Encounters in Space (SOCRATES)

Satellite Orbital Conjunction Reports Assessing Threatening Encounters in Space (SOCRATES) . Dr. T.S. Kelso and Dr. Sal Alfano Center for Space Standards and Innovation. Overview. Introduction Background Methodology Demonstration Conclusions. Introduction.

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Satellite Orbital Conjunction Reports Assessing Threatening Encounters in Space (SOCRATES)

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  1. Satellite Orbital Conjunction Reports Assessing Threatening Encounters in Space (SOCRATES) Dr. T.S. Kelso and Dr. Sal Alfano Center for Space Standards and Innovation

  2. Overview • Introduction • Background • Methodology • Demonstration • Conclusions

  3. Introduction • Many operators are aware of the possibility of a collision between their satellite and another object • Few are aware of the frequency of occurrences • No central source of conjunction information • Problem is further confounded by lack of • Timely, comprehensive orbital data (including covariance) • Standard software • Computationally efficient algorithms

  4. Introduction • Result • Hundreds of conjunctions within 1 km go unreported each week • Billions of dollars of space hardware—and their associated missions—are put at risk

  5. Background • Center for Space Standards & Innovation (CSSI) offers SOCRATES conjunction advisory service • Each day, CSSI runs all payloads (active and inactive) against all objects on orbit • 2,686 payloads vs. 8,593 objects (as of 2005 Aug 17) • Limited to public access TLEs (no active DOD satellites) • Full catalog would be 2,954 payloads vs. 9,379 objects • Provides daily, searchable reports via CelesTrak • Reports and associated data used to produce them are freely available to the public

  6. Methodology • CSSI uses: • Standard data sources: NORAD two-line element sets • Standard orbital models: NORAD SGP4/SDP4 • COTS software: Satellite Tool Kit with STK/CAT (Conjunction Analysis Tools) • CSSI produces daily STK/CAT runs reporting: • Minimum distance at time of closest approach (TCA) • Maximum probability of collision • Coming: First-order estimate of true probability of collision

  7. Methodology • Capability now exists to build full STK scenarios on the fly directly from SOCRATES reports • Provides quick, easy way to incorporate all aspects of a particular conjunction into a 3-D framework for additional analysis • Allows user to easily incorporate higher quality data, if available • Flows directly into other space operations analysis, such as maneuver planning

  8. Demonstration • Easy to find from CelesTrak home page • Click on link for SOCRATES • Provides basic information along with: • Top 10 Conjunctions by Maximum Probability • Top 10 Conjunctions by Minimum Range • Search Capability

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  14. Conclusions • SOCRATES provides regular reports of satellite conjunctions using: • Standard, timely data (TLEs) • Standard orbital models (SGP4) • Extensible COTS software (STK) • Reports are freely available • Provides full-catalog SSA • Easy to use, computationally efficient • Raises awareness about this important space control issue

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