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This report outlines the vital mission of the Time and Frequency Lab at APL to provide precise time and frequency support for critical APL projects. Key contributions include maintaining traceability to U.S. and international timing laboratories and supporting notable space science missions such as NEAR, TIMED, MESSENGER, and STEREO. The lab engages in high stability frequency reference development, flight hardware and ground system development, and space qualification testing. The report highlights the modernization efforts, including advanced measurement systems and time dissemination methodologies essential for mission success.
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Report from APLM. Miranian 43rd CGSIC Timing Subcommittee March 11, 2004
Mission Provide precise time and frequency in support of critical APL projects and maintain traceability to U.S. and international timing laboratories.
APL Space Science Missions • NEAR – Near Earth Asteroid Rendezvous • TIMED – Thermosphere Ionosphere Mesosphere Energetics and Dynamics • MESSENGER – MErcury Surface, Space ENvironment, GEochemistry, and Ranging
APL Space Science Missions(continued) • STEREO – Solar TErrestrial RElations Observatory • New Horizons
APL Project Support • High Stability Frequency References • Flight Hardware Development • Flight Ground System Development • Space Qualification Testing • Reference to APL’s Satellite Tracking Facility
APL Project Support (continued) • Precise Time Code Signals • Satellite Propulsion Maneuvers • Time Tagging Spacecraft Telemetry Frames
Time and Frequency Dissemination • 1 MHz, 5 MHz, 10 MHz, 100 MHz • 1 PPS • IRIG-B APL Local Time • IRIG-B UTC • Common View GPS Time Transfer • NIST, USNO, BIPM
Time and Frequency Lab Hardware • 3 High Performance Caesium Standards • 2 Hydrogen Masers • Additional 2 on order • 5 MHz measurement system • 1 PPS clock monitor system
Summary • Support R&D and Operations at APL • Complete Modernization Effort • Maintain Traceability to US and International Standards
