Observation and Checkout Modes (1) - Introduction -

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Presentation transcript:

Observation and Checkout Modes (1) - Introduction - Initial in-orbit checkout period (60 days?) Engineering checkout (? days) Science instrument calibration (60 days?) During operation Engineering Mode Science Observation Modes Sky survey mode Pointed observation mode Safe mode

Observation and Checkout Modes (2) - Introduction - OPERATIONS CONCEPT DOCUMENT (433-OPS-0001)

Observation and Checkout Modes (3) - Introduction - Sky Survey Mode Sky survey mode is basically zenith pointed throughout the orbit and has two sub modes: with rocking, and without rocking. Rocking provides for more uniform sky coverage and allows for complete sky coverage within a shorter period of time. Different rocking profiles may be implemented, (square, sinusoid) with a basic 2-orbit period and a 60-degree maximum amplitude (above and below the orbit plane). Observations are uninterrupted by downlink transmission of science data in this mode. Pointed Observation Mode Target Inertial maintains the Z-axis on the target to within the 2 degree control capability of the spacecraft. This mode may be interrupted for downlink transmissions of science data. Earth avoidance is accomplished in this mode via stored commands that keep the field of view on the sky while the target is occulted. Must to be changed Repointed Observation Mode By command (TOO) and Autonomous (GRB)

Observation and Checkout Modes (4) - Initial Checkout Period - All TBD: I&T and IOC will collect solicit inputs from all subsystems

Observation and Checkout Modes (5) - Engineering Mode -

Observation and Checkout Modes (6) - Survey Mode -

Observation and Checkout Modes (7) - Orbit -

Observation and Checkout Modes (8) - Specifications - Will be addressed in Session by Steve Ritz

Observation and Checkout Modes (9) - Pointed Mode - Mutually contradicting. Probably need to be changed Can we maintain 90% observation Efficiency in Pointed Mode?

Observation and Checkout Modes (10) - Thermal Constraints -

Observation and Checkout Modes (11) - Typical Orbits and Attitude Changes -

Observation and Checkout Modes (12) - Typical Orbits and Attitude Changes -