15 October 2012 Evolving high fidelity climate sensor simulators to preserve climate data record continuity
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Abstract
Six CERES scanning radiometers have flown to date. The Proto-­‐Flight Model flew aboard the Tropical Rainfall Measuring Mission spacecraft in November 1997. Two CERES instruments, Flight Models (FM) 1 and 2, are aboard the Terra spacecraft, which was launched in December 1999. Two more CERES instruments, FM-­‐3 and FM-­‐4, are on the Aqua spacecraft, which was placed in orbit in May 2002. These instruments continue to operate after providing over a decade of Earth Radiation Budget data. FM-­‐5 is onboard the NPP spacecraft and launched in October 2011. FM-­‐6 is being built for use on the JPPS spacecraft. A successor to these CERES instruments is presently in the definition stage. This paper describes the role of instrument simulators in the life cycle of the CERES instruments and how the simulators may be modified to better represent the instrument and its operations. NASA LaRC originally built the CERES instrument simulators. They were created to test CERES flight loads and view the resulting instrument response. The simulator’s interface to the instrument processor and spacecraft bus enables the verification of all software modifications, which are uploaded to orbiting instruments. The simulators were recently redesigned to provide additional functionality, however not all instrument operations are completely replicated. The existing simulator software provides the necessary stubs to incorporate modifications and improvements. One possible upgrade is a simulation to imitate the CERES detector assembly. Another useful enhancement is fault injection into select instrument systems, to simulate operational failures and resolve anomaly situations. Many features could be added to the simulator, all of which can ultimately improve instrument performance.
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Kelly K. Teague, G. Louis Smith, Kory Priestley, "Evolving high fidelity climate sensor simulators to preserve climate data record continuity", Proc. SPIE 8510, Earth Observing Systems XVII, 85101P (15 October 2012); doi: 10.1117/12.930233; https://doi.org/10.1117/12.930233
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