Lockheed Martin Space Advanced Programs Requirements in NASA Science Missions © 2019 Lockheed Martin. All Rights Reserved Performance and Operational Measurement Requirements Emitted radiance Detect photons; Convert to e- Calibrate Data Science Data Quantized Photons Electrons Science Data Radiances § Orbit § Wavelength band § Detection § Science question § Signal photons § Integration time § Navigation analysis § Background scene § Quantum efficiency § Radiometric calibration § Field of View § Dark current § Resolution § Read noise § Solar intrusion Mission Requirements Performance Requirements • Duration • Environment • Electrical • Mechanical Iterate • Reliability • Operational • Thermal • Structural Evolve Requirements Constraints Resource Requirements • Spacecraft • Mass • Thermal interface • Power • Data rate • Launch vehicle • Size • Alignment Concept Design 2 Example Requirements Tree Implementing NASA Level 1s Institution/NASA Center Level 1 Reqts Program Level 2 Launch Environmental Mission Assurance Mission Reqts Doc Project Vehicle IRD Reqts Requirements (MAR) Flight System Level 3 Mission Ops & Element- Payload Spacecraft Flight to Ground Payload Reqts to SC ICDs Ground Developed, Requirements Doc ICD System Reqts Project Approved Payload/ Level 4 Spacecraft Ground Instrument Testbeds Element-Controlled Subsystems Subsystems Subsystems 3 Mars Atmosphere and Volatile EvolutioN (MAVEN) v Objective: Characterize Mars’ atmospheric escape v PI: Dr. Bruce Jakosky, CU LASP v Implementing Institution: NASA Goddard Space Flight Center v Spacecraft and Mission Ops: Lockheed Martin v Instruments: UCB SSL, CU/LASP, NASA GSFC, CNES v Mars relay: Jet Propulsion Laboratory v Launched November 18th 2013 v MOI September 22nd 2014 v Currently in third mission extension Image Credit: NASA/B. Ingalls 5 Science Missions Across the Solar System 6 © 2019 Lockheed Martin. All Rights Reserved.