Transient and Microvibrations Control for Optical Missions in Combination with Rf Instrument - Expro Plus

• Country: Netherlands
• Summary: Transient and Microvibrations Control for Optical Missions in Combination with Rf Instrument - Expro Plus
• NLT Ref No: 90116314
• Deadline: 02 Nov 2023
• Financier: Agency for the Cooperation of Energy Regulators (ACER)
• Purchaser Ownership: Government
• Tender Value: Refer Document
• Notice Type: Tender
• Document Ref. No.: 1-11980
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• Description:
• Transient and Microvibrations Control for Optical Missions in Combination with Rf Instrument - Expro Plus To develop a control architecture to mitigate dynamic transients and pointing microvibrations forOptical missions combined with RFinstrument or other mechanism, to enable high pointing stabilityat limited cost.DescriptionEarth Observation optical missions combined with RF instrument (e.g. future LEO meteo missions,possibly with optical and microwave instruments, or embarking several instruments, or STREAMmission) or with other mechanism will face challenging pointing stability, from demanding opticalrequirements and critical mechanism microvibration, from large rotating antenna or steerableantenna.Based on recent RD activities outcomes, a new type of attitude control architecture shall improvethe pointing performance of such combined missions at limited cost since based on controltechniques to be implemented in attitude control subsystem. This solution shall be able to mitigatetogether the rotating antenna static and dynamic imbalances or steerable antenna perturbation, withthe flexible modes excitation and the Solar Array Drive Mechanism (SADM) disturbance, and withpossibility to extend it to other platform mechanism microvibration at the same time. This newsystem will benefit from the use of harmonic control with harmonics identification which enablesvery high rejection performance on several harmonics while having relaxed constraints on theprocessing for reduced electronic cost. As well as from the Proof-Mass Actuators (PMAs) directlyaccommodated on the Platform which enable to manage all disturbances together. The outcomeof this activity is a detailed design and analysis of new type of microvibration control architecture,to be defined for EO Optical mission usecases (eg. missions with combined Optical and RFinstruments - future LEO meteo missions STREAM- and missions with important mechanismperturbation (e.g. using steerable antennas).This activity encompasses the following tasks:- Definition of the mission (mission and system requirements, dynamic properties,disturbances, accommodation capacity)- System architecture definition including: requirements flow-down, sensors accommodationand selection trade-offs, PMA actuators sizing and accommodation on the platform,preliminary design of the system state estimation and controller (based on use of harmoniccontrol) with high tolerance to delays and knowledge error, and limited sampling frequencyby design- Detailed design with system modelling (full dynamics, disturbances with static dynamicimbalances and coupling effects, sensors, actuators, controller, system delays), controllerdetailed design and robusttuning- Detailed simulations and analysis of the control system performance, with sensitivityperformance analysis for each of thedisturbances- Detailed conclusion, with quantitative synthesis on the performance and programmatic gainfor using such architecture and techniques in future missions
• Documents:

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