METRIC is a proposed mission that aims to improve the knowledge of atmospheric density, general relativity and geodesy. The mission foresees a small spherical satellite placed in a polar eccentric orbit, with the apogee at 1200 km of altitude and perigee at 450 km. The spacecraft will be tracked from ground and space and have an onboard accelerometer. The last one will measure nongravitational accelerations (namely due to drag and solar radiation pressure). A dynamical simulator has been implemented with known models (e.g. gravitational model, NRLMSISE00), so that, through some simulations, it’s possible to estimate the nongravitational accelerations acting on the satellite. These are then analyzed in order to extract their principal characteristics: intensity and frequency spectrum. In this way accelerometer’s features  dynamic range, required accuracy and frequency bandwidth can be determined in order to have useful measurements. The data collected by the accelerometer will be used, also with POD data that comes from tracking, to improve the models of atmospheric density and general relativity.
METRIC is a proposed mission that aims to improve the knowledge of atmospheric density, general relativity and geodesy. The mission foresees a small spherical satellite placed in a polar eccentric orbit, with the apogee at 1200 km of altitude and perigee at 450 km. The spacecraft will be tracked from ground and space and have an onboard accelerometer. The last one will measure nongravitational accelerations (namely due to drag and solar radiation pressure). A dynamical simulator has been implemented with known models (e.g. gravitational model, NRLMSISE00), so that, through some simulations, it’s possible to estimate the nongravitational accelerations acting on the satellite. These are then analyzed in order to extract their principal characteristics: intensity and frequency spectrum. In this way accelerometer’s features  dynamic range, required accuracy and frequency bandwidth can be determined in order to have useful measurements. The data collected by the accelerometer will be used, also with POD data that comes from tracking, to improve the models of atmospheric density and general relativity.
Determination of onboard accelerometer's characteristics for METRIC mission
ANESE, GIOVANNI
2021/2022
Abstract
METRIC is a proposed mission that aims to improve the knowledge of atmospheric density, general relativity and geodesy. The mission foresees a small spherical satellite placed in a polar eccentric orbit, with the apogee at 1200 km of altitude and perigee at 450 km. The spacecraft will be tracked from ground and space and have an onboard accelerometer. The last one will measure nongravitational accelerations (namely due to drag and solar radiation pressure). A dynamical simulator has been implemented with known models (e.g. gravitational model, NRLMSISE00), so that, through some simulations, it’s possible to estimate the nongravitational accelerations acting on the satellite. These are then analyzed in order to extract their principal characteristics: intensity and frequency spectrum. In this way accelerometer’s features  dynamic range, required accuracy and frequency bandwidth can be determined in order to have useful measurements. The data collected by the accelerometer will be used, also with POD data that comes from tracking, to improve the models of atmospheric density and general relativity.File  Dimensione  Formato  

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https://hdl.handle.net/20.500.12608/39996