While ground-based spacecraft radio tracking is a well-established technique, the use of miniaturized space-to-space inter-satellite links, capable of determining the Doppler shift due to the relative line-of-sight velocity between two spacecraft, has not been explored frequently in the past. The satellite-to-satellite tracking option allows to increase the accuracy of the results for both planetary bodies’ mass and gravity field determination as well as S/C positioning. In this work, the Hera mission inter-satellite link is described and characterized. Preliminary laboratory test results show that the system meets the end-to-end range-rate requirements for gravity science investigations. Furthermore, this work presents numerical simulations of the Hera gravity science experiments. The orbit determination results demonstrate that the inter-satellite Doppler measurements are crucial for the characterization of the extended gravity field of Didymos, whose spherical harmonics coefficients can be estimated up to the degree 3 with the current concept of operations.

Hera Inter-Satellite link Doppler characterization for Didymos Gravity Science experiments

Gramigna E.
;
Lasagni Manghi R.;Zannoni M.;Tortora P.;Togni A.
2022

Abstract

While ground-based spacecraft radio tracking is a well-established technique, the use of miniaturized space-to-space inter-satellite links, capable of determining the Doppler shift due to the relative line-of-sight velocity between two spacecraft, has not been explored frequently in the past. The satellite-to-satellite tracking option allows to increase the accuracy of the results for both planetary bodies’ mass and gravity field determination as well as S/C positioning. In this work, the Hera mission inter-satellite link is described and characterized. Preliminary laboratory test results show that the system meets the end-to-end range-rate requirements for gravity science investigations. Furthermore, this work presents numerical simulations of the Hera gravity science experiments. The orbit determination results demonstrate that the inter-satellite Doppler measurements are crucial for the characterization of the extended gravity field of Didymos, whose spherical harmonics coefficients can be estimated up to the degree 3 with the current concept of operations.
Hera Inter-Satellite link Doppler characterization for Didymos Gravity Science experiments
430
435
Gramigna E.; Johansen J.G.; Lasagni Manghi R.; Magalhaes J.; Zannoni M.; Tortora P.; Bras E.L.; Togni A.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/895451
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