Eutelsat S a

Geoffroy Brichler

Antonin Hirsch

Florian Collard

A method for the transmission to a non-geostationary satellite of data stored by a ground-based device being carried out by the device, includes entering an awaken mode, performing successive Doppler shift estimations: receiving, by the device during the awaken mode, a signal from the satellite including a frequency parameter and an elevation emission criterion, performing a Doppler shift estimation based on the frequency of the received signal; estimating a Doppler rate of frequency change to obtain a relative position of the device, defining a transmission window during which the position of the device relative to position of the satellite verifies the elevation emission criterion, and if the position of the device relative to the position of the satellite verifies the elevation emission criterion: emitting at the frequency parameter a signal including the data stored by the device.

Methods for the transmission of data between a resource constrained device and a non-geostationary satellite and associated system

A method for the transmission to at least one non-geostationary satellite of at least one piece of data stored by a ground-based device, the method being carried out by the non-geostationary satellite and including performing periodically at least one radio coverage measurement, computing a dynamic elevation emission criterion based on the last radio coverage measurement performed, emitting at least one signal periodically towards the Earth, the signal including at least the dynamic elevation emission criterion, if the position of the non-geostationary satellite relative to the position of the ground-based device verifies the dynamic elevation emission criterion: receiving at least one signal sent by the ground-based device, the signal including at least one piece of data stored by at least one ground-based device.

Methods for the transmission of data between a resource constrained device and a non-geostationary satellite and associated method

A method for the transmission to a non-geostationary satellite of data, each device storing data, carried out by each device, includes performing successive Doppler shift estimations including receiving, by the device, a signal from the satellite comprising at least one elevation emission criterion, performing a Doppler shift estimation based on the frequency of the received signal; estimating a Doppler rate of frequency change to obtain a position of the device relative to the position of the satellite, defining a transmission window during which the position of the device relative to position of the satellite verifies the elevation emission criterion, defining a transmission time included in the transmission window and defined randomly, emitting, at the transmission time, a signal including data stored by the device and the position of the device relative to the position of the satellite.

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ISSY-LES-MOULINEAUX, France

Geoffroy Brichler