Abstract: A method for locating a ground-based device using only one non-geostationary satellite, wherein Doppler measurements are extracted from received signals, and a plurality of computing iterations are performed, each computing iteration including defining a new geographical window having an area different from an area of a directly preceding geographical window, simulating Doppler curves for a plurality of positions inside the defined geographical window, training a machine learning model with the simulated Doppler curves associated with their position of emission, and obtaining a location of the ground-based device by inputting in the trained model the extracted Doppler measurements.

Abstract: 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.

Abstract: 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.

Abstract: A method for collecting at least one message received from at least one terminal, the method being performed on-board a satellite, includes receiving, continuously in time, a main signal over a main frequency band, sampling the received main signal, searching, in the samples of the main signal, a preamble signal emitted by the terminal, the preamble signal being included in a preamble frequency band, the preamble frequency band being included in the main frequency band, if a preamble signal has been found at the procedure of searching, storing data digital samples of at least one data signal in the memory of the satellite, the data signal being included within at least one data frequency band comprised in the main frequency band, the digital samples resulting from a sampling of the received signal within the data frequency band.

Abstract: 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.

Abstract: 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.