Method and system for providing assistance to geolocation of node devices of an asynchronous rf network

System for providing assistance to geolocation of at least one node device of an asynchronous radio frequency (RF) network by implementing at least one transceiver, each of said at least one node device comprising a global satellite navigation system (GNSS) receiver, and the asynchronous RF network being connected through at least one transceiver acting as a gateway to a backend network which houses an A-GNSS server, the system being designed for implementing a method for providing assistance to geolocation of said at least one node device, the method comprising the steps consisting in:

• at the level of said GNSS receiver of said at least one node device:
• receiving at least three GNSS signals from visible GNSS satellites,
• computing data proportional to at least two time of arrival differences between receptions of predetermined signal sequences of said at least three GNSS signals taken in pairs;
• generating a data packet comprising said data proportional to said at least two time of arrival differences, and
• asynchronously emitting the data packet towards said at least one transceiver;
• and
• at the level of said at least one transceiver:
• receiving said data packet;
• and
• adding a time-stamp to said data packet for generating a time-stamped data packet,
• emitting said time-stamped data packet toward a A-GNSS server,
• at the level of said at least one transceiver acting as a gateway:
• sending said time-stamped data packet to said A-GNSS server,
• at the level of said A-GNSS server:
• receiving said time-stamped data packet,
• extracting the time-stamp and said data proportional to said at least two time of arrival differences from said time-stamped data packet,
• for at least one time of arrival difference, determining the time-of-day at which data proportional to said at least one time of arrival difference have been computed by said at least one node device in function of the extracted data among which at least the extracted time-stamp, and
• determining the geographic position of said at least one node device in function of at least the determined time-of-day and said data proportional to said at least two time of arrival differences.