Method for locating a terminal at the surface of a coverage area by means of a telecommunication network using a multi-beam satellite

摘要

A method for locating a terminal in a coverage area using a telecommunication network, the network including a multi-beam satellite, the area including various cells, each associated with a beam for linking to the satellite to which a frequency band is assigned, the method including: performing the uplink transmission of a message incorporated into a modulated signal to the satellite at a frequency shared by three different uplink beams such that the message is received by the satellite with three different amplitudes; performing the downlink transmission of three modulated signals incorporating the message, the first, second, and third signals each corresponding to a different beam from among the three beams; receiving the first, second, and third signals; determining the amplitudes of the message within the first, second and third signals; and determining the location of the terminal from the amplitudes of the message within the first, second, and third signals.

主权项

1. Method for locating a terminal at the surface of a coverage area by means of a telecommunication network for establishing radiofrequency links, the network comprising a telecommunication multi-beam satellite having a plurality of beams, said multi-beam satellite comprising a multi-beam antenna, said coverage area comprising a plurality of cells, each cell being associated with at least one beam for linking to the satellite to which a frequency band is assigned, said method comprising:
performing an uplink transmission by the terminal of a message incorporated into a modulated signal to said multi-beam satellite at a frequency shared by at least three different uplink beams such that said message is received by said multi-beam satellite via said multi-beam antenna with three different amplitudes; performing a downlink transmission by the multi-beam satellite of three modulated signals incorporating said message, the first, second and third signals each corresponding to a different beam from among said three beams; receiving said first, second and third signals by a terrestrial receiver; determining the amplitudes of the message sent by the terminal incorporated into said first, second and third signals using a terrestrial calculation unit; and determining the location of said terminal from said amplitudes of said message incorporated into said first, second and third signals; wherein said message incorporated into said first signal is received by said terrestrial receiver with a greater amplitude than those of said message incorporated into the second and third signals, said method further comprising: demodulation by said terrestrial calculation unit of said first signal so as to recover the information relative to the following message: the payload of the message; and the emission and/or encoding parameters of said message; and using said information relative to the message to search for said message respectively in said second and third signals by said terrestrial calculation unit.