RADIO GUIDANCE METHODS AND SYSTEMS IN NON-COOPERATIVE ENVIRONMENTS

The invention relates to a proximity detection and radio guidance system comprising - a radio transmitter capable of transmitting a plurality of differently spread signals; - a user device capable of * measuring, at different positions with respect to the radio transmitter, the power of the received signal and the signal-to-noise ratio relating to each transmitted signal of said plurality of signals; * calculating a first statistical value of the powers of the received signals at each measurement position; * calculating a second statistical value of the signal-to-noise ratios relating to the signals received at each measurement position; * calculating, on the basis of the calculated statistical values, a proximity index of the radio transmitter from each position; and * calculating a gradient vector of the proximity index.