Method for determining a wrong synchronization of a receiver with a satellite, associated receiver and computer program product

A receiver configured to determine a wrong synchronization with a satellite during an acquisition phase for acquiring a navigation signal from this satellite, the satellite being part of a global navigation satellite system, the navigation signal comprising only one data channel including an item of navigation information modulated by a data spreading code specific to this satellite and carried by a carrier wave;

• during the acquisition phase, the receiver being configured to receive the navigation signal transmitted by the satellite, and to generate a local image of the data spreading code and a local image of the carrier wave;
• the receiver being configured to implement after the acquisition phase a convergence phase;
• the receiver comprising a detection module being configured, during the convergence phase, to:
• generate a first test signal comprising the local image of the carrier wave and a first test spreading code, and a second test signal comprising the local image of the carrier wave and a second test spreading code;
• the first and second test spreading codes being codes whose sum corresponds to the local mage of the data spreading code;
• for each correlation interval of a plurality of correlation intervals, determine a first prompt correlator corresponding to a correlation value between the received signal and the first test signal, and a second prompt correlator corresponding to a correlation value between the received navigation signal and the second test signal;
• determine first and second energy values corresponding to an energy of the first and second prompt correlators, respectively, over all of the correlation intervals;
• determine a wrong synchronization indicator based on the difference between the first and second energy values;
• determine a wrong synchronization when the wrong synchronization indicator is above a predetermined threshold.