Method of detecting interference in a satellite radio-navigation signal based on the monitoring of a temporal correlation coefficient

Method, implemented by a radio-navigation signals receiver comprising a correlator and an interference detector, for detecting interference in a received satellite radio-navigation signal, comprising the steps of:

• determining, at the correlator, a temporal position for which a correlation between a local spreading code and said received signal shifted by said position is maximum;
• calculating, at the correlator, a first measurement of a correlation between said local spreading code and said received signal shifted by a first temporal position advanced relative to the temporal position of said maximum by a first duration greater than a duration of a slot of the spreading code;
• calculating, at the correlator, a second measurement of a correlation between said local spreading code and said received signal shifted by a second temporal position delayed relative to the temporal position of the said maximum by a second duration greater than a duration of the slot of the spreading code;
• calculating, at the interference detector, an item of information representative of an intercorrelation between at least said first measurement and said second measurement;
• and
• comparing, at the interference detector, the said item of information with a detection threshold configured at least as a function of a ratio of powers of the signal and of the interference, and producing, from said comparison, an information on the presence or absence of interference in the received satellite radio-navigation signal.