Detection module of a disturbance signal during initial receiving by a receiver of navigation information, receiver comprising such module, associated method and computer program product

A detection module for detecting a disturbance signal during initial receiving by a receiver of navigation information from one or several satellites belonging to a global satellite positioning system, the receiver including a plurality of elementary antennas able to receive, in a plurality of arrival directions, electromagnetic signals comprising navigation information, a forming unit able to form a resultant signal from the electromagnetic signals received by the elementary antennas, and a processing unit able to process the resultant signal to extract navigation information therefrom,

• the detection module comprising a plurality of correlators, each correlator being associated with an elementary antenna and being able to calculate, over a given time interval, a correlation value between each electromagnetic signal from the corresponding elementary antenna and a reply signal stored in the receiver, the reply signal being predetermined as a function of the satellite from which the navigation information is expected,
• wherein the detection module is integrated into the forming unit and able to receive the electromagnetic signals coming from each of the elementary antennas, analyze these signals and detect a disturbance signal when the receiver is started cold in case of detection of a favored arrival direction of some of the electromagnetic signals,
• wherein the detection module is further suitable for determining a given time interval, an inter-correlation matrix corresponding to the product of a first matrix made up of the correlation values determined for the same time interval from electromagnetic signals from different elementary antennas and different reply signals, and a second matrix equal to the first transposed conjugated matrix, and
• wherein the detection module is suitable for detecting a disturbance signal when the receiver is started cold when the determinant of each inter-correlation matrix from among a plurality of inter-correlation matrices determined for different consecutive time intervals is strictly below a predetermined threshold.