Navigation during a deception operation of a satellite signal receiver

A navigation method by means of a satellite signal receiver embedded in a vehicle comprising an electronic navigation unit connected to the satellite signal receiver and to an inertial positioning unit for computing a primary operational navigation that is hybridized on the basis of inertial positioning data and satellite positioning data by applying an innovation test, the method comprising the step of controlling the vehicle according to the primary operational navigation and the following steps of:

• computing a first reference navigation that is hybridized on the basis of inertial positioning data with positional corrections determined on the basis of satellite positioning data;
• recovering positional corrections in latitude and in longitude provided by the first reference navigation;
• performing a statistical analysis of the positional corrections in latitude and in longitude provided by the first reference navigation and deducing therefrom the existence or the absence of a deception operation of the satellite signal receiver;
• and
• emitting an alert in case of detection of a deceiving operation,
• wherein the statistical analysis comprises the computing of a correlation coefficient between the positional corrections in latitude and the positional corrections in longitude provided by the first reference navigation, and the comparison of the correlation coefficient to a second predetermined threshold to distinguish the existence of a deception operation and the absence of a deception operation.

A navigation method by means of a satellite signal receiver embedded in a vehicle comprising an electronic navigation unit connected to the satellite signal receiver and to an inertial positioning unit for computing a primary operational navigation that is hybridized on the basis of inertial positioning data and satellite positioning data by applying an innovation test, the method comprising the step of controlling the vehicle according to the primary operational navigation and the following steps of:

• computing a first reference navigation that is hybridized on the basis of inertial positioning data with positional corrections determined on the basis of satellite positioning data;
• recovering positional corrections in latitude and in longitude provided by the first reference navigation;
• performing a statistical analysis of the positional corrections in latitude and in longitude provided by the first reference navigation and deducing therefrom the existence or the absence of a deception operation of the satellite signal receiver;
• and
• emitting an alert in case of detection of a deceiving operation,
• wherein the statistical analysis comprises the determination of successive correction directions on the basis of positional corrections in latitude and positional corrections in longitude provided by the first reference navigation, the computing of a variability coefficient of the correction directions and the comparison of the variability coefficient to a third predetermined threshold to distinguish the existence of a deception operation and the absence of a deception operation.

A navigation method by means of a satellite signal receiver embedded in a vehicle comprising an electronic navigation unit connected to the satellite signal receiver and to an inertial positioning unit for computing a primary operational navigation that is hybridized on the basis of inertial positioning data and satellite positioning data by applying an innovation test, the method comprising the step of controlling the vehicle according to the primary operational navigation and the following steps of:

• computing a first reference navigation that is hybridized on the basis of inertial positioning data with positional corrections determined on the basis of satellite positioning data;
• recovering positional corrections in latitude and in longitude provided by the first reference navigation;
• performing a statistical analysis of the positional corrections in latitude and in longitude provided by the first reference navigation and deducing therefrom the existence or the absence of a deception operation of the satellite signal receiver;
• emitting an alert in case of detection of a deceiving operation;
• estimating on the basis of the first reference navigation, sensor errors of the inertial positioning unit;
• comparing the error estimation of each sensor to a predetermined threshold;
• and
• emitting the alert according to the number of threshold exceedings, the probability of existence of a deception operating being proportional to the number of exceedings.

A navigation method by means of a satellite signal receiver embedded in a vehicle comprising an electronic navigation unit connected to the satellite signal receiver and to an inertial positioning unit for computing a primary operational navigation that is hybridized on the basis of inertial positioning data and satellite positioning data by applying an innovation test, the method comprising the step of controlling the vehicle according to the primary operational navigation and the following steps of:

• computing a first reference navigation that is hybridized on the basis of inertial positioning data with positional corrections determined on the basis of satellite positioning data, positional correction being computed between a purely inertial position computed on the basis of inertial positioning data and a purely satellite position computed on the basis of satellite positioning data;
• recovering positional corrections in latitude and in longitude provided by the first reference navigation;
• performing a statistical analysis of the positional corrections in latitude and in longitude provided by the first reference navigation and deducing therefrom the existence or the absence of a deception operation of the satellite signal receiver;
• and
• emitting an alert in case of detection of a deceiving operation.