Positioning system with fraud detection mechanism for a critical application

• US 9,535,160 B2
• Filed: 03/28/2012
• Issued: 01/03/2017
• Est. Priority Date: 03/31/2011
• Status: Active Grant

• Current Assignee: Thales SA
• Original Assignee: Thales SA
• Inventors: Bardout, Yves
• Primary Examiner(s): LIU, HARRY K
• Application Number:
  US14/009,040
• Publication Number:
  US 20140292571A1
• Time in Patent Office: 1,742 Days
• Field of Search: 342/357.51
• US Class Current: 1/1
• CPC Class Codes: G01S 19/13 Receivers
• CPC Class Codes: G01S 19/215 issues related to spoofing
• CPC Class Codes: G07B 15/063 using wireless information transmission between the vehicle and a fixed station identification of vehicles G08G

Abstract

A positioning system comprises an onboard GNSS satellite receiver in a mobile element belonging to a user which estimates the position of said mobile element at various instants, a first processing module determining a consistency indicator by combining the estimated positions and data provided by secondary information sources, using a dynamic model of movement of the mobile elements to be positioned. The indicator is determined by comparing a speed, acceleration, gyration triplet derived from direction and velocity measurements taken by the mobile element, to a dynamic model of movement of an object, vehicle, person or animal to be positioned. The system comprises a consolidation module containing means storing the positions estimated at various instants, a digital filter to obtain a filtered position from the stored positions of a user, the consistency indicator calculated from filtered positions; and detection means determining from the consistency indicator whether the estimated positions are falsified.

Claims

1. A positioning system comprising:

at least one onboard GNSS satellite receiver in a mobile element belonging to a user u, said receiver having a function of estimating a position Xu of said mobile element at various instants, and

a first processing module determining a consistency indicator coh(X) by combining the estimated positions Xu[t] and data provided by secondary information sources, a dynamic model of movement of the mobile elements to be positioned being used, said indicator being determined by comparing a speed, acceleration, gyration [v, a, g] triplet derived from direction and velocity measurements taken by the mobile element, to a dynamic model of movement of an object, vehicle, person or animal to be positioned, the system further comprising;

a consolidation module containing means for storing the positions Xu[t] estimated at various instants t by user u,

a digital filter configured to obtain a filtered position Xf[t] from the stored positions Xu[t] of the user, the consistency indicator coh(X) being calculated from the filtered positions Xf[t], and

the system also contains detection means for determining from the consistency indicator coh(X) whether or not the estimated positions Xu(t) are falsified.

2. The positioning system as claimed in claim 1, wherein the digital filter integrates a set of estimated positions Xu[t] over all or part of a journey.

3. The positioning system as claimed in claim 1, wherein the frequency of falsifications for a given user u is calculated and stored in a database.

4. The positioning system as claimed in claim 1, wherein the frequency of falsifications for chosen geographical zones is determined and stored in a database.

5. The positioning system as claimed in claim 1, wherein the estimated positions are used for the implementation of road tolls.

6. The positioning system as claimed in claim 5, wherein the consolidation module performs a correlation between the estimated positions considered as suspicious and a pricing database comprising the geographical coordinates of the pricing zones.

7. A positioning system comprising:

at least one onboard GNSS satellite receiver in a mobile element belonging to a user u, said receiver having a function of estimating a position Xu of said mobile element at various instants,

a first processing module determining a consistency indicator coh(X) by combining the estimated positions Xu[t] and data provided by secondary information sources, a dynamic model of movement of the mobile elements to be positioned being used, said indicator being determined by comparing a speed, acceleration, gyration [v, a, g] triplet derived from direction and velocity measurements taken by the mobile element, to a dynamic model of movement of an object, vehicle, person or animal to be positioned,

a consolidation module configured to store the positions Xu[t] estimated at various instants t by user u,

a digital filter configured to obtain a filtered position Xf[t] from the stored positions Xu[t] of the user, the consistency indicator coh(X) being calculated from the filtered positions Xf[t], and

a detection device configured to determine from the consistency indicator coh(X) whether or not the estimated positions Xu(t) are falsified.

8. The positioning system as claimed in claim 7, wherein the digital filter integrates a set of estimated positions Xu[t] over all or part of a journey.

9. The positioning system as claimed in claim 7, wherein the frequency of falsifications for a given user u is calculated and stored in a database.

10. The positioning system as claimed in claim 7, wherein the frequency of falsifications for chosen geographical zones is determined and stored in a database.

11. The positioning system as claimed in claim 7, wherein the estimated positions are used for the implementation of road tolls.

12. The positioning system as claimed in claim 11, wherein the consolidation module performs a correlation between the estimated positions considered as suspicious and a pricing database comprising the geographical coordinates of the pricing zones.