INERTIA/GNSS NAVIGATION SYSTEM

• US 20110122023A1
• Filed: 11/19/2010
• Published: 05/26/2011
• Est. Priority Date: 11/20/2009
• Status: Abandoned Application

• Current Assignee: Sagem Defense Securite SA (Safran SA)
• Original Assignee: Sagem Defense Securite SA (Safran SA)
• Inventors: GOUDON, Jean-Claude, Gavillet, Simon
• Application Number:
  US12/950,469
• Publication Number:
  US 20110122023A1
• Time in Patent Office: Days
• US Class Current: 342/357.65
• CPC Class Codes: G01C 23/00 Combined instruments indicating more than one navigational value, e.g. for aircraft; Combined measuring devices for measuring two or more variables of movement, e.g. distance, speed or acceleration
• CPC Class Codes: G01S 19/26 involving a sensor measurement for aiding acquisition or tracking
• CPC Class Codes: G01S 19/28 Satellite selection
• CPC Class Codes: G01S 19/36 relating to the receiver frond end
• CPC Class Codes: G01S 19/49 whereby the further system is an inertial position system, e.g. loosely-coupled

Abstract

The invention relates to an inertia GNSS navigation System linked to a vehicle comprising:

a set of acquisition units of sensor data each delivering sensor data in digital form,

a unit for processing sensor data (30) configured to exploit digital data delivered by said set of acquisition units and to plot a status vector of the dynamics of the vehicle,

and in which the set of acquisition units of sensor data comprises:

a unit for acquiring and digitising GNSS signals (20) comprising an antenna structure (RA) configured to receive GNSS signals and an analog-digital converter (2) coupled to the antenna structure and configured to deliver GNSS signals in digital form to the unit for processing sensor data

an inertial measuring unit (6) configured to deliver inertial data originating from inertial sensors in digital form to the unit for processing sensor data.

Claims

1. An inertia/GNSS navigation system linked to a vehicle, comprising:

a set of acquisition unite of sensor data each delivering sensor data in digital form,

a unit for processing sensor data (30) configured to exploit digital data delivered by said set of acquisition units and to calculate a status vector of the dynamics of the vehicle, and in which the set of acquisition units of sensor data comprises;

a unit for acquiring and digitising GNSS signals (20) comprising an antenna structure (RA) configured to receive GNSS signals and an analog-digital converter (2) coupled to the antenna structure and configured to deliver GNSS signals in digital form to the unit for processing sensor data

an inertial measuring unit (6) configured to deliver inertial data originating from inertial sensors in digital form to the unit for processing sensor data.

2. The system as claimed in claim 1, in which the set of acquisition units of sensor data also comprises a unit for acquiring and digitising data originating from aerodynamic sensors of data (40), the unit for processing sensor data also exploiting said aerodynamic data to calculate the status vector of the dynamics of the vehicle.

3. The system as claimed in any one of claims 1 to 2, in which the inertial measuring unit is integrated within the unit for processing sensor data.

4. The system as claimed in any one of claims 1 to 2, in which the inertial measuring unit is offset from the unit for processing sensor data.

5. The system as claimed in any one of claims 1 to 4, in which the unit for processing sensor data is also configured to execute adaptive spatio-temporal or spatio-frequential processing of GNSS signals delivered by the acquisition and digitising module of GNSS signals.

6. The system as claimed in any one of claims 1 to 5, in which the antenna structure is formed by a network of antennae with controllable radiation pattern, and in which the unit, for processing sensor data is also configured to execute recombination of GNSS signals originating from each of the antennae of the network.

7. The system as claimed in claim 6, in which the unit for processing sensor data also uses inertial data delivered by the inertial measuring unit to determine the direction of satellites observable in the marker of the antenna structure and the gain of the antenna structure is modified in the determined directions.

8. The system as claimed in any one of claim 6 or 7, in which the unit for processing sensor data corrects GNSS signals delivered by the acquisition and digitising unit of GNSS signals on the basis of incoherence of differences in phase and pseudo-distance between each antenna of the network.

9. The system as claimed in any one of claims 1 to 8, in which the unit for processing sensor data is also configured to execute at least hybridisation processing of data delivered by the various units of the set of acquisition units of sensor data to plot the status vector of the dynamics of the vehicle.

10. The system as claimed in any one of claims 1 to 9, comprising a plurality of units for processing sensor data, and in which the acquisition and digitising unit of GNSS signals transmits GNSS signals in digital form to several units of the plurality of units for processing sensor data.

11. The system as claimed in any one of claims 1 to 10, comprising a plurality of units for processing sensor data, and in which the inertial measuring unit transmits inertial data in digital form to several units of the plurality of units for processing sensor data.