Integration of aime augmentation into GNSS products

• US 5,969,668 A
• Filed: 07/29/1997
• Issued: 10/19/1999
• Est. Priority Date: 07/29/1997
• Status: Expired due to Term

• Current Assignee: Rockwell Collins, Inc. (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: Rockwell International Corporation
• Inventors: Young, James A. Jr.
• Primary Examiner(s): Tarcza, Thomas
• Assistant Examiner(s): Drummond, Devin
• Application Number:
  US08/979,915
• Time in Patent Office: 812 Days
• Field of Search: 342/357, 701/200, 340/961
• US Class Current: 701/215
• CPC Class Codes: G01S 19/15 Aircraft landing systems
• CPC Class Codes: G01S 19/20 Integrity monitoring, fault detection or fault isolation of space segment
• CPC Class Codes: G01S 19/49 whereby the further system is an inertial position system, e.g. loosely-coupled

Abstract

A global navigation satellite system (GNSS) receiver for use in an aircraft is disclosed. The GNSS receiver includes receiver circuitry for receiving satellite signals containing satellite data from a multiple GNSS satellites. The receiver circuitry generates a first navigation solution for the aircraft as function of the satellite data. A first GNSS receiver output couples to an inertial reference system (IRS) and provides the satellite data to the IRS. The IRS generates a second navigation solution for the aircraft as a function of the satellite data and as a function of IRS position data. A first GNSS receiver input couples to the IRS and receives the second navigation solution from the IRS. The GNSS receiver provides at a second output aircraft position information as a function of the second navigation solution.

Claims

1. A global navigation satellite system (GNSS) receiver for use in an aircraft, the GNSS receiver comprising:

receiver circuitry for receiving satellite signals from a plurality of satellites, wherein the satellite signals contain satellite data, the receiver circuitry generating a first navigation solution for the aircraft as function of the satellite data;

a first receiver output for coupling to an inertial reference system (IRS) and providing the satellite data to the IRS, wherein the IRS to which the first receiver output couples generates a second navigation solution as a function of the satellite data and as a function of IRS position data;

a first receiver input for coupling to the IRS and receiving the second navigation solution from the IRS; and

a second receiver output for coupling to GNSS inputs of other systems in the aircraft, wherein the GNSS receiver provides at the second receiver output aircraft position information as a function of the second navigation solution.

2. The GNSS receiver of claim 1, wherein the position information provided at the second GNSS receiver output is indicative of the second navigation solution.

3. The GNSS receiver of claim 1, wherein each of the first and second navigation solutions are indicative of the position of the aircraft.

4. The GNSS receiver of claim 3, wherein the GNSS receiver provides at the second receiver output the position information also as a function of the first navigation solution.

5. The GNSS receiver of claim 4, wherein each of the first and second navigation solutions include integrity limit data having a value associated therewith, wherein the integrity limit data of each of the first and second navigation solutions is indicative of a quality of the respective ones of the first and second navigation solutions, wherein the position information provided at the second output is indicative of the first navigation solution if the value associated with the integrity limit data of the first navigation solution is less than the value associated with the integrity limit data of the second navigation solution, and wherein the position information provided at the second output is indicative of the second navigation solution if the value associated with the integrity limit data of the second navigation solution is less than the value associated with the integrity limit data of the first navigation solution.

6. The GNSS receiver of claim 5, wherein the satellites are global positioning system (GPS) satellites and the GNSS receiver is a GPS receiver.

7. The GNSS receiver of claim 6, wherein the receiver circuitry generates the first navigation solution using the RAIM algorithm.

8. The GNSS receiver of claim 6, wherein the second navigation solution is a navigation solution generated using the AIME algorithm.

9. A global positioning system (GPS) receiver for use in an aircraft, the GPS receiver comprising:

receiver circuitry for receiving satellite signals from a plurality of satellites, wherein the satellite signals contain satellite data;

a first receiver output for coupling to an inertial reference system (IRS) and providing the satellite data to the IRS, wherein the IRS to which the first receiver output couples generates a first navigation solution as a function of the satellite data and as a function of IRS position data;

a first receiver input for coupling to the IRS and receiving the first navigation solution from the IRS; and

a second receiver output for coupling to GPS inputs of other systems in the aircraft, wherein the GPS receiver provides at the second receiver output aircraft position information as a function of the first navigation solution.

10. The GPS receiver of claim 9, wherein the first navigation solution is a navigation solution generated using the AIME algorithm.

11. The GPS receiver of claim 10, wherein the receiver circuitry further generates a second navigation solution for the aircraft as function of the satellite data, wherein each of the first and second navigation solutions are indicative of the position of the aircraft, wherein the GPS receiver provides at the second GPS receiver output the position information also as a function of the second navigation solution.

12. The GPS receiver of claim 11, and further comprising a switching device having a first switching device input coupled to the GPS receiver circuitry and receiving the second navigation solution and having a second switching device input coupled to the first receiver input and receiving the first navigation solution from the IRS, the switching device having an output coupled to the second receiver output, wherein the switching device is controlled to selectively provide at the second receiver output aircraft position information indicative of one of the first and second navigation solutions.

13. The GNSS receiver of claim 12, wherein each of the first and second navigation solutions include integrity limit data having a value associated therewith, wherein the integrity limit data of each of the first and second navigation solutions is indicative of a quality of the respective ones of the first and second navigation solutions, wherein the switching device is controlled such that position information provided at the second output is indicative of the first navigation solution if the value associated with the integrity limit data of the first navigation solution is less than the value associated with the integrity limit data of the second navigation solution, and such that the position information provided at the second output is indicative of the second navigation solution if the value associated with the integrity limit data of the second navigation solution is less than the value associated with the integrity limit data of the first navigation solution.

14. The GPS receiver of claim 13, wherein the receiver circuitry generates the second navigation solution using the RAIM algorithm.

15. A global positioning system (GPS) receiver for use in an aircraft, the GPS receiver comprising:

receiver circuitry for receiving satellite signals from a plurality of satellites, wherein the satellite signals contain satellite data;

a first receiver output for coupling to a first externally positioned navigation solution generating device and providing the satellite data to the first externally positioned navigation solution generating device, wherein the first navigation solution generating device generates a first navigation solution for the aircraft as a function of the satellite data;

a first receiver input for coupling to the first externally positioned navigation solution generating device and receiving the first navigation solution from the first navigation solution generating device; and

a second receiver output for coupling to GPS inputs of other systems in the aircraft, wherein the GPS receiver provides at the second receiver output aircraft position information as a function of the first navigation solution generated by the first navigation solution generating device.

16. The GPS receiver of claim 15, wherein the first navigation solution is generated using the AIME algorithm.

17. The GPS receiver of claim 16, wherein the first navigation solution generating device is an inertial reference system (IRS) which implements the AIME algorithm and wherein the first receiver output and the first receiver input are adapted for coupling to the IRS.

18. The GPS receiver of claim 17, wherein the receiver circuitry further generates a second navigation solution for the aircraft as function of the satellite data, wherein each of the first and second navigation solutions are indicative of the position of the aircraft, wherein the GPS receiver provides at the second GPS receiver output the position information also as a function of the second navigation solution.

19. The GPS receiver of claim 18, and further comprising a switching device having a first switching device input coupled to the GPS receiver circuitry and receiving the second navigation solution and having a second switching device input coupled to the first receiver input and receiving the first navigation solution from the IRS, the switching device having an output coupled to the second receiver output, wherein the switching device is controlled to selectively provide at the second receiver output aircraft position information indicative of one of the first and second navigation solutions.

20. The GNSS receiver of claim 19, wherein each of the first and second navigation solutions include integrity limit data having a value associated therewith, wherein the integrity limit data of each of the first and second navigation solutions is indicative of a quality of the respective ones of the first and second navigation solutions, wherein the switching device is controlled such that position information provided at the second output is indicative of the first navigation solution if the value associated with the integrity limit data of the first navigation solution is less than the value associated with the integrity limit data of the second navigation solution, and such that the position information provided at the second output is indicative of the second navigation solution if the value associated with the integrity limit data of the second navigation solution is less than the value associated with the integrity limit data of the first navigation solution.