System and mehtod for providing space-based precision position correlations for promoting improved availability, accuracy and integrity

• US 9,726,764 B1
• Filed: 12/07/2009
• Issued: 08/08/2017
• Est. Priority Date: 12/07/2009
• Status: Active Grant

• Current Assignee: Rockwell Collins, Inc. (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: Rockwell Collins, Inc. (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Heinrich, Richard E.
• Primary Examiner(s): Gregory, Bernarr
• Assistant Examiner(s): Mull, Fred H
• Application Number:
  US12/632,448
• Time in Patent Office: 2,801 Days
• Field of Search: 34235729, 34235731, 34235773, 34235758
• CPC Class Codes: G01S 19/40 Correcting position, velocity or attitude
• CPC Class Codes: G01S 19/423 by combining or switching between position solutions derived from different satellite radio beacon positioning systems

Abstract

The present invention is directed to system for providing precision location determination. The system includes a receiver configured for receiving both a first set of signals from a first constellation of satellites and a second set of signals from a second constellation of satellites. The system further includes a processor, which is connected to the receiver and is configured for processing the received satellite signals. The system further includes control programming for executing on the processor. The control programming is configured for determining a first location of the receiver based upon the first set of received signals and for determining a second location of the receiver based upon the second set of received signals. The control programming is further configured for correlating the first location and the second location to provide an enhanced location for the receiver.

Claims

1. A system for providing a receiver module position, comprising:

a receiver module and antenna configured to receive one or more satellite signals from each of two or more satellite constellations; and

a processor connected to the receiver module and a non-transitory computer-readable storage medium, the processor being configured to access the non-transitory computer-readable storage medium to perform the following steps;

determine a solution set comprising at least a first location and a second location based on the one or more satellite signals received from each of the two or more satellite constellations;

evaluate the locations of the solution set and assign a score to each location of the solution set;

correlate the locations of the solution set including the first location and the second location with each other to remove a location from the solution set based on the assigned scores;

track an orientation of the receiver module with respect to a satellite associated with the location removed from the solution set; and

determine a receiver module position based on one or more locations remaining in the solution set.

2. The system of claim 1, wherein the processor is further configured to compute an error associated with a location of the solution set.

3. The system of claim 2, wherein the error is removed from the receiver module via differential correction.

4. The system of claim 1, wherein the two or more satellite constellations include at least two of:

Global Positioning System satellites, Galileo satellites, Compass satellites, Global Navigation Satellite System satellites and Multifunctional Transport satellites.

5. The system of claim 1, wherein the one or more satellite signals received from each of two or more satellite constellations comprises at least six satellite signals, and wherein a first signal received from a first satellite has a first signal-in-space protocol and a second signal received from a second satellite has a second signal-in-space protocol, said second signal-in-space protocol being a different signal-in-space protocol than the first signal-in-space protocol.

6. The system of claim 1, wherein a first constellation type of the two or more satellite constellations includes Global Positioning System satellites and a second constellation type includes Galileo satellites.

7. The system of claim 1, wherein the score of each location of the solution set is weighted based on satellite geometry.

8. The system of claim 7, wherein the satellite geometry comprises a low look angle or a high look angle, and wherein the processor is further configured to correlate the plurality of locations of the solution set and determine the receiver module position based on relative weighting or prioritization of the scoring of the locations of the solution set.

9. The system of claim 1, wherein the scoring of each location of the solution set is based on satellite geometry, and wherein the position of the receiver module is a three-dimensional position comprising latitude, longitude, and altitude.

10. A method for providing a position of a receiver module, the method comprising:

receiving, by a receiver module and antenna, one or more satellite signals from each of two or more satellite constellations;

determining, by a processor, a solution set comprising at least a first location and a second location based on the one or more satellite signals received from each of the two or more satellite constellations;

evaluating, by the processor, locations of the solution set including assigning a score to the first location and the second location;

correlating, by the processor, the first location and the second location with each other to remove a location from the solution set based on the assigned score;

tracking an orientation of the receiver module with respect to a satellite associated with the location removed from the solution set; and

determining a receiver module position based on one or more locations remaining in the solution set.

11. The method of claim 10, wherein evaluating the locations of the solution set further comprises assigning a score to a satellite associated with one of the first location and the second location, wherein the location is removed based on the score assigned to the first location or the score assigned to the second location and the score assigned to the satellite, and wherein the score assigned to the satellite is assigned based on a signal quality associated with the satellite.

12. The method of claim 10, further comprising:

assigning a score to a satellite based on a signal quality of the satellite, wherein the satellite is a first satellite and the score assigned to the first satellite indicates that the signal quality of the first satellite is poorer than a signal quality of a second satellite.

13. The method of claim 10, wherein the solution set comprises a first solution set, the method further comprising:

automatically excluding a satellite signal of the satellite associated with the location removed from determining a second solution set of at least a third location and a fourth location until the orientation of the receiver module changes with respect to the satellite or a quality of the satellite signal is above a predetermine threshold.

14. The method of claim 13, wherein the satellite signal is automatically excluded until the orientation of the receiver module changes and the quality of the satellite signal is above the predetermined threshold.

15. A computer program product comprising:

a non-transitory memory with electronic instructions configured to be accessed by a processor to cause the processor to perform the following steps;

receive one or more satellite signals from each of two or more satellite constellations;

determine a solution set comprising a plurality of locations of a receiver module based on the one or more satellite signals from each of the two or more satellite constellations;

evaluate the plurality of locations of the solution set, wherein evaluating the plurality of locations comprises assigning a score to each location of the solution set, the score based in part on a signal quality or a geometry of a satellite associated with each location of the solution set;

correlate the locations in the solution set to remove a location from the solution set based on the assigned scores;

track an orientation of the receiver module with respect to a satellite associated with the location removed from the solution set; and

determine a receiver module position based on one or more locations remaining in the solution set.

16. The computer program product of claim 15, wherein the processor is further configured to:

associate an error with a location remaining in the solution set, the location remaining in the solution set comprising two or more locations, wherein the receiver module position is determined based on a least erroneous location of the two or more locations remaining in the solution set.