System and method for providing GNSS corrections

Patent metadata

Field	Value
Publication number	US-11693120-B2
Application number	US-202217884254-A
Country	US
Kind code	B2
Filing date	Aug 9, 2022
Priority date	Aug 9, 2021
Publication date	Jul 4, 2023
Grant date	Jul 4, 2023

Abstract

A method for disseminating corrections can include receiving a set of satellite observations at a GNSS receiver; transmitting the corrections to the GNSS receiver, wherein the corrections; and determining a position of the GNSS receiver, wherein the set of satellite observations are corrected using the corrections. A system for disseminating corrections can include a positioning engine operating on a computing system collocated with a GNSS antenna; and a corrections generator operating on a computing system remote from the GNSS antenna, wherein the corrections generator is configured to transmit corrections to the positioning engine, wherein the positioning engine is configured to determine a high accuracy position of the GNSS antenna using the corrections, wherein the corrections are rebroadcast to the positioning engine with a time period less than an update time period for changing the corrections.

First claim

We claim:

1. A system for disseminating GNSS corrections information comprising:
a GNSS receiver coupled to a GNSS antenna wherein the GNSS antenna receives observations from a plurality of in-view satellites;
a positioning engine operating on a computing system collocated with the GNSS antenna; and
a corrections generator operating on a computing system remote from the GNSS antenna,
wherein the corrections generator is configured to transmit antenna phase center corrections to the positioning engine,
wherein the positioning engine is configured to determine a set of corrected satellite observations based on the antenna phase center corrections and determine a high accuracy position of the GNSS antenna based on the set of corrected satellite observations,
wherein the antenna phase center corrections are rebroadcast to the positioning engine with a time period less than an update time period for changing the antenna phase center corrections.

2. The system of claim 1 , wherein the antenna phase center corrections comprise an antenna phase center correction for each satellite in-view of the GNSS antenna.

3. The system of claim 2 , wherein the antenna phase center corrections comprise a satellite generation for each of the satellites in-view of the GNSS antenna, wherein the positioning engine is configured to determine a yaw model for determining an orientation of a satellite in-view of the GNSS receiver based on the satellite generation associated with the respective satellite.

4. The system of claim 2 , wherein the antenna phase center comprises a phase center offset for each of the satellites in-view of the GNSS antenna.

5. The system of claim 4 , wherein each phase center offset is stored with a precision of 1 mm, wherein a range of potential values for each phase center offset is between −5 m and 5 m.

6. The system of claim 4 , wherein the antenna phase center further comprises a plurality of phase center variations for each of the satellites in-view of the GNSS antenna.

7. The system of claim 6 , wherein each phase center variation of the plurality of phase center variations is associated with a different elevation angle.

8. The system of claim 7 , wherein the different elevation angles differ by 10, wherein the different elevation angles are between 00 and 18°.

9. The system of claim 6 , wherein each of the phase center variations comprises a precision of 1 mm.

10. The system of claim 6 , wherein a number of phase center variations is the same for satellites in-view of the GNSS antenna associated with different satellite constellations.

11. A method for disseminating antenna phase center (APC) corrections comprising:
receiving a set of satellite observations at a GNSS receiver via a GNSS antenna from a plurality of in-view satellites;
transmitting, from a cloud computing system to a positioning engine collocated with the GNSS receiver, the APC corrections associated with the plurality of in-view satellites to the GNSS receiver,
wherein the APC corrections comprise, for each satellite of the plurality of in-view satellites:
a phase center offset (PCO) in an x, a y, and a z coordinate;
a phase center variation (PCV) for a plurality of elevation angles; and

at the positioning engine, determining a set of corrected satellite observations based on the APC corrections and determining a position of the GNSS receiver based on the set of corrected satellite observations;
wherein the APC corrections are retransmitted after a retransmission time, wherein the retransmission time is at least 20 minutes.

12. The method of claim 11 , wherein the APC corrections further comprise, for each satellite of the plurality of in-view satellites:
a signal code comprising a satellite constellation and a frequency associated with the PCO and the PCV for the respective satellite;
a satellite identifier; and
a satellite generation.

13. The method of claim 12 , wherein the positioning engine determines a satellite geometry for a satellite based on the satellite generation.

14. The method of claim 11 , wherein the PCV for each satellite of the plurality of in-view satellites is independent of azimuthal angle.

15. The method of claim 11 , wherein each PCO comprises a precision of 1 mm, wherein a range of potential values for each PCO is between −5 meters (m) and 5 m.

16. The method of claim 15 , wherein each PCV comprises a precision of 1 mm, wherein a range of potential values for each PCV is between −0.1 m and 0.1 m.

Assignees

• Swift Navigation Inc

Inventors

• Angelo Joseph
• Bade Leith
• Carcanague Sébastien

Classifications

• G01S19/072 Primary

  Ionosphere corrections · CPC title

• G01S19/04 Primary

  providing carrier phase data · CPC title

• G01S19/252

  Employing an initial estimate of location in generating assistance data · CPC title