System, method, and apparatus for compensating for ionospheric delay in a multi constellation single radio frequency path GNSS receiver

• US 9,784,846 B2
• Filed: 03/17/2014
• Issued: 10/10/2017
• Est. Priority Date: 08/21/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Sagiraju, Phanikrishna, Nolte, William
• Primary Examiner(s): Nguyen, Chuong P
• Application Number:
  US14/215,835
• Publication Number:
  US 20150054686A1
• Time in Patent Office: 1,303 Days
• Field of Search: 34235744, 34235773, 34235734
• CPC Class Codes: G01S 19/072 Ionosphere corrections
• CPC Class Codes: G01S 19/39 the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
• CPC Class Codes: G01S 19/40 Correcting position, velocity or attitude
• CPC Class Codes: G01S 19/51 Relative positioning

Abstract

Systems, methods, and apparatuses are provided for compensating for ionospheric delay in multi constellation Global Navigation Satellite Systems (GNSSs). In one method, a single Radio Frequency (RF) path receiver receives a first signal at a first frequency from a first satellite in a first GNSS constellation, receives a second signal at a second frequency from a second satellite in a second GNSS constellation, and calculates the ionospheric delay using the received first signal and the received second signal.

Claims

1. A method for a single Radio Frequency (RF) path receiver to compensate for ionospheric delay in multi constellation Global Navigation Satellite Systems (GNSSs), the method comprising:

identifying that a first satellite in a first GNSS constellation and a second satellite in a second GNSS constellation are within a predetermined distance from each other;

receiving a first signal at a first frequency from the first satellite;

receiving a second signal at a second frequency from the second satellite; and

calculating the ionospheric delay using the received first signal and the received second signal,

wherein identifying that the first satellite and the second satellite are within the predetermined distance from each other comprises identifying that the first satellite and the second satellite are positioned within a same sector among a plurality of sectors in an azimuth plane.

2. The method of claim 1, wherein the ionospheric delay is calculated using:

3. The method of claim 1, wherein identifying that the first satellite and the second satellite are within the predetermined distance from each other further comprises:

determining a first azimuth and elevation of the first satellite;

determining a second azimuth and elevation of the second satellite; and

comparing the determined first azimuth and elevation to the determined second azimuth and elevation.

4. The method of claim 1, wherein the plurality of sectors are formed by dividing at least a portion of the azimuth plane into a plurality of azimuth divisions.

5. The method of claim 1, wherein the plurality of sectors are formed by dividing at least a portion of the azimuth plane into a plurality of elevations.

6. The method of claim 1, wherein the plurality of sectors are formed by dividing at least a portion of the azimuth plane into a plurality of azimuth divisions and one or more elevations,

where each sector of the plurality of sectors is formed by the boundaries of an azimuth division and the one or more elevations.

7. A single Radio Frequency (RF) path receiver that compensates for ionospheric delay in multi constellation Global Navigation Satellite Systems (GNSSs), the receiver comprising:

an antenna configured to receive a first signal at a first frequency from a first satellite in a first GNSS constellation, and to receive a second signal at a second frequency from a second satellite in a second GNSS constellation;

a processor; and

a non-transitory computer-readable medium having program instructions recorded thereon, the program instructions configured for the processor to

identify that the first satellite and the second satellite are within a predetermined distance from each other; and

calculate the ionospheric delay using the received first signal and the received second signal,

wherein the processor identifies that the first satellite and the second satellite are within the predetermined distance from each other by identifying that the first satellite and the second satellite are positioned within a same sector among a plurality of sectors in an azimuth plane.

8. The receiver of claim 7, wherein the processor calculates the ionospheric delay using:

9. The receiver of claim 7, wherein the processor further identifies that the first satellite and the second satellite are within the predetermined distance from each other by determining a first azimuth and elevation of the first satellite, determining a second azimuth and elevation of the second satellite, and comparing the determined first azimuth and elevation to the determined second azimuth and elevation.

10. The receiver of claim 7, wherein the plurality of sectors are formed by dividing at least a portion of the azimuth plane into a plurality of azimuth divisions.

11. The method of claim 7, wherein the plurality of sectors are formed by dividing at least a portion of the azimuth plane into a plurality of elevations.

12. The method of claim 7, wherein the plurality of sectors are formed by dividing at least a portion of the azimuth plane into a plurality of azimuth divisions and one or more elevations, and

wherein each sector of the plurality of sectors is formed by boundaries of an azimuth division and the one or more elevations.

13. A navigation system, comprising:

a first satellite in a first Global Navigation Satellite Systems (GNSS) constellation;

a second satellite in a second GNSS constellation; and

a single Radio Frequency (RF) path receiver configured to receive a first signal at a first frequency from the first satellite, receive a second signal at a second frequency from the second satellite, and calculate ionospheric delay using the received first signal and the received second signal,

wherein the receiver identifies that the first satellite and the second satellite are within a predetermined distance from each other, when the first satellite and the second satellite are positioned within a same sector among a plurality of sectors in an azimuth plane.

14. The system of claim 13, wherein the receiver calculates the ionospheric delay using: