IP Library › Granted Patent US 12,298,409
Granted Patent B2
US 12,298,409 · App. 17/948,182 · Granted May 13, 2025

GNSS forecast and background obscuration prediction

Inventors: Jeremy Charles Bennington (Greenwood, IN); Richard West (Paignton, GB); Paul Hansen (Cambridge, GB); Esther Anyaegbu (Northampton, GB); Matthew Pottle (Paignton, GB)
Assignee: Spirent Communications PLC
G01S19/08H04L67/12G08G1/0968
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Quick Facts
Patent No.
US 12,298,409
App. No.
17/948,182
Granted
May 13, 2025
Kind
B2
Abstract

Disclosed is representing distant objects for analysis of satellite line-of-sight visibility from a grid of points by constructing a first 3D model of foreground objects that obscure line-of-sight visibility of satellites from a grid of points, wherein the first 3D model is at a first resolution, where spacing of grid points denotes obstruction edges, constructing a second 3D model of background objects that are more than a threshold distance away and that object obscure line-of-sight visibility of satellites from the grid of points, wherein the second 3D model is at a second resolution that is different from and coarser than the first resolution, calculating a line-of-sight visibility of the satellites from the grid of points using a combination of the first and second 3D models, and responding to a query for an area by providing the calculated line-of-sight visibility of the satellites for points of the grid within the area.

Claims (32)

1. A method of representing distant objects for analysis of satellite line-of-sight visibility from a grid of points, the method comprising:

constructing a first 3D model of foreground objects that obscure line-of-sight visibility of satellites from the grid of points, wherein the first 3D model is at a first resolution, wherein at least some first model points denote obstruction edges of the foreground objects;

constructing a second 3D model of background objects that are more than a threshold distance away, further away than the foreground objects, and that obscure line-of-sight visibility of satellites from the grid of points, wherein the second 3D model is at a second resolution of second model points that is different from and coarser than the first resolution;

calculating a line-of-sight visibility of the satellites from the grid of points using both the foreground and background objects in the first and second 3D models; and

responding to a query for an area by providing line-of-sight visibility of the satellites for points of the grid within the area, as calculated.

2. The method of claim 1 , wherein at least some obstruction edges of the first 3D model represent building edges.

3. The method of claim 1 , wherein at least some obstruction edges of the second 3D model represent terrain features.

4. The method of claim 1 , wherein the first resolution is in a range of 2 centimeters (cm) to 5 meters (m).

5. The method of claim 1 , wherein the first resolution is in a range of 5 cm to 1 m.

6. The method of claim 1 , wherein the threshold distance is in a threshold distance range of 400 m to 5 kilometers (km).

7. The method of claim 1 , wherein the second resolution is in a range of 10 m through 50 m.

8. A non-transitory computer readable storage medium impressed with computer program instructions to represent distant objects for analysis of satellite line-of-sight visibility from a grid of points, the instructions, when executed on a processor, implement a method comprising:

constructing a first 3D model of foreground objects that obscure line-of-sight visibility of satellites from the grid of points, wherein the first 3D model is at a first resolution, wherein at least some first model points denote obstruction edges of the foreground objects;

constructing a second 3D model of background objects that are more than a threshold distance away, further away than the foreground objects, and that obscure line-of-sight visibility of satellites from the grid of points, wherein the second 3D model is at a second resolution of second model points that is different from and coarser than the first resolution;

calculating a line-of-sight visibility of the satellites from the grid of points using both the foreground and background objects in the first and second 3D models; and

responding to a query for an area by providing line-of-sight visibility of the satellites for points of the grid within the area, as calculated.

9. The non-transitory computer readable storage medium of claim 8 , wherein at least some obstruction edges of the first 3D model represent building edges.

10. The non-transitory computer readable storage medium of claim 8 , wherein at least some obstruction edges of the second 3D model represent terrain features.

11. The non-transitory computer readable storage medium of claim 8 , wherein the first resolution is in a range of 2 centimeters (cm) to 5 meters (m).

12. The non-transitory computer readable storage medium of claim 8 , wherein the first resolution is in a range of 5 cm to 1 m.

13. The non-transitory computer readable storage medium of claim 8 , wherein the threshold distance is in a threshold distance range of 400 m to 5 kilometers (km).

14. The non-transitory computer readable storage medium of claim 8 , wherein the second resolution is in a range of 10 m through 50 m.

15. A system including one or more processors coupled to memory, the memory loaded with computer instructions to represent distant objects for analysis of satellite line-of-sight visibility from a grid of points, the instructions, when executed on the processors, implement actions comprising:

constructing a first 3D model of foreground objects that obscure line-of-sight visibility of satellites from the grid of points, wherein the first 3D model is at a first resolution, wherein at least some first model points denote obstruction edges of the foreground objects;

constructing a second 3D model of background objects that are more than a threshold distance away, further away than the foreground objects, and that obscure line-of-sight visibility of satellites from the grid of points, wherein the second 3D model is at a second resolution of second model points that is different from and coarser than the first resolution;

calculating a line-of-sight visibility of the satellites from the grid of points using both the foreground and background objects in the first and second 3D models; and

responding to a query for an area by providing line-of-sight visibility of the satellites for points of the grid within the area, as calculated.

16. The system of claim 15 , wherein at least some obstruction edges of the first 3D model represent building edges.

17. The system of claim 15 , wherein at least some obstruction edges of the second 3D model represent terrain features.

18. The system of claim 15 , wherein the first resolution is in a range of 2 centimeters (cm) to 5 meters (m).

19. The system of claim 15 , wherein the threshold distance is in a threshold distance range of 400 m to 5 kilometers (km).

20. The system of claim 15 , wherein the second resolution is in a range of 10 m through 50 m.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 17, 2022
From: BENNINGTON, JEREMY CHARLES; WEST, RICHARD; HANSEN, PAUL; ANYAEGBU, ESTHER; POTTLE, MATTHEW
To: SPIRENT COMMUNICATIONS, PLC
Reel/Frame 061436/0198 →
Continuity (6)
Continuation In Part 17706421 · Mar 28, 2022
Continuation 17374885 · Jul 13, 2021
Provisional Application 63407589 · Sep 16, 2022
Provisional Application 63051849 · Jul 14, 2020
Provisional Application 63161386 · Mar 15, 2021
Related Publication 20230121760A1 · Apr 20, 2023
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US 12,429,599