Slope monitoring system

• US 20040046690A1
• Filed: 06/04/2003
• Published: 03/11/2004
• Est. Priority Date: 12/04/2000
• Status: Active Grant

• Current Assignee: GroundProbe Pty Ltd. (Orica Limited)
• Original Assignee: GroundProbe Pty Ltd. (Orica Limited)
• Inventors: Stickley, Glen, Longstaff, Dennis, Noon, David, Reeves, Brian
• Granted Patent: US 6,850,183 B2
• Time in Patent Office: Days
• US Class Current: 342/175
• CPC Class Codes: G01C 11/00 Photogrammetry or videogrammetry, e.g. stereogrammetry; Photographic surveying
• CPC Class Codes: G01S 13/867 Combination of radar systems with cameras
• CPC Class Codes: G01S 13/88 Radar or analogous systems specially adapted for specific applications electromagnetic prospecting or detecting of objects, e.g. near-field detection, G01V3/00
• CPC Class Codes: G01S 13/89 for mapping or imaging
• CPC Class Codes: G01S 7/4082 using externally generated reference signals, e.g. via remote reflector or transponder

Abstract

A slope monitoring system having a radar and a video camera recording images sequences of the slope. A data processing unit performs coordinate registration to align the radar images and the video images. Interferometry is used to detect movement in the slope by generating interference maps between the images. These are suitably phase maps showing the phase change between a radar image and a reference image. An alarm occurs if a significant movement is detected.

Claims

1. A slope monitoring system comprising:

a radar module that records radar images of a selected slope;

a video module that records visual images of said selected slope;

and data processing means that performs;

coordinate registration to align said radar images and said video images; and

interferometry to produce interference maps indicative of movement of said selected slope from said radar images and/or said video images.

2. The slope monitoring system of claim 1 wherein the data processing means is a discrete data processing module.

3. The slope monitoring system of claim 1 wherein the data processing means is a distributed module with functions performed in one or more of the radar module, the video module, or further modules.

4. The slope monitoring system of claim 1 wherein the interference maps are produced between successive radar images.

5. The slope monitoring system of claim 1 wherein the interference maps are produced between an initial radar image and a later radar image.

6. The slope monitoring system of claim 1 wherein each radar image is a phase map and the interference map depicts phase change over time.

7. The slope monitoring system of claim 6 wherein each interference map indicates displacement that has occurred between an initial phase map and a later phase map.

8. The slope monitoring system of claim 1 wherein the interference maps are produced in the radar module.

9. The slope monitoring system of claim 1 wherein the data processing means performs additional processing including data processing algorithms for improving the quality of the radar images and video images.

10. The slope monitoring system of claim 9 wherein the additional processing includes algorithms for performing one or more of:

sky detection;

vegetation detection;

spurious signal rejection;

image overlay;

atmospheric correction; and

interferometric filtering.

11. The slope monitoring system of claim 1 further comprising display means associated with the data processing means.

12. The slope monitoring system of claim 1 further comprising a failure prediction module programmed with algorithms that analyse the radar images and video images to output diagnostic and predictive indicators.

13. The slope monitoring system of claim 12 wherein the failure prediction module generates alarms indicative of predicted slope failure.

14. The slope monitoring system of claim 12 further comprising an input device for a user to set thresholds for use by the failure prediction module.

15. The slope monitoring system of claim 12 wherein the algorithms programmed in the failure prediction module utilize models and data stored in an associated knowledge base device.

16. The slope monitoring system of claim 1 further comprising a failure prediction module utilizing models and data stored in an associated knowledge base device and having as input data from one or more of:

extensometers;

laser electronic distance measurements;

photogrammetry;

water pressure measurements;

and historical video images.

17. The slope monitoring system of claim 12 wherein the failure prediction module is programmed with pixel stability algorithms.

18. The slope monitoring system of claim 12 wherein the failure prediction module determines critical movements in the selected slope by analyzing pixel by pixel stability data determined by pixel stability algorithms.

19. The slope monitoring system of claim 1 further comprising communication means providing remote communication between said radar module, said video module and said data processing means.

20. A method of identifying a region of a slope prone to failure including the steps of:

recording a video image of the slope;

recording a first radar image of the slope;

recording a second radar image of the slope;

calculating an interference map from the first radar image and the second radar image;

performing coordinate registration between the interference map and the video image;

analysing the interference map to identify regions prone to failure;

and using the coordinate registration to identify the region on the slope.

21. The method of claim 20 further including the steps of generating an alarm to indicate impending failure of the slope.

22. The method of claim 21 wherein the step of generating an alarm includes the steps of:

determining critical movements of the slope;

comparing the critical movements to a knowledge base of critical movements; and

generating an alarm if the critical movement is indicative of failure according to the knowledge base.