Apparatus and method for rail track inspection

• US 6,570,497 B2
• Filed: 08/30/2001
• Issued: 05/27/2003
• Est. Priority Date: 08/30/2001
• Status: Expired due to Term

• Current Assignee: GE Global Sourcing LLC (Westinghouse Air Brake Technologies Corporation)
• Original Assignee: General Electric Company
• Inventors: Hershey, John Erik, Tomlinson, Harold Woodruff Jr., Hladik, Stephen Michael, Puckette, Charles McDonald IV
• Primary Examiner(s): POPE, DARYL C
• Application Number:
  US09/941,916
• Publication Number:
  US 20030048193A1
• Time in Patent Office: 635 Days
• Field of Search: 340/901, 340/902, 340/903, 340/904, 340/905, 340/933, 340/539, 340/942, 340/941, 340/943, 340/436, 340/437, 701/301, 701/19, 701/28, 701/117, 731/46
• US Class Current: 340/539.1
• CPC Class Codes: B61K 9/08 Measuring installations for surveying permanent way applications of measuring apparatus or devices for track building purposes E01B35/00; measuring techniques G01
• CPC Class Codes: B61L 15/0094 Recorders on the vehicle
• CPC Class Codes: B61L 2205/04 Satellite based navigation systems, e.g. global positioning system [GPS]
• CPC Class Codes: B61L 23/044 Broken rails
• CPC Class Codes: B61L 23/047 Track or rail movements
• CPC Class Codes: G01S 13/0209 Systems with very large relative bandwidth, i.e. larger than 10 %, e.g. baseband, pulse, carrier-free, ultrawideband
• CPC Class Codes: G01S 13/60 wherein the transmitter and receiver are mounted on the moving object, e.g. for determining ground speed, drift angle, ground track G01S13/64 takes precedence
• 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 13/9027 Pattern recognition for feature extraction
• CPC Class Codes: G01S 13/9029 specially adapted for moving target detection within a single SAR image or within multiple SAR images taken at the same time
• CPC Class Codes: G01S 13/9043 Forward-looking SAR
• CPC Class Codes: G01S 7/003 Transmission of data between radar, sonar or lidar systems and remote stations
• CPC Class Codes: G01S 7/41 using analysis of echo signal for target characterisation; Target signature; Target cross-section

Abstract

An apparatus for inspecting an operational condition of a rail track from a railcar includes an antenna positioned on the railcar that directs radar signals toward the rail track and collects radar signals returned from the rail track. A radar transceiver is connected to the antenna and supplying the radar signals to the antenna. The radar transceiver receives radar returned signals from an interaction of the radar signal with the rail track. A controller is connected to the radar transceiver for controlling transmission of the radar signals from the radar transceiver and receipt of the radar returned signals. A signal processing unit is connected to the controller and a sensor unit that supplies input data to the signal processing unit. The signal processing unit processes at least the input data and the radar returned signal to produce processor output data and to determine the operational condition of the rail track.

Claims

1. An apparatus for inspecting a rail track from a railcar traveling on the rail track, the apparatus comprising:

an antenna positioned on the railcar and directing radar signals toward the rail track and collecting radar signals returned from the rail track;

a radar transceiver connected to the antenna for supplying the radar signals to the antenna, the radar signals being directed toward the rail track and electromagnetically interacting with the rail track, the radar transceiver receiving radar returned signals based on the electromagnetic interaction of the radar signals with the rail track;

a controller connected to the radar transceiver for controlling transmission of the radar signals from the radar transceiver and receipt of the radar returned signals;

a signal processing unit connected to the controller; and

a sensor unit connected to the signal processing unit for supplying input data to the signal processing unit wherein the signal processing unit processes at least the input data and the radar returned signal to produce processor output data;

a database connected to the signal processing unit for storing the processor output data and for archiving previously processed processor output data, wherein the signal processing unit compares the processor output data with the previously processed processor output data to determine an existence of an imperfection in the rail track.

2. The apparatus of claim 1 wherein the sensor unit comprises at least one of the group consisting of a track speed sensor and clock, a track speed sensor and position reporter, and a position reporter and a clock.

3. The apparatus of claim 1 wherein the radar signals comprises one of the group consisting of a continuous wave (CW) signal, pulse train signal, wideband pulse signal, and synthetic aperture radar (SAR) signal.

4. The apparatus of claim 1 further comprising a display connected to the signal processing unit for displaying the existence of the imperfection in the rail track.

5. The apparatus of claim 1 further comprising an annunciator connected to the signal processing unit for indicating the existence of the imperfection in the rail track.

6. The apparatus of claim 1 further comprising a radio transceiver connected to the signal processing unit for transmitting the processor output data and for receiving previously processed processor output data.

7. An apparatus for inspecting a rail track from a railcar traveling on the rail track, the apparatus comprising:

an antenna positioned on the railcar and directing radar signals toward the rail track and collecting radar signals returned from the rail track;

a radar transceiver connected to the antenna for supplying the radar signals to the antenna, the radar signals being directed toward the rail track and electromagnetically interacting with the rail track, the radar transceiver receiving radar returned signals based on the electromagnetic interaction of the radar signals with the rail track;

a controller connected to the radar transceiver for controlling transmission of the radar signals from the radar transceiver and receipt of the radar returned signals;

a signal processing unit connected to the controller; and

a sensor unit connected to the signal processing unit for supplying input data to the signal processing unit wherein the signal processing unit processes at least the input data and the radar returned signal to produce processor output data and to determine an existence of an imperfection in the rail track.

8. The apparatus of claim 7 wherein the sensor unit comprises at least one of the group consisting of a track speed sensor and clock, a track speed sensor and position reporter, and a position reporter and a clock.

9. The apparatus of claim 7 wherein the radar signals comprises one of the group consisting of a continuous wave (CW) signal, pulse train signal, wideband pulse signal, and synthetic aperture radar (SAR) signal.

10. The apparatus of claim 7 further comprising a database connected to the signal processing unit for storing the processor output data and for archiving previously processed processor output data.

11. The apparatus of claim 7 further comprising a display connected to the signal processing unit for displaying the existence of the imperfection in the rail track.

12. The apparatus of claim 7 further comprising an annunciator connected to the signal processing unit for indicating the existence of the imperfection in the rail track.

13. The apparatus of claim 7 further comprising a radio transceiver connected to the signal processing unit for transmitting the processor output data and for receiving previously processed processor output data.

14. The apparatus of claim 7 wherein the antenna comprises a first antenna connected to the radar transceiver for directing radar signals toward the rail track and a second antenna connected to the radar transceiver for receiving the radar returned signals.

15. A method for inspecting a rail track from a railcar traveling on the rail track, the method comprising the steps of:

emitting a radar signal from the railcar toward the rail track, the emitted radar signal electromagnetically interacting with the rail track;

receiving a radar returned signal based on the electromagnetic interaction of the emitted radar signal with the rail track;

processing the radar returned signal to produce processor output data; and

determining an existence of an imperfection in the rail track based on the step of processing the radar returned signal.

16. The method of claim 15 wherein the step of processing further comprises the step of measuring at least one of the group consisting of track speed and time, track speed and position, and position and time.

17. The method of claim 15 further comprising the step of storing the processor output data in a database.

18. The method of claim 15 wherein the step of processing comprises:

analyzing the radar return signal;

producing the processor output data from the step of analyzing;

storing the processor output data in a database;

archiving previously processed processor output data in the database; and

comparing the processor output data with the previously processed processor output data.

19. The method of claim 15 further comprising the step of displaying the existence of the imperfection in the rail track.

20. The method of claim 15 further comprising the step of annunciating the existence of the imperfection in the rail track.

21. A method for inspecting a rail track from a railcar traveling on the rail track, the method comprising the steps of:

emitting a radar signal from a railcar toward the rail track, the emitted radar signal electromagnetically interacting with the rail track;

receiving a radar returned signal based upon the electromagnetic interaction of the emitted radar signal with the rail track;

processing the radar return signal;

producing the processor output data from the step of processing;

comparing the processor output data with previously processed processor output data; and

determining an existence of an imperfection in the rail track based on the step of comparing.

22. The method of claim 21 wherein the step of processing further comprises the step of measuring at least one of the group consisting of track speed and time, track speed and position and the time.

23. The method of claim 21 further comprising the step of displaying the existence of the imperfection in of the rail track.

24. The method of claim 21 further comprising the step of annunciating the existence of the imperfection in the rail track.

25. The method of claim 21 further comprising the steps of:

storing the processor output data in a database; and

archiving the previously processed processor output data in the database.