Electronic identification system

• US 5,132,687 A
• Filed: 01/30/1990
• Issued: 07/21/1992
• Est. Priority Date: 02/13/1980
• Status: Expired due to Term

• Current Assignee: Canadian National
• Original Assignee: Canadian National
• Inventors: Baldwin, Howard A., Walker, Conrad M. B., Brockelsby, William K.
• Primary Examiner(s): Sotomayor, John B.
• Application Number:
  US07/472,535
• Time in Patent Office: 903 Days
• Field of Search: 342/50, 342/51, 342/42, 342/44
• US Class Current: 342/44
• CPC Class Codes: B61L 25/048 using programmable tags
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: G07C 9/28 the pass enabling tracking or indicating presence
• CPC Class Codes: G08G 1/017 identifying vehicles G08G1/015, G08G1/054 take precedence

Abstract

An identification system to identify objects from a remote interrogation station may be used with moving objects such as railroad cars. The system remotely programs and stores information on an object and remotely retrieves information from the object. An information and identity storage device is located on the object and at least one interrogation station is located remotely from the object.

Claims

1. A low power electronic identification system for remotely programming and storing information on an object and remotely retrieving information from the object, including, in combination, an information and identity storage device located on the object, and at least one interrogation station, one of said object and station moving and the other of said object and station being fixed, said station being located relatively remotely from the object, for reading and programming the information and identity storage device without physical contact when said one moves adjacent said other;

the information and identity storage device comprising;

memory means for storing information and identity data for later retrieval,

protect means for protecting a portion of the memory means against accidental erasure,

logic circuit means for producing a predetermined coded signal representing the information and identity data stored in the memory means,

transmitter means for transmitting the coded signal,

trigger circuit means which is triggered in response to receiving a burst of energy of a predetermined wavelength for, when triggered, causing the coded signal to be transmitted by the transmitter means and,

means providing a power source for the information and identity storage device,

the interrogation station comprising;

interrogation signal means for triggering the trigger circuit means in the information and identity storage device, by providing a said burst of energy,

receiver means for receiving the coded signal from the information and identity storage device,

synchronization means between the information and identity storage device and the receiver means for synchronizing the signals transmitted therebetween and,

decoder means for decoding the coded signal for verifying the accuracy of the coded signal, and for recovering the information and identity data stored in the memory means of the information and identity storage device.

2. The system as set forth in claim 1 wherein said information and identity storage device further comprises:

a first antenna, connected in the trigger circuit means, for picking up a said burst of energy;

a second antenna for transmitting the coded signal from the transmitter means; and

an absolute time source integral with the information and identity storage device.

3. The system according to claim 2 wherein the first antenna and second antenna in the information and identity storage device and the antenna in the interrogation station comprise patch antennas.

4. The system according to claim 2 wherein the said power source maintains a constant output to operate the absolute time source and to maintain the trigger circuit means in a ready condition to receive an interrogation signal prior to activation of the trigger circuit means.

5. The system according to claim 2 wherein the coded signal is read at least three times.

6. The system according to claim 1 wherein the memory means constitutes means for storing a plurality of pages representing the information and identity.

7. The system according to claim 6 wherein the logic circuit includes means for providing selection from the plurality of pages upon receipt of predetermined timed interrogation pulses from the interrogation station.

8. The system according to claim 1 wherein the decoder means includes means for verifying the accuracy of the coded signal by including an integral count of a number of zeros in the coded signal.

9. The system according to claim 1 further comprising means located adjacent said other of said object and station for indicating the arrival of said one adjacent said other.

10. The system according to claim 1 wherein said means providing a power source is selected from the group consisting of a long life battery, an inertial generator, an electromagnetic radiation power source, an induction power source, a visible light power source, and an infrared light power source.