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Method and Apparatus for Reading Two Dimensional Identification Symbols Using Radar TechniquesA method and apparatus are provided for sensing two-dimensional identification marks provided on a substrate or embedded within a substrate below a surface of the substrate. Micropower impulse radar is used to transmit a high risetime, short duration pulse to a focussed radar target area of the substrate having the two dimensional identification marks. The method further includes the steps of listening for radar echoes returned from the identification marks during a short listening period window occurring a predetermined time after transmission of the radar pulse. If radar echoes are detected, an image processing step is carried out. If no radar echoes are detected, the method further includes sequentially transmitting further high risetime, short duration pulses, and listening for radar echoes from each of said further pulses after different elapsed times for each of the further pulses until radar echoes are detected. When radar echoes are detected, data based on the detected echoes is processed to produce an image of the identification marks.
Document ID
20030053342
Acquisition Source
Marshall Space Flight Center
Document Type
Other - Patent
External Source(s)
MFS-31230-1
Authors
Harry F Schramm Jr.
(Marshall Space Flight Center Redstone Arsenal, United States)
Donald L Roxby
(Marshall Space Flight Center Redstone Arsenal, United States)
Date Acquired
August 21, 2013
Publication Date
March 4, 2003
Subject Category
Communications And Radar
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-Patent-6,529,154
Patent Application
US-Patent-Appl-SN-528795
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