METHOD OF RESOLVING MULTIPLE SWEEP AMBIGUITIES ENCOUNTERED IN HIGH RESOLUTION GRAPHIC RECORDERS AND THE LIKE

A high resolution recording system is one in which the signal transit time significantly exceeds the recorder sweep so that N sweeps occur before the first recorded return. Thus, it becomes a problem to determine which sweep from time zero is represented by a recorded mark. This problem is referred...

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Bibliographic Details
Main Author BOEGEMAN D,US
Format Patent
LanguageEnglish
Published 17.04.1973
Subjects
ANALOGOUS ARRANGEMENTS USING OTHER WAVES
DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES
LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES
MEASURING
PHYSICS
RADIO DIRECTION-FINDING
RADIO NAVIGATION
TESTING
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Summary:A high resolution recording system is one in which the signal transit time significantly exceeds the recorder sweep so that N sweeps occur before the first recorded return. Thus, it becomes a problem to determine which sweep from time zero is represented by a recorded mark. This problem is referred to as the multiple sweep ambiguity. To resolve the ambiguity, the recorder sweep speed (stylus velocity) can be varied a small amount, such as 5 percent, and a series of marks made at this increased sweep speed. These marks will be offset a distance equal to N/20 of a sweep where N is the unknown number of elapsed sweeps. A measurement of the offset distance provides a permanent index representative of the total elapsed time.
Bibliography:Application Number: USD3728734