Communications: directive radio wave systems and devices (e.g. – Radar transponder system – Navigational
Patent
1991-08-01
1993-11-30
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
Navigational
364569, 307518, G01S 1308
Patent
active
052669530
ABSTRACT:
An apparatus to be employed within a precision distance measuring system for estimating pulse time-of-arrival. The apparatus facilitates the use of an Adaptive Fixed Threshold method for such estimation. The invention compensates for pulse time detection errors induced by variations in incident pulse amplitude and shape by adjusting the estimated time-of-arrival. This adjustment is performed as a function of the measured pulse slope between two low-amplitude threshold levels through the use of a predetermined reference table of error adjustment times.
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Biggs Michael G.
Drutch Gary A.
Ireland Howard H.
Kelly Robert J.
Winter Janice A.
Allied-Signal Inc.
Hellner Mark
Massung Howard G.
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