Communications: directive radio wave systems and devices (e.g. – Determining distance – Material level within container
Patent
1988-01-20
1989-07-11
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Determining distance
Material level within container
342172, 342192, G01S 1308
Patent
active
048476234
ABSTRACT:
A sweep frequency, continuous wave (CW) radar tank gauge (3) providing measurement of the level of tank contents or ullage (19), having greatly improved accuracy through improved methods of processing calibrate and return signals directed toward the surface of tank contents (20). Use of sweep synchronous measurement (46) of time domain calibrate/return difference signals (42) and time domain of a virtual "carrier" fundamental in the frequency domain, provide highly accurate measure of tank signal return times. The entire range of return signals is made available for processing and analysis (5), including distinguishable tank bottom reflections.
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Stuchly et al, "Microwave Surface Level Monitor"; IEEE Trans. on Industrial Electronics and Control Instrumentation; (vol. IECI-18, No. 3; 8/71; pp. 85-92).
Young, "An Automated Multiple-Frequency Radar System"; 1974 Intl. IEEE/AP-S Symposium Digest `Antennas and Propagation`, (6/74; pp. 347-349).
Edvardsson, "An FMCW Radar for Accurate Level Measurements"; Proceedings of the Nineth European MW Conf.; (9/79; pp. 712-716).
Blanchard Andrew J.
Clark Billy V.
Jean Buford R.
Newton Richard W.
Warren Gary L.
Blum Theodore M.
Gregory Bernarr Earl
Idea, Inc.
Lidd Francis J.
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