Cancellation of group delay error by dual speed of rotation
CA 1159934 A · Owner: Bayly Engineering Limited · Inventors: Krajewski, Zdzistaw A.A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Radio direction finders using the principle of periodic scanning of a circular array inherently display a bearing error related to the group delay through the receiving detection and evaluation process. Correcting by subtracting a constant .THETA.0 is simple but it is difficult to keep .THETA.0 constant. The present invention cancels the group delay error instead of compensating for it with a predetermined constant. Scanning is done at angular velocities .omega.1 and .omega.2 for m turns and n turns respectively. The parameters are related by the formulae ... (1), n - m = 1 ... (2), Group delay errors are cancelled by computing the true bearing from the formula, n.THETA.2 - m.THETA.1 = …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted January 3, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 3, 2001.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.