Radio direction-finding
CA 1265602 C · Owner: Cusdin, Anthony Richard · Inventors: Cusdin, Anthony Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A radio direction-finding system comprises at least two adjacent, coplanar rectilinear antenna arrays (ARR1 ARR2) which, face in different directions; phase measurements are performed on pairs of antennae of different spacings (ANTC/ANT1-ANTN) in each array in order to derive the direction of incidence in the plane of the arrays and/or the direction of incidence with respect to said plane, e.g. bearing (?) and elevation (.beta.) respectively. To reduce the number of channels required for resolving ambiguity in the phase measurement on the widest-spaced antenna pair (ANTC/ANTN) in each array, ambiguity is resolved as far as possible with more closely spaced pairs in each array and finally …
Read the whole patent
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 February 6, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 6, 2007.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.