The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 31, 1976
Filed:
May. 28, 1974
Sueichi Tsuruta, Fujisawa, JA;
Hiroharu Nishiguchi, Tokyo, JA;
Takamura Takigawa, Hino, JA;
Shiro Hikawa, Mitaka, JA;
Kazunori Kitasumi, Chigasaki, JA;
Mitsui Shipbuilding and Engineering Co., Ltd., BOTH OF, JA;
Kyoritsu Dempa Co., Ltd., BOTH OF, JA;
Abstract
In a PPI display type radar system wherein a sector shaped unit scanning surface is established in a scanning plane and a unit scanning surface is shifted progressively in the radial and circumferential directions to seach the received pattern for judging a target. The received pattern is identified by dividing the unit scanning surface into a plurality of annular sections derived from a plurality of concentric circles. The scanning unit for scanning surfaces having approximately the same area over the entire scanning surface is designed in such a manner that the ratio (percentage of extraction) of a number of sampled scanning beams to the number of actual scanning beams is a maximum when scanning an annular section which is located most remotely from the center. The percentage of extraction is gradually decreased toward the center so that the percentage of extraction becomes a minimum 1/n (where n is an integer) when scanning an annular section closest to the center. Scanning the received signal in each unit scanning surface with a scanning beam at equal numbers in the radial and circumferential directions and at substantially the equal spacing obtains a pattern of the received signal in accordance with the presence or absence thereof, and the target may be judged in accordance with the size of the pattern.