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Mapping systems

  • US 4,276,618 A
  • Filed: 05/11/1979
  • Issued: 06/30/1981
  • Est. Priority Date: 05/25/1978
  • Status: Expired due to Term
First Claim
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1. A method of operating an apparatus, for surveying a region, the apparatus including transmitter means capable of transmitting energy along a plurality of paths lying radially in a sector of a circle and receiver means capable of being focussed on positions in said region to receive energy reflected therein, the method being suitable to provide echo data, for individual ones of a plurality of positions in said region, suitable for display on a raster of scanned lines in a display apparatus, and including the steps of defining a plurality of said positions disposed on a cartesian matrix notionally defined in said region such that lines of said positions correspond to said scanned lines of said display arrangement;

  • directing the transmitted energy into the region along a plurality of said radial paths such that each path is of sufficient width to intercept a plurality of said positions;

    focussing the receiver means in sequence on each of the plurality of positions intercepted by one of said paths to receive energy reflected therein; and

    repeating the preceding step for the other said paths.

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