Direction-finding system

Details Direction-finding system Direction-finding system

G - Physics

01

S

343/105

G01S 3/10 (2006.01) G01S 3/14 (2006.01) H01Q 25/02 (2006.01)

Patent

CA 1213341

A B S T R A C T For the direction-finding of electromagnetic waves on ships, the ship's masts, above all, appear as a source of inter- ference downgrading the bearing measurement. To suppress the interference a direction-finding system with a plurality of antennas and a plurality of different directional patterns are used, wherein at least two of the directional patterns have a null position in the fore and aft direction of the ship which favour- ably extends completely through the vertical plane that passes through the ship's fore and aft axis, Particularly advantageous is the use of a twin loop consisting of two loop antennas, their loop planes being vertical and parallel to the ship's fore and aft axis. A dipole voltage and a loop voltage are respectively coupled out of these loop antennas and are connected to the corresponding voltage of the other loop. The arrangement is advantageously ex- tended to a crossed DF antenna by a second twin loop arranged perpendicularly to the first. The direction-finding system can be operated in conjunction with a conventional two-channel display unit.

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