US 12,487,310 B2
Direction finder antenna system
Moshe Fireaizen, Kfar Saba (IL); and Aharon Razon, Tel-Aviv (IL)
Assigned to Elta Systems Ltd., Ashdod (IL)
Appl. No. 18/553,302
Filed by Elta Systems Ltd., Ashdod (IL)
PCT Filed Mar. 27, 2022, PCT No. PCT/IL2022/050335
§ 371(c)(1), (2) Date Sep. 29, 2023,
PCT Pub. No. WO2022/215064, PCT Pub. Date Oct. 13, 2022.
Claims priority of application No. 282125 (IL), filed on Apr. 6, 2021; and application No. 287016 (IL), filed on Oct. 5, 2021.
Prior Publication US 2024/0201305 A1, Jun. 20, 2024
Int. Cl. G01S 5/04 (2006.01); G01S 3/46 (2006.01); G01S 3/48 (2006.01); G01S 5/06 (2006.01); G01S 3/72 (2006.01)
CPC G01S 3/46 (2013.01) [G01S 3/48 (2013.01); G01S 5/04 (2013.01); G01S 5/06 (2013.01); G01S 3/465 (2013.01); G01S 3/72 (2013.01)] 31 Claims
OG exemplary drawing
 
1. A direction finder antenna system, comprising:
a rotatable platform comprising at least two antenna units positioned on the rotatable platform at selected distance therebetween;
a motor configured for moving the rotatable platform at a motion pattern;
a control circuit comprising a signal collection circuit configured for receiving data on signal portions collected by said at least two antenna units with respect to different angular positions of said at least two antenna units and generate output data indicative of direction of origin of collected signal;
wherein said control circuit is configured for determining data indicative of phase difference between signal portions collected by said first and second antenna units for different angular positions of said rotatable platform between absolute maximal and minimal phase difference, and for determining magnitude of said relation between phase difference between signal portions collected by said first and second antenna units and angular orientation of said rotatable platform, and provide output data indicative of direction of origins of the collected signal comprising azimuth within plane of rotation of said rotatable platform and elevation with respect to said plane determined in accordance with a zero phase difference position, wherein the selected distance between the at least two antenna units is smaller than a half wavelength of the collected signal.