spiral scanning


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spiral scanning

[′spī·rəl ′skan·iŋ]
(engineering)
Scanning in which the direction of maximum radiation describes a portion of a spiral; the rotation is always in one direction; used with some types of radar antennas.

helical scan

helical scanclick for a larger image
In radar scanning, varying the azimuth and elevation of the antenna continuously to generate a spiral pattern of the beam. This scan pattern is used in fire-control and GCI (ground-controlled interception) radars. Also called spiral scanning.
References in periodicals archive ?
In the spherical spiral scanning, the AUT is located at the origin of a spherical coordinate system (r, [?
This section is devoted to show some experimental results assessing the effectiveness of the described NF-FF transformation with spherical spiral scanning for quasi-planar antennas.
An experimental validation of the NF-FF transformation technique with spherical spiral scanning suitable for quasi-planar antennas and using a two-bowls modelling of the AUT has been provided in this paper.
Savarese, "Probe compensated far-field reconstruction by near-field planar spiral scanning," IEE Proc.
Migliozzi, "An effective NF-FF transformation technique with planar spiral scanning tailored for quasi-planar antennas," IEEE Trans.
Savarese, "NF-FF transformation with spherical spiral scanning," IEEE Antennas Wireless Propagat.
Riccio, "A nonredundant near-field to far-field transformation with spherical spiral scanning for nonspherical antennas," The Open Electrical & Electronic Eng.
Migliozzi, "Experimental assessment of an effective near-field-far-field transformation with spherical spiral scanning for quasi-planar antennas," IEEE Antennas Wireless Propagat.
Savarese, "Theoretical foundations of near-field-far-field transformations with spiral scannings," Progress In Electromagnetics Research, Vol.
Savarese, "Directivity computation by spherical spiral scanning in NF region," Journal Electromagnetic Waves and Applications, Vol.
The unified theory of spiral scannings for nonspherical antennas [10], obtained by paralleling the rigorous procedure [6] valid when adopting the spherical AUT modeling, allows one to develop the voltage representation on the sphere from a nonredundant number of its samples collected along the spiral.
The scanning spiral, the parameter [xi] for describing it, and the corresponding phase factor [gamma] are then determined according to the unified theory of spiral scannings.