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Angle of Arrival Measurements of 3.2-Centimeter Radio Waves


Enenstein, Norman Harry (1949) Angle of Arrival Measurements of 3.2-Centimeter Radio Waves. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/sm1m-5x15.


A study was made of the atmospheric and terrestrial phenomena that influence the angle of arrival of microwaves at a receiving station. The primary atmospheric phenomenon studied was the refractive bending due to vertical gradients of the index of refraction. Terrestrial effects of multi-path radio ray transmission were considered.

A theoretical study of the contribution of free water in the atmosphere in the form of water droplets to the atmospheric index of refraction was made. It was found that water droplets do not add appreciably to the refractive index. Also a method of theoretically determining directly the angle of arrival due to refractive bending was derived.

Angle of arrival measurements were made at the California Institute of Technology, Pasadena, California, over a 7.15- mile path from Mt. Wilson, California, to Cal Tech. Measurements were made using 3.2-centimeter radio equipment with a metal lens antenna. Variations in angle of 0.31 degree were measured. These variations were greater than to be expected by refractive bending. Multi-path propagation is believed to have caused these comparatively large variations.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Electrical Engineering and Physics)
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Electrical Engineering
Minor Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Pickering, William Hayward
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1949
Record Number:CaltechTHESIS:02162024-224029425
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16295
Deposited By: Benjamin Perez
Deposited On:21 Feb 2024 17:17
Last Modified:21 Feb 2024 17:17

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