NDLI: Phased array radiometer calibration using a radiated noise source

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Phased array radiometer calibration using a radiated noise source

Content Provider	NASA Technical Reports Server (NTRS)
Author	Srinivasan, Karthik Limaye, Ashutoch S. Laymon, Charles A. Meyer, Paul J.
Copyright Year	2010
Description	Electronic beam steering capability of phased array antenna systems offer significant advantages when used in real aperture imaging radiometers. The sensitivity of such systems is limited by the ability to accurately calibrate variations in the antenna circuit characteristics. Passive antenna systems, which require mechanical rotation to scan the beam, have stable characteristics and the noise figure of the antenna can be characterized with knowledge of its physical temperature [1],[2]. Phased array antenna systems provide the ability to electronically steer the beam in any desired direction. Such antennas make use of active components (amplifiers, phase shifters) to provide electronic scanning capability while maintaining a low antenna noise figure. The gain fluctuations in the active components can be significant, resulting in substantial calibration difficulties [3]. In this paper, we introduce two novel calibration techniques that provide an end-to-end calibration of a real-aperture, phased array radiometer system. Empirical data will be shown to illustrate the performance of both methods.
File Size	1607134
Page Count	24
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20100032967
Archival Resource Key	ark:/13960/t9n34tz7k
Language	English
Publisher Date	2010-07-25
Access Restriction	Open
Subject Keyword	Communications And Radar Radiometers Steerable Antennas Calibrating Circuits Imaging Techniques Noise Generators Rotation Phased Arrays Beam Steering Antenna Design Apertures Low Noise Antenna Arrays Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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