NDLI: A technique to refine the elevation estimates in low-angle tracking data measured with an array antenna

Content Provider	IEEE Xplore Digital Library
Author	Hung, E.K.L. Morris, J.E.
Copyright Year	1990
Description	Author affiliation: Defence Res. Establ. Ottawa, Ont., Canada (Hung, E.K.L.)
Abstract	A technique to refine target elevation estimates by modifying the antenna calibration table is described. The data were measured with an array antenna and low-level aircraft flying over water. An optical tracker mounted close to the antenna provided an independent measure of the target elevation. In data measurement, there was an unknown error source which produced a date-dependent offset in the antenna boresight direction. A previous analysis of the data, using the singular value decomposition method, found that there were false tracks branching out from the target and image tracks. The modified calibration table significantly reduces both the number of these false tracks and the scattering of the estimates close to the output target tracks. It also reveals that the gradient of the output target track was less negative than that of the optical track. A possible link between this property and the data-dependence of the offset in antenna boresight direction is discussed.
Starting Page	434
Ending Page	438
File Size	327674
Page Count	5
File Format	PDF
DOI	10.1109/RADAR.1990.201204
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1990-05-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Target tracking Antenna measurements Optical scattering Calibration Directive antennas Antenna arrays Aircraft Data analysis Image analysis Singular value decomposition
Content Type	Text
Resource Type	Article

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