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Antenna pattern for point reflectors on the spherical earth

✍ Scribed by Daniel Levine

Publisher
Elsevier Science
Year
1962
Tongue
English
Weight
396 KB
Volume
273
Category
Article
ISSN
0016-0032

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✦ Synopsis

For an airborne radar system to have constant return from point reflectors o~ the ground, the antenna pattern must be designed to follow the surface curvature. The gain function required for this purpose can differ markedly from the cosecantsqnared variation, which is suitable for a plane earth. The earth-curvature correction is significant if the maximum radar range exceeds RM/4, where RM is the distance to the radio horizon. Consequently, for a specific maximum range the pattern modification becomes of increasing importance with decrease of altitude, approaching a limiting value of 6 db. The maximum gain of the corrected pattern is derived from the results of a previous paper on this subject. 2

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