Method and apparatus for determining earth station parameters su

Details Method and apparatus for determining earth station parameters su Method and apparatus for determining earth station parameters su

1988-04-19

1989-12-19

Hille, Rolf

Communications: radio wave antennas

Antennas

Measuring signal energy

343786, 343909, 342174, 455 12, H01Q 1700, H01Q 1300

Patent

active

048885967

ABSTRACT:
Methods and apparatus for determining operating parameters, such as rain margin, of an antenna by attenuating the received signal by, for example, the use of calibrated attenuation pads, the method comprising placing such pads in front of the horn of the antenna feed until impulses appear on the screen of a T.V. or monitor connected to the antenna. The antenna alignment is peaked by determining the orientation of the antenna that yields the minimum impulses. The rain or impulse noise margin is determined by summing the attenuation factors of the pads with the increase in delta G/T due to the attenuation. The tuning of the receiver can be checked by observing the number of black and white impulses. The positioning of the antenna with respect to the polarization of the signal can be checked by determining the rotational position of the feedhorn which yields the minimum number of impulses. The descrambler dropout margin and clear sky carrier-to-noise ratio are determined by the addition of proper constants. The antenna can be a Ku-band antenna. A set of pads related, for example, by powers of two, for use in determining operational parameters of an antenna is also disclosed. By use of these methods and apparatus, the antenna system's conformance with specification requirements can be determined.

REFERENCES:
patent: 4301533 (1981-11-01), Acampora et al.
patent: 4309764 (1982-01-01), Acampora
patent: 4495506 (1985-01-01), Sasser et al.
patent: 4761055 (1988-08-01), Hatje
patent: 4776035 (1988-10-01), Duggan

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