Communications: directive radio wave systems and devices (e.g. – Determining distance – Height finder
Patent
1988-10-11
1996-09-17
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Determining distance
Height finder
342140, G01S 1308
Patent
active
055572820
ABSTRACT:
A ground based radar antenna system and method for determining the elevation angle .phi. of a tracked target having a shaped reflector and a pair of spaced feedhorns for transmitting radiated energy to and receiving returned signals from the tracked target T, the shaped reflector and feedhorns cooperating to increase the range of coverage of the elevation angle .phi. beyond the coverage previously available with a standard parabolic reflector and to increase the gain of the signals returned to the ground based radar antenna system while simultaneously eliminating elevation angle ambiguities over prior systems employing only feedhorns for collecting returned signals. The radar system includes a construction which approximates a cosecant-squared antenna pattern, permits the calculation of the target height and three-dimensional position, and is economical to manufacture.
REFERENCES:
patent: 3106708 (1963-10-01), Sletten
patent: 3277470 (1966-10-01), Page
Hellner Mark
Hogan Patrick M.
ITT Corporation
Twomey Thomas N.
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