Communications: directive radio wave systems and devices (e.g. – Directive – Utilizing correlation techniques
Patent
1995-12-14
1997-09-09
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Utilizing correlation techniques
342380, 342372, 342442, G01S 316, G01S 328
Patent
active
056661240
ABSTRACT:
A high gain Cassegrain reflector antenna system is disclosed for use in a RF signal receiving application. In one embodiment of the invention the antenna is a single parabolic reflector antenna having a plurality of feeds, while in another embodiment the RF signal is received by a number of parabolic reflector antennas. Each received RF signal component is separately amplified to produce corresponding individual amplified signals which are then summed to produce a summation signal. A phase difference between the summation signal and each individual amplified signal is determined, and each individual amplified signal is then phase adjusted until it is in a substantially coherent phase relationship with the summation signal. The phase adjustment compensates for phase displacement errors occurring due to, by example, an effective sector displacement error of a primary reflector of the Cassegrain antenna assembly. The phase adjustment may also compensate for phase displacement errors which result from an angular displacement of the received signal, such as that caused by atmospheric scintillation.
REFERENCES:
patent: 3623094 (1971-11-01), Grabowski et al.
patent: 4268829 (1981-05-01), Baurle et al.
patent: 4532518 (1985-07-01), Gaglione et al.
patent: 4628321 (1986-12-01), Martin
Chethik Frank
Costello Bryan S.
Blum Theodore M.
Loral Aerospace Corp.
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