Apparatus for maintaining the orientation of an antenna...

Details Apparatus for maintaining the orientation of an antenna... Apparatus for maintaining the orientation of an antenna...

Category

G - Physics

Subcategory

01

Subsubcategory

S

CPC

351/19

IPC codes

G01S 3/32 (2006.01) H01Q 3/08 (2006.01)

Type

Patent

Patent number

CA 1235798

Description

Abstract In an apparatus for maintaining the orientation of an antenna system with respect to a beacon, radio signals are received in four quadrants and converted into sum and difference signals, which are transformed in frequency, amplified in an amplifier (6) and detected in a first- and second-phase detector (9, 15) present in a corresponding channel (7, 8) to derive error voltages in first and second time intervals respectively for aligning the antenna system with respect to the beacon. During the tracking mode of the apparatus, the difference and sum signals separately pass in first, second and third, fourth time intervals respectively. A VCO (21) supplies two orthogonal signals as reference voltage to the phase detectors. In the tracking mode the VCO is driven by a signal derived from the signals obtained in the first channel (7) in the fourth time interval and in the second channel (8) in the third time interval. With a gain control circuit (27) the gain of the amplifier (6) is adjusted, in response to signals obtained in the first and the second channels (7, 8) in the said third and fourth time intervals respectively, in such a way that the output voltage of the first phase detector (9) in the third and first time interval and that of the second phase detector (15) in the fourth and second time interval are kept constant.

Application Number

488963

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