Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1999-07-12
2000-12-19
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342154, 342174, 342372, G01S 502, G01S 1300
Patent
active
061632961
ABSTRACT:
A near-field calibration arrangement for an antenna array determines the phase shifts or attenuation of the elemental control elements of the array. The calibration system includes a probe located in the near field, and a calibration tone generator. The tone generator is coupled to the probe in the case of calibration of a receive antenna, and to the signal port of the array in the case of calibration of a transmit antenna. A code generator generates sets of values, with each set being orthogonal to the others. The codes are applied to the control input port of the array antenna, so that the codes encode the tone passing through the antenna. The encoded tones are applied to a decoder and processor, which processes the signals to determine the phase shift or attenuation associated with each bit of the control signal. A transmit antenna attitude determination or pointing arrangement uses the calibration tone generator in conjunction with a plurality of remote sites.
REFERENCES:
patent: 3818478 (1974-06-01), Groginsky
patent: 4292637 (1981-09-01), Johnson
patent: 4306236 (1981-12-01), Johnson
patent: 5790071 (1998-08-01), Silverstein et al.
Kautz Gregory Michael
Lier Erik
Purdy Daniel Sanford
Lockheed Martin Corp.
Meise W. H.
Phan Dao L.
Tarcza Thomas H.
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