Calibration method and arrangement

Details Calibration method and arrangement Calibration method and arrangement

1999-06-18

2001-07-03

Gregory, Bernarr E. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Testing or calibrating of radar system

By monitoring

C342S165000, C342S173000, C342S195000, C342S196000, C342S368000

Reexamination Certificate

active

06255986

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a calibration device and a method for calibrating a transmitter and/or a receiver to activate a beam forming network.
BACKGROUND INFORMATION
In SDMA (Space Division Multiple Access) wireless transmission systems, the antenna characteristic can be set on the receiver side, using conventional beam forming networks having appropriate adaptation algorithms, so that the useful signal experiences a high antenna gain, while interference signals are strongly suppressed.
German Patent Application No. 41 07 803 A1 describes an arrangement whereby the fixed station is equipped with an antenna array. Depending on the phase modulation, the shape of the beam lobe can be adapted to the objects to be detected. In German Patent Application No. 44 21 573 A1, which describes a receiver arrangement for moving objects, the received signals are weighted and combined into a plurality of signal paths by antenna elements so that each one is assigned by them to a different signal incidence direction of the antenna.
SUMMARY OF THE INVENTION
The present invention provides that the beam characteristic intended for the receiver can also be set for the transmitter. To calibrate the transmitter and the receiver, a calibration network is provided, for which easily implementable adjustment criteria are observed. An advantage of the method according to the present invention is that no high-precision transmitter or receiver is needed. Deviations in the transmission functions of the transmission links to the antenna array have no detrimental effect.


REFERENCES:
patent: 5027127 (1991-06-01), Shnitkin et al.
patent: 5223842 (1993-06-01), Okurowski et al.
patent: 5412414 (1995-05-01), Ast et al.
patent: 5555257 (1996-09-01), Dent
patent: 5631898 (1997-05-01), Dent
patent: 41 07 803 (1992-09-01), None
patent: 44 21 573 (1996-01-01), None
patent: 2 735 937 (1996-12-01), None

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