Adaptive array antenna

Claim 2

An adaptive array antenna characterized in that said adaptive array antenna comprises a plurality of array antennas including a plurality of antenna elements which are spaced at intervals at which a large correlation is exhibited; said array antennas being spaced at intervals at which the correlation is negligible; each of said array antennas performing adaptive signal processing independently; each output of said array antennas processed by adaptive signal processing being further processed by adaptive signal processing.

Claim 3

An adaptive array antenna characterized in that said adaptive array antenna comprises a plurality of array antennas including a plurality of antenna elements which are spaced at intervals at which a large correlation is exhibited; said array antennas being spaced at intervals at which the correlation is negligible; at least an array antenna of said array antennas performing adaptive signal processing; array antennas which do not perform adaptive signal processing referring to a result of said adaptive signal processing of other array antennas and adjusting phase and level of outputs of antenna elements of said array antennas which do not perform adaptive signal processing.

Claim 4

The adaptive array antenna as claimed in one of claims 1 - 3, wherein said adaptive signal processing is an interference suppression tracking type or a maximum gain tracking type.

Claim 5

The adaptive array antenna as claimed in one of claims 1 - 4, wherein signals to which weights are assigned by said adaptive signal processing are synthesized before detection or after detection.

Claim 6

An adaptive array antenna characterized in that said adaptive array antenna comprises: an array antenna having a plurality of antenna elements; a multi-beam synthesizing circuit for synthesizing multiple beams; a calibration signal coupling part, provided between said multi-beam synthesizing circuit and said antenna element, for inputting a calibration signal; a calibration signal generator; a calibration amount calculator; wherein said calibration signal generator applies a calibration signal output to said calibration signal coupling part, said calibration amount calculator calculating a calibration amount for each of receiving systems from baseband signals of said receiving systems connected to the outputs of said multi-beam synthesizing circuit and performing calibration to said receiving systems.

Claim 7

An adaptive array antenna characterized in that said adaptive array antenna comprises: an array antenna having a plurality of antenna elements; a multi-beam synthesizing circuit for synthesizing multiple beams; a calibration signal coupling part, provided between said multi-beam synthesizing circuit and said antenna element, for inputting a calibration signal; a calibration signal generator; a calibration amount calculator; wherein said calibration signal generator applies a calibration signal output to a plurality of said calibration signal coupling parts successively, said calibration amount calculator calculating a calibration amount for each of the receiving systems from baseband signals of said receiving systems connected to the outputs of said multi-beam synthesizing circuit every time said calibration signal output is applied to said calibration signal coupling part, and calibration to said receiving systems being performed by using a mean value of calculated calibration amounts.

Claim 8

The adaptive array antenna as claimed in one of claims 6 or 7, wherein an FFT processing circuit is provided for performing calculation of multi-beam resolution within a base station in the outside of said receiving systems of said array antenna.

Claim 9

A calibration amount calculation method in a receiving system of an array antenna having a plurality of antenna elements, said calibration amount calculation method characterized by: applying a calibration signal generated by a calibration signal generator to a calibration signal coupling part provided in one antenna element; sending said calibration signal to a plurality of said receiving systems by a multi-beam synthesizing circuit; and calculating a calibration amount of each of said receiving systems from baseband signals obtained by detecting calibration signals of said receiving systems.

Claim 10

A calibration amount calculation method in a receiving system of an array antenna having a plurality of antenna elements, said calibration amount calculation method characterized by: applying a calibration signal to calibration signal coupling parts provided in a plurality of antenna elements successively; sending said calibration signal to a plurality of said receiving systems by a multi-beam synthesizing circuit provided in an array antenna simultaneously; calculating, by a calibration amount calculator connected to a plurality of said receiving systems, calibration amounts of said receiving systems from baseband signals obtained by detecting calibration signals of said receiving systems; using a mean value of said calibration amounts as a calibration amount of said receiving system.

Claim 11

The calibration amount calculation method of said receiving systems of said adaptive array antenna as claimed in claim 9 or 10, wherein verification of calibration amount calculation is available by providing, in the outside of said receiving systems of said array antenna, an FFT processing circuit for performing calculation of multi-beam resolution within a base station.

Claim 12

A calibration method for performing calibration of a receiving system of an array antenna by performing adaptive signal processing, said calibration method characterized by performing adaptive signal processing after subtracting said calibration amount calculated by the method claimed in claim 9 or 10 as an adaptive signal processing amount when performing adaptive signal processing for an adaptive array antenna.