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Calibration of a DBF Receiving Array Antenna by Using a Reference Sequence for Systems in Power-Limited Channels
Takashi NAKAMURA Ryu MIURA Masayuki OODO Tetsushi IKEGAMI
IEICE TRANSACTIONS on Communications
Publication Date: 2002/03/01
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Antenna and Propagation
array antenna, calibration, digital beam forming,
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A method for fast calibration of digital-beam-forming (DBF) receiving array antennas by means of digital signal processing is described. It uses plane wave arriving from a known direction that contains a known reference sequence. Non-uniformities of the amplitude and phase in the branches are detected and calibrated in real time by the complex correlation of a replica of the known reference sequence with the received signal obtained from the output signals of each element. No special circuit for calibration is required, and the non-uniformities can quickly be compensated for by digital signal processing even for an array antenna with many antenna elements. This method enables highly accurate calibration of large-scale array antennas operating at a high frequency even under a low signal-to-noise power ratio (SNR).