| 摘要 |
A method and calibration unit for calibrating a plurality of receiver channels in a multichannel receiver is disclosed. The method comprises the steps of: sampling at each of said receiver channels a transmitted wave having a predetermined frequency range in order to generate calibration data for each of said receiver channels. Transforming the corresponding calibration data, for each said receiver channel, into frequency domain calibration data. Calculating the phase difference, for each of a plurality of frequencies within the predetermined frequency range, between each receiver channel's frequency domain calibration data and the corresponding frequency domain calibration data of a reference channel in order to determine a phase profile for each said frequency. Then creating a phase error profile, for each said frequency, by removing from the corresponding phase profile any phase difference resulting from the timing differences of the wavefront of the transmitted wave reaching each of said receiver channels, so as to generate a set of phase error profiles which together form a correction matrix identifying for each frequency the phase error between receiver channels. By this approach, the wideband phase error across receiver elements of a multichannel receiver can be measured so as to allow correction of a beam pattern produced by the multichannel receiver. This enables the quality of the beam pattern to be improved. |
