| 摘要 |
An antenna system comprises a main antenna for use of transmission and reception and a pair of sub-antennas use of only reception. The antenna beam of the system is scanned in the direction of a beam width to be compressed. Both received signals of the main antenna and the sub-antennas are fed to a signal processing circuit. The signal processing circuit converts these received signals to power signals and then performs signal processing on them. In this signal processing, the power signal received by the main antenna is output as a final output signal only if both double differential coefficients of the received signals received by the main antenna and the sub-antennas are equal to or less than corresponding predefined positive real number values, and if the phase difference between the power signal received by the main antenna and the power signal received by the sub-antennas is equal to or less than 90 DEG , thereby producing the output signal representing faithfully the distribution of scattering objects without distortion.
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