| 摘要 |
<p>PURPOSE:To make it possible to detect the arriving directions of a plurality of radio waves having the large level differences at the same time. CONSTITUTION:N pieces (N is 3 or more) of antennas 111-11N are provided at an equal interval on the same circle. The radio waves through the antennas are received by receivers 121-12N, respectively. The signals are converted into the intermediate frequencies and amplified. As the intermediate-frequency amplifier at the final stage, a logarithmic amplifier 18 is provided, respectively. The outputs of the receivers 121-12N are converted into the digital signals with digital processing parts 231-23N, respectively. Then, the signals undergo logarithm- linearily conversion. Thereafter, the signals undergo discrete Fourier transformation. The Fourier-transformed signals are processed in a data processing part 24 by a music method. The directions and the levels of a plurality of the arriving signals are detected within the range of (N-1).</p> |
