| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve the capability of detecting a plurality of still target objects without increasing the number of antenna elements. <P>SOLUTION: Operations of transmitting/receiving FMCW waves are repeated as many times as the required number of necessary snapshots, and the center frequencies of the FMCW waves are changed for each transmit/receive operation (S110 to S130). For each transmit/receive operation (snapshots SSi, i=1 to 4), a frequency spectrum is obtained by performing FFT processing for beat signal data. Data x<SB>1</SB>(k) to x<SB>N</SB>(k) on target frequencies k that appear as peaks on the frequency spectrum are extracted from all received channels CH<SB>1</SB>to CH<SB>N</SB>. A sequence of received vectors Xi(k) is generated, and the respective correlation matrices Rxx_ssi(k) of the received vectors Xi(k) are obtained. Furthermore, the correlation matrices Rxx_ssi(k) are averaged (time-averaged) for each target frequency k to give an average correlation matrix HRxx(k). From the average correlation matrix HRxx(k), a MUSIC spectrum is derived, whereby the azimuth directions of existing target objects are obtained (S140 to S180). <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
