摘要 |
A wide monitor area can be covered by switching the connection between a plurality of sensors (102-l-102-m, A1-A4, 601~605) and a transmission/reception device (101, 200, 209, 210) using a switch device (103, 201, 202, 606) of a target detection apparatus in a time division manner. When only two target detection apparatuses (S 1 , S 2 ) are used in positioning a target, the position of a target can be identified according to the information about an area (402) common to both angle ranges (SR 11 , SR 12' SR 13 , SR 21 , SR 22 , SR 23 ) covered by the two apparatuses or the total propagation distance information from one apparatus to the other apparatus through each target.
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