| 摘要 |
An incoming direction estimation apparatus estimates an incoming direction of a radar wave and such by using three or more sensors or antennas simultaneously, unlike a conventional incoming direction estimation apparatus. The incoming direction of the radar wave is configured as sin -1 ((1/2Àa)*tan -1 b). "a" is d/» determined by the antenna interval and by the wavelength » of a carrier carrying the radar wave. Simultaneous use of three antennas makes it possible to set a as a value depending on a value d 0 = a 0 » based on the interval between first antennas and value d 1 = a 1 » based on the interval between second antennas. Therefore, if a wide field of vision of an incoming direction is needed, it is only necessary to adjust (d 1 -d 0 )/» = (a 1 -a 0 ), in place of the absolute interval of antennas a =d/», thereby making it possible to lessen a limitation on the design of antennas and set a field of vision of the incoming direction appropriately. To estimate the incoming direction of a signal, the direction ¸ is given by ¸ = sin - 1 �¢ 1 2 �¢ Àa �¢ arg �¢ - 1 ± 1 + 4 �¢ b 2
by setting (y 2 +y 1 )/y 0 = b and a = d/», where y 0 is a signal received by first sensors, y 1 is a signal received by second sensors and y 2 is a signal received by third sensors, and d 1 = d 0 = d.
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