| 摘要 |
<p>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. An arithmetic expression for estimating an incoming direction of a radar wave is configured as sin -1 ((1/2 a)*tan -1 b). The "a" is d/» determined by an antenna interval and by a wavelength » of a carrier, or such, carrying the radar wave. A simultaneous use of three antennas makes it possible to set the 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.</p> |
