JP2016148591A5 - - Google Patents

Claims (5)

An arrival direction estimation device (33, 34) for estimating an arrival direction of an incoming wave according to received signals from m (m is an integer of 3 or more) antenna elements constituting an array antenna (31, 32),
The array antenna is composed of n (1 <n <m) antenna elements, and each of the partial array antennas selected so that the center positions of the antenna elements in the arrangement direction are different from each other. A first azimuth candidate calculation unit (333: S210 to S260) for determining the arrival directions of all incoming waves received according to the received signal from the partial array antenna;
A direct wave selection unit (333: S270 to S270) that selects a direct wave coming directly from the transmission source by comparing the arrival directions of the incoming waves obtained for each of the partial array antennas by the first orientation candidate calculation unit. S280),
An arrival direction determination unit (333: S110 to S140, S160) that determines an estimation result of the arrival direction using the arrival direction of the direct wave selected by the direct wave selection unit;
With
The arrival direction determining unit
A second azimuth candidate calculation unit (333: S110 to S140) that estimates an arrival direction of the incoming wave according to reception signals from more antenna elements than the antenna elements that constitute the partial array antenna;
Selection means (333: S160) that selects the closest direction to the arrival direction of the direct wave selected by the direct wave selection unit from the arrival directions calculated by the two-azimuth candidate calculation unit (333: S160) )When,
It further comprising a arrival coming direction estimation apparatus.   The direct wave selection unit obtains an angle difference between arrival directions based on the same arrival wave for each arrival direction detected by any two partial array antennas by the first direction candidate calculation unit, and the angle difference is the maximum. The arrival direction estimation apparatus according to claim 1, wherein the incoming wave is selected as the direct wave. Three or more partial array antennas are set,
The direct wave selection unit calculates the angle difference for all combinations of the partial array antennas, and selects the direct wave using an average or majority result of the angle difference for each incoming wave. The arrival direction estimation apparatus according to claim 2. The number m of the antenna element, the maximum number of the reflected wave is assumed as p, any claims 1, characterized according to claim 3 that is set so as to satisfy m ≧ 2 × (p + 1 ) The arrival direction estimation device according to item 1. As the partial array antenna, an antenna using n antenna elements continuous from one end of the array antenna and an antenna using n antenna elements continuous from the other end of the array antenna are used. The arrival direction estimation apparatus according to any one of claims 1 to 4 .