Radar device and antenna device

Abstract

Four rows on the right side of linear arrays arranged at equal intervals in the vertical direction and arranged at a predetermined interval in the horizontal direction form transmission channels and the remaining twelve rows form a reception channel group. Among the linear arrays forming the reception channel group, linear arrays of four rows in the center form reception channels CH5 to CH8 with each one row set as a channel unit. Linear arrays of eight rows on both sides (four rows on one side) form reception channels CH1 to CH4 with two rows set as a channel unit. A reception first array is formed by the reception channels CH5 to CH8. A reception second array is formed by the reception channels CH1 to CH8. In wide angle middle detection processing, signals are combined using the reception first array. In long detection processing, signals are combined using the reception second array. Second null of a radiation pattern by a transmission array and first null of the reception second array are matched. The first null of the transmission array is filled such that a gain difference between the first null of the transmission array and a first side lobe of the transmission array is within a predetermined value.

Description

technical field [0001] The present invention relates to a radar device which transmits and receives continuous waves to detect at least the azimuth where a reflector exists, and a suitable antenna device used in the radar device. Background technique [0002] Conventionally, radar devices that detect reflected objects by transmitting and receiving continuous waves (radar waves) are mounted on automobiles. In addition, this radar device (vehicle radar device) has a plurality of antenna elements arranged at predetermined equal intervals in order to detect the direction of reflectors (such as roadside objects such as guard rails, and preceding vehicles) and to accurately determine the position of reflectors. The array antenna configured above is used as a receiving antenna (see, for example, Patent Document 1). [0003] Patent Document 1: Japanese Patent Application Laid-Open No. 8-181537 [0004] However, in the vehicle-mounted radar device, the traveling speed of the vehicl...

AI Technical Summary

Problems solved by technology

[0008] However, in the case of this method, there is a problem that the area of ​​the receiving antenna becomes larger and the cost increases

In particular, in the case of a vehicle-mounted radar device, the installation place is very limited, and it is difficult to increase the area of ​​the receiving antenna.

Images