Ultra-wideband direction-finding positioning array antenna suitable for long and narrow space and positioning method thereof

The invention provides an ultra-wideband direction-finding positioning array antenna suitable for a long and narrow space and a positioning method thereof, and relates to the field of navigation positioning and communication. The array antenna comprises nine antenna array elements arranged on a horizontal line and a vertical line which are vertically intersected, the horizontal line is located in the horizontal plane, the vertical line is perpendicular to the horizontal plane, and the horizontal line and the vertical line are divided into four branches by intersection points; in the nine antenna array elements, one antenna array element is located on the intersection point, the other eight antenna array elements are divided into two groups, the four antenna array elements in the first group are located on the four branches respectively, the distance between the four antenna array elements in the first group and the intersection point is half-wavelength, and the four antenna array elements in the second group