So a separate rotating aerial is used for that purpose . 为此需要用一种单独的旋转天线。
2.
Phase center error : 2 rotation antenna s phase center error 4mm 相位中心： 2旋转天线相位中心误差4mm 3
3.
Phase center error : 2 rotation antenna s phase center error 2mm 相位中心： 2旋转天线相位中心误差2mm 3
4.
Information is collected through the use of special rotating antennae found on the two strands that form the helix and located where each strand intersects with its four ladders 通过使用在二条里发现的特别旋转天线收集信息，二条形成螺旋状用它的四个阶梯固定在每条横断面上。
