共形天线阵元位置误差校正的辅助阵元法

共形天线的安装和测量以及载体平台表面的变形和振动均会引起阵元位置误差，严重影响共形天线的测向性能。通过设置４个方位未知的精确校正的辅助阵元，实现了共形天线大尺度三维的阵元位置误差校正。给出了阵元位置误差条件下共形天线导向矢量的方位依赖的幅相误差等效表示模型；基于子空间原理得到等效的方位依赖的幅相误差估计，进而得到共形天线阵元的三维位置误差估计。该方法可以实现共形天线校正信源来波方位和阵元三维位置误差的联合但“去耦”估计。计算机仿真结果验证了共形天线阵元位置误差校正的辅助阵元法的有效性

Array Shape Calibration for Conformal Antenna with Instrumental Sensors

Both of the installation and measurement of conformal antenna cause position errors of its elements. And its supporting structure is also subjected to deformation and vibration. As a consequence, the positions of its elements change. Its performance of direction finding is seriously affected. In this paper array shape calibration algorithm for conformal array antenna is developed by using four accurately calibrated instrumental sensors with unknown DOAs. The array steering vector in the presence of position errors is expressed as angularly dependent gain and phase uncertainties. The angularly dependent gain and phase uncertainties are estimated based on subspace direction finding technique. And then the 3D position errors of the elements are calculated sequentially. The proposed calibration method can estimate the DOAs of the auxiliary calibrating sources and the position errors jointly. Computer simulation demonstrates that the proposed algorithm is effective.