基于FFT的双基地综合脉冲孔径雷达发射阵校准

Transmit Array Calibration for Bistatic Synthetic Impulse and Aperture Radar Based on FFT

本文结合高频岸-舰双基地综合脉冲孔径雷达(SIAR)的特点,利用接收到的直达波信号以及全球定位系统(GPS)测得的接收站位置信息,提出基于FFT的发射阵增益、相位以及位置误差校准方法.仅存在增益和相位误差时,校准需已知一个接收站方位;增益、相位和位置误差都存在时,需要三个接收站方位.文中推导了对这三个接收站方位的要求,研究了接收平台运动和存在多径效应时的校准方法,分析了GPS角定位误差对校准的影响.计算机仿真表明了该方法对发射阵的增益、相位以及位置误差具有良好的校正性能.由于无需精确校准的辅助阵元或方位精确已知的辅助信源,并且运算量小,该方法易于工程实现.

A method for calibrating the gain,phase and location of the transmit array based on FFT is presented, where the features of bistafic Sythetic Impulse and Aperture Radar （SIAR）, the received direct wave and the receiver direction measured by Global Position System （GPS） are employed. One receiver direction is necessary for the gain and phase calibration, while three di- rections are needed for the gain, phase and location calibration. A discussion is made of the requirement for the three directions and the calibration in the presence of moving receiver and multi-path. The effect of GPS measurement uncertainty is analyzed. The computer simulation shows that the performance of the calibration method is high. The method can also be easily implemented owing to its small amount of computation and no need for accurate auxiliary antenna or auxiliary sources.