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

A method for calibrating the gain,phase and location of the transmit array based on FFT is presented,where the features of bistatic 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 directions 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.