（電磁散射重點實驗室，北京，100854）

摘要：在轉臺目標雷達成像中，受轉臺架設條件所限，定標球中心難以與轉臺中心嚴格對準，使得利用定標球對目標進行定標成像時出現散焦。本文從理論上分析了定標球偏心對定標后目標成像數據相位的影響，推導了定標球相位與其偏心位置的關系，基于最小二乘方法估計了定標球偏心位置參數，修正了偏心球定標引入的目標成像相位誤差。仿真和實測數據結果表明，該方法可以正確估計定標球偏心位置參數并修正定標引入的相位誤差，從而改善了目標成像效果。

關鍵詞：轉臺成像；定標；相位誤差修正；最小二乘估計

The Research of Calibration Phase Error Correction

in Turntable Target Radar Imaging

QIAN Bo, FENG Xiao-bin, CHEN Jun-wen

( Science and Technology on Electromagnetic Scattering Laboratory, Beijing, 100854,China )

Abstract: In the turntable target radar imaging, because of the actual limitations of the rotary table, it is difficult to make the calibration ball’s center strictly aligned with the rotary table’s center. It would result in diffusion of focus in azimuth orientation in the target imaging when our take this inaccurate calibration ball data to calibrate the target imaging data. Firstly, this paper analyses the influence of the inaccurate calibration ball data to the phase of target imaging data calibrated. Secondly, based on the theoretical derivation analysis, the Least Square (LS) parameter estimate method is used to estimate the parameters of the calibration ball actual location. Finally, it corrects this phase error. Simulation and measurements results show that this method can correctly estimate the calibration parameters and correct the introduced calibration ball eccentric position phase error to improve the target imaging.

Keywords: turntable imaging; calibration; phase error correction; Least Square (LS)