CAJ | 학술논문

建立双基地SAR的单基地等效模型,分析了系统时间同步误差的机理:提出了双基地SAR回波中的直达波数据进行时间同步误差校正的算法;在双基地SAR单站等效模型的基础上,利用时变阶梯变换算法进行成像处理.经过理论分析,实测数据处理验证,这一算法是有效的,能够校正双基地SAR时间同步误差,较好地进行实测数据的成像处理.
건립쌍기지SAR적단기지등효모형,분석료계통시간동보오차적궤리:제출료쌍기지SAR회파중적직체파수거진행시간동보오차교정적산법;재쌍기지SAR단참등효모형적기출상,이용시변계제변환산법진행성상처리.경과이론분석,실측수거처리험증,저일산법시유효적,능구교정쌍기지SAR시간동보오차,교호지진행실측수거적성상처리.
The signal processing in the bistatic SAR case is more complex than the monostatic synthetic aperture radar (SAR)case due to issues such as the range history of the target echo signal,time synchronization error,time-varying Doppler rate because of squint,etc. In this paper,a monostatic equivalent geometry model of bistatic SAR is established; the mechanism of the System time synchronization error is analyzed; a time synchronization error correction method based on direct-path signal is presented; a modified time-varying step transform algorithm is used for bistatic SAR. Theoretical analysis and experimental data processing confirmed the effectiveness of the algorithm.