CAJ | 학술논문

针对加速度在合成孔径雷达运动目标检测中会产生三次相位影响静止目标抑制和参数估计精度的问题，提出基于三次相位补偿的参数估计方法。在分析信号模型的基础上，通过在时间?调频率平面内采用类似Dechirp和一维搜索的方法实现三次相位的补偿；完成相位补偿后，为克服某些时频分布中峰值重叠可能带来的目标丢失问题，利用改进的分数阶傅里叶变换方法进行运动目标参数估计，并给出了具体的参数估计方法。最后，计算机仿真验证了该方法的正确性和有效性。
침대가속도재합성공경뢰체운동목표검측중회산생삼차상위영향정지목표억제화삼수고계정도적문제，제출기우삼차상위보상적삼수고계방법。재분석신호모형적기출상，통과재시간?조빈솔평면내채용유사Dechirp화일유수색적방법실현삼차상위적보상；완성상위보상후，위극복모사시빈분포중봉치중첩가능대래적목표주실문제，이용개진적분수계부리협변환방법진행운동목표삼수고계，병급출료구체적삼수고계방법。최후，계산궤방진험증료해방법적정학성화유효성。
Target acceleration of SAR moving target detection results in three-phase, and affects stationary target suppression and the precision of parameter estimation. Aiming at this problem, a parameter estimation method based on three-phase compensation is proposed. According to the analysis of signal model, phase compensation is achieved by dechirp and one-dimensional search in time-chirp distribution. After the phase compensation, in order to overcome potential problem of target loss caused by peak overlap in time-frequency distribution, an improved FrFT is employed for parameter estimation and the method is given in detail. Finally, the computer simulation confirms the correctness and validity of the method.