CAJ | 학술논문

极坐标格式算法(Polar Format Algorithm, PFA)通常应用于正侧视聚束SAR成像，当PFA应用斜视聚束时，传统沿视线插值(Line Of Sight Interpolation, LOSI)PFA方法会导致方位频谱非等间隔采样。该文针对上述问题提出一种新的方位频谱插值方法，根据斜视聚束的几何模型可以得到方位频谱精确的插值形式，从而实现对方位频谱等间隔重采样。在获得了均匀的频谱后进行2维逆傅里叶变换，便可以得到大范围的斜视聚束场景。为了验证该文算法的有效性，进行了实验仿真及实测数据验证，该方法与传统插值的方法进行比较，能够增大斜视聚束场景范围。
겁좌표격식산법(Polar Format Algorithm, PFA)통상응용우정측시취속SAR성상，당PFA응용사시취속시，전통연시선삽치(Line Of Sight Interpolation, LOSI)PFA방법회도치방위빈보비등간격채양。해문침대상술문제제출일충신적방위빈보삽치방법，근거사시취속적궤하모형가이득도방위빈보정학적삽치형식，종이실현대방위빈보등간격중채양。재획득료균균적빈보후진행2유역부리협변환，편가이득도대범위적사시취속장경。위료험증해문산법적유효성，진행료실험방진급실측수거험증，해방법여전통삽치적방법진행비교，능구증대사시취속장경범위。
For broadside spotlight Synthetic Aperture Radar (SAR) imaging, Polar Format Algorithm (PFA) is applied widely as a kind of general interpolation algorithm. When PFA is applied to the squinted spotlight, coordinate rotation causes azimuth spectrum uniformly resampled. A new method of interpolation for azimuth spectrum is proposed in this paper and the accurate form of azimuth spectrum interpolation is given according to the geometry of squinted spotlight. Azimuth spectrum is resampled according to the accurate form of interpolation and uniform azimuth spectrum is obtained. Then, two-dimension IFFT is implemented and high resolution squinted spotlight image is obtained. In order to validate the effectiveness, simulation and real data are processed by the proposed method. Compared with traditional interpolation method, the scope of well-focused image is increased.