【作者】 刘宗政； 何峰； 叶钒； 董臻；

【Author】 Liu Zongzheng,He Feng,Ye Fan,Dong Zhen (College of Electronic Science and Technology,National Univ.of Defense Technology,Changsha 410073,China)

【机构】 国防科技大学电子科学与工程学院；

【摘要】 在ISAR成像中,转角估计是对ISAR图像进行正确横向定标的基础。本文将各个距离单元的回波近似为多分量线性调频信号,根据转角与回波信号的二次相位系数之间的关系,提出采用乘积型三次相位函数(PCPF)估计二次相位系数来求得转角。PCPF具有较高的计算效率,并在信噪比较低的条件下具有很好的性能,更适于实测数据处理和实时处理。实测数据结果验证了本文方法的有效性。更多还原

【Abstract】 In ISAR imaging,the estimation of rotation angle is the fundament of cross scaling of ISAR image.In this paper,a novel method based on Product Cubic Phase Function(PCPF) is proposed.The novel method approximates signals in different range bin to multi-component chirp signals,and obtains rotation angle from second-order phase coefficient,by use of PCPF.PCPF is more suitable for real data processing and real time signal processing,which has high computational efficiency and good performance at low SNR conditions.Finally,the validity of the novel method is tested on the real data.更多还原