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针对逆合成孔径雷达(ISAR)非平稳目标成像,提出基于两特显点相位联合估计成像时间和转速的方法,并得到了转速与相位斜率差(PSD)的解析表达式。首先,基于两个特显点距离单元估计目标转动相位,根据不同时间段转动相位线性度(PLD)选择成像时间。其次,在适合成像的时间段,将成像时间等分成两段,分别提取两段时间内转动相位的斜率。最后,基于两段观测数据PSD估计目标的转速,从而实现目标距离-多普勒(RD)图像的横向定标。仿真和实测数据均验证了本文方法的有效性。
Aiming at the non-stationary target imaging of inverse synthetic aperture radar (ISAR), a method of estimating the imaging time and rotation speed based on the joint of two distinct points and phases is proposed. The analytic expression of speed difference and phase slope difference (PSD) is obtained. First, the target rotation phase is estimated based on two distinct dot distance elements, and the imaging time is selected according to the rotational phase linearity (PLD) for different time periods. Secondly, the imaging time is equally divided into two segments in the suitable imaging time period, and the slopes of the rotational phases in two periods are respectively extracted. Finally, the target rotation speed is estimated based on the two observation data PSD to achieve the horizontal scaling of the target distance-Doppler (RD) image. Simulation and experimental data verify the effectiveness of the proposed method.