针对弹载SINS/SAR组合导航系统中,导弹机动性会影响SAR成像质量的问题,提出了一种新的Burg-ChirpScaling-Dechirp成像算法。文中构造改进的相位补偿因子,补偿距离徙动造成的影响,采用Dechirp技术对部分孔径数据进行方位聚焦处理,优化算法结构;同时,建立回波信号观测数据的自回归模型,对图像的二维频谱进行外推,弥补经典CS成像算法空间分辨率受限的不足。将新的算法与CS算法进行仿真比较,结果表明,新的成像算法能有效改善点目标成像质量,提高SAR的成像质量。

In the missile-borne SINS/SAR integrated navigation system, there exists the issue that the imaging quality is influenced by distance migration of missile maneuver ability. The paper gives a novel Burg-Chirp Scaling-Dechirp image algorithm. It structures the improved phase compensation factor to compensate the influence caused by range migration. Besides, take Dechirp technology on the part of aperture data in azimuth focus processing to optimize algorithm structure. Meanwhile, by way of establishing the regression model, the two dimensional spectrum of the image is extrapolated, which makes up for the shortage of the limited spatial resolution of the classical CS algorithm. With the compared simulation of the new algorithm and the classical CS algorithm, it shows that the new imaging algorithm can effectively improve the image quality of the point target and get the real-time high resolution SAR image.