Contents I. Introduction
In the remote sensing point of view, a SAR system obtains an image of the Earth’s ground surface using airborne or spaceborne radar platform. The SAR image is a result of the SAR signal processing of the chirp pulse signal based on matched filtering as in [1]. Stripmap SAR mode is one of the most widely used mode in various SAR operation modes. The general stripmap mode generates single frame of SAR image from a received raw data block. Therefore, it is impossible to obtain many frames for generating video from a given raw data block. However, if wide Doppler frequency band property is obtained, which is received from wide beam antenna case, multiple images can be generated from a raw data block even on stripmap SAR mode. In the case of low or zero squint, the time difference between each scene becomes negligible and the time numbers for each image do not correspond to the actual time order. Therefore, the sequential images in the low or zero squint cannot be used as sources of video images. The detail conditions for obtaining multiple time order sequential images are given in Section ⊤. In summary, if the wide beam antenna and high squint case conditions are satisfied, we can generate multiple frames by extracting from a single received raw data block, which are suitable for video images. In addition, the wide beam antenna and the degree of high squint are designed according to various experiment conditions for making the order of multiple scenes matched with the actual time order.
