*3.1. Data*

We conduct experiments on the public data released by Sandia National Laboratories [49]. This video SAR data is the only publicly available, thus it is selected. It is the video SAR footage of a gate at the Kirtland Air Force Base Eubank Gate. Table 2 shows the radar system parameters of this data. Figure 15 shows the experimental working environment of the optical image and the corresponding SAR image.

**Table 2.** Radar system parameters of the public Sandia National Laboratories (SNL) video SAR data.


**Figure 15.** Experimental working environment of the SNL video SAR data at the Kirtland Airforce Base Eubank Gate. (**a**) The optical image; (**b**) the corresponding SAR image.

There are 900 frames of continuous SAR images in the SNL video data. The image size is 660 pixel × 720 pixel. We divide the raw video into nine sub-videos, i.e., one sub-video contains 100 continuous SAR image sequences. The moving target shadow ground truths are labeled by professional experts. The first six sub-videos, i.e., 600 continuous SAR images, are selected as the training dataset. The remaining three sub-videos, i.e., 300 continuous SAR images, are selected as the test dataset. This data is available https://www.sandia. gov/app/uploads/sites/124/2021/08/eubankgateandtrafficvideosar.mp4 (accessed on 20 November 2021) where related scholars can download it for free for scientific research.
