Lin Qiang, Li Shiqiang, Yu Weidong
Department of Space Microwave Remote Sensing System, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China.
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
Sensors (Basel). 2024 May 14;24(10):3122. doi: 10.3390/s24103122.
Multistatic synthetic aperture radar (SAR) is a special mode of SAR system. The radar transmitter and receiver are located on different satellites, which brings many advantages, such as flexible baseline configuration, diverse receiving modes, and more detailed ground object classification information. The multistatic SAR has been widely used in interferometry, moving target detection, three-dimensional imaging, and other fields. The frequency offset between different oscillators will cause a modulation phase error in the signal. Therefore, phase synchronization is one of the most critical problems to be addressed in distributed SAR systems. This article reviews phase synchronization techniques, which are mainly divided into two methods: synchronization by direct microwave link and synchronization by a data-based estimation algorithm. Furthermore, the future development of synchronization technology is anticipated.
多基地合成孔径雷达（SAR）是SAR系统的一种特殊模式。雷达发射机和接收机位于不同卫星上，这带来了许多优势，如灵活的基线配置、多样的接收模式以及更详细的地物分类信息。多基地SAR已广泛应用于干涉测量、动目标检测、三维成像等领域。不同振荡器之间的频率偏移会在信号中引起调制相位误差。因此，相位同步是分布式SAR系统中需要解决的最关键问题之一。本文综述了相位同步技术，主要分为两种方法：通过直接微波链路进行同步和通过基于数据的估计算法进行同步。此外，还对同步技术的未来发展进行了展望。
