Synthetic Aperture Radar Interferometry

Nowadays, the interferometric synthetic aperture radar (InSAR) is regarded as a potent instrument for Earth observation. It helps in extremely precise surveillance of tiny surface movements. The most important thing is that it works at night and even in any weather conditions. In this chapter, the basic concepts of InSAR are described. It goes over how to record SAR signals, analyze phase differences, and use this technique to create digital elevation models (DEMs). The history of the development of InSAR is discussed, starting with its initial experimental use and up to its use in modern satellite missions. These include Sentinel-1, TanDEM-X, ERS, SRTM, and the upcoming NISAR mission. Numerous practical uses of InSAR are also investigated. They are topography mapping, glacier monitoring, volcano observation, urban structure checking, and earthquake change tracking. Some advanced InSAR methods are also mentioned in this chapter. These include multi-temporal InSAR (MT-InSAR), polarimetric InSAR (PolInSAR), persistent scatterer interferometry (PSI), and differential InSAR (DInSAR). Both methods have advantages when it comes to long-term monitoring of environmental and natural hazards. Some of InSAR's limitations are also discussed. These are issues like atmospheric disturbances and loss of coherence with time. InSAR technology is expected to evolve in the future with the help of artificial intelligence. The next generation of higher-resolution radar satellites is also going to be critical. This chapter is aimed at giving an overview of InSAR. It also gives a prospective understanding that would be of assistance to researchers, practitioners, and students in the geoscience and remote sensing professions.