Review of the Comprehensive SAR Approach to Identify Scattering Mechanisms of Radar Backscatter from Vegetated Terrain

Abstract

In a field of polarimetric synthetic aperture radar (SAR) remote sensing, various kinds of polarimetric decomposition techniques have been proposed. However, poor validations prevent them from operational applications. A true composition ratio of scattering mechanisms within a radar backscatter plays a key role. To overcome the issue, a novel comprehensive SAR approach to accurately identify a contribution of each scattering mechanism has been introduced. This is based on multiparametric SAR observation combined with a numerical model simulation. In this article, a comprehensive SAR approach is concisely reviewed to accelerate the research in this field. First, popular model-based polarimetric decompositions are introduced and their limitations are shown. Then, a behavior of scattering mechanisms is analyzed by the discrete scatterer model with some results using real multiparametric SAR data. A comprehensive SAR approach must be essential to realize an operational use of polarimetric SAR data.

Synthetic Aperture Radar Flood Detection under Multiple Modes and Multiple Orbit Conditions: A Case Study in Japan on Typhoon Hagibis, 2019

“…The train bridge and some buildings increased the intensity, thus prohibiting the detection of the water. This was caused by the double-bounce effect of SAR images, which is typically seen in urban areas [42,43]. On the other hand, a current operational digital elevation model (DEM) / digital surface model (DSM), such as SRTM, does not represent the height of the scatterers themselves, thus observing from a different orbit creates a local co-registration error for those scatterers, resulting in a false flood detection alarm.…”

Special Issue on “Advanced Technology Related to Radar Signal, Imaging, and Radar Cross-Section Measurement”

“…All of these accepted papers are the latest research results and are expected to be further advanced, applied, and diverted. For example, [32] introduces the analytical approach for the development of radio frequency microelectromechanical switches, and [33] explains the comprehensive SAR approach for identifying the scattering mechanisms of radar backscatter caused by vegetated terrains. This Special Issue's editors hope that these papers attract much attention in the research and development of radar technology.…”

Focusing Arc-Array Bistatic Synthetic Aperture Radar Data Based on Keystone Transform

“…A synthetic aperture radar (SAR) has all-weather, all-day, high-resolution and multi-dimensional imaging capabilities [1][2][3][4][5][6][7]. The traditional linear array SAR (LA-SAR) [8][9][10][11] can only observe the front area of the antenna array unit from a single angle of view.…”