Synthetic Aperture Radar Interferometry: Utilizing Radar Principles

Abstract

One of the most important applications of synthetic aperture radar interferometry (SARIF) is making a geometrical plot of observed points on the ground surface. For that purpose, we derive the two points' distances using a radar principle. Mathematically, this problem is a two-unknown-variables problem. To solve, it we need only two equations. Due to limitations of the measured distances by radar, we require one more equation. The availability of the data is carefully investigated. Then, we obtain a very clear expression for the parallel and perpendicular components of the distance. The perpendicular component is expressed by the difference of the measured phase differences with an extremely large amplifier. We discuss the conversion of the measured phase differences, the plot of which is an interferogram, to distance. We present a numerical example that verifies the likelihood of obtaining the difference of the phase differences. We also show the phase differences and calculate the perpendicular component for the Advanced Land Observing Satellite-Phased Array-Type L-Band Synthetic Aperture Radar (ALOSPALSAR). The plot of ground points is very noisy; therefore, we must improve our calculation by reconsidering the coregistration calculation.