ISSN 2348-1196 (print) International Journal of Computer Science and Information Technology Research ISSN 2348-120X (online) Vol. 10, Issue 4, pp: (69-85), Month: October - December 2022, Available at: www.researchpublish.com
A Review on SAR Imaging Techniques for Low RCS Targets Sakshi Latthe1, Sagar Mohite1, Latish Tagde1, P.G. Chilveri1, Nargis Akhter2*, A. Arockia Bazil Raj2 Electronics and Telecommunication Engineering, Smt. Kashibai Navale College of Engineering, Vadgaon, Pune, India – 411041
1
RF Photonics Laboratory, Electronics Engineering, Defence Institute of Advance Technology, Pune, India – 411025
2
DOI: https://doi.org/10.5281/zenodo.7485765
Published Date: 27-December-2022
Abstract: The method known as synthetic aperture radar (SAR) is utilized for creating high-resolution photographs stationary scenes. SAR is an imaging radar framed on a moving platform. In radar signal processing discovery of a weakly observable target is one of the most interesting area. In this survey, we will discussabout radar systems. Typical applications of radar include synthetic aperture radar, military application, airborne and spaceborne operation, speed control, air traffic control, and remote sensing. We also study about various imaging techniques that are used. Finally, potential applications of SAR imaging techniques. Keywords: SAR, detection, observable target, imaging techniques, radar system.
1. INTRODUCTION The electromagnetic detection technology known as RADAR, or in order to function, radio detection and ranging emits electromagnetic waves and then observing the reflected waves. Range, angle, and velocity of targets are all determined via radar. Detection shows whether or not the target is present [1]. Thetarget could be either fixed or mobile when the target is stationary, SAR method is employed when the target is not stationary, ISAR is utilized [2]. Ranging shows the separation between the item and the RADAR. Radar can be divided into two categories both active and passive radar are used. An antenna transmits high-frequency radio waves onto the surface of the earth in active radar, which then collects information from the object's backscattered radio waves. Mono-static radars fall under this category [3-6]. The transmitter and the receptor are in the same place in this [6]. The transmitter and the receptor are located in distinct places in a passive radar system. The signalpropagating from a different point is what a passive radar system relies on [7-9]. Bi-static radar is the name given to this type target with a low RCS can be manipulated remotely, usesaerodynamic forces to produce lift, and does not require a human operator [10]. The low RCS targets have more widespread uses in both the military and public spheres. Warfare and spying are just two of the many militaries uses for low RCS targets [11-12]. The civil applications cover things like mountain mapping and other things [13]. The region absorbing the energy that generates in all directions is referred to as the targets RCS (rho) [14]. Low rcs target or small target refers to a target with RCS of under one square meter [15]. Due to its ability to carry explosives, an undefinable low-RCS target at the border might threaten national security by gathering important information and destroying material. An active sensor is largelyresponsible for finding low RCS targets [16-18].
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