OVERVIEW OF THIRD GENERATION SPACEBORNE X-BAND SYNTHETIC APERTURE RADAR (SAR)

The deployment of advanced spaceborne Synthetic Aperture Radar (SAR)systems plays a crucial role in modern Intelligence, Surveillance, and Reconnaissance (ISR) operations, supporting military decision-making across strategic, operational, and tactical levels. This paper investigates engineering solutions for next generation high performance e X-band SAR instruments aimed at overcoming current limitations in resolution and swath width trade-offs.The proposed approach integrates innovative acquisition techniques, including Scan On Receive (SCORE), Multiple Azimuth Processing (MAP), and Digital Beam forming (DBF), enabling simultaneous improvement of geometric resolution and coverage area. The presented system concept targets a resolution of up to 1 m with a swath width of 50 km in Stripmap mode, significantly exceeding the capabilities of existing SAR missions.Performance analysis demonstrates achievable Noise Equivalent Sigma Zero (NESZ) values around -20 dB and Distributed Target Ambiguity Ratio (2D-DTAR)up to -18 dB over a wide range of incidence angles,highlighting enhanced image quality and reliability. The paper also outlines a modular instrument architecture composed of SAR Electronic and Antenna subsystems, designed to support advanced processing and multi-channel calibration.Although not exhaustive, the proposed solutions illustrate the potential impact of next-generation SAR technologies in improving Imagery Intelligence (IMINT) capabilities and expanding operational applications for national defence and security.