Key research themes
1. How can spotlight SAR mode processing algorithms be optimized for high-resolution imaging and computational efficiency?
This research area investigates computational approaches and algorithmic strategies to process spotlight Synthetic Aperture Radar (SAR) data effectively. The spotlight mode offers extremely high azimuth resolution through antenna beam steering over a fixed ground area, but this introduces challenges such as azimuth spectral folding and large processing arrays. Efficient data focusing with preserved image quality and resolution is crucial, motivating studies of novel processing algorithms, two-step approaches, and frequency scaling methods to balance between computational load and precision.
2. What advantages and surveillance potentials arise from employing geosynchronous SAR (GEO-SAR) as an illuminator in passive or parasitic radar configurations?
This theme explores the use of GEO-SAR satellites, which provide continuous illumination over large Earth areas, as non-cooperative illuminators of opportunity for passive bistatic radar receivers. The permanent coverage and radar-optimized waveform of GEO-SAR signals enable low-complexity receiver deployments on ground, airborne, or maritime platforms, suitable for varied surveillance tasks without dedicated transmitters. The research includes scenario assessments, receiver configuration designs, and analyses of achievable detection performance, emphasizing economical and stealth benefits from parasitic exploitation of GEO-SAR signals in military and civil contexts.
3. How can high-resolution spotlight SAR data contribute to archaeological prospection and cultural heritage site monitoring?
This research area investigates applications of high spatial and temporal resolution spotlight SAR data, notably from the COSMO-SkyMed constellation, to detect subsurface and surface archaeological features, monitor landscape changes, and assess structural stability of heritage sites. The studies focus on interpreting SAR backscatter signatures, interferometric coherence, and derived digital elevation models (DEMs) to identify buried structures and anthropogenic disturbances over diverse environments worldwide. The work addresses accessibility issues, data processing challenges, and encourages integration of spotlight SAR into archaeological remote sensing workflows.
4. What technical constraints affect performance and data quality in synthetic aperture imaging radiometers and multi-antenna SAR arrays?
This theme focuses on the impacts of antenna design parameters—especially antenna spacing—on image stability and accuracy in synthetic aperture radiometers and SAR interferometric arrays. It includes investigations into the mathematical and physical effects arising when antenna spacings fall below geometrical limits, causing synthesized fields of view wider than individual antenna fields resulting in unstable inversion and phantom artifacts in brightness temperature maps. The research addresses implications for sensor array design, signal inversion stability, and image fidelity under noise influence.
