1]. There 163 papers were presented to over 240 attendees with worldwide 17 exhibiting companies. It was a very exciting activity [2] held by IEEE GRSS All Japan Chapter [3] and the Institute of Electronics, Information, and Communication Engineers (IEICE) Electronics Society.APSAR covers a wide variety of SAR and radar related topics including SAR applications, analysis techniques, signal processing, and SAR system design and concepts. In APSAR 2013, "Disaster Monitoring" was the main theme, providing the attendees with an opportunity to think about how each of us can contribute through SAR technology to overcome the hardships after disasters.To further promote research activities in this and relevant areas, IEEE JSTARS planed to publish this Special Issue on Advances in SAR and Radar Technology. The scope of this Special Issue is then identical with that of APSAR 2013 Tsukuba, which ranged over the six topical fields, namely:A. Disaster Monitoring: Contribution of SAR remote sensing on the Great East Japan Earthquake, ALOS2 projects for prediction, mitigation, and restoration, SAR applications for various disasters, and present and future SAR systems and missions in Asia-Pacific region; B. SAR Applications: Land use and land cover, soil and vegetation applications, atmosphere and ocean observation, snow and ice, and coastal and wetlands; C. Analysis Techniques: Electromagnetic modeling, InSAR and high-resolution SAR, POL and POLInSAR, and Bistatic SAR; D. SAR Signal Processing: High-resolution SAR processing, SAR/GMTI/STAP and change detection, image filtering, correction and enhancement, and SAR/ISAR signal processing; E. SAR Systems and Sensors: Spaceborne and airborne SAR systems and missions, advanced and innovative SAR concepts and modes, ground-based systems, and calibration; F. Radar Technology: Radar components and subsystems, antenna technology and adaptive arrays, UWB, GPR, bio-medical imaging radar systems, and automotive radar.