This month´s covers…

Front cover: The CORA (covert radar) experimental passive radar developed by Fraunhofer-FHR, Germany features a multichannel digital radar receiver and a circular antenna array with separate elements for the VHF- and the UHF-range. It is used to exploit digital audio (DAB) or video broadcasting (DVB-T) signals. The photograph featured on the cover of this issue of the IEEE Aerospace & Electronic Systems Magazine is a portable CORA experimental radar, antenna array and front end. This radar antenna can be deployed and relocated in a situation of national conflict as a stand-in for broadcast and military radar infrastructure that has been destroyed. [From the article in this issue entitled, "A Multi-Frequency Hybrid Passive Radar Concept for Medium Range Air Surveillance," by O´Hagan, Kuschel, Ummenhofer, Heckenbach, and Schell. See pages 6-15] Back cover: The back cover of this issue pictures the SELEX Sistemi Integrati Passive Coherent Location Radar, AULOS. This passive coherent location system was developed at the SELEX Sistemi Integrati facility in Rome, Italy. The mobile passive radar is designed to add transportability to the features of multistatic, multifrequency configuration, and multiband architecture. The mobile system is made of an antenna group and of a mobile operations center. The mobile passive radar is versatile, operates in a covert manner in various geographic areas, and uses electromagnetic emissions in different bands. The deployable passive system could solve the problem of detecting small air targets in mountain areas. Courtesy of SELEX Sistemi Integrati- A Finmeccanica Company. [From the article in this issue entitled, "Use of a Graphic Processing Unit for Passive Radar Signal and Data Processing," by Bernaschi, Di Lallo, Farina, Fulcoli, Gallo, and Timmoneri. See pages 52-59.]