Long Range Passive Surveillance in Anti-Access/Area-Denial Environments

Helios Remote Sensing Systems, Inc. is developing passive surveillance techniques that utilize the wideband signal processing and direction of arrival measurement capabilities of modern signals intelligence/electronic intelligence (SIGINT/ELINT) systems to act as a passive radar system leveraging opportunistic emitters in the operational area to develop and maintain the tactical surface picture in Anti-Access/Area-Denial (A2/AD) environments.  During Phase I, the Helios team is developing passive radar concepts suitable for opportunistic emission exploitation by conceptual modern airborne SIGINT/ELINT systems.  Supporting analyses includes the presence of potential opportunistic emissions in littoral and blue water oceanic regions.  Hypothetical coverage maps are developed for operations in peace time, heightened tensions, and during conflicts.  The concepts consider the relatively modest antenna gain (0-3 dBi) of typical SIGINT/ELINT systems.  The feasibility of coherent signal processing approaches of these opportunistic emissions are considered.  The Phase I effort includes prototype plans to be developed under Phase II.  Based on Phase I results, candidate concept(s) will be matured through more detailed high-fidelity analyses with a focus on a particular SIGINT/ELINT system identified by the Navy sponsor in Phase II.