Stealthy Radiofrequency-based Alternative Positioning, Navigation, and Timing (STRAP)

Period of Performance: 06/17/2016 - 12/16/2016


Phase 1 SBIR

Recipient Firm

Charles River Analytics, Inc.
625 Mount Auburn Street Array
Cambridge, MA 02138
Firm POC
Principal Investigator


GPS performance can be degraded or disabled by radiofrequency (RF) jamming, RF interference, cyberattacks on satellite controls, or attacks on satellites/ground stations. Given these GPS vulnerabilities, military systems must be Navwar complianti.e., not reliant on a single source of positioning, navigation, and timing (PNT) data. Possible alternative PNT technologies include E-LORAN; improved inertial navigation (NAV); terrain-following, gravimetric, and geomagnetic systems; vision-based NAV; improved celestial NAV; and systems that exploit RF signals of opportunity. However, no current PNT technology provides covert, jam-resistant localization with accuracy comparable to GPS. To enable accurate NAV in contested environments, Charles River Analytics proposes to design and demonstrate a system for Stealthy RF-based Alternative PNT (STRAP). STRAP will meet three requirements. First, STRAP will use an innovative, RF-based localization technology that is covert, jam-resistant, GPS-independent, and as accurate as GPS. Second, STRAP software will intelligently fuse data from multiple sensors and localization sources (based on their real-time availability and accuracy) to generate accurate estimates and ensure adaptable, robust performance under varying conditions. Third, STRAP hardware will be small, lightweight, and low-power to be compatible with platforms such as F-35 Joint Strike Fighters, unmanned aerial vehicles (UAVs), and precision guided munitions (PGMs).