Whisper Hunter ® Direction Finder

WHISPER HUNTER ® DIRECTION FINDER

High-speed, wideband RF detection and classification of signals in congested spectrum environments

The Whisper Hunter® direction finder in-depth view of the type and angle is a high-speed, wideband radio of arrival of signals in their area of frequency (RF) direction finding (DF) operations. When combined with a system, capable of detecting various radar and EO/IR camera, the Whisper signals of interest in contested and Hunter system becomes an integral congested spectrum environments. part of a system of systems like SRC's Silent Archer® counter-UAS DETECTING AND CLASSIFYING technology suite. SIGNALS OF INTEREST Detecting and accurately locating Low-SWaP Rugged Hardware signals is crucial to improving The low size, weight and power situational awareness and giving (SWaP) design of the system enables warfighters the information they need integration on a variety of SWaP to complete their missions safely. constrained platforms, including unmanned ground vehicles, manned The Whisper Hunter DF system HMMWV and Stryker platforms. is capable of passively detecting, locating and classifying a variety of The Whisper Hunter DF system signals − from unmanned aircraft has been designed for operation systems (UAS) and their controllers, in a variety of situations to technologies such as OcuSync, deliver persistent, passive Lightbridge and NTSC, to radios and spectrum surveillance. other general energy signals. Once a signal is detected, the system APPLICATIONS ABOVE: The Whisper Hunter direction finder on riser provides lines of bearing (LOBs) for • Counter-UAS the signal. • Navigation warfare (NAVWAR) The system leverages a novel four • NAVWAR situational element custom antenna array for awareness (NAVSENSE) full 360° azimuth coverage, and fast • Spectrum sensing frequency scanning for coverage • UAS traffic management THE WHISPER HUNTER across multiple RF bands. DIRECTION FINDER GIVES FLEXIBLE DESIGN TO MEET BENEFITS WARFIGHTERS THE ABILITY • Full simultaneous 360° coverage MISSION REQUIREMENTS TO PASSIVELY DETECT The Whisper Hunter system is • Wideband frequency coverage designed to be flexible and can reduces spectrum blind spots AND CLASSIFY SIGNALS operate as a standalone unit or as part • Passive operation decreases OF INTEREST of a multi-system integrated solution. chances of detection • Library of signatures for commonly As a standalone unit, the Whisper used commercial UAS enables Hunter system gives operators an rapid classification of signals WHISPER HUNTER® DIRECTION FINDER

SPECIFICATIONS • Detectable signals and protocols FEATURES • Power - Continuous wave - Input: 12-15 VDC - Amplitude/frequency modulation Passive low probability of - Typical consumption: ~45W - Phase shift keying detection, low probability of intercept (LPD/LPI) operation - Optional power supplies - Direct sequence available for 120/240 VAC or spread spectrum 28 VDC operation - Frequency hopped Four element custom spread spectrum antenna array for 360° • Weight: 32.5 lbs - DJI Lightbridge video azimuth coverage • Height: 17.5 in - OcuSync video Four coherent • Diameter: 14 in - Additional signals, protocols receive channels and target types can be added • Operating frequency: 395 MHz- upon request Can be cued to provide 6000 MHz LOBs via external systems, • Azimuth coverage: 360° or run static target lists • Elevation coverage: -32° to +48° Directed search mode for from horizontal manual tasking

BELOW: The Whisper Hunter direction finder integrated on Stryker platform and commercial pickup truck as Database search mode for part of SRC's Silent Archer counter-UAS technology automated self-tasking

Maximum likelihood estimator (MLE) based direction finding algorithm

Fast frequency scanning using high-speed FPGA- based signal processing for coverage across multiple frequency bands

Wide receiver bandwidth for simultaneous direction finding on multiple signals

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