GPS Health Monitor


The Northstar GPS Health Monitor adds unparalleled situational awareness and threat detection capabilities to any installation that depends on GPS for position or time. UHU’s patented algorithms validate the GPS satellite constellation using spatial processing techniques that cannot be spoofed. If a spoofer or jammer is detected, an alarm can be sent (via email, SMS, SNMP, etc.) to alert you of the attack and provide the angle of arrival (line of bearing) to the threat. Multiple Northstar's can be used to geolocate the threat. The Northstar can augment existing GPS receivers by validating that the environment is clear. The Northstar is a 19" rackmount 1U chassis.
A front view of the UHU Northstar
The Northstar is specifically designed to protect civil infrastructure, such as banking, airports and maritime ports, cellular installations, power grid substations, and more. The Northstar detects both spoofing and jamming attacks in seconds, immediately alerting users via the network and switching nearby GPS timing receivers into holdover.

Key Benefits:

• Simultaneously detects spoofers and jammers
• Impervious to spoofing
• Calculates angle of arrival (AOA) to each received threat
• Cutting-edge visualization tool
• Alerts/alarms sent via industry standard protocols (SNMP, SMPT, UDP, etc.)
• Management provided via secure web based interface
• RF disconnect optionally available for third party GPS receivers
• Event-based I/Q recorder optionally available
• GPS disciplined 10 MHz and 1 PPS outputs optionally available
     - Automatic timing holdover if spoofing or jamming is detected
     - Higher accuracy (ovenized quartz, atomic) oscillator options available
Simplified block diagram of the Northstar

Web-based User Interface

A screenshot from the Northstar's GUI
The Northstar is equipped with a web-based graphical user interface (GUI) and includes a constellation view, map view, and spectral view for real-time monitoring of your GPS environment. If a spoofer or jammer is present, the angle of arrival (or line of bearing) of each threat is prominently displayed. Additionally, a built-in "time machine" mode allows past interference to be displayed and analyzed as if in real-time.

Package Contents

Northstar (1U rackmount unit) •
Network Cable (RJ-45) •
AC Power Cable (IEC 60320 C13) •
User’s Guide •
A front view of the UHU NorthstarA back view of the UHU Northstar

Antenna Kit

4-element GPS Array •
Array mounting kit •
Four 100' Coaxial RF Cables •
A picture of the Northstar GPS antenna/array

Field Tested

A picture showing two real-world Northstar's locating a jammer.
The Northstar has been tested at six different government sanctioned spoofing/jamming events and deployed to numerous real-world hotspots (i.e. in the image shown, the driver is using a personal privacy jammer, potentially affecting nearby operations) over the last four years. The Northstar has repeatedly proven itself as the ultimate tool for detecting and locating GPS spoofing and jamming.

Lab Tested

In addition to field testing, the Northstar has been extensively tested using RF wavefront simulation.
Self Calibrating Icon

Is your GPS spoof-proof?