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GPS/Inertial Products
Precision Georegistration and Remote Sensing System
A modular surveying and targeting platform

The GI-Eye system is a software platform that integrates GPS, inertial, and digital camera data. It is designed for collecting high-resolution imagery to be used for precise visual navigation or accurate geolocation of target coordinates. The GI-Eye takes advantage of differential or kinematic GPS positioning to provide the precise location of each camera image, and uses NAVSYS’ proprietary InterNav™ kinematic alignment algorithm to measure the precise attitude of the camera using the inertial sensor data. By recording the precise location and attitude of the video images, the extraction of feature location data is simplified and streamlined. This results in more efficient and rapid data processing—reducing the time required to generate high accuracy target or feature coordinates, and in some cases eliminating the need for expensive and time consuming tie-point processing. The high-resolution imagery provides mensurated target coordinates and near real-time composite mosaic imagery suitable for viewing on the observer's base station laptop. In addition, a precision digital elevation model can be extracted from the collected imagery.

The system can receive and process both range and carrier-phase differential corrections in real-time from Wide Area Differential GPS services or from a ground reference station using a standard RTCM serial interface. A wireless data link between the GPS/INS/Camera unit and the base station can be included in the GI-Eye system.

Embeds easily into existing or sourced sensors
Because the GI-Eye system is a software platform, it can be embedded to run on existing processor platforms and utilize data from existing GPS, inertial and visual sensors, reducing size and weight for your application. NAVSYS can also provide numerous sensors to meet the performance requirements of your application. Because of its modular design, it enables sensor upgrades over time with only software configuration changes.

Available for aerial, marine, and terrestrial applications
Applications of the GI-Eye system include generation of target coordinates from airborne or ground vehicles, autonomous georegistration of video (or other sensor) data for archival and to speed data processing, visual-aided navigation, mapping and feature geolocation, and GIS attribute data collection. Targeting systems have been developed for both commercial and government applications, including the National Geospatial-Intelligence Agency and Office of Naval Research.

The NAVSYS GI-Eye technology has been integrated into FLIR Systems’ Star SAFIRE airborne electro-optic imaging system. GI-Eye provides the geopointing capability within Star SAFIRE that allows the image to be stabilized on a particular coordinate. The improved stabilization allows the Star SAFIRE product to operate with extremely narrow fields of view as seen in this demonstration video.

The GI-Eye product line has also been used in stabilized thermal, low-light, and television imaging systems designed for surveillance and reconnaissance aboard airplanes, helicopters, and UAVs. The system is employed in varied environments and customer sets for this application.

GI-Eye targeting system developed for the National Geospatial-Intelligence Agency.
Click photo to view Star SAFIRE II Demo video
GI-Eye technology improves image stabilization in the FLIR Systems Star SAFIRE airborne electro-optic imaging system. Click the image above to watch a demonstration video.
GI-Eye has been used in stabilized thermal, low-light, and television imaging systems designed for surveillance and reconnaissance aboard UAVs and other aircraft.


GI-Eye System Characteristics
Time accuracy: 250 nanoseconds (1-PPS output)
Position accuracy  
    RTK GPS:
    SPS (no DGPS):
0.01 meter CEP
1.0 meter CEP
10 meter CEP
Azimuth accuracy: 1 mrad (1-sigma)*
Pitch/Roll accuracy: 300 µrad (1-sigma)*
1000 meters per second
4g (sustained tracking)
Host computer: ADL855 PC104 SBC
Internal interface cards: GPS, DGPS, IMU serial interfaces, USB
Storage capacity: >80 Gbyte Hard Drive
* Dependent on camera motion when data is taken.

GI-Eye Interfaces
Operator console: Windows XP GUI. Real-time navigation and imagery data display
1-pps: Precise time sync output
Digital image data files  
    Peak data rate:
    Data format:
1 frame/3 seconds (programmable log rate)
TIFF file format (3056x2032 pixels)
Georeference data files:
Time, position & attitude data for each image (ASCII format)
Post-Test analysis data files:
GPS & IMU raw data for post-processing with DGPS

GRIM Software
  • Viewer for GI-Eye image data with built-in image enhancement
  • Displays GI-Eye location in map format with image view overlaid on the projection
  • GI-Locate algorithm for point-and-click computation of object locations from selected pixel coordinates

GI-Locate Performance*

Relative location accuracy:
0.1-0.3 m (range to target<100 m)**
1-3 m (range to target<1000 m)**
Absolute location accuracy:
< 1 m (range to target<1000 m with DGPS option)**
Data export:
Access database file format
Access report generation for GIS data interfaces
Requires: PC with Windows XP
* Dependent on camera motion when data is taken.
** Object of interest must be large enough to be distinguished to one-pixel from image data.
Inertial Measurement Unit
Gyros: 1-10 deg/hour
Accelerometer: 200 :g

Digital Camera
Camera: High res 10 bit color
  Pixels: 1280 x 1024
  Digital data interface: Standard USB 2.0 digital signal output
  Lens: Specify desired field-of-view when ordering system

Alternate camera configurations available
Precision mounting baseplate:  
  Camera/IMU   alignment: < 500 mrad (with calibration)

GPS Receiver Characteristics
Acquisition Time  
  Time to First Fix: 50 sec cold start
40 sec warm start

Differential GPS

Real-time DGPS receiver (Standard)
Direct broadcast from geostationary satellite transponder

Wide area differential GPS service precise positioning throughout the continental U.S. and much of Canada and Mexico

Nominal accuracy is 1 to 3 meters (1 sigma horizontal)

Post-test DGPS Reference Station (option)
  • OEM4 Performance Series Receiver
  • RTCM 104 Release 2.0 differential GPS output
  • Correction accuracy: 0.1 meter

Power: 9 to 18 V dc 50 watts max
Operational temperature:
+10°C to +45°C
Storage temperature: -25°C to +60°C
Shock: 4.2 G
Vibration: 1.5 G
Approx. dimensions: 12 in. H x 12 in. D x 8 in. W
Weight: 25 lb
System customization:
Call for details on our customization services to facilitate GI-Eye integration and operation for your application
Calibration services:
Available for custom camera installation and alignment

GI-Eye Related Info

Related Products

InterNav GPS/Inertial Integration Software. The GI-Eye product uses NAVSYS’ modular integrated GPS/inertial software product, InterNav, to produce the precision integrated GPS/inertial solution. This product is also available for customized embedded integrated GPS/inertial and video applications.

Downloadable Papers


Real-Time Target Geo-Location and Web-Based Situational Awareness Using Tactical UAVs.
UAS Payloads Conference, San Diego, CA, Nov. 2008 (PDF: 7.7MB)


Web-based Geo-Referenced Image Manager (WebGRIM): Automated correction, processing and management of aerial data.
Proceedings of PCI Geomatics Tower Club Applications Seminar, Vienna, VA, Oct. 2007 (PDF: 5MB)


Flight Test Results of a Video-Aided GPS_Inertial Navigation System.
Proceedings of ION GNSS 2007, Ft. Worth, TX, Sept. 2007 (PDF: 275k)


Near Real-Time Dissemination of Geo-Referenced Imagery by an Enterprise Server.
Proceedings of 2006 GeoTec, Ottawa, Ontario, Canada, June 2006 (PDF: 1.6MB)


Precision Maritime Inshore Navigation with a Tightly-Coupled Sensor System.
Proceedings of ION GNSS 2004, Long Beach, CA, Sept. 2004 (PDF: 371 KB)


Performance Test Results on an Integrated GPS/MEMS Inertial Navigation Package.
Proceedings of ION GNSS 2004, Long Beach, CA, Sept. 2004 (PDF: 305 KB)


Precision Kinematic Alignment Using a Low-Cost GPS/INS System.
Proceedings of ION GPS 2002, Portland, Sept. 2002 (PDF: 307 KB)


Video Updates during GPS Dropouts using Navigation and Electro/Optic Sensor Integration Technology.
Proceedings of the 58th Annual ION Meeting, Albuquerque, NM, 24-26 June 2002 (PDF: 314 KB)


Inertial Navigation Electro-Optical Aiding During GPS Dropouts.
Proceedings of the Joint Navigation Conference 2002, Orlando, FL, May 2002 (PDF: 444 KB)


High Accuracy Autonomous Image Georeferencing Using a GPS/Inertial-Aided Digital Imaging System.
Proceedings of ION National Technical Meeting 2002, San Diego, CA, Jan. 2002 (PDF: 907 KB)


Precision Targeting Using GPS/Inertial-Aided Sensors.
ION 55th Annual Meeting, Cambridge, MA, June 1999 (PDF: 613 KB)

Downloadable Brochure

GI-Eye Precision Georegistration and Targeting System (PDF: 232 KB)


Debbie Westra
toll free: 866.4.NAVSYS (866.462.8797)
or 719.481.4289

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