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Inertial Explorer® (IE) maximizes the performance of your GNSS/INS hardware by ensuring you get the position, velocity and attitude accuracy your application requires. The tightly coupled integration of GNSS and IMU data delivers precise results, even when lower grade inertial sensors are used. IE can produce results suitable for demanding applications such as mobile mapping, aerial and hydrographic surveying. IMU data from high end Fibre Optic Gyro (FOG) or Ring Laser Gyro (RLG) IMUs, and from lower grade sensor technology such as Micro Electrical Mechanical Systems (MEMS) can be processed.

Flexible Workflow Capabilities

IE has workflows to match your business and your expertise. A project wizard is available to allow new GNSS/INS users to become productive quickly. For more experienced users, a wealth of processing configuration options are available. Automated processing environment detection (aerial, ground vehicle, and marine) allows appropriate GNSS + INS processing settings to be used automatically to simplify workflow and reduce the learning curve needed to start producing quality results.


  • Loosely and tightly coupled GNSS/INS processing
  • Boresight module for solving angular offsets between IMU and camera frames
  • NovAtel’s AdVance® RTK


  • Easy integration with our SPAN® GNSS/INS products
  • Streamlined Project Wizard for quick startup
  • Single step GNSS and Inertial Measurement Unit (IMU) processing for efficient workflow
  • Built-in processing profiles for airborne, ground and marine projects
  • Support for multiple base stations
  • Precise Point Positioning (PPP) processing


Inertial Explorer integrates rate data from six degrees of freedom Inertial Measurement Unit (IMU) sensor arrays with GPS information. It is designed to utilize strapdown accelerometer (Dn) and angular rate (Dq) information to produce high rate coordinate and attitude information from a variety of IMUs, including high accuracy navigation grade to Micro Electro-Mechanical Systems (MEMS) sensor types.

Powerful Post-Processing

Inertial Explorer runs within our familiar Waypoint GrafNav processing environment and data analysis is performed with the same plotting tools. This provides it with all of the same features available in our GrafNav. Inertial Explorer brings GNSS and IMU data together in two different ways:

  • In loosely coupled mode, processing of the GPS data must first be processed in order to store optimal position, velocity and quality information in the standard GrafNav fwd/rev/cmb files. The IMU component of Inertial Explorer can then perform alignment, mechanization of measurements and filtering
  • In tightly coupled mode, the GNSS and IMU data are processed simultaneously. Benefits of this include the application of phase updates, which limits inertial error growth when even two GPS satellites are available and automatic ZUPT detection. Tightly coupled processing is suggested for poor signal tracking environments such as ground vehicle survey in urban environments.It is the user’s responsibility to time tag each set of inertial measurements to the GPS time frame during the data collection process. NovAtel’s SPAN® technology offers this.

Download Brochure: WaypointBrochure

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