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Introduction

The Feyman (FMI) IM19 attitude module combines MEMS sensor data with GNSS RTK positioning data to provide high-precision attitude measurements. This enables advanced features, like tilt-compensated surveying and robust navigation through brief GNSS outages.

  • Survey-Grade Accuracy: Delivers roll and pitch measurements accurate to within 0.05 degrees.
  • Tilt Compensation: No more perfectly vertical survey poles! The IM19 can calculate a virtual digital level point at any tilt angle, revolutionizing field data collection.
  • Sensor Fusion: Offers a continuous navigation solution (Dead Reckoning) even during brief GNSS signal loss, making it ideal for urban or obstructed environments.

When fed with NMEA GGA, GST, and RMC RTK corrected, GNSS messages at 5Hz, and a standard Pulse-Per-Second signal, the IM19 attitude module will output a proprietary NMEA ASCII GPFMI message which contains the compensated position of the tip of your surveying pole, plus the Roll, Pitch and Yaw of the IMU itself.

note

The IM19 needs to be fed with GNSS positioning data with a RTK Fixed solution (RTK Fix) in order to work correctly. This board will not work with non-RTK GNSS receivers.

Required Materials​

In this guide we'll cover how to setup the IM19 breakout board. To follow along with this tutorial, at a minimum, users will need the following items:

Sections​

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