Copyright © 2016  Grand Rapids Technologies, Inc.                      

Electronic Flight Instrumentation for Experimental Aircraft Since 1991

Adaptive AHRS / Air Data Computer/ Global Satellite Navigation System

Our New Attitude/Heading Reference System with Air Data and Satellite Navigation-all in one quick-mount package!

With more than 10 years experience producing AHRS, we were anxious to take advantage of the latest in MEMS technologies to update our design.  We started with a clean sheet, and built around the solid physics and mathematical algorithms that distinguished our AHRS with its ability to operate unaided.  The Adaptive AHRS is the result.  It is representative of the constant technological innovation here at GRT Avionics.  

Adaptive Attitude Means Redundancy. No longer limited to a single source of yaw reference, the Adaptive AHRS makes use of three sources of yaw stabilization data.  Built into every Adaptive AHRS is a miniature magnetometer, as well as algorithm and software enhancements, giving it the ability to use GPS ground track.  In addition, our AHRS has never required air data to function, and that remains true today.  What does this mean to you?

Adaptive Mounting. Mount the GADAHRS in any of 8 orientations - without regard to location relative to the aircraft center-line or center-of-gravity. Thirty degrees of roll, pitch and yaw adjustments eliminate the need for constructing a precise mount, or tedious shimming.  The AHRS accounts for its orientation with full accuracy.  Another GRT industry exclusive.

Auto-Leveling Quick Mount Digital Magnetometer.  Mount the magnetometer however it is convenient,and it will measure its own orientation.  No brackets or adjustments are required.  It couldn’t be easier.  Want more?  One magnetometer can now be used with multiple AHRS and even shared with the Mini-X or Mini-AP!

Ultra-Stable, High Accuracy Air Data Sensors.  IFR certifiable altimeter data is complemented with an airspeed sensor so precise that we show airspeed as low as 20 knots.  This makes the adaptive AHRS ideal for helicopter and STOL aircraft, and provides confidence in your approach speed with its maximum error of only 0.7 knots at a 70 knot approach speed.  

More Than Just GPS, it’s GSNS.  The optional global satellite navigation system (GSNS) is a quick-start satellite navigation receiver that can simultaneously acquire and track multiple satellite constellations, including the United States GPS system (with WAAS), Europe’s GALILEO, Russia’s GLONASS and Japan’s QZSS.  This provides greater integrity and availability of an accurate navigation position, even under adverse reception conditions.  The data is provided on a dedicated serial output in standard NMEA0183 format so it may be shared with other systems, such as an ELT, etc.  Since the GPS/GSNS is already mounted within the AHRS, there is nothing more to do except plug in the antenna!

Block Diagram of the Adaptive AHRS. The AHRS ability to provide attitude data without air data or GPS aiding,  or even a magnetometer, eliminates the need for dual air data sensors  and redundant magnetometers.  Independent power supplies and support circuitry are used so that no single failure would compromise both AHRS.