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Archangel Systems Inc. announced today it has received FAA TSO-C4c & C6e approval to manufacture its AHR50 Attitude Heading Reference System (AHRS).  Despite extreme size and weight budgets of only 2.5” x 2.0” x 1.4” & 75 grams, the AHR50 core software is certified to DO178B Level A—identical to the certification level in our flagship AHR150A (ADAHRS).  According to Dr. Michael Greene, CEO of Archangel Systems, “the AHR50 is the most compact Level A AHRS in the marketplace.” 

The AHR50 can operate as a standalone Inertial Measurement Unit (IMU) providing body and inertial angles & rates with a maximum gyro rate of + 150°/s & an altitude ceiling of 52,000 feet.  When connected to Archangel’s AHR150A-2-A Magnetic Sensing Unit (MSU), the AHR50 becomes a complete AHRS with both attitude & heading output data.  Information on the AHR150A-2-A is available at www.archangel.com.

 The AHR50 complete package

The AHR50 was designed for two missions.  The first is for embedded applications where the host system provides EMI / EMC & input voltage protection.  With Level A software & DO-160E certifications for remaining categories, the AHR50 is ideal for primary flight system designs.  Second, impending FAA equipment requirements for UAS platforms operating in the domestic airspace will require some level of software certification.  Since both the AHR50 & the AHR150A-2 MSU carry Level A certifications, the combined system meets all possible scenarios. 

All customer data interfaces are via a single RS232 port with input & output data defined in the AHR50 ICD (User must confirm this is latest Rev. prior to use).  The input port has two functions.  First, during setup, commands for in-field magnetic compass calibration, orientation (8 options) & lever arm corrections are defined.  Second, during operation, directional gyro (DG mode) heading select & compass slewing are received through the RS232 port.   In addition, the ICD supports an air data message input.  If received, the AHR50 blending algorithms can achieve FOG-equivalent attitude performance & echo the air data to downstream systems. Software customizations for other sensor inputs can be developed by Archangel.

For further information on Archangel’s products, contact Bill Dillard at (334) 826-8008 x14 or via our website

Archangel Systems, Inc. is a private, closely held Alabama Corporation, headquartered in Auburn, Alabama. Formed in 1992, the company specializes in Inertial Sensing Systems & Solutions for Aerospace, Automotive, & Military applications. Areas of expertise include inertial sensor research, hardware & software development, as well as FAA certification of both hardware & software to any DAL criticality level. For additional information, please visit www.archangel.com.

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aerosonic oasis standby instrument

Aerosonic's OASIS Standby Instrument

Aerosonic Corp. Executive V.P., Mark Perkins, announced today that Archangel Systems’ AHR50 AHRS has been selected for the OASIS standby instrument system. “We saw opportunity in the standby market and had all of the technology in-house except the AHRS. Archangel and its AHR50 are a good match for us. They have both the product and the expertise to work at the systems level with our engineers. We expect to have TSO approvals in place during Q2, 2013.”

The AHR50 is designed as an embeddable AHRS in that a portion of the DO-160E categories are certified with the customer providing EMI / EMC and power input protection. Software is certified to DO-178B Level A. If needed, Archangel can also provide support for the customer’s TSO submission package.  

Archangel Systems'
AHR50 AHRS

From Michael Greene, Archangel’s CEO, “Aerosonic’s standby strategy is precisely why we developed the AHR50. It makes short work of the customer’s AHRS development and certification efforts. They’ve done a beautiful job with the product and should capture a strong market share.”

For further information on Archangel’s products, contact Bill Dillard at (334) 826-8008 x14 or via our website

Archangel Systems, Inc. is a private, closely held Alabama Corporation, headquartered in Auburn, Alabama. Formed in 1992, the company specializes in Inertial Sensing Systems & Solutions for Aerospace, Automotive, & Military applications. Areas of expertise include inertial sensor research, hardware & software development, as well as FAA certification of both hardware & software to any DAL criticality level. For additional information, please visit www.archangel.com.

Published in News