MEMS-Based AHRS Inertial Sensors for UAS, UGVs, AUVs and Robotics

Sparton NavEx
Sparton NavEx inertial sensor systems

Sparton Navigation and Exploration is a leading developer of inertial sensor systems. Our MEMS-based inertial systems deliver heading, orientation, and position data with exceptional accuracy.

Sparton’s robust sensor technology is an ideal solution for dynamic and demanding applications, especially the harsh and often GPS-denied environments of UAS and autonomous vehicle operations. From surveillance and reconnaissance to positioning, stabilization and other military, industrial and commercial applications, our sensor systems can meet your most exacting requirements.

AHRS-M2 Attitude Heading Reference System

Micro AHRS/IMU for autonomous vehicles

AHRS-M2 Micro AHRS for UASThe AHRS-M2 is a fully temperature compensated, micro-sized, lightweight and low power Attitude Heading Reference System (AHRS). Featuring our proprietary AdaptNav sensor fusion algorithms, the AHRS-M2 learns on-the-fly to provide continuous, adaptive magnetic calibration without the need to perform a traditional complex 12-point calibration.

Incorporating on-board tri-axial magnetometers and MEMS accelerometers and gyroscopes in a very small form factor, the system is ideal for SWaP-C-conscious applications, such as sUAS. The AHRS-M2 delivers temperature compensation, lower heading drift, and superior performance even in the presence of platform vibration.

The AHRS-M2 also features Sparton’s NorthTek on-board programming environment, empowering users with virtually limitless product customization and integration flexibility.

Specifications:

Dynamic Heading Accuracy 1.0° RMS
Static Heading Accuracy 0.2° RMS (<1.0° RMS from -40° to +70° C)
Dynamic Pitch/Roll Accuracy 1.0° RMS
Static Pitch/Roll Accuracy 0.2° RMS
Accelerometer Range ± 4g (± 1g)
Accelerometer Noise Density 250 μg/√Hz
Update Rate 10 or 100 Hz
Dimensions (LxWxH) 38.4 x 22.9 x 9.1 mm (1.51 x 0.90 x 0.36 inches)
Weight 12.3g
Input Power, Operating Mode (Typical @ 4V) 60 mW
Input Power, Sleep Mode (Typical @ 4v) 16 mW

AHRS-8 Attitude Heading Reference System

Highly accurate 3-axis sensing technology

Sparton AHRS-8 for UASThe AHRS-8 is a fully temperature compensated AHRS, individually calibrated over an operating range of -40o to +70o C. It provides superior attitude and heading output accuracy in a broad range of challenging dynamic and magnetic environments.

The onboard state-of-the-art AdaptNav algorithms allow the AHRS-8 to deliver full 360° tilt compensation, even in the presence of transient magnetic interference. It incorporates the World Magnetic Model allowing it to provide a True North output at all locations around the globe.

Incorporating 3-axis magnetometers, accelerometers and gyroscopes, with selectable 4g or 8g accelerometer ranges, the AHRS-8 is ideal for autonomous systems operating in harsh environments. Applications include precision navigation and guidance, and platform stabilization and positioning.

Specifications:

Dynamic Heading Accuracy 1.0° RMS
Static Heading Accuracy 0.2° RMS (<1.0° RMS from -40° to +70° C)
Dynamic Pitch/Roll Accuracy 1.0° RMS
Static Pitch/Roll Accuracy 0.2° RMS
Accelerometer Range ± 4g or ± 8g (± 1g)
Accelerometer Noise Density 126 μg/√Hz
Update Rate 100 Hz
Dimensions (LxWxH) 42 x 28 x 12 mm (1.66 x 1.11 x 0.43 inches)
Weight 16g
Input Power, Operating Mode (Typical @ 4V) 330 mW
Input Power, Sleep Mode (Typical @ 4v) 16 mW

DC-4E Attitude Heading Reference System

Tilt compensated AHRS for UAS

Sparton DC-4E AHRS for UASThe DC-4E is an AHRS with six degrees of freedom (triaxial magnetometers and accelerometers) that provides full 360° tilt-compensated heading, pitch, and roll data. It features both 2D and 3D adaptive in-field calibration for superior magnetic interference compensation as well as a built-in World Magnetic Model for accurate True North measurement.

Its small size, low power consumption and power management functionality make it ideally suited to unmanned aerial vehicles (UAS, UAVs).

Specifications:

Static Heading Accuracy 0.3° RMS
Static Pitch/Roll Accuracy 0.2° RMS
Accelerometer Range ± 4g (± 1g) configurable to ± 8g
Accelerometer Noise Density 126 μg/√Hz
Update Rate 10 Hz
Dimensions (LxWxH) 42 x 28 x 12 mm (1.66 x 1.11 x 0.43 inches)
Weight 16g
Input Power, Operating Mode (Typical @ 4V) 132 mW
Input Power, Sleep Mode (Typical @ 4v) 14 mW

PHOD-1 Hydrophone for AUVs

Rugged omnidirectional hydrophone for AUVs

Rugged PHOD-1 Hydrophone for AUVsThe PHOD-1 is a rugged omnidirectional broadband hydrophone designed for high performance and real world durability in tough undersea conditions. Encased in a durable polyurethane jacket with molded-in strain relief, it can withstand mechanical shock, thermal shock, and hydrostatic pressure cycling without performance degradation. The integrated 10m underwater cable features two shielded twisted pair wires to reduce electrical noise, and is also water-blocked and Kevlar-reinforced.

Rugged PHOD-1 HydrophoneThe pre-amplified PHOD-1 hydrophone exhibits minimal change in response and directivity with temperature and hydrostatic pressure, and has equivalent self-noise figures below Sea State 0. Its low current draw makes it ideal for power-conscious applications such as autonomous underwater vehicles (AUVs, UUVs) and other subsea robotics systems.

Specifications:

Usable Frequency Range 10 Hz to 50 kHz
Resonance Frequency 46 kHz
Receive Sensitivity -156 dB re 1V/μPa
Horizontal Directivity Omni ± 1 dB to 40 kHz
Vertical Directivity Omni ± 1 dB to 20 kHz / Omni ± 3 dB to 40 kHz
Current Draw 10 mA
Preamplifier Gain 37 dB
Dimensions 1.25” OD x 4.65” Length
Max Operating Depth Tested to 300m

More Information: PHOD-1 Hydrophone

Downloads

Integrating Magnetometers into MEMS-Based Inertial Systems

This technical whitepaper discusses techniques to mitigate measurement distortion in inertial systems which include magnetometers. The paper details a number of product integration guidelines, and covers operational considerations and available on-board calibration procedures that will optimize the overall performance of an inertial system.

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