AHRS

OVERVIEW

Attitude and Heading Reference System (AHRS) relies on the combination of GPS differential carrier-phase signals and inertial rates that are standard within the AIMMS product line. Three AIMMS modules comprise the AHRS: the dual-processor GPS module, the IMU module and the Central Processing Module (CPM), where the CPM is loaded with AHRS-specific firmware. By fusing the absolute precision of GPS carrier-phase analysis with the responsiveness of inertial sensors, the AHRS is well suited for dynamic platforms where robustness of the solution is paramount in an environment with highly variable GPS signal quality.

SPECS

Electrical

Operating Voltage: 12.5 - 37 VDC Input

Max. Operating Current: 900 mA @ 12.5 VDC

Digital Interfaces: Controller Area Network (CAN2A), 500 kbps

 RS-232 Serial Ports (default 19.2 kbps)

Physical

Weights:

Inertial Measurement Unit (IMU): 0.74 kg (1.63 lb)

GPS Module (GPS): 0.80 kg (1.76 lb)

Central Processing Module: 0.60 kg (1.32 lb)

Environmental

Operating Temperature: -20 C to 50 C

 -40 C to 50 C (available under special order)

Storage Temperature: -40 C to 90 C

Load and Vibration Monitor (LVM)

Three-Axis (X,Y,Z) Acceleration:

Range:+/- 7 g

Accuracy: 0.005 g

Internal Sampling Rate: 200 Hz

Digital Low Pass Frequency Range: 1 Hz - 40 Hz

Maximum Data Output Rate: 40 Hz

FIRMWARE

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Comparison Table

  AIMMS-20 AIMMS-20 AIMMS-20 PMS PMS Canister AIMMS-30 AIMMS-30 ARIM200 ARIM200 ARIM310 ARIM 310 ARIM320 ARIM 320
Pitot-Static Yes Yes Yes Yes Yes Yes
AOA & AOS Yes Yes Yes Yes Yes Yes
Static Yes Yes Yes Yes Yes Yes
Temperature Yes Yes Yes Yes Yes Yes
Humidity Yes Yes Yes Yes Yes Yes
Wind Data* Yes Yes Yes no no Yes
Acceleration Yes Yes Yes Yes no Yes
Attitude Yes Yes Yes no no Yes
Anti-ice Heater Optional 150W Optional 350W no 250W 200W 200W
Environmental Heater 50W 200W no no 50W 50W
Pneumatic Purge no Yes no no no no
Interface CAN
RS-232
RS-485		 CAN
RS-232
RS-485		 CAN
RS-232
RS-485		 CAN
RS-232
RS-485		 CAN
RS-232
RS-485		 CAN
RS-232
RS-485
Optional Touch Display Yes Yes Yes no no no
GPS Yes Yes Yes no no Yes
USB Optional add-on Optional add-on Built-in Optional add-on Optional add-on Optional add-on
Dimensions 1.5" dia. boom
24" long
9" long pylon		 1.5" dia. boom
45" long		 0.75" dia. boom
13" long
4.5" long pylon		 1.5" dia. boom
24" long		 0.75" dia. boom
4 x 4.5 x 2.25 in. enclosure		 0.75" dia. boom
4 x 4.5 x 2.25 in. enclosure
Weight 3.2kg 5.5-6.5kg 1.08kg 1.9kg 0.75kg 0.845kg
Surface Finish Gold anodized/
TiN opt.		 TiN coated & black anodized Gold anodized/
TiN opt.		 TiN coated/
Anodizing opt.		 TiN coated & black anodized TiN coated & black anodized
Mil-Standard no no no Yes Yes Yes
Availability In production In production Available in March, 2014 In production In production In production

PS: Pitot-Static   |   AOA: Angle of Attack   |   AOS: Angle of Sideslip
* Wind data includes wind speed, wind direction, and vertical wind

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