The Athena 611 from Rockwell Collins is a fully integrated inertial navigation system (INS), global positioning system (GPS), and an air data, attitude and heading reference system (ADAHRS). The unit incorporates a navigation grade IMU and an embedded pressure altimeter; the data from these sensors is used in the INS/GPS Kalman filter solution. The Athena 611 also gives you an option to accept external static pressure data. It houses a central processing unit (CPU), air data transducers, an embedded C/A GPS receiver and peripheral input/outputs to function as a complete ADAHRS.

The Athena 611 system consists of two cable-connected units: the inertial measurement unit (IMU) and the Navigation and Communications Unit (NCU). The IMU used is the Honeywell HG9900.

Key Features & Benefits
*Assesses accurate roll, pitch and heading in dynamic maneuvers and sustained turns
*Provides full air data measurements including AoA and sideslip
*Tolerant to GPS outage
*Offers optional software module that gives you Rockwell Collins? full suite of advanced and flight-proven functions, including autopilot, guidance, navigation and mission management.

Specifications

Performance
INS/GPS Performance:
Update Rate: 100 Hz, can be configured to 50 or 300 Hz
Start-up Time: 14 seconds (initial attitude); 4 minutes gyro compassed attitude/position
Heading Range: ? 3.14 rad (? 180 deg)
Attitude Range Pitch :? 1.57 rad (? 90 deg)
Attitude Range Roll: ? 3.14 rad (? 180 deg)
Altitude Range: -304.8 to 15,240 m (-1,000 ft to 50,000 ft) standard; other custom ranges are available
Baro-inertial Altitude Accuracy : 13.7 m (45 ft) at sea level, 91.4 m (300 ft) at 15,240 m (50,000 ft) altitude
WGS 84 Referenced Altitude Accuracy : GPS receiver accuracy
GPS Range: Worldwide
Lat/Long Position/Velocity Accuracy: GPS receiver accuracy
GPS Antenna Power: 5 V
Airspeed Accuracy: < 2 knots @ 40 knots, < 1 knot @ 60 knots
Max Airspeed: 200 knots standard, can be configured to other speeds
Angle of Attack Range: ? 0.139 rad (? 8 deg) at max airspeed
Angle of Sideslip Range: ? 0.139 rad (? 8 deg) at max airspeed

Input/Output:
Outside Air Temperature: Input
Program and Maintenance Serial Port: (1) PPP service port (RS-232)
Serial Ports: (1) INS port (RS-422) baud: 230.4 kb/s; (3) Spare (RS-422)
Discrete Inputs: (2)
Discrete Outputs: (2)

IMU Performance:
Rate Gyro Bias: 0.003 deg/h, 1s
Maximum Angular Rates: ? 400 deg/s

Physical Specs
Size - without mounting bracket: < 15.5 x 10.1 x 17.3 cm (< 6.1 x 4.0 x 6.8 in)
Weight: NCU: 1.5 kg (3.2 lb); Cable: 0.158 kg (0.35 lb); IMU: 2.8 kg (6.1 lb)
Enclosure: Aluminum
Power: 18.5 W nominal @ 18-36 VDC

Power
The input power is 18-36 VDC
The power consumption is 18.5 W nominal

Environmental
Operating Temperature: -40 to 70 deg C
Operating Vibration: MIL-STD-810F
Humidity: MIL-STD-810F