Inertial Sensor Modules

Q - What angular rate and acceleration output ranges are available?
A - Rate ranges are ±300°, ±150°, ±75°, ±45° and ±22.5°/sec and ±1 or ±2g acceleration (set at factory).

Q - Can I change rate and acceleration gains?
A - Yes, however the user would need to replace 12 resistors, documented in user manual.

Q - What output can I expect from the analog IMU's?.
A - Analog IMU's provide buffered signals 0-5V (nom.) with centers at 2.5V (nom). Details are available in the user manuals.

Q - What is the data format of the digital IMU?.
A - Two output formats are available. An NMEA like ASCII string with seven fields, representing X, Y and Z angular rate; X, Y and Z acceleration and temperature all in 10 bit resolution (0-1023). A 14 byte binary format is also available, both formats are user selectable. Additional details available in the user manual.

Q - Why do I need the anti-aliasing filters provided on the Gyrocube 3F?
A - The Gyrocube 3F is configured such that the sensor outputs bandwidth are beyond 100Hz with the anti-aliasing filters set for standard corner frequency of 37Hz. This assures flat response in the passband with a sharp roll-off and a -53dB stopband attenuation. Customers can order corner frequencies down to 1Hz. This can be particularly useful in attenuating unwanted mechanical effects in vehicles

Q - How much does an IMU weigh?
A - The Gyrocube 3A weighs 20grams.

Q - Are there special concerns for the IMU power source?
A - As with all analog circuits, care should be exercised to minimize the introduction of electrical noise into any desired signal. Some common power supply practices are outlined in the user manuals.


Q - What does 'integrated autopilot' mean?
A - We consider an integrated autopilot a complete solution to stabilize, control and navigate an autonomous vehicle. Our integrated autopilots are complete with static and dynamic pressure sensors, GPS receiver and triaxial IMU.

Q - Is an autopilot only useable on aircraft?
A - No, we have successfully tested these autopilots on autonomous aircraft, boat and car platforms. See our gallery.

Q - What else do I need to fly an aircraft with the PhoenixAX?
A - At minimum you need a vehicle, an appropriately sized battery, pitot-static plumbing, servos for the control surfaces on your airframe and a PhoenixAX autopilot. You can add optional sensors, such as sonar altimeter, magnetometer compass or telemetry link.

Q - Is software included with the PhoenixAX?.
A - Not currently. An optional software package will shortly be available. The PhoenixAX is a hardware platform for developing autopilot software. O-Navi supports the Autopilot Open Source Initiative to aid software developers and advance the state of the art of autopilot and autonomous vehicle control systems.

Q - Can I connect the VCC directly to a unregulated power source.
A - Yes, the PhoenixAX can be powered by 10-24V unregulated. It is highly recommended that users add noise filters to prevent RF and noise from other systems aboard your vehicle from interfering with the autopilot.

If you have a question not addressed here, please feel free to contact us.

For more information go to our SUPPORT page.

Autopilot / Flight Controller Modules
Inertial measurement units can be used as a sensor in a variety of applications from measuring tilt on RV's to space vehicle guidance and control. IMU's can be used to start backup generators during seismic events, automotive navigation when GPS is unavailable such as in tunnels, monitoring packages during shipment, indoor navigation, autonomously guided vehicles, industrial motion control, over-limit sensing in motion systems, failsafe detection in robotics, tilt angle for auto-leveling RV's, tracking satellite TV antennas on vehicles, controlling flying vehicles, smart pedometers, structural sway in high rise buildings or vibration measurement on bridges, drilling rigs, smart munitions, advanced robotics,