DQI
Digital Quartz IMU (Inertial Measurement Unit)
Applications
Physical Characteristics
System Performance
Environmental

High-Performance, Low-Cost IMU Technology

The DQI, or Digital Quartz IMU (Inertial Measurement Unit), is a powerful component of BEI Systron Donner Inertial Division's technology solutions - offering "Six Degrees of Freedom" measurements for guidance, navigation and control applications.

The package includes solid-state quartz micromachined electromechanical system (MEMS) inertial sensors.  By combining batch fabrication with the stability of high-speed digital processing, DQI offers significantly improved IMU performance, adaptability to a wide variety of tactical vehicle and weapon applications at affordable cost.  Built on GyroChip® Technology.

 
Diverse applications
DQI provides state-of-the-art guidance, navigation and control for:
  • Tactical missiles
  • Precision guided munitions
  • Unmanned vehicles
  • Land vehicles
  • Avionic systems
  • Range instrumentation systems

Uniquely Digitized Mechanization
DQI technology is the first of its kind, featuring a dual tuning fork quartz rate sensor and a vibrating quartz accelerometer with a differential, double-ended tuning fork sensor configuration. Hermetically sealed in a laser-welded cube, this technology forms an inertial sensor assembly with digitized outputs, developed with unique electronics and signal-processing techniques. The digital mechanization greatly improves performance by reducing temperature sensitivity.

DQI Innovations at a Glance

  • All solid-state inertial measurement unit
  • Micromachined inertial sensors
  • Compact and lightweight
  • Durable design for high-vibration environment
  • Very low noise output
  • Delta Theta, Delta V output at 100 Hz
  • Linear acceleration; angular rates at 600 Hz
  • Easily interfaces with AMRAAM data protocol

Physical Characteristics
Size (Vol.) 43.2 in^3 (3.189"W x 3.53"D x 3.84"H) (81mm x 90mm x 98mm)
Weight 2.2 lbs. (1.0 kg)
Power 28 VDC at 17 watts
I/O AMRAAM serial data
Reliability @ 35°C 62,267 hr MTBF, ground; 12,791 hr MTBF, missile

System Performance
Gyro Accelerometer
Bias Repeatability 10 deg/hr (1 sigma) 1.5 mg (1 sigma)
In-Run Stability 3 deg/hr (1 sigma) 200 µg (1 sigma)
Scale Factor 350 ppm (1 sigma) 350 ppm (1 sigma)
Random Walk 0.035 deg/sqrt(hr) 60 µg/sqrt(hz)
Non-orthogonality 0.2 mrad (1 sigma) 0.2 mrad (1 sigma)

Environmental
Temperature Range -54° to +71°C (operating)
Vibration 12-19 grms (performance-endurance)
Shock (Survive) 150 g, 11 ms
Operating Range ±1000 deg/s*; ±70g **
*Angular Rate **Acceleration