In Strapdown Inertial Navigation Systems, accelerometers are the primary tool for measuring both gravitational and inertial accelerations and providing the host vehicle with Guidance and Flight-Control parameters in a self- contained manner. Ultimately, the success of the mission highly depends on how well the Strapdown system performs and this is to a large extent determined by the performance capabilities of the accelerometers.


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Parameters Units Values
Input Range (10 Ω load resistor) g ±80
Bias mg ≤4
  One-year Composite Repeatability (3σ) μg ≤1,000
  Temperature Sensitivity μg/°C ≤50
Scale Factor mA/g ±0.65 to 0.85
  One-year Composite Repeatability (3σ) ppm ≤600
  Temperature Sensitivity ppm/°C ≤100
Axis Misalignment μrad ≤1,500
  One-year Composite Repeatability (3σ) μrad ≤100
Vibration Rectification μg/g2 RMS ≤25 (50-200 Hz)
≤50 (200-750 Hz)
≤100 (750-2000 Hz)
Intrinsic Noise (1kΩ load resistor) μg RMS ≤7 (0-10 Hz)
≤70 (10-500 Hz)
≤1,500 (500-10 kHz)
Operating Temperature °C -55 to +105
Shock half-sine (4 ms) g 250
Vibration peak sine (≤ 2 kHz) 35 peak 250
Resolution/Threshold μg ≤1
Bandwidth Hz ≥300
Thermal Modelling
Temperature Model Yes
Quiescent Current per Supply (0 g) mA ≤6
Quiescent Power @ ±15VDC (0 g) mW ≤180

Temperature sensor
Voltage Self-Test
Current Self-Test
Power / Signal Ground
Input Voltage VDC ±13 to ±18
Mass gm 25.8
Diameter below mounting surface mm ø 18.2
Height – bottom to mounting surface mm 11.2
Case Material 300 series Stainless Steel


In modern high-tech Unmanned Aerial Vehicles (UAV) and Precision Guided Systems, the requirements for smaller size, lower power consumption and lower cost have largely promoted and supported the development of MEMS inertial sensors. However, the performance of MEMS-based sensors still lags well behind that of more mature technologies, such as force-rebalance quartz pendulous accelerometers.

Recent technological advances in Control Systems are increasingly leading to more stringent mission profiles for these applications which may comprise, for example, high- dynamic manoeuvres in GPS denied environments and harsh vibration levels. The limited accuracy and precision afforded by MEMS-based platforms creates a gap in the market requiring low size and high performance at a competitive price point. The AI-Q-550 accelerometer from InnaLabs® bridges this gap.

The AI-Q-550 is the latest addition to InnaLabs® line of high quality, high performance, built in Europe, ITAR-Free sensors aimed at tactical, control, measurement and navigation markets.

The InnaLabs® AI-Q-550 offers industry-leading ±80g dynamic range in a 5cm3 form factor with extremely low vibration rectification errors. The AI-Q-550 is able to operate under the harshest of environments and offers exceptionally low output noise, and long-term stability with one-year composite repeatability errors of better than 1mg and 600ppm (bias and scale factor respectively).

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