Inertial Labs has developed an accelerometer range suitable for uncrewed navigation systems and a high-accuracy IMU for GNSS-denied navigation (writes Nick Flaherty).

The self-contained, strap-down, three-axis accelerometers measure linear accelerations with a precision of 0.005 mg at a ±8g range. This comes from the design of the three-axis sensing to compensate for any drift and their experience in calibration.

The TAA-308, TAA-315 and TAA-340 models measure accelerations within ranges of ±8g, ±15g and ±40g, respectively, with continuous built-in test (BIT) and temperature compensation.

They are mathematically aligned to an orthogonal coordinate system, ensuring precision.

The TAA accelerometer series has a bias in-run stability as low as 0.005 mg at a ±8g dynamic range, characterised by minimal noise, as low as 0.015 m/sec/√hr for the velocity random walk (VRW) for the TAA-308, and high reliability, with a 500 ppm scale-factor repeatability over a year.

They measure 28.5 x 19.5 x 13.6 mm and weigh13 g, with a RS-422 data interface and discrete input/output (I/O) lines.

The accelerometer is combined with a gyroscope for the IMU-NAV-200 inertial navigation unit, which has a bias in-run stability of 0.3 o/hr and an angular random walk (ARW) of 0.04 o/√hr.

The tactical-grade IMU measures linear accelerations, angular rates, and pitch and roll with high accuracy for both motionless and dynamic applications.

The IMU-NAV-200 offers static pitch and roll with an accuracy of 0.03o, and a dynamic pitch and roll accuracy of 0.06o. It measures 47 x 62.6 x 43.5 mm and weighs 155 g, with a RS-232 or RS-422 output.

The IMU-NAV-200 was specifically designed for GNSS-denied guidance and navigation applications.