North Finding Application Note

The INL-CVG-GU200 is a two-axis gyro Unit, CVG based (Coriolis Vibratory Gyros), currently in full series production in Dublin for the stabilisation con-trol market.

However, given the short-term bias stability observed on some samples under Lab conditions, the INNALABS’ CVG core technology could also be a pertinent candidate for the True North-Finder (TNF) market.
In order to clarify that point, the following test protocol has been carried out on 3 serial products:

  • Serial numbers (GU200): SN 126, 179, 180
  • Test equipment: Actidyn-Climats with temperature set-point of 25 °C ± 0.5 °C
  • Gyro Unit ON over 1 hr. Followed by a Gyro Unit OFF over 5 min. Followed by a Gyro Unit power on. Data-collection engaged at that point. Set-up: analogue low-pass filter (0.2 Hz) applied on GU outputs X and Y. Sampling period of 2.5 sec.
  • END for data-collection 8 hr later

Based on the data collected and by considering TNF operated through the carouseling method, the second part of this document provides an estima-tion of the gyro bias errors.

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