Andy Piper 1be84b6dde AP_InertialSensor: tier Invensensev3 gyro bias override by variant
The v3 driver covers eight chips with a wide spread in ZRO
temperature coefficient. ArduPilot's startup gyro cal removes the
static ZRO, so the EKF clamp must bound the in-flight drift driven
mostly by temperature swing times the temp coefficient.

  ICM-42688-P, ICM-45686:  0.005 deg/s/C -> ~0.3 deg/s over 60C
  ICM-40609-D:             0.01  deg/s/C
  ICM-42670-P:             0.015 deg/s/C
  ICM-42605, IIM-42652:    0.02  deg/s/C -> ~1.2 deg/s over 60C
  IIM-42653:               0.04  deg/s/C -> ~2.4 deg/s over 60C

Applying radians(2.0) across the whole family was too tight for
IIM-42653 and marginal for the mid-tier parts. Tier the override:
the two very-low-drift parts keep radians(2.0)/1.0 deg/s, the
mid-tier parts get radians(3.0)/1.5 deg/s, and ICM-40605 (no
datasheet checked) plus IIM-42653 fall back to the base default.

Datasheets consulted: DS-000347, DS-000489, DS-000292, DS-000330,
DS-000451, DS-000440, DS-000529.
2026-05-13 18:29:03 +10:00
2026-05-09 21:41:19 +10:00
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2026-05-13 18:29:03 +10:00
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