Bias Instability Figures That Decide Whether Dead Reckoning Holds
Inertial dead reckoning holds only while gyroscope bias instability bounds cubic tilt divergence within allowable spatial position tolerance thresholds.
G Sensitivity Compensation
Correction Technique
Active or passive correction technique used to minimize the measurement errors in sensors caused by linear acceleration or gravitational forces. Precise oscillators and inertial sensors require g sensitivity compensation to maintain their frequency stability or orientation accuracy when the device moves. It targets the mechanical deformation of internal sensing elements that occurs under the weight of the component itself.
Structural Rigidity
Internal quartz crystals or silicon membranes flex slightly when subjected to external g loads. This physical shift in g sensitivity compensation alters the electrical properties of the device and introduces a predictable bias. Mounting the sensing element in a balanced configuration or using symmetric designs can cancel out some of these effects at the hardware level.
Algorithmic Correction
Electronic systems often use an auxiliary accelerometer to measure the real time orientation and motion of the primary sensor. Data from this accelerometer allows for g sensitivity compensation by subtracting the calculated error from the raw signal. Calibration involves rotating the device through known angles in the earth gravity field to determine the sensitivity coefficients for each axis.
This process is verified by comparing the compensated output against a reference standard in a controlled vibration environment.
Environmental Drift
Changes in temperature can modify the stiffness of the sensor housing and affect the magnitude of the acceleration error. Sustained g sensitivity compensation requires the system to account for these thermal variations over the entire operating life of the instrument. High performance navigation systems rely on this stability to prevent the accumulation of position errors during maneuvers.