Tactical grade MEMS gyroscopes (zero bias <1 °/hr) can achieve ± 0.5 °~1 ° north-seeking accuracy in static environments through multi position calibration (such as the 24-point method) and Kalman filtering, making them suitable for low-cost vehicle mounted/portable devices. However, in dynamic environments, the accuracy drops sharply, and long-term work requires auxiliary sensors (such as GNSS timing and Earth angular velocity synchronization).
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