Static Accelerometer Orientation Tumble Calibration Procedures
Static tumble calibration calculates accelerometer bias, scale factor, and cross-axis matrices by optimizing spatial vector residuals against local gravity.
Over-Sampling Noise Floor
Quantization Dispersal
Spectral energy distribution governs the over-sampling noise floor within high-resolution analog to digital conversion architectures. This physical constraint defines the total broadband white noise power shifted into regions outside the primary signal band through the application of increased sampling rates. Digital filters remove this energy before the final data output, yet residual components exist at levels dictated by the converter bit depth and the specific decimation process implemented.
Operational Variance
Variations in clock stability influence how effectively the over-sampling noise floor maintains its theoretical distribution across the frequency domain. Jitter inside the master oscillator creates non-linear sidebands that push noise power back into the signal path. Proper grounding techniques mitigate these excursions by reducing the coupling of electromagnetic interference into the sensitive reference voltage pins.
Measurement Protocol
Test engineers quantify the over-sampling noise floor by injecting a pure sine wave into a converter and performing a fast fourier transform analysis on the resulting digital stream. Analysis focuses on the non-signal bins to calculate the power spectral density of the remaining artifacts. Precise calibration of the windowing function prevents spectral leakage from obscuring the true magnitude of the base noise level.
Systemic Limitation
Performance limits dictate that no amount of digital processing eliminates the over-sampling noise floor entirely due to the inherent thermal noise of the input circuitry and the quantization error of the initial sampling stage. Designers accept this value as a fixed performance ceiling for any specific architecture configuration. Resolution depth remains bound by the hardware capability rather than the sampling speed alone.