标题： 超低频校准的数字信号处理功能 显示英文标题

标题： Digital signal processing functions for ultra-low frequency calibrations

摘要： 工业界对能够以更低频率和更低噪声进行精确加速度测量的需求正在增加。 如今，在这一领域内使用了多种不同类型的振动换能器用于许多不同的目的，比如地震检测与预警、核试验监测以及环境监控。 为了这些目的使用的加速度计必须经过校准，以提供可靠的结果，并按照SI单位系统进行溯源。 为了实现这些校准，需要合适的超低噪声加速度计和/或信号处理功能。 在这里我们介绍两种专为校准系统中测量超低噪声加速度设计的数字信号处理（DSP）函数。 这些DSP函数通过分析来自两个测量相同信号的加速度计的双通道信号，并利用这两个信号之间的相干性来降低噪声。 模拟结果显示，这两种DSP函数比标准分析方法更好地估计了校准信号。 这里呈现的结果旨在用于加速度计校准系统的关键比较研究，并可能有助于将频率范围扩展到大约10毫赫兹的超低频段。 显示英文摘要

摘要： The demand from industry to produce accurate acceleration measurements down to ever lower frequencies and with ever lower noise is increasing. Different vibration transducers are used today for many different purposes within this area, like detection and warning for earthquakes, detection of nuclear testing, and monitoring of the environment. Accelerometers for such purposes must be calibrated in order to yield trustworthy results and provide traceability to the SI-system accordingly. For these calibrations to be feasible, suitable ultra low-noise accelerometers and/or signal processing functions are needed. Here we present two digital signal processing (DSP) functions designed to measure ultra low-noise acceleration in calibration systems. The DSP functions use dual channel signal analysis on signals from two accelerometers measuring the same signal and use the coherence between the two signals to reduce noise. Simulations show that the two DSP functions are estimating calibration signals better than the standard analysis. The results presented here are intended to be used in key comparison studies of accelerometer calibration systems, and may help extend frequency range down to ultra-low frequencies of around 10mHz.