绝对重力仪双采样过零检测中量化噪声的影响分析

Quantizing Noise Impact Analysis of the Two-Sample Zero-Crossing Method in the Free Fall Absolute Gravimeter

利用高速采集系统完整记录绝对重力仪棱镜自由下落的干涉条纹波形,能够获取更多的重力信息。详细讨论了干涉条纹电压信号幅值与ADC相关参数,如等效位数、参考电压、采样频率等对重力测量的影响。结果表明,通过参数优化设计可以将ADC量化的影响限制在0.01μGal。

High speed ADC is employed in the free fall absolute gravimeter to record the integral fringe waveform, acquiring more information about local gravity. We discuss variations in gravity accelera- tion due to some parameters such as amplitude of the fringe voltage signal, ADC bits, reference volt- age, and sampling frequency. The analysis shows that the gravity error caused by ADC quantization could be limited to 0.01 μGal by parameters optimization.