The relative monitoring gravimeter gPhoneX #108 was installed in the building of Faculty of Civil Engineering of the Slovak University of Technology in Bratislava in the beginning of 2016. Main purpose of the paper is to analyze how external environmental phenomena generating non-gravitational signal, such as strong human activity, ambient noise and tilting of observing site due to solar radiation, can influence the quality of relative gravity measurements and their suitability for geodynamic applications. For this purpose, we accomplished spectral analysis of gravity data with different sampling rate, examination of instrumental drift, and tidal analysis of hourly gravity records. Our study showed that the gPhoneX #108 gravity measurements are adversely affected by the tilting of the building, where the gravimeter is located. This effect produces a significant non gravitational signal with characteristic daily and seasonal variation depending on the weather conditions. The instability of the observing site also generates a strong non-gravitational signal and corrupts the estimation of tidal parameters mainly in a diurnal tidal band. The investigation of the instrumental drift proved its irregular character due to the changes of temperature in the operating room. Another limitation factor for detection of small gravity changes is the level of ambient noise with the average daily amplitude of about 100 nm s⁻². Obtained experimental results can be useful for planning and performing the relative gravity measurements in a noisy environment, or in the case of an instable observing site. The most significant non-gravitational signal with variable daily and seasonal influence was caused by the instability of the observing site. In order to minimize this influence we recommend regular calibration of the built-in tiltmeters.

相对监测重力仪gPhoneX＃108于2016年初安装在斯洛伐克工业大学布拉迪斯拉发的土木工程学院大楼内。本文的主要目的是分析外部环境现象如何产生非重力信号，例如由于强烈的人类活动，环境噪声和太阳辐射所致观测站点的倾斜会影响相对重力测量的质量及其在地球动力学应用中的适用性。为此，我们完成了具有不同采样率的重力数据的频谱分析，仪器漂移检查以及每小时重力记录的潮汐分析。我们的研究表明，gPhoneX＃108的重力测量受到重力计所在建筑物的倾斜的不利影响。此效果会产生明显的非重力信号，并会根据天气状况而出现典型的每日和季节性变化。观测点的不稳定性还会产生强烈的非重力信号，并且主要在昼夜潮汐带中破坏潮汐参数的估计。由于手术室温度的变化，仪器漂移的研究证明了它的不规则特性。检测小重力变化的另一个限制因素是平均每日振幅约为100 nm s的环境噪声水平 观测点的不稳定性还会产生强烈的非重力信号，并且主要在昼夜潮汐带中破坏潮汐参数的估计。由于手术室温度的变化，仪器漂移的研究证明了它的不规则特性。检测小重力变化的另一个限制因素是平均每日振幅约为100 nm s的环境噪声水平 观测点的不稳定性还会产生强烈的非重力信号，并且主要在昼夜潮汐带中破坏潮汐参数的估计。由于手术室温度的变化，仪器漂移的研究证明了它的不规则特性。检测小重力变化的另一个限制因素是平均每日振幅约为100 nm s的环境噪声水平⁻²。获得的实验结果对于在嘈杂的环境中或在不稳定的观测站点的情况下计划和执行相对重力测量很有用。每日和季节影响可变的最重要的非重力信号是由观测点的不稳定性引起的。为了最大程度地减少这种影响，我们建议定期校准内置测斜仪。