摘要: 目前大多数原子重力仪的装置复杂、体积庞大、环境适应性差，不能应用于野外进行绝对重力测量，这限制了原子重力仪的应用领域。本文利用自研的小型化原子重力仪，集成了一套车载绝对重力测量系统。该系统主要由原子重力仪、被动平台隔震系统、位姿平台调平系统、差分GPS测高系统、不间断电源供电系统及车载空调温控系统等组成。首先，本文对该测量系统的车载环境适应性进行了评估，发现在野外40摄氏度高温、8度大倾角普通路面的环境下，该系统仍然能够正常工作；其次，本文介绍了车载绝对重力测量的实验步骤及数据处理方法，并测量了车头朝向对绝对重力测量的影响。最后，在野外平坦路面上进行了重复测线工作，评估了系统的内符合绝对重力测量精度，结果约为30 μGal；在野外大倾角山体路面，通过测量不同海拔高度点的绝对重力值，得到了地球的垂直重力梯度值，约为-231(36) μGal/m。本文结果为野外绝对重力勘测提供了依据。
Research on the static measurement of the absolute gravity in a truck based on atomic gravimeter
- Received Date:
20 November 2019
Abstract: Currently, most of the experimental apparatuses of atomic gravimeters are complex in architecture, large in size, and poor in environmental adaptability, so that they could not be operated in field for the measurement of absolute gravity. Thus, the application areas of atomic gravimeters have been limited. In this paper, we have integrated a system of absolute gravity measurement on a truck based on a compact homemade atomic gravimeter. This system is consist of atomic gravimeter for gravity measurement, passive isolation platform for vibration suppression, the posture platform for tilt adjustment, differential GPS for altitude measurement, UPS for power supply, the air-conditioned truck for temperature control and transportation. At first, we have estimated the performance of environmental adaptability for this measurement system on the truck, and it is found that the system still can work even in a high field temperature of 40 centigrade and a big tilt angle of 8° for the road. Besides, the experimental procedure of absolute gravity measurement and the processing methods of the measured data have been introduced, and the dependence of measured gravity on the orientation of the truck has been measured and analyzed. Finally, repeated line measurements have been performed on a flat field road, and the accuracy of self-coincidence for absolute gravity measurement has been evaluated to be 30 μGal. Besides, we have obtained the vertical gravity gradient of the earth by measuring the absolute gravity values of different altitude sites on a slope road, and the value is estimated to be -231(36) μGal/m. The presented results could provide the basic reference for the field absolute gravity survey.