一、引言G-801G型海洋质子梯度仪具有对总磁场较高的分辨力、对日变的自动校正和对作为一个附加地球物理变量的梯度的测量,充分地改进了海洋磁测资料的质量和效果。质子梯度仪系统易于安装在一条地球物理船上,并与现有的地震和重力设备互相配合,进一步提高全面的调查能力。G-801G使用两台同步高灵敏度的G-801海洋质子磁力仪,以便从同一根电缆上按一定距离间隔一前一后的拖着两个传感器那里同时测量地球的总磁场。总磁场和梯度(两个传感器之间的差动测量)实时记录在双道模拟纸带记录器上。同时,每台磁力仪的总场可以数字记录(共12个BCD字符),以便有效地用计算机进行滤波、导航误差的校正以及求出消除时变的总磁场。在不能利用磁力仪基点站的地方,尤其在非常活动的磁场区,如磁极或磁赤道地带处,该梯度仪系统是最有效 I. INTRODUCTION The G-801G Ocean Proton Gradiometer has a high resolution of the total magnetic field, automatic correction of diurnal variations and a measure of the gradient as an additional geophysical variable, which substantially improves the quality of marine magnetic data And effect. The proton gradiometer system is easy to install on a geophysical vessel and interoperates with existing seismic and gravity equipment to further enhance the overall investigative capabilities. The G-801G uses two synchronized high-sensitivity G-801 marine proton magnetometers to simultaneously measure the total magnetic field of the Earth by towing two sensors one after the other at a distance from the same cable. The total magnetic field and gradient (differential measurements between the two sensors) are recorded in real time on a dual analog tape recorder. In the meantime, the total field for each magnetometer can be digitally recorded (a total of 12 BCD characters) for efficient computer filtering, correction of navigation errors, and derivation of the total magnetic field for time-domain elimination. The Gradiometer system is most effective where magnetometer base stations can not be used, especially in very active magnetic fields such as magnetic poles or magnetic equatorial zones