GT-1M海洋重力仪与KSS31M海洋重力仪的对比

The comparison between GT-1M and KSS 31M marine gravitymeters

为了检验俄罗斯、加拿大合作生产的GT-1M海洋重力仪与德国KSS31M海洋重力仪的工作性能,验证GT-1M重力数据的可靠性,将GT-1M采集的3条重力剖面与KSS31M重力仪采集的重力测网进行了对比分析。结果显示:GT01剖面与26条KSS31M重力测线的交点差均值为0.31mGal,交点差均方根为2.51mGal;GT02剖面与11条KSS31M重力测线的,交点差均值为–0.78mGal,交点差均方根为1.97mGal;全部交点差均值为–0.01mGal,均方根(RMS)为2.32mGal。GT01剖面与KSS31M测网网格化切割的剖面的变化趋势一致,重力变化幅值基本吻合,相关系数为0.98;而GT02剖面位于KSS31测网边缘,网格化切割的KSS重力剖面不能反应真实的重力场,虽然GT02剖面变化趋势一致,但相关系数仅为0.94,在相位上也明显有误差。考虑到测网位于海底地形崎岖的深水区,而且两次测量时间间隔达3a,因此GT-1M重力仪测试的结果还是基本与KSS31M重力仪吻合的,数据是可靠的。该分析结果对今后的重力测量工作有参考价值。

Three gravity profile data acquired by GT-1M marine gravitymeter produced in Russia and Canada and by KSS31 M marine gravitymeter produced in Germany were compared. The mean value of intersection difference between GT01 profile and 26 KSS31 M gravity survey lines was 0.31 m Gal. The RMS of intersection difference was 2.51 m Gal. The mean value of intersection difference between GT02 profile and eleven KSS31 M gravity survey lines was –0.78 m Gal. The RMS of intersection difference was 1.97 m Gal. The mean value of all intersection dif-ference was –0.01 m Gal and the RMS was 2.32 m Gal. The GT01 profile had the same variation trend with the profile sliced from the gridded survey network of KSS31 M. The variation of gravity amplitude was basically consistent, and the correlation coefficient was 0.98. The GT02 profile was at the edge of the survey network of KSS31 M, so the sliced profile from the gridded measuring network of KSS31 could not reflect the real gravity field. Although they had the consistent trend, the correlation coefficient was 0.94, and they had obvious error in phase. In consideration that the measuring network was located in the deep sea with rugged terrain and the measurement intervals were up to 3 years, the test result of GT gravimeter was basically consistent with that of the KSS31 M gravimeter and the data are reliable.