KSS31M型海洋重力仪阻尼延迟时间修正后对重力测网精度的影响

Effect of the corrected KSS31M marine gravity-meter's delay-time on the marine gravity measurement precision

对KSS31M型海洋重力仪阻尼延迟时间进行了修正,分别用修正前的110s阻尼延迟时间和修正后的60s阻尼延迟时间对南海某工区的重力数据进行了校正和处理,结果表明:用110s阻尼延迟时间对数据进行校正后得到的测量精度在平差前为1.6mGal,平差后为1.0mGal,用60s阻尼延迟时间对数据进行校正后得到的测量精度在平差前为1.4mGal,平差后为0.8mGal,平差前和平差后的测量精度均提高了0.2mGal。此结果证明了利用船只机动转向确定海洋重力仪在测量过程中的实际阻尼延迟时间方法的必要性和实际应用价值。

The delay-time of the KSS31M marine gravity-meter was corrected.The gravity data and GPS data from the Northern South China Sea was processed with lag time of 60 s and 110 s respectively.The result indicates that the measurement precision of the network corrected with the delay-time of 110 s is about 1.6 mGal before the adjustment processing and about 1.0 mGal after the adjustment processing.The measurement precision of the network corrected with the delay-time of 60 s is about 1.4 mGal before the adjustment processing and about 0.8 mGal after the adjustment processing.It is obvious that the measurement precisions were improved about 0.2 mGal by the delay-time of 60 s.The result intensively validates that the method named verifying the delay-time of marine gravity-meter by the vessel turn-manoeuvre is necessary and useful.