船载重力测量数据不同测区系统偏差纠正方法研究

分析了我国近海海域船载重力测量数据特征,并提出了消除不同测区之间重力测线上重力异常存在系统偏差的方案。提出了参考线的选择标准,利用参考测线上交叉点处的残差重力异常不符值,纠正其他测线重力异常的新思路。结果表明,对测线重力进行纠正后,不同测区的重力值不存在系统偏差,交叉点处不符值明显改善,测线上纠正后重力异常明显优于纠正前的重力异常。

System Error Correction for Shipborne Gravimetric Data form Different Regions of Offshore in China

The characteristics of shipborne gravimetric data from offshore China were analysed，and a method to eliminate systematic deviation in the gravity for different survey lines located in different regions is also proposed. A criteria for determining shipborne gravimetric survey lines for base lines is presented，and the residual disturbance gravity at the cross point between two different survey lines on the base line was used to rectify the other values for different shipborne gravimetric survey lines. These experiemental results show that，in accordance with the criteria presented，when correcting the gravity of the survey line in the proposed method the gravity value difference on different lines does not include a systematic bias，the intersections of discrepancies significantly improved，and the survey lines to correct the gravity disturbance were significantly better than those without pre-corrected gravity disturbance.