航空重力测量数据向下延拓及其影响因素分析

Analysis of Effect and Downward Continuation of Airborne Gravity Data

结合TIK正则化算法和移去-恢复技术对航空重力测量数据进行向下延拓的仿真实验。TIK正则化算法能有效的抑制高频噪声和解决向下延拓不稳定的问题。在向下延拓过程中,测量高度、地形引力等因素对延拓结果有影响。利用移去-恢复技术能有效缓解测量高度及地形对航空重力数据向下延拓的影响。仿真实验将不同高度的重力异常向下延拓,研究高度和地形对向下延拓的影响,实验结果表明,在条件允许的情况下,测量高度应该尽可能的低,而且在进行向下延拓前需利用移去-恢复技术对其进行地形改正。

Based on the TIK regularization algorithm and the remove-restore technique, the simulation for the downward continuation of airborne gravity data was performed. TIK regularization algorithm can effectively restrain the high frequency noise, and resolve the downward continuation unstable problem. During the downward continuation process, the effect of height and terrain is existed. Using the remove-restore technique can effectively release the effect. By the experiments of airborne gravity anomalies from different flight height downward continue to the ground, the effect of height and terrain to the result of downward continuation was researched. According to the results of simulation, the measurement height of airplane is as low as possible in the permitted conditions. Meanwhile, the terrain correction before the downward continuation is essential by the remove-restore technique.