航空磁测探测目标发现率研究

Study on target detection rate of aeromagnetic survey

航空磁测探测目标发现率的评价是勘探任务的前期工作。为找出最佳的实时测量参数组合,实现快速、经济、高效探测,综合已有的目标体物性参数和实际勘探条件等先验信息,从测量剖面和平面出发进行理论模型计算。通过分析实测影响因素发现,降低飞行高度,提高磁测仪器精度及信噪比,是提高目标体发现率的有效手段。此外,通过多模型组合和概率计算实现了探测目标发现率的综合定量分析,可有效地避开测网设计中的勘探盲区。

The evaluation of detection rate on aeromagnetic anomaly target is the preliminary work of aeromagnetic survey. In order to find out a perfect combination of real-time measurement parameters and to realize a fast,low-cost and high-efficiency exploration,this paper synthesizes the priori information about property parameters of target and practical survey conditions to calculate the theory model from the perspectives of profile map and contour map. By analyzing the affecting factors in practice,it can be concluded that the approach of lowering altitude,improving the precision and signal-noise ratio of magnetic survey instrument can effectively enhance the target detection rate. Finally,a comprehensive quantitative result is achieved by analyzing the multi-model combination and calculating the probability of target detection,which can effectively avoid the blind zone in survey line design.