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1 GLOBAL GEOLOGY Vol. 34 No. 1 Mar P A doi /j. issn Study on target detection rate of aeromagnetic survey WU Guo-chao YUAN Yuan ZHANG Chong College of Geo-exploration Science and Technology Jilin University Changchun China Abstract 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. Key words aeromagnetic survey target detection rate quantitative analysis 0 UAV AA06A yuanyuan12@ mails. jlu. edu. cn

2 nt 0. 1 ~ 1 nt 1 nt Lilley 11 1 s nt Hz nt 18 Stephen 14 UXO Levenberg -Marquart David m 50 m 40 m 30 m 20 m 100 m

242 34 90 0. 1 A /M 2 m 19 4 2. 0 nt 1 40 m 40 m 1.

3 A /M 2 m nt 1 40 m 40 m a b ΔT 1994 Fig. 1 Profile of magnetic anomaly ΔT and target model of different sizes a 200 m b 250 m c 300 m d 350 m Fig. 2 2 ΔT Contour map of magnetic anomaly ΔT under different flight levels

1 243 3 1 2 3 4 20 100 m 50 m 200 m 1 ΔT 200 m 250 m ΔT 34. 64% 300 m 3 200 m 54. 08% 2 nt 200 m Fig.

4 m 50 m 200 m 1 ΔT 200 m 250 m ΔT % 300 m m % 2 nt 200 m Fig. 3 Profile of magnetic anomaly ΔT and target model of different buried depth a b ΔT 3 40 m 50 m 100 m 150 m 200 m 250 m m

5 D = 1 2 L /F 1 L P D 1 Table 1 1 Relation between signal to noise and information density S N m m m m m m ΔT 72% 20% ~ 120 m 100 ~ 140 m 100 m m m 80% 4 b 20% ΔT 10 m 2 nt 90 20% 2. 2 nt A /m 4 a 5

6 1 245 a b 20% Fig. 4 4 Comparison of magnetic anomaly contour map of multi -objective models with and without random noise 60% 110 m m 300 m 200 m 300 m 100 m m ΔT % 100 m ΔT % 5 Fig. 5 Target detectable rate under different flight levels 2

7 Fig. 6 J YU Xian-li LIU Shun-an LIU Jia-lin. Application of Target detectable rate under different survey unmanned aerial vehicle for geophysical surveying J. line spacing China Mining Magazine J m LIU Shan-li LI Wei SUN Guo-sheng et al. Application of high-precision magnetic measurement in checking Kelidai gold deposit Inner Mongolia J. Global Geolo- 1. M. gy GUAN Zhi-ning. Magnetic field and magnetic survey M. Beijing Geological Publishing House et al. Extracting weak anomaly in gravity and magnetic D. field with self-correlation filtering method J. Global Geology GUO Zhi-hong. The practical improvement of forward and inversion technique on aeromagnetic gradient data and its application doctor's degree thesis D. Beijing China University of Geosciences M XIONG Sheng-qing YU Chang-chun GUI Su-wen et al. High-precision aero-magnetic survey in medium-height mountainous areas M. Beijing Geological Publishing House C J CONG Li-juan YU Xue-zhong XU Kun et al. Application of geology geophysics geochemistry and remote sensing methods for aeromagnetic anomaly investigation in Erlian -Dongwuqi area of Inner Mongolia taking aeromagnetic anomaly C as example J. Global Geology J SHI Jian-min HAN Ji-long HU Xin. Experiences of filtering and inspecting of aero-magnetic anomalies in Great Xing'an Range Heilongjiang J. Global Geology J HAN Zhao-hong WU Yan-gang ZHANG Cheng-hai 9. Hartley J MA Guo-qing HUANG Da-nian DU Xiao-juan et al. Hartley transform in the application of the derivatives of potential field gravity and magnetic data J. Journal of Jilin University Earth Science Edition J WANG Yan-guo ZHANG Feng-xu WANG Zhu-wen

8 1 247 et al. Edge detection of potential field using normalized differential J. Journal of Jilin University Earth Science Edition Lilley F E M. Optimum direction of survey lines J. Geophysics J XUE Dian-jun. The technique for controlling flying altitude quality in aeromagnetic survey J. Geophysical & Geochemical Exploration physical & Geochemical Exploration J CHEN Bin XIONG Sheng-qing ZHAO Bai-min et al. The preliminary study on flight altitude of aero-magnetic survey J. Progress in Geophysics Norton S J Witten A J. Target parameter estimation and survey design in magnetometry J. Journal of Environment and Engineering Geophysics Wright D J McDonald J R Khadr N et al. A direct comprison of airborne and ground magnetometer array data collected over a seeded UXO site J. Symposium on the Application of Geophysics to Engineering and Environmental Problem J LU Peng-yu. Two-dimensional microgravity measurement and target detection rate J. Journal of Jilin Univercity Earth Science Edition Suppl Ebner E. Developments in potential field method and their application to petroleum exploration in western Canada J. CSEG Reader J ZHANG Hong-rui FAN Zheng-guo. Recent advances in aerogeophysical techniques used abroad J. Geo- 19. DZ /T S Ministry of Geological and Mineral Resources of China. DZ /T criterion of aeromagnetic survey S. Beijing Standards Press of China M XIONG Sheng-qing ZHOU Xi-hua GUO Zhi-hong et al. Theory method and application of the airborne gravity prospecting M. Beijing Geological Publishing House J. QIN Bao-hu. Guide for high precision magnetic survey method J. Hunan Geology Suppl

~ 121 E 40 ~ 41 N MT Fig. 1 1 Location map of geographical exploration

~ 121 E 40 ~ 41 N MT Fig. 1 1 Location map of geographical exploration 34 1 2015 3 GLOBAL GEOLOGY Vol. 34 No. 1 Mar. 2015 1004 5589 2015 01 0194 09 130026 P631 A doi 10. 3969 /j. issn. 1004-5589. 2015. 01. 023 Assessment on geophysical exploration effect in Xingcheng areas