[4] [4] TAZIBT C Y,BEKHTI M,DJAMAH T. Wireless sensor network clustering for UAV-based data gathering[J]. Wireless Days, 2017,3(6):245-247.

[5] [5] HAN G,JIANG J,ZHANG C,et al. A survey on mobile anchor node assisted localization in wireless sensor networks[J]. IEEE Communications Surveys and Tutorials, 2016,18(3):2220-2243.

[6] [6] JAYATILLEKE L,ZHANG N. Landmark-based localization for unmanned aerial vehicles[C]// 2013 IEEE International Systems Conference. Manchester,UK:IEEE, 2013:448-451.

[7] [7] OKCU H,SOYTURK M. Distributed clustering approach for UAV integrated wireless sensor networks[J]. International Journal of Ad Hoc and Ubiquitous Computing, 2014,15(3):106-120.

[8] [8] RASHED S,SOYTURK M. Analyzing the effects of UAV mobility patterns on data collection in wireless sensor networks[J]. Sensors, 2017,17(2):413-512.

[10] [10] BISWAS P,LIAN T C,WANG T C. Semidefinite programming based algorithms for sensor network localization[J]. ACM Transactions on Sensor Networks, 2016,2(2):188-220.

[11] [11] MOSEK A. The mosek python optimizer api manual version 7.1(revision 62)[Z]. 2017.