[2] [2] LIN Z,LIN M,HUANG Y,et al. Robust multi-objective beamforming for integrated satellite and high altitude platform network with imperfect channel state information[J]. IEEE Transactions on Signal Processing, 2019,67(24):6384-6396.

[3] [3] LIU X,LIN M,HUANG Q. Performance analysis for multi-user integrated satellite and UAV cooperative networks[J]. Physical Communication, 2019(36):100762-100772.

[4] [4] GRACE D,JIANG T,ALLSOPP S. Integrated project ABSOLUTE-Aerial base stations with opportunistic links for unexpected & temporary events[J]. IEEE Communications Magazine, 2013,54(4):31-39.

[6] [6] LI M, HONG Y, ZENG C. Investigation on the UAV-to-satellite optical communication systems[J]. IEEE Journal on Selected Areas in Communications, 2018,36(9):2128-2138.

[7] [7] AHMAD I,NGUYEN K D,LETZEPIS N. Performance analysis of high throughput satellite systems with optical feeder links[C]// IEEE Global Communications Conference(GLOBECOM). Singapore:IEEE, 2017:1-7.

[8] [8] PETKOVIC M I, DJORDJEVIC G T, MARJANOVIC Z M. Analytical approach in evaluation of outage probability of DF based hybrid satellite-terrestrial FSO cooperative system[C]// The 13th International Conference on Advanced Technologies,Systems and Services in Telecommunications(TELSIKS). Nis,Serbia:IEEE, 2017:326-329.

[10] [10] ZEDINI E,SOURY H,ALOUINI M. On the performance analysis of dual-hop mixed FSO/RF systems[J]. IEEE Transactions on Wireless Communications, 2016,15(5):3679-3689.

[17] [17] ALEXANDR K, ANATOL P, DAMIEN C. Fundamentals of manipulator stiffness modeling using matrix structural analysis[J]. Mechanism and Machine Theory, 2019,133:365-394.

[18] [18] ABLINGER J,BLUMLEIN J,FREITAS D A. Iterated elliptic and hypergeometric integrals for Feynman diagrams[J]. Journal of Mathematical Physics, 2018,59(6):45-54.

[19] [19] WOLFRAM Research. Mathematica edition: version 8.0[Z]. Champaign,IL,USA:Wolfram.Research, Inc., 2010.