China Research Institute of Radio wave Propagation(CRIRP);
Beijing 100041;
China;
Department of physics;
Harbin Institute of Technology;
Harbin 150001;
China;
School of Physics and Optoelectronic Engineering;
Xidian University;
Xi’an 710126;
China;
polar; mesosphere; radar; echoes; gravity; wave; dusty; plasma; layers;