1. Ph.D. Student, College of Field Engineering, Army Engineering Univ. of PLA, Haifuxiang 1st, Qinhuai District, Nanjing 210007, China.
2. Lecturer, College of Field Engineering, Army Engineering Univ. of PLA, Haifuxiang 1st, Qinhuai District, Nanjing 210007, China (corresponding author).
3. Professor, College of Field Engineering, Army Engineering Univ. of PLA, Haifuxiang 1st, Qinhuai District, Nanjing 210007, China.