1. Vaiq emer Tek (P) Ltd., Chemnai 600041 India; formerly, Dept. of Aerospace Engineering, Indian Institute of Technology, Madras, Chennai 600 036, India.
2. DLR Aerospace Centre, Cologne 51147 German; formerly, Dept. of Aerospace Engineering, Indian Institute of Technology, Madras, Chennai 600 036, India.
3. Dept. of Aerospace Engineering, Indian Institute of Technology, Madras, Chennai 600 036, India (corresponding author).
4. Vikram Sarabhai Space Centre, Thiruvananthapuram 695 022, India.