Numerical results Beamformed for Level 1, (add noise) Beamformed for Level 1, (add noise) 30 900 Beamformed for level 1 (過两科学大季 A Direct Numerical Imaging Method 33 National University of Defense TechnologyA Direct Numerical Imaging Method Numerical results 33 10 20 30 40 50 60 70 80 0 100 200 300 400 500 600 700 800 900 Beamformed for Level 1, (add noise). Beamformed for Level 1, (add noise). 20 30 40 50 60 70 80 100 200 300 400 500 600 700 800 900 Beamformed for level 1