Focus-Before-Detection: Part II Figure 11. Target discriminated results by different methods. (a) Third-order polynomial GRT in f2-f3 plane. (b) Third-order PFT in f2-f3 plane. (c) Third-order polynomial GRT in f1-f3 plane. (d) Third-order PFT in f1-f3 plane. (e) Third-order polynomial GRT in f1-f2 plane. (f) Third-order PFT in f1-f2 plane. 42 IEEE A&E SYSTEMS MAGAZINE JANUARY 2018