Patent ID: 11906616
Assignee: XIDIAN UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G  Y | IPC G

Claim 5:
6. The method according to claim 1, wherein, in (7b2), 12 features are obtained, comprising the principal component range dimension variation MLC, principal component velocity dimension variation MVC, range dimension extension variation ΔLC, velocity dimension extension variation ΔVC, scattering point number variation NC, total energy variation SEC, principal component energy variation MEC, principal component proportion variation MPC, secondary component mean value variation VEAC, secondary component variance variation VEVC, secondary component standard deviation variation VESC and entropy variation EC, expressed by the following formula;, MLC
   =
   
    abs
    ⁡
    (
    
     
      d
      1
     
     -
     
      d
      2
     
    
    )
   
  
  ⁢
  

  
   MVC
   =
   
    abs
    ⁡
    (
    
     
      r
      1
     
     -
     
      r
      2
     
    
    )
   
  
  ⁢
  

  
   
    Δ
    ⁢
    LC
   
   =
   
    abs
    ⁢
    
     {
     
      Δ
      ⁢
      
       R
       [
       
        
         (
         
          
           r_top
           1
          
          -
          
           r_down
           1
          
         
         )
        
        -
        
         (
         
          
           r_top
           2
          
          -
          
           r_down
           2
          
         
         )
        
       
       ]
      
     
     }
    
   
  
  ⁢
  

  
   
    Δ
    ⁢
    VC
   
   =
   
    abs
    ⁢
    
     {
     
      Δ
      ⁢
      
       v
       [
       
        
         (
         
          
           d_right
           1
          
          -
          
           d_left
           1
          
         
         )
        
        -
        
         (
         
          
           d_right
           2
          
          -
          
           d_left
           2
          
         
         )
        
       
       ]
      
     
     }
    
   
  
  ⁢
  

  
   NC
   =
   
    abs
    ⁡
    (
    
     
      N
      1
     
     -
     
      N
      2
     
    
    )
   
  
  ⁢
  

  
   SEC
   =
   
    abs
    ⁡
    (
    
     
      S
      ⁢
      
       E
       1
      
     
     -
     
      S
      ⁢
      
       E
       2
      
     
    
    )
   
  
  ⁢
  

  
   MEC
   =
   
    abs
    ⁡
    (
    
     
      M
      ⁢
      
       E
       1
      
     
     -
     
      M
      ⁢
      
       E
       2
      
     
    
    )
   
  
  ⁢
  

  
   MPC
   =
   
    abs
    ⁡
    (
    
     
      
       M
       ⁢
       
        E
        1
       
      
      
       S
       ⁢
       
        E
        1
       
      
     
     -
     
      
       M
       ⁢
       
        E
        2
       
      
      
       S
       ⁢
       
        E
        2
       
      
     
    
    )
   
  
  ⁢
  

  
   VEAC
   =
   
    abs
    ⁡
    (
    
     
      
       
        S
        ⁢
        
         E
         1
        
       
       -
       
        M
        ⁢
        
         E
         1
        
       
      
      
       
        N
        1
       
       -
       
        n
        1
       
      
     
     -
     
      
       
        S
        ⁢
        
         E
         2
        
       
       -
       
        M
        ⁢
        
         E
         2
        
       
      
      
       
        N
        2
       
       -
       
        n
        2
       
      
     
    
    )
   
  
  ⁢
  

  
   VEVC
   =
   
    abs
    ⁢
    
     {
     
      
       
        
         
          ∑
          
           i
           =
           1
          
          
           
            N
            1
           
           -
           
            n
            1
           
          
         
         
          
           
            (
            
             
              e
              ⁢
              n
              ⁢
              e
              ⁢
              r
              ⁢
              g
              ⁢
              
               y
               
                1
                ⁢
                _
                ⁢
                i
               
              
             
             -
             
              
               
                S
                ⁢
                
                 E
                 1
                
               
               -
               
                M
                ⁢
                
                 E
                 1
                
               
              
              
               
                N
                1
               
               -
               
                n
                1
               
              
             
            
            )
           
           2
          
          /
          
           (
           
            
             N
             1
            
            -
            
             n
             1
            
           
           )
          
         
        
       
      
      
       
        
         -
         
          
           ∑
           
            j
            =
            1
           
           
            
             N
             2
            
            -
            
             n
             2
            
           
          
          
           
            
             (
             
              
               e
               ⁢
               n
               ⁢
               e
               ⁢
               r
               ⁢
               g
               ⁢
               
                y
                
                 2
                 ⁢
                 _
                 ⁢
                 j
                
               
              
              -
              
               
                
                 S
                 ⁢
                 
                  E
                  2
                 
                
                -
                
                 M
                 ⁢
                 
                  E
                  2
                 
                
               
               
                
                 N
                 2
                
                -
                
                 n
                 2
                
               
              
             
             )
            
            2
           
           /
           
            (
            
             
              N
              2
             
             -
             
              n
              2
             
            
            )
           
          
         
        
       
      
     
     }
    
   
  
  ⁢
  

  
   VESC
   =
   
    {
    
     
      
       
        sqrt
        [
        
         
          ∑
          
           i
           =
           1
          
          
           
            N
            1
           
           -
           
            n
            1
           
          
         
         
          
           
            (
            
             
              e
              ⁢
              n
              ⁢
              e
              ⁢
              r
              ⁢
              g
              ⁢
              
               y
               
                1
                ⁢
                _
                ⁢
                i
               
              
             
             -
             
              
               
                S
                ⁢
                
                 E
                 1
                
               
               -
               
                M
                ⁢
                
                 E
                 1
                
               
              
              
               
                N
                1
               
               -
               
                n
                1
               
              
             
            
            )
           
           2
          
          /
          
           (
           
            
             N
             1
            
            -
            
             n
             1
            
           
           )
          
         
        
        ]
       
      
     
     
      
       
        -
        
         sqrt
         [
         
          
           ∑
           
            j
            =
            1
           
           
            
             N
             2
            
            -
            
             n
             2
            
           
          
          
           
            
             (
             
              
               e
               ⁢
               n
               ⁢
               e
               ⁢
               r
               ⁢
               g
               ⁢
               
                y
                
                 2
                 ⁢
                 _
                 ⁢
                 j
                
               
              
              -
              
               
                
                 S
                 ⁢
                 
                  E
                  2
                 
                
                -
                
                 M
                 ⁢
                 
                  E
                  2
                 
                
               
               
                
                 N
                 2
                
                -
                
                 n
                 2
                
               
              
             
             )
            
            2
           
           /
           
            (
            
             
              N
              2
             
             -
             
              n
              2
             
            
            )
           
          
         
         ]
        
       
      
     
    
    }
   
  
  ⁢
  

  
   EC
   =
   
    -
    
     (
     
      
       
        ∑
        
         i
         =
         1
        
        
         N
         1
        
       
       
        
         p
         
          1
          ⁢
          _
          ⁢
          i
         
        
        ⁢
        ln
        ⁢
        
         p
         
          1
          ⁢
          _
          ⁢
          i
         
        
       
      
      +
      
       
        ∑
        
         j
         =
         1
        
        
         N
         2
        
       
       
        
         p
         
          2
          ⁢
          _
          ⁢
          j
         
        
        ⁢
        ln
        ⁢
        
         p
         
          2
          ⁢
          _
          ⁢
          j
         
        
       
      
     
     ), Wherein C1(d1,r1) and C2 (d2r2) are coordinates of central points of the principal components in the two RD maps, ΔR is the range resolution of the RD map, Δv is the velocity resolution of the RD map, r_top1, r_down1, r_top2, and r_down2 are the vertical coordinates corresponding to the uppermost and lowermost non-zero pixels in the two RD maps respectively, d_right1, d_left1, d_right2, and d_left2 are the lateral coordinates corresponding to the rightmost and leftmost non-zero pixels in the two RD maps respectively, N1 and N2 are the numbers of non-zero pixels of the two RD maps after the threshold processing respectively, SE1 and SE2 are energy sums of all non-zero pixels of the two RD maps respectively, ME1 and ME2 are energy sums of principal components of the two RD maps respectively, n1 and n2 are the numbers of non-zero pixels of principal components of two RD maps respectively, energy1_i represents the energy value of the ith non-zero pixel of the first RD map, energy2_j represents the energy value of the jth non-zero pixel of the first RD map, p1_i=energy1_i/SEi, p2_j=energy2_j/SE2, and sqrt(⋅) represent extracting the square root of the elements in brackets, abs(⋅) represents solving the absolute value of the elements in brackets, and ln(⋅) represents solving the natural logarithm for the elements in brackets.