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

Claim 4:
5. The method according to claim 1, wherein, in (7a), 10 features are obtained, comprising range dimension extension ΔL, velocity dimension extension ΔV, number of threshold-crossing points N, total energy SE, principal component energy ME, principal component proportion MP, secondary component mean value VEA, secondary component variance VEV, secondary component standard deviation VES and entropy E, expressed by the following formula;, Δ
    ⁢
    L
   
   =
   
    Δ
    ⁢
    
     R
     ⁡
     (
     
      r_top
      -
      r_down
      +
      1
     
     )
    
   
  
  ⁢
  

  
   
    Δ
    ⁢
    V
   
   =
   
    Δ
    ⁢
    
     v
     ⁡
     (
     
      d_right
      -
      d_left
      +
      1
     
     )
    
   
  
  ⁢
  

  
   N
   =
   
    
     ∑
     
      i
      =
      1
     
     H
    
    
     q
     i
    
   
  
  ⁢
  

  
   SE
   =
   
    
     ∑
     
      i
      =
      1
     
     N
    
    
     energy
     i
    
   
  
  ⁢
  

  
   ME
   =
   
    
     ∑
     
      j
      =
      1
     
     n
    
    
     main_energy
     j
    
   
  
  ⁢
  

  
   MP
   =
   
    ME
    /
    SE
   
  
  ⁢
  

  
   VEA
   =
   
    
     (
     
      SE
      -
      ME
     
     )
    
    /
    
     (
     
      N
      -
      n
     
     )
    
   
  
  ⁢
  

  
   
    V
    ⁢
    E
    ⁢
    V
   
   =
   
    
     ∑
     
      i
      =
      1
     
     
      N
      -
      n
     
    
    
     
      
       [
       
        
         energy
         i
        
        -
        
         
          (
          
           
            S
            ⁢
            E
           
           -
           
            M
            ⁢
            E
           
          
          )
         
         /
         
          (
          
           N
           -
           n
          
          )
         
        
       
       ]
      
      2
     
     /
     
      (
      
       N
       -
       n
      
      )
     
    
   
  
  ⁢
  

  
   
    V
    ⁢
    ES
   
   =
   
    sqrt
    ⁢
    
     {
     
      
       ∑
       
        i
        =
        1
       
       
        N
        -
        n
       
      
      
       
        
         [
         
          
           energy
           i
          
          -
          
           
            (
            
             
              S
              ⁢
              E
             
             -
             
              M
              ⁢
              E
             
            
            )
           
           /
           
            (
            
             N
             -
             n
            
            )
           
          
         
         ]
        
        2
       
       /
       
        (
        
         N
         -
         n
        
        )
       
      
     
     }
    
   
  
  ⁢
  

  
   E
   =
   
    -
    
     
      ∑
      
       i
       =
       1
      
      N
     
     
      
       p
       i
      
      ⁢
      ln
      ⁢
      
       p
       i, Wherein ΔR is the range resolution of the RD map, r_top and r_down are the vertical coordinates corresponding to the uppermost and lowermost non-zero pixels respectively; Δv is the velocity resolution of the RD map, H is the total number of pixel points of the RD map, d_right and d_left the lateral coordinates corresponding to the rightmost and leftmost non-zero pixels respectively;, q
   i
  
  =
  
   {
   
    
     
      
       1
      
      
       
        
         if
         ⁢
            
         
          rdenergy
          i
         
        
        ≠
        0
       
      
     
     
      
       0
      
      
       
        
         if
         ⁢
            
         
          rdenergy
          i
         
        
        =
        0
       
      
     
    
    ,, wherein rdenergyi is the energy value of the ith pixel in the RD map, and energyi is the energy value of the ith non-zero pixel in the RD map; main_energyj is the energy value of the jth non-zero pixel of the main component; n is the number of non-zero pixels of the main component; pi=energyi/SE wherein sqrt(⋅) represents extracting the square root of the element in the bracket, and ln(⋅) represents solving the natural logarithm for the elements in the bracket.