Patent ID: 11940531
Assignee: THE TRUSTEES OF PRINCETON UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC A  G | IPC A  G

Claim 10:
11. The system of claim 1, wherein the processor is further configured to compute a gradient of the cost function Xw represented by:, χ
      W
    
    ⁡
    
      (
      m
      )
    
  
  =
  
    
      1
      2
    
    ⁢
    
      
        ∑
        
          s
          =
          1
        
        S
      
      ⁢
      
        
          ∑
          
            r
            =
            1
          
          
            R
            s
          
        
        ⁢
        
          
            
            
              
                                ⁢
                
                  (
                  
                    
                      x
                      r
                    
                    ,
                    
                      
                        f
                        s
                      
                      ;
                      m
                    
                  
                  )
                
              
              -
              
                                ⁢
                
                  (
                  
                    
                      x
                      r
                    
                    ,
                    
                      f
                      s
                    
                  
                  )
                
              
            
            
          
          2
        
      
    
  

where m is a wavespeed, density, attenuation map, or a combination, Psyn  the Fourier transform of the wavefield Psyn, and Pobs  is the Fourier transform of the observed wavefield Pobs.