Patent ID: 11941553
Assignee: HEFEI UNIVERSITY OF TECHNOLOGY
Field: IT methods for management (Electrical engineering)
Classification: CPC G | IPC G

Claim 2:
3. The method of claim 2, wherein the operation S2 comprises:
S21, in the navigation environment, determining a ship route based on a distribution of the obstacle area, the safe area, and the risk area;
S22, taking the navigation time of the ship as the variable, establishing the navigation time optimization target function J Tc of the ship on the ship route, the calculation formula of which is as follows:, J
   
    T
    ⁢
    C
   
  
  =
  
   
    [
    
     1
     +
     
      
       1
       -
       
        exp
        ⁡
        (
        
         
          -
          
           0
           .
           2
          
         
         ×
         
          T
          
           C
           ,
           alarm
          
         
        
        )
       
      
      
       1
       +
       
        exp
        ⁡
        (
        
         
          -
          
           0
           .
           2
          
         
         ×
         
          T
          
           C
           ,
           alarm
          
         
        
        )
       
      
     
    
    ]
   
   ×
   
    T
    
     C
     ,
     total
    
   
  
 

where, TC,total indicates a total navigation time of the ship navigating along the ship route;
TC,alarm indicates a ship warning time, i.e., a time when the ship navigates in the risk area on the ship route;
S23, taking the navigation risk of the ship in the risk area as the variable, establishing the ship route risk assessment function of the ship on the ship route, the calculation formula of which as follows:, r
   
    C
    ,
    
     r
     ⁢
     i
     ⁢
     s
     ⁢
     k
    
   
  
  =
  
   
    1
    Q
   
   ⁢
   
    
     ∑
     
      i
      =
      1
     
     Q
    
    
     (
     
      
       
        α
        C
       
       ×
       
        
         H
         
          C
          ,
          i
          ,
          wave
         
        
        
         H
         
          C
          ,
          max
          ,
          wave
         
        
       
      
      +
      
       
        β
        C
       
       ×
       
        
         V
         
          C
          ,
          i
          ,
          
           w
           ⁢
           i
           ⁢
           n
           ⁢
           d
          
         
        
        
         V
         
          C
          ,
          max
          ,
          wind
         
        
       
      
     
     )
    
   
  
 

where: αC+βC=1,
αC indicates a coefficient of an influence level of a wave height on a ship navigation risk;
βC indicates a coefficient of an influence level of a wind speed on the ship navigation risk;
rC,risk indicates a risk value in the ship route;
Q indicates a number of a total route segments in the ship route;
HC,i,wave indicates a wave height of an i-th route segment in the ship route;
HC,max,wave indicates a maximum wave height in the total route segments of the ship route;
VC,i,wind indicates a wind speed of the i-th route segment in the ship route; and
VC,max,wind indicates a maximum wind speed in the total route segments of the ship route.