Patent ID: 11908319
Assignee: XIDIAN UNIVERSITY
Field: Control (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. The speed measurement method according to claim 1, wherein, in step 8), compensating the mis-detection data by interpolation is achieved by the steps of:
performing different interpolations at a position in a convoy based on temporal data {circumflex over (t)}j,k;
if {circumflex over (t)}j, k is temporal data for the middle of the convoy, the compensation formula is:, t
     ^
    
    
     j
     ,
     k
    
   
   =
   
    
     
      t
      ^
     
     
      j
      ,
      
       k
       -
       1
      
     
    
    +
    
     
      
       
        
         t
         ^
        
        
         i
         ,
         k
        
       
       -
       
        
         t
         ^
        
        
         i
         ,
         
          k
          -
          1
         
        
       
      
      
       
        
         t
         ^
        
        
         i
         ,
         
          k
          +
          1
         
        
       
       -
       
        
         t
         ^
        
        
         i
         ,
         
          k
          -
          1
         
        
       
      
     
     ⁢
     
      (
      
       
        
         t
         ^
        
        
         j
         ,
         
          k
          +
          1
         
        
       
       -
       
        
         t
         ^
        
        
         j
         ,
         
          k
          -
          1
         
        
       
      
      )
     
    
   
  
  ,
 

if {circumflex over (t)}j, k is the temporal data at the end of the convoy, the compensation formula is:, t
     ^
    
    
     j
     ,
     k
    
   
   =
   
    
     
      t
      ^
     
     
      j
      ,
      
       k
       -
       1
      
     
    
    +
    
     
      
       
        
         t
         ^
        
        
         i
         ,
         k
        
       
       -
       
        
         t
         ^
        
        
         i
         ,
         
          k
          -
          1
         
        
       
      
      
       
        
         t
         ^
        
        
         i
         ,
         
          k
          -
          1
         
        
       
       -
       
        
         t
         ^
        
        
         i
         ,
         
          k
          -
          2
         
        
       
      
     
     ⁢
     
      (
      
       
        
         t
         ^
        
        
         j
         ,
         
          k
          +
          1
         
        
       
       -
       
        
         t
         ^
        
        
         j
         ,
         
          k
          -
          2
         
        
       
      
      )
     
    
   
  
  ,, and
if {circumflex over (t)}j, k is the temporal data at the head of the convoy, the compensation formula is:, t
     ^
    
    
     j
     ,
     1
    
   
   =
   
    
     
      t
      ^
     
     
      j
      ,
      2
     
    
    +
    
     
      
       
        
         t
         ^
        
        
         i
         ,
         2
        
       
       -
       
        
         t
         ^
        
        
         i
         ,
         1
        
       
      
      
       
        
         t
         ^
        
        
         i
         ,
         3
        
       
       -
       
        
         t
         ^
        
        
         i
         ,
         
          k
          -
          2
         
        
       
      
     
     ⁢
     
      (
      
       
        
         t
         ^
        
        
         j
         ,
         3
        
       
       -
       
        
         t
         ^
        
        
         j
         ,
         2
        
       
      
      )
     
    
   
  
  ,
 

where {circumflex over (t)}i,k is a measurement time of a k-th vehicle in each group passing an i-th geomagnetic sensor in each group, and {circumflex over (t)}j, k is a measurement time of a k-th vehicle in each group passing a j-th geomagnetic sensor in each group, and {circumflex over (t)}j, 1 is a measurement time of a first vehicle in each group passing the j-th geomagnetic sensor in each group, and similarly {circumflex over (t)}j, k−1 is a measurement time of a k−1-th vehicle in each group passing the j-th geomagnetic sensor in each group, and {circumflex over (t)}i, 1 is the measurement time of the first vehicle in each group passing the i-th geomagnetic sensor in each group, and tîj, k+1 is a measurement time of the k+1-th vehicle in each group passing the j-th geomagnetic sensor in each group, and {circumflex over (t)}j, k−2 is a measurement time of the k−2-th vehicle in each group passing the j-th geomagnetic sensor in each group, and {circumflex over (t)}i,k−1 is the measurement time of the k−1-th vehicle in each group passing the i-th geomagnetic sensor in each group, and {circumflex over (t)}i, k−2 is the measurement time of the k−2-th vehicle in each group passing the i-th geomagnetic sensor in each group, and {circumflex over (t)}i, 2 is the measurement time of the second vehicle in each group passing the i-th geomagnetic sensor in each group, and {circumflex over (t)}i, 3 is the measurement time of the third vehicle in each group passing the i-th geomagnetic sensor in each group, and {circumflex over (t)}j, 2 is the measurement time of the second vehicle in each group passing the j-th geomagnetic sensor in each group, and {circumflex over (t)}i, 3 is the measurement time of the third vehicle in each group passing the j-th geomagnetic sensor in each group.