Patent ID: 11906646
Assignee: SOUTHEAST UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G  Y | IPC G

Claim 2:
3. The method for estimating the air propagation delay of the direct wave according to claim 2, wherein the relationship between the arrival angle of the reflected wave and the departure angle of the reflected wave in step 2) is:, {
  
   
    
     
      
       
        
         φ
         
          r
          ,
          1
         
        
        -
        
         φ
         
          t
          ,
          1
         
        
       
       =
       π
      
     
    
    
     
      
       
        
         θ
         
          r
          ,
          1
         
        
        -
        
         θ
         
          t
          ,
          1
         
        
       
       =
       0
      
     
    
   
   ⁢
      
   or
   ⁢
      
   
    {
    
     
      
       
        
         
          
           φ
           
            r
            ,
            1
           
          
          +
          
           φ
           
            t
            ,
            1
           
          
         
         =
         π
        
        ,
        
         2
         ⁢
         π
        
        ,
        
         3
         ⁢
         π
        
       
      
     
     
      
       
        
         
          θ
          
           r
           ,
           1
          
         
         +
         
          θ
          
           t
           ,
           1
          
         
        
        =
        π
       
      
     
    
   
  
 

wherein, φr,1 means the azimuth of arrival of the reflected wave, φt,1 means the azimuth of departure of the reflected wave, θr,1 the elevation angle of arrival of the reflected wave, and θt,1 means the elevation angle of departure of the reflected wave.