Patent ID: 11914068
Assignee: TAIYUAN UNIVERSITY OF TECHNOLOGY
Field: Measurement (Instruments)
Classification: CPC G  Y | IPC G

Claim 8:
9. The method for ranging by the radar ranging system based on the true random generator according to claim 8, wherein:
In Step 6, the digital signal is cross-correlated with the true random binary sequence in the memory (3), and the calculation formula of radar detection range is as follows:, R
     ms
    
    (
    τ
    )
   
   =
   
    
     
      1
      T
     
     ⁢
     
      
       ∫
       0
       T
      
      
       
        m
        ⁡
        (
        t
        )
       
       ⁢
       
        
         S
         IF
        
        (
        
         t
         +
         τ
        
        )
       
       ⁢
       dt
      
     
    
    =
    
     
      1
      
       2
       ⁢
       T
      
     
     ⁢
     α
     ⁢
     
      a
      TX
     
     ⁢
     
      
       a
       LO
      
      ·
      
       exp
       ⁡
       (
       
        j
        ⁡
        (
        
         
          
           ω
           c
          
          ⁢
          
           τ
           0
          
         
         -
         
          θ
          R
         
        
        )
       
       )
      
      ·
      
       
        ∫
        0
        T
       
       
        
         
          m
          ⁡
          (
          t
          )
         
         ·
         
          m
          ⁡
          (
          
           t
           -
           
            τ
            0
           
           +
           τ
          
          )
         
        
        ⁢
        dt
       
      
     
    
   
  
  ,
 

In the above formula, T is the time required to generate 2N−1 true random binary sequences, and τ0 is the time when a pulse peak appears in the cross-correlation between the intermediate frequency signal and the true random binary sequence m(t), which is namely the delay time;
The resolution of radar is calculated by the formula:, Δτ
  =
  
   
    1
    2
   
   ×
   
    c
    
     f
     c
    
   
  
 

In the above formula, c is the speed of light in vacuum, and fc is the frequency of the carrier signal;
The maximum radar detection range is calculated by the formula:
R=(2N−1)×Δτ, where 2N−1 is the number of true random binary sequences.