Patent ID: 11897635
Assignee: SPACE ENGINEERING UNIVERSITY
Field: Transport (Mechanical engineering)
Classification: CPC B  G | IPC B  G

Claim 12:
13. The method for maintaining Walker constellation formation according to claim 12, wherein the step of determining the relational expression of the second relative drift amount varying over time within the simulation time period further comprises:
the relational expression of the second relative drift amount varying over time within the simulation time period is a sixth formula, which is written as:, {
  
   
    
     
      
       
        Δ
        ⁢
        
         Ω
         ⁡
         (
         t
         )
        
       
       =
       
        
         Δ
         ⁢
         
          Ω
          0
         
        
        +
        
         
          
           k
           ∼
          
          1
          Ω
         
         ⁢
         t
        
        +
        
         
          0
          .
          5
         
         ⁢
         
          
           k
           ∼
          
          2
          Ω
         
         ⁢
         
          t
          2
         
        
        +
        
         O
         ⁡
         (
         
          t
          2
         
         )
        
       
      
     
    
    
     
      
       
        Δ
        ⁢
        
         λ
         ⁡
         (
         t
         )
        
       
       =
       
        
         Δλ
         0
        
        +
        
         
          
           k
           ∼
          
          1
          λ
         
         ⁢
         t
        
        +
        
         
          0
          .
          5
         
         ⁢
         
          
           k
           ∼
          
          2
          λ
         
         ⁢
         
          t
          2
         
        
        +
        
         O
         ⁡
         (
         
          t
          2
         
         )
        
       
      
     
    
   
   ,
  
 

where ΔΩ(t) represents a right ascension of ascending node as a function of time, Δλ(t) represents an along-track angle as a function of time, ΔΩ0 is an initial value of relative drift of the right ascension of ascending node, Δλ0 is an initial value of relative drift of the along-track angle, {tilde over (k)}1Ω and {tilde over (k)}2Ω are a residual term of a first-order variation rate and a residual term of a variation acceleration of the relative drift of the right ascension of ascending node after the first offset, respectively, {tilde over (k)}1λ and {tilde over (k)}2λ are a residual term of a first-order variation rate and a residual term of a variation acceleration of the relative drift of the along-track angle after the first offset, respectively, and O(t2) is a higher-order term after the first offset.