5.5.2赫尔默特方差分量估计法 协方差阵与权的关系: 01 L 0212 D=LA(M+N,+G GAP-I PIPA(N +N,+GGPA-1I +A(M+N,+GG PA (N+N,+GGEA (P--2A(N, +N,+GGrA'+ A(N+N,+G"N(+N,+GGrA' +oA(N +N,+GG N,(N+N,+GGA5.5.2 赫尔默特方差分量估计法 1 2 2 02 1 1 2 01 2 2 1 1 − − = = = = D D P D D P l L l L   T T B B T B B T T B B T B B T T B B T T B B T T B B T T B B T T V B B A N N G G N N N G G A A N N G G N N N G G A P A N N G G A N N G G A A N N G G A P P P A P PA N N G G A I D A N N G G A P I 1 1 2 1 2 1 1 1 2 2 0 2 1 1 1 1 2 1 1 1 2 1 1 1 1 2 1 1 2 0 1 1 1 1 2 2 2 1 2 2 2 2 0 2 1 1 1 2 1 1 1 1 1 1 2 1 1 2 0 1 1 1 1 1 1 1 2 ( ) ( ) ( ) ( ) ] [( 2 ( ) ( ) ( ) [ ( ) ] [ ( ) ] 1 − − − − − − − − − − − − + + + + + + + + + = − + + + + + + + + + + − = + + −     协方差阵与权的关系：