One is with the Recursion of Observation Equation Numbers, the other is to derive the EMBET Expressions in the Processing of Trajectory Measurement Data with the Recursion of Equation Parameter Numbers.

• 一类方法是随着观测方程个数的递推;另一类方法是随着方程参数个数的递推,它能够推导出关于外弹道测量数据处理的“最佳弹道估计”(MBET)法的表达式。