用局部线性方法给出未知函数的M-估计，用两步估计方法给出参数的M-估计。
The robust M-estimate of the unknown function is proposed by local linear method, and the robust M-estimate of the unknown parameter by tow step method.
对应于方差参数这两种估计的回归系数的两种两步估计，它们的均方误差大致相当。
However, two-stage estimates of regression coefficients corresponding to these two estimates have approximate equal mean square error.
同时，结合相位编码步进频率信号形式提出在高速目标情况下实现精确速度测量的两步估计方法。
Simultaneously, the method implementing precise velocity estimation in two steps associative with PCSF signal characteristic under high moving targets is presented.
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