在相对误差意义下定义了针对一种简单的顺序滤波器的两种相对误差准则 ,并在该准则基础上得到了相应的最佳估值。该结果进一步完善了非线性滤波器研究的理论体系 ,为进一步开展该领域的研究提供了一种可供借鉴的新思路和方法 In the sense of relative error, two relative error criteria for a simple sequential filter are defined, and the corresponding best estimate is obtained based on the criterion. The result further improves the theoretical system of nonlinear filter research and provides a new way of thinking for further research in this field