提出一种干扰解耦滤波器 (DDF)设计的新方法。通过一个简单有效的代数变换 ,将具有未知输入的系统变换成一个不含未知输入的等价系统 ;利用新息定理得到一种新的干扰解耦滤波器设计方法。针对机动目标跟踪问题 ,对常规 Kalm an滤波器、最优干扰解耦观测器和干扰解耦滤波器进行了仿真比较 ,结果表明 DDF特别适用于目标高度机动且无有效机动模型的情形。 A new method of interference decoupling filter (DDF) design is proposed. Through a simple and effective algebraic transformation, the system with unknown input is transformed into an equivalent system without unknown input. A new design method of interference decoupling filter is derived by using the theorem of innovation. For the maneuvering target tracking problem, the simulation and comparison between the conventional Kalm an filter, the optimal disturbance decoupling observer and the interference decoupling filter show that the DDF is especially suitable for the case of target highly maneuvering and no effective maneuvering model.