The method must return a target object.
方法必须返回目标对象。
Specialization object: a subclass of the target that overrides the creation method to return a mock instead of a collaborator.
特殊化对象：覆盖创建方法以返回模仿对象而不是合作者的目标的子类。
An inverse filter for return signal to restore target signature and a restraining image sidelobe method used matched filter are provided.
提出了对回波信号逆滤波以恢复目标特征及采用匹配滤波来抑制成像旁瓣的方法。
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