In this paper,a new approach is proposed for human object motion detection and localization with(Pyroelectric Infrared) PIR sensing.A hierarchical architecture of visibility of Fresnel lens is presented with spatial-modulated FoV(Field of View).Firstly,the FoVs of Fresnel lens array in a sensor node are modulated to achieves single degree of freedom(DOF) spatial partition;then the algorithm is proposed to coordinate multiple sensor nodes to achieve two DOF spatial partitions.The experiments show that the me...