Space Objects Passive-Detecting Technology Using Direct-Broadcasting-Satellite Illuminators

The background of this paper is one of the "863 program" projects: "the technology of space objects passive-detecting system using DBS(Direct-Broadcasting-Satellite) illuminators". System implementation scheme, simulation of system detection performance and key technology problems of the system are investigated in order to complete the feasible researches on this technology.This thesis consists of five chapters. Chapter one is the preface. In this chapter, the origin and the advantage of this project, and the history of radar of illuminators of opportunity are introduced. In chapter two, system implementation scheme is studied. Space objects passive-location method is presented at the beginning of this chapter. Then, corresponding time-domain signal processing method of the system, factors that influence the system processing gain and the reconstruction scheme of DBS receiving system are analyzed. In chapter three, the detection performance of the system is analyzed and simulated. Taking satellite Sinosat-1 as an example, it lays emphasis on the requirement of system processing gain in order to detect low or middle orbit space-borne targets. Also, it points out other factors that have influence on system's detection performance. Finally, detection performance of the system that uses Sinosat-1 to detect ISS(International-Space-Station) is simulated, thus the simplified model used is validated. In chapter four, system implementation block is presented, and key technical problems of the system are pointed out and analyzed. In chapter five, the main work of this thesis is summarized. Also, it puts forward some problems to be investigated deeply in future.