Simulation And Software Implementation Of Passive Detection System Based On Target Signal Source

The passive detection system based on the target signal source adopts the mode of passive reception,which receives the signal sent by the target to the outside world for positioning.Since the passive detection system does not actively emit signals to the outside world,it has the characteristics of st rong concealment and strong survival ability.Therefore,passive location technology will play an increasingly important role.In recent years,passive detection has become a hot topic.Passive detection system can be used to locate the interference source so that measures can be taken to ensure the normal operation of the communication system.In passive detection system,software development is an important part.It mainly includes simulation signal source,signal processing,communication,display control and other modules.If the simulation signal source module in the software is replaced by the signal receiving module of the actual receiver,it can be applied to the actual passive detection system,and it has strong practicability.The main research contents of the thesis are as follows:Firstly,the theoretical basis of passive detection system is introduced,and the planar array signal model under the condition of line-of-sight is established.For angle positioning,the basic theory and method of single station angle measurement and the basic theory and method of multi-station joint angle measurement are introduced.Then,aiming at the positioning problem based on the information of signal arrival angle,this paper introduces several positioning algorit hms,such as DPD and GMA,discusses the principle of several algorithms,analyzes the Cramer-Rao lower bound of the theoretical positioning error and conducts simulation.In the case of single signal source and multiple signal sources,each algorithm is simulated,and its performance is analyzed and compared,which provides a basis for selecting reasonable algorithm in passive detection system software design.Finally,the software of passive detection system is designed,the composition and structure of passive detection system are analyzed,the design requirements of the software are analyzed,and the operating environment of the software is briefly explained.The simulation signal source,signal processing,communication,display control and other modules are designed,and the structure flow of each module is introduced in detail.The system flow,such as timing and state,is designed.The interface of target situation map,system state interface,environment monitoring interface and channel spectrum inter face are presented.Through the operation of the whole system,the correctness and stability of the whole system are verified.