The Design Of Multi-channel And Multi-emitter Simulator

With the rapid development of information technology of weapons and equipment,the electronic reconnaissance system is facing increasingly complex electromagnetic environment.How to construct a realistic signal environment,so as to test and verify the complex environmental processing capability of electronic reconnaissance equipment,it is an important research topic in the designation,development and experiment of electronic warfare system.In this paper,the multi-channel complex radar signal generation technology is studied in detail,and the design and implementation of the multi-channel and multi-emitter simulator are completed.The multi-channel and multi-emitter simulator is based on the electromagnetic signal environment simulation technology.It is composed of four modules: host computer software,communication and control board,radar signal generation board and switch filter amplifier.This paper introduces signal system and the established signal model of the multi-channel and multi-emitter simulator,and the design of the hardware and software is introduced.Finally,the realization method of the time difference positioning simulation and the realization of the broadband array signal are introduced emphatically.The main work of the paper is as follows:1.The signals of the multi-channel and multi-emitter simulator are mainly AM pulse signal,continuous wave signal,linear FM signal,phase coded signal and other basic signals,first of all,the principles and characteristics of these signals are introduced in detail;Then,based on the background of the application of electronic reconnaissance equipment,different types of signal models such as pulse amplitude model,time difference location model,partition working model and broadband array signal model are established on these basic signals.2.The overall design of the multi-channel and multi-emitter simulator is given,including the hardware and software design of the host computer,communication and control board,radar signal generation board and switch filter amplifier,and the connection between each module and the communication mode are introduced,and the focus of the radar signal generation board are introduced in detail.The radar signal generation board is based on the DSP + FPGA construction platform as the core,plus the clock,power supply,DAC and other peripheral circuit modules to build a radar signal generation board of the hardware.3.In order to adapt to the requirement of passive location simulation environment of electronic reconnaissance equipment,the simulation of TDOA location technology is realized based on the multi-channel and multi-emitter simulator.Firstly,the principle of TDOA location location is introduced.Furthermore,the two-dimensional algorithm model of time difference location and the three-dimensional algorithm model are established.Then,the realization framework of the TDOA location simulation is introduced,and the TDOA location method based on radar signal generation board is introduced.Finally,the signal simulation and test verification of the TDOA location simulation method are given.The realization of the TDOA location signal simulation is completed.4.The simulation method of wideband array direction finding signal is realized based on the multi-channel and multi-emitter simulator.Firstly,the basic principle of direct digital frequency synthesis technology is introduced.Then,the polyphase structure frequency synthesis technique is proposed on the basis of this principle,and the frequency synthesis technology of polyphase structure is introduced in detail.Then,based on the radar signal generation plate,the polyphase frequency synthesis technology is realized.Finally,the realization of this technology is verified by simulation and testing.Finally,the realization of the broadband signal is completed.