A Design And Implementation Of GPS Aiming Jammer

Nowadays satellite navigating and positioning technology represented by Global Positioning System(GPS) is deeply and widely used in military and civil commercial areas.The confrontation of electronic information plays an important part in modern warfare.Most precision-striking weapons have to rely on GPS navigation and positioning technology. Meanwhile, GPS signal can be easily disturbed, which will cause the receiving device unable to obtain accurate navigating and positioning result. In this context,GPS signal jamming technology is raised,which plays a more important role in modern warfare.This paper conducted further research to many common GPS signal interface technology and proposed a design and implementation scheme of GPS aiming jamming machine by separated transmitting and receiving aiming at the need for electronic information warfare.Then gived the deep research to whole machine's hardware&software design and realization as well as jamming performance of final prototype.The main achievements of this paper is as followed:First of all,the structure and modulation&demodulation mechanism of GPS signal were analyzed,the advantages and disadvantages of various GPS signal jamming technology including suppressive jamming,deceptive jamming,repeater jamming were compared.GPS aiming jamming machine model was proposed by separated transmitting and receiving which aim at the efficiency and difficulty of interface.Then, the system designing and software&hardware implementation of GPS repeater aiming jamming machine were introduced,The scheme adopts the method of modular design which was divided into three modules,after confirming the structure,function and technical requirements of each module,and the rationality of the design of the whole machine were fully proved.After that,according to the functional requirements of each module in the analog interface signal frequency transmitting part, I optimized and verified the structure and parameter of multiple circuit modules of the hardware platform in the jamming machine then accomplished GPS jamming machine's circuit schematic diagram and PCB design. Through further studied to the key technology in the part of producing digital intermediate frequency signal I accomplished the FPGA software implementation and simulation&verification to the function of digital intermediate frequency based on VerilogHDL language in Quarstus II.By the end, I finished the performance test and analysis to the circuit module of jamming prototype after implementing the software&hardware platform,all test results meeted technical requirements in the scheme of design.The correctness and effectiveness of the designing&realization to different module's software&hardware in the whole machine were verified.GPS radio frequency interface signal aligns to 1575.42MHz,and interfaces the positioning information successfully.The GPS jamming machine owns certain engineering application value.