Research On Signal Processing Technology Of Frequency Modulation Radio Fuze

Fuze is the device of using objective information, using environmental information, or according the pre-set conditions. In the premise of the safety of ammunition launching and usual, fuze is also the device of the ammunition ignition controlling, attitude controlling and detonation controlling. FM microwave proximity fuze system is the amplitude continuous wave radio fuze whose changing of transmitted signal frequency by changing the modulation signal amplitude, it is mainly by measuring the difference frequency of the echo signal frequency and the transmitted wave frequencies to determine the distance of the target and the fuze.Thebombing pointofsuchfuze is unrelated tothereflection characteristicsofelectromagnetic waves intargets,andthisfuzehas better propertyofdistanceselection, so theresearchofthe fuzehasimportant practicalandtheoretical meaning.This article discusses the advantages and disadvantages of the fuze of controlling distance by amplitude,and then studies and analysis the triangular wave modulation FM radio fuze, introducesthe contradictionof parameter selection, detailed deduces and analysis of the Fourier expansion of difference frequency signal inthe case of stationary and moving targets, and also demonstrates and simulates through MATLAB/Simulink,furthermore, on this basis, gives the FM radio fuze measuring distance methods.According to the measuring distance method the FM radio fuze, the article designs and implementssignal processing circuitby the analog comparators, operational amplifier and the central control unit composed by the microcontroller circuit, and simulates signal processing circuit.The signal processing circuit connects the RF front-end. Thenthrough pushing board test,acquiring and analyzing the output signal of the comparator, according to the measured frequency, obtains the speed information.Contrasted with actual target speed, the article further demonstrates the correctness of the system.At the end, this article gives the optimization FM radio fuze signal processing implementation based on the test results and the level of development of the device.