MIMO Fuze Baseband Signal And Circuit Research

Multiple Input Multiple Output fuse is a new type radio fuse based on MIMO theory,it is a combination of traditional radio fuse and MIMO theory.The transmitting signals of traditional radio fuse form high-gain narrow beams in space while the transmitting signals of MIMO fuse form low-gain wide beams because they are orthogonal between each other.This new type of radio fuse can bring many improvements on the performance of fuse.It can detect the target direction accurately,improve the anti-jamming ability and enhance the velocity resolution of the fuse.This article mainly studied the design of orthogonal transmitting signals,the detection algorithm of target's direction,distance and velocity,and the hardware implementation of signal processing circuit.Two related papers were published and a national defense patent was applied.The basic theory and principle of MIMO fuse were studied and the orthogonal phase codes were designed by Genetic Algorithm as the transmitting signals.The influence of the code length and Doppler frequency on the orthogonality of the phase codes were analyzed and its superiority as the transmitting signal waveform of MIMO fuse was proved.The basic principle of MIMO fuse signal processing was studied.The algorithm to detect the direction,distance and velocity of target based on hardware implementation was designed.When detecting the target direction,the MUSIC algorithm was proposed which was modified by unitary transformation and QR decomposition.And the realization of the modified algorithm in hardware circuit was achieved.Combining with the characteristics of MIMO fuse diversity and multiplexing,in order to get the distance and velocity of the target and judge it,a method of multi-path integrated moving target detection and CFAR was proposed.According to the system parameters,the software and hardware designs of signal processing board were completed.The design,welding and debugging of signal input module,clock signal module,program memory module,FPGA module and power supply module were completed.And the functions of each module were verified.The software design was realized using Verilog HDL hardware language.The results of the signal processing circuit board were consistent with the MTALAB simulation results,and the feasibility of the base-band signal processing circuit of the fuse system was proved.