Of Metal Target Research And Millimeter Wave Fuze Signal Processing

In the field of military affairs, the detection of the metallic targets always plays a important role. When we take advantage of the fuse to detect the metallic targets, the system of LFMCW (Linear frequency modulated continuous wave) has a high resolution, a low price and occupies smaller space in the field of short-range detection. To distinct the difference of frequency between the signal of transition and the signal of receiving leads to the distance between the target and the fuse. Then the PLD circuit finishes the processing of eco. And that is how the fuse of millimeter waves works. Certainly, in the practical application, the effect of the noise wave can not be fumbled. Base on the background above, we mainly discuss the processing of signals in the fuse of millimeter waves which applies to the metallic targets on the ground. In this text, we will discuss about:(1) Dentally introduce the basic theory of the fuse of LFMCW, and explain why we should choose this system and the RCS of some regular tank. Analyze the expression of the signals of transition and of receiving and also the characters of time-domain and frequency-domain.(2) Discuss the model of the coefficient about noise wave from the perfect grassland and the expression of the rate of signal and noise wave. Finish the simulation of the digital sequence of the Gauss-noise wave. And then research the impact of the way of the filtering of noise wave which is based on MTI.(3) Design the project after the mixer in the fuse, and draw the schematic diagram of the digital acquisition circuit. Choose the popular FPGA to accomplish FFT, modeling, the filtering of AMTI and so on. At last discuss the performance of real-time measurably.