Analysis Of Target Echo Signals For Radio-Frequency Antenna Fuze

The echo signal characteristics of near-field movement target in the fuze radio frequency simulation system and electromagnetic compatibility of multi-antennas are presented in this thesis. The main contents of this work are as following:1. The radiation principle of slotted rectangular waveguide antenna is investigated, and the analytic method for electrical net ports is used to investigate the coupling between antennas. The coupling problem of antennas on missile is simulated to analyze the variational rule by electromagnetic simulation software. By using Uniform Geometry Theory of Diffraction, a study of predicting the far-field pattern of antennas mounted on the fuselage of a missile is described, and the method of computing isolation between antennas is introduced.2. The electromagnetic scattering characteristic of moving target in the near-field is analyzed by applying Physical Optics method and cell method. Arbitrarily shaped targets are precisely modeled by software (taking the standard sphere as an example). From the basic theory of Physical Optics method, the spherical wave is supposed as the incident, the antenna pattern and Doppler frequency shift effect on the moving target are considered. The results using this method calculating RCS of target in the near-field is substituted into the fuze circuit model, which is easy to imply and useful in the radio frequency simulation systems.3. Based on the above calculation principle, this simulation software for the echo characteristics calculation is developed by the mixed programming of Fortran and MATLAB on Visual C++ platform. Applied and appraised by the relevant department, the software is characterized by steadily running, correct result, easy operating, and has important significance for engineering.