2016, 38(5): 1249-1255.
doi: 10.11999/JEIT150947
Abstract:
To improve the objectivity of evaluation for electromagnetic environment complexity and its influence on electronic information system, taking communication system as an example, the springhead characters of electromagnetic environment complexity, namely signal to interference and noise ratio, is analyzed. The mapping relation between electromagnetic environment grades and the performance, for different systems including 2FSK, BPSK, QPSK, MSK, and QAM is reconstructed. By putting forward electromagnetic environment margin and signal margin, the atlas of electromagnetic environment complexity for typical data communication system is provided. The atlas provides a direct conversion way from signal intensity, interference and noise intensity to the complexity of the electromagnetic environment. Based on this, polarization information extraction and real time spectrum analysis technique for electronic information system are researched. Then, the system composition for measuring and evaluating electromagnetic environment is presented and the operating principle is also analyzed. Based on computer simulation technique, different effects of four communication systems are given: the electromagnetic environment complexity for communication system using MSK and vertical monopole is III grade; that for 64-QAM and horizontal dipole is V grade; that for QPSK and horn antenna is IV grade; that for 2FSK and aperture antenna is II grade. Simulation results indicate that electromagnetic environment component for different communication systems can be effectively obtained by the above-mentioned measuring system, and electromagnetic environment has different effects on the different communication systems just as electromagnetism complexities for different targets are distinct.