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Air Force spectrum management in the analysis of electromagnetic compatibility

The parameters. Administration to establish the radio parameters, including user name, address, telephone, bank, bank account number, station type, nature of business, the call sign, frequency, expiry date, license number. Basic parameters of technical management station location data, station type, frequency range (transmitting and receiving frequency) to work, the basic parameters of the antenna, modulation and other parameters, sensitivity noise field. 3, the equipment database. Device database provides all types of Air Force owned the relevant technical parameters of radio equipment, including manufacturer, device model, approval code, and the frequency of upper and lower units, and units transmit power, emission identification (including the necessary bandwidth, modulation, signal type , re-use nature of information), receiver sensitivity, receiver selectivity, S / N protection ratio, the minimum link noise temperature, adjacent channel selectivity, the radar uses pulse width, pulse repetition frequency field. 4 Antenna database. Database Antenna Antenna radio system to provide relevant technical parameters, including manufacturers, antenna type, antenna type, the minimum and maximum operating frequency,[link widoczny dla zalogowanych], polarization, cross polarization discrimination ratio, cross-polarization isolation, back ratio, directivity , the largest receiver azimuth, the horizontal and vertical half-power spot beam width (3dB), noise temperature, antenna gain, antenna directional diagrams, feeder system should include the value of feeder loss per meter, combiners, splitters,[link widoczny dla zalogowanych], couplers , filters and other related technical parameters. 5, geographic information database. Air Force spectrum management of geographic information database of geographical data which are used to provide basic geographic data, topographic data (two-dimensional and three-dimensional terrain data), as well as with the radio business is closely related to the geophysical characteristics of data (such as conductivity, dielectric coefficient, rainfall data etc.), atmospheric properties data, human data (such as building density, population statistics) and so on. 6, the monitoring database. Both for analysis and monitoring database to find all kinds of radio interference of radio transmitters to provide a \But also the frequency for the scientific and rational planning, allocation or assignment and the frequency EMC analysis of station management to provide analytical and statistical data of radio monitoring. Monitoring database should include the monitoring station name, station site, monitoring References: date, monitoring, asked a frequency / frequency band or spectrum of signal field strength, frequency, degree of occupation statistics, emission type, system type, the measured radio station name / call sign, showing dimensions, station type, nature of business and other fields. Fourth, the Air Force spectrum management model for EMC analysis of wave propagation analysis in order to facilitate computer calculation of EMC, in addition to the appropriate underlying database must be established, but is also necessary to use modeling techniques, through theoretical analysis, empirical formula, statistical analysis, the establishment of various radio-frequency systems with engineering models and computer simulation models. Radio propagation model and the selection of the correctness of the scientific and the necessary amendments and good algorithm design, EMC analysis directly related to the calculation of the efficiency and reliability of prediction. Air Force spectrum management in radio wave propagation model is mainly used to calculate the propagation loss, antenna coverage and determine the extent of interference. General There are seven radio propagation model form, that is, waveguide, ground wave,[link widoczny dla zalogowanych], sky wave, space wave (a direct wave and ground reflected wave), diffraction, tropospheric scatter and line of sight communication (point to point or ground to the satellite.) Air Force spectrum management in the EMC analysis of model selection should be based on the actual working frequency and geographical decision. ITU recommended VHF and UHF frequency bands commonly used in the proposal are: ① the free-space propagation model based on ITU-RP. 525-2; ② data base based on rough terrain I,[link widoczny dla zalogowanych], I'U-RP. 370-7, and P. 529-3,[link widoczny dla zalogowanych], etc.; ③ detailed terrain data based on ITU-RP. 526-8, and P. 452-11, etc.; ④ empirical formula based on Okumura-Hata model; ⑤ statistics-based Longley / Rice model; ⑥ ionospheric propagation, ultra-refraction and transmission. V. Conclusion battlefield complex electromagnetic environment of the battlefield is the work of electronic information systems major factor, but also determine the outcome of high-tech electromagnetic spectrum, a key factor in the struggle to adapt to the new situation and new tasks under the high-tech electronic warfare, requires the establishment of the Air Force radio frequency spectrum management system, we must fully consider the electromagnetic compatibility analysis system and its application to spectrum management, which is winning the war under the conditions of future information requirements and development trends of the inevitable choice. [1] Liao Xiaoguang. Introduction to military radio management [M]. Beijing: PLA Publishing House, 2003. [2] National Spectrum Monitoring Handbook [S]. [3] Li Lu. HF frequency management technique [J]. Ship Electronic Engineering, 2003 (5) :53-56

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