| Radar System and Vehicular Short-wave Communication System are widely used as important methods for collecting and gaining intelligence in electronic and informational warfare. With increasing transmitted powers as well as more crowdedness in frequency spectrums, the issue of Electromagnetic Compatibility(EMC) of Radar System and Vehicular Short-wave Communication System is drawing more attentions. There are many domestic and foreign research on the issue of the Co-Channel Interference from the Radar System to the Communication System. Most of them are the issues in the micro-wave region, however the there is few research on the same issue in the short-ware region or in the case of different frequency bands.This thesis developed from the discussion of the jamming mechanism from Radar System to Communication System, modeled the coupling in conditions of same frequency interference and different frequency interference on the Radar System to Vehicular Short-wave Communication System. Based on the investigation of the research, the disturbance variables which are coupled into the Communication System could be calculated precisely for the study of its disturbance level.Firstly, the thesis analyzed the jamming mechanism from Radar System to Vehicular Short-wave Communication System by learning the structure of the shortwave communication system receiver. Based on the analysis of the different types of Radar Systems, sky-wave radar system in short-wave and paraboloidal antenna radar system in micro-wave were selected to be the interference resources for the same frequency interference and the different frequency interference purposes, respectively. Models of the coupling in conditions of same frequency interference and different frequency interference on the Radar System to Vehicular Short-wave Communication System were then established.Secondly, the gain of the transmitting antenna of the sky-wave radar system was derived analytically by the image theory and pattern multiplication principles; and the gain of gain of the transmitting antenna of the paraboloidal antenna radar system was derived analytically by the Huyghens principle. The results were tested by simulations.Thirdly, the parameters of the receiver antenna of the Vehicular Short-wave Communication System were studied in cases of different frequencies. This determined the method of calculating the gain aswell as the reflectance of the Vehicular Short-wave Communication System when receive the microwave band electromagnetic waves.Further, the matches of the sending and receiving antenna polarization and impedance, as well as the ionospheric propagation of the electromagnetic wave were studied to fix the Fries Transmission Formula to calculate the coupled disturbance variable of the Vehicular Short-wave Communication System receiver. Also, the SINAD calculation method was proposed to analyze the issue of same frequency interference from the Radar System to Vehicular Short-wave Communication System and the method of comparison of The amount of interference and receiver damage threshold was proposed to analyze the issue of different frequency interference from the Radar Systems to Vehicular Short-wave Communication System.Finally, object-oriented programming ideas were used in this thesis to design the softwares of EMC analysis from Radar System to Vehicular Short-wave Communication System. The diffset was given based on the data which implemented the EMC analysis from Radar System to Vehicular Short-wave Communication System. |
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