A Study Of The Probability Of The Interferencebetween Vehicle Communication Radios

With the development of modern communication technology, the increasing number of the electronic facility especially the wireless correspondence stations equipped in vehicle communication system leads to the interference between radio stations becoming more and more serious. Based on such a grim situation, the problem how to guarantee the frequency and equipment scale applied in the system design via estimating and forecasting the degree of interference between the radio stations in vehicle communication apparatus urgently needs to be addressed.In view of solving problems above and requirements in the research of Electromagnetic Compatibility(EMC) in vehicle communication system, we establish a calculation model on the probability of interference between radio stations under the guidance of the performance characteristics and principle of the communication system between transmitter and receivers.Firstly, we analyze and summarize colocation communication system and inter-communication system among multi-vehicle on the basis of the existing study of electromagnetic interference between vehicle communication stations, and propose the conception of equivalent interference bandwidth which provides the method of calculating the probability of interference between stations due to the method of computing the interference bandwidth based on SINAD model. With the analysis of the characteristics of adjacent channel interference and harmonic interference between stations, different types of model are established, one of which is adjacent channel interference probability model for the case of different frequency bands interference and the other is harmonic interference probability model for the situation of the same frequency bands interference.Then from the perspective of mathematical calculations, establishing comprehensive interference probability model is necessary depending on the analysis of the links between adjacent channel and harmonic and the consideration of the effect of two types of interference. Under the hypothesis that the working state of each station whoseoperating frequency is equal to each other are independent of each other, we establish several-for-one comprehensive interference probability model after extending the calculation method of one-to-one comprehensive interference probability to many-to-one comprehensive interference probability. On this basis above, our research takes simulation analysis on the interference between HF radio and VHF radio for example.Finally, based on the above analysis, we prepare some modules of the software in regard to the prediction analysis about interference probability between vehicle communicating stations and introduce the programing and application of the software.