Assessment Technique On The Frequency Assignment Compatibility Of The Vehicle Communication System

The various electronic equipments uploaded on vehicle communication systemwith frequency assignment unreasonable will lead to poor system compatibility, andaffect the normal work of the communication system. Therefore, it is of greatsignificance and engineering value to build the frequency assignment compatibilityassessment of the vehicle communication system.In this paper，focusing on the electromagnetic interference characteristics of thevehicle communication system. Firstly, the co-site interference among the top antennasuploaded on the platform of communication vehicle and the wave transmission losses ofand cluster communication system which locate in four types of typical environmentsuch as plain, jungle, mountain, and hill are analyzed. And the electromagneticinterference calculation model of the vehicle communication system is built also. Thensingle-link interference assessment algorithm consisted of set-band prediction,frequency point prediction, analysis of several common types of interference (adj acentfrequency, harmonic, IF, image frequency and inter-modulation, etc.) and interferenceassessment is used to assess the system of single communication link. Based on this, themulti-link interference assessment algorithm based on the evaluation theory of the idealpoint is used to assess the vehicle communication system frequency assignmentcompatibility assessment; Finally，the Oracle data storage tool is applied to design thebasic database in the vehicle communication system, and then the overall structure ofsoftware is built. The data interface of software is designed and the vehiclecommunication system frequency assignment compatibility evaluation software isfinished, which offers the engineering evidence for judging the rationality of the vehiclecommunication system frequency assignment.