With the rapid development of the vehicle navigation system (VNS), the functions of VNS are improved, while the design becomes very complicated. The conventional field-circuit simulation method is not precise enough to evaluate the VNS design. It is difficult to ensure that the electromagnetic compatibility index of VNS meets the GMW 3097 standard, resulting in electromagnetic interference (EMI) testing in an absorber lined shielded enclosure (ALSE). If the VNS does not comply with the GMW 3097 standard, it needs to be debugged repeatedly in the expensive ALSE. Therefore, a more accurate simulation method is highly desired, which can be used for improving the designed system to avoid using the expensive ALSE solution. In this study, an advanced field-circuit simulation method utilising actual parameters of the working printed circuit board is proposed to improve the simulation accuracy. The system is debugged by the proposed simulation method. Meanwhile, the optimisation method is proposed to enhance the EMI performance. Finally, by suppressing noise on the transmission path, the emission level of the VNS at 1.6 GHz is reduced from 5.9 dBμV to below−4 dBμV, which is ∼8 dBμV lower than the GMW 3097 standard.

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Field-circuit simulation of electromagnetic interference and optimisation design in vehicle navigation system

References

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