车载通信系统电磁干扰余量评估

doi:10.16180/j.cnki.issn1007-7820.2022.04.001

摘要/Abstract

摘要：

随着科学技术的发展,车载通信系统面临的电磁干扰问题愈加突出。针对车载通信系统的干扰余量评估问题,基于四级筛选法,文中提出了一种新颖的车载通信系统电磁干扰余量评估方法。依次对车载接收机的工作条件、工作频率、信号功率和通信性能进行评估,以定量表述车载接收机的干扰余量及受扰情况。针对干扰源对接收机灵敏度的影响,该方法选取了通信距离、信噪比、误码率等3个指标对车载通信系统的性能进行评估。结果表明,与传统四级筛选法相比,文中所提方法能够较为全面地体现通信系统受扰后通信性能的变化情况。

关键词: 电磁干扰, 车载通信系统, 干扰余量, 通信性能, 接收机灵敏度, 通信距离, 信噪比, 误码率

Abstract:

With the development of science and technology, the electromagnetic interference in the vehicular communication system becomes more and more obvious. In view of the interference margin assessment of the vehicular communication system, this study proposes a novel evaluation method of electromagnetic interference margin of the vehicular communication system based on four-level screening method. The working conditions, frequency, signal power and communication performance of the vehicular receiver are evaluated respectively to display the disturbed situation and interference margin of the vehicular receiver quantitatively. Aiming at the influence of interference source on receiver sensitivity, the communication distance, signal-to-noise ratio and bit error rate are selected to evaluate the performance of vehicular communication system by this method. The results show that compared with the traditional four-level screening method, this method can more comprehensively reflect the performance changes of communication system with interference.

Key words: electromagnetic interference, vehicular communication system, interference margin, communication performance, receiver sensitivity, communication distance, SNR, BER

中图分类号:

TN97

万健鹏,路宏敏,刘国华,李敏. 车载通信系统电磁干扰余量评估[J]. 电子科技, 2022, 35(4): 1-7.

Jianpeng WAN,Hongmin LU,Guohua LIU,Min LI. EMI Margin Assessment of Vehicular Communication System[J]. Electronic Science and Technology, 2022, 35(4): 1-7.

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工作频率/MHz	a/dB	b/dB	标准偏差/dB
<30	-70	-20	10
30~300	-80	-30	15
>300	-60	-40	20

车载通信设备	工作频率 /MHz	带宽 /MHz	灵敏度/dBm	功率 /W
VHF1(发)	33	2	-	30
VHF2(收)	33	2	-116	-
HF3(发)	11	2	-	30
VHF4(发)	65	2	-	30

	传统方法	本文方法
干扰余量	RIM 10.7 dB SIM -90.4 dB	10.7 dB
兼容情况	受到干扰信噪比为7.2 dB	通信距离减小了45.6%,信噪比为7.2 dB,受扰后的误码率为6.1×10^-3
适用性	模拟系统	模拟系统、数字系统