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车载电子设备应用日益广泛,对整车电磁环境也提出越来越苛刻的要求,严格限定车载电子设备的空间辐射是保证道路行驶安全的必要措施。本文介绍了某车载收音机的空间辐射测试超标问题实例,对其实验数据进行频谱分析,结合系统架构,确定辐射源。之后,通过对辐射源数字电路进行设计改进,加入芯片去耦电容和输出信号线的滤波电容,优化PCB设计,最终使该产品的空间辐射通过验证标准,并由此提出了空间辐射超标频谱分析法的步骤。
The application of vehicle-mounted electronic equipment is becoming more and more widespread. More and more stringent requirements are imposed on the electromagnetic environment of the vehicle. It is necessary to strictly limit the space radiation of vehicle-mounted electronic equipment to ensure the safety of the road. In this paper, an example of over-standard space radiation test of a car radio is introduced. The spectrum of the experimental data is analyzed, and the radiation source is determined according to the system architecture. Afterwards, the design of the digital circuit of the radiation source was improved, the decoupling capacitor of the chip and the filter capacitor of the output signal line were added, the PCB design was optimized, and finally the space radiation of the product passed the verification standard, and thus the spatial radiation exceeding standard spectrum analysis Steps of the law.