Aiming at the serious electromagnetic interference of the electric propulsion system, which has large cubage, high power and complexing structure, a novel electromagnetic interference virtual chamber measurement technique is presented in the paper. At first, several sensors are applied to measure the electromagnetic interference of ship electric propulsion synchronously, it solve the problem of time delay for one sensor distribuly measuring. Then, the synchronous time and frequency technique is designed to assure the measurement signal from different sensors have synchronous time and frequency. Anew multichannel blind source separation algorithm is proposed based on independent component analysis. The algorithm separates the signal of every sensor based on the statistic distribution of source signal. At last, the simulation and experiment proves that the technique acquire the electromagnetic environment of ship electric propulsion system, and give the main interference source. Therefore, the technique has important engineering application value.%针对船舶电力推进系统体积大,功率高,结构复杂,电磁干扰严重等特点,提出了一种船舶电力推进系统电磁干扰虚拟暗室测试技术.首先设计了多传感器同步测试电力推进系统的电磁干扰,克服单传感器分布测试时带来的时间差问题,并提出了时频同步技术保证多传感器测试的信号时间与频率同步,从而提高测试精度和应用范围.然后设计了基于独立分量分析的多通道盲源分离算法,利用源信号近似的统计分布先验知识分离出每个传感器的信号.最后建立了虚拟暗室测试系统进行试验验证,计算机仿真以及试验结果证明该技术准确而快速地测试出了电力推进系统的电磁环境,确定了电力推进系统的主要干扰源,保证电力推进系统的电磁兼容性,具有重要的工程应用价值.
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