Abstract
The maximum electromagnetic coupling is directly related to the polarization angle of the incident field in the highaltitude electromagnetic pulse (HEMP) illumination test. Aimed at the linear system, this letter analyzed the test error of the maximum coupling corresponding to the change of the angel between the polarization direction and the direction of the equipment under test (EUT) in EMP illumination tests. Characterized by EM norm, quantization estimation formula of the maximum coupling test error under illuminations with EUT Rotations is deduced. The results show that the maximum measurement accuracy is the cosine of 1/2 of the maximum rotation angle of the EUTs. At last, a test scheme of 5 illuminations (with rotations of the EUT and the rotation angle of each rotation is 36∘) with 95% test accuracy of the maximum coupling of the method itself is recommended in this paper. The results can provide support for the design and evaluation of EM illumination test.
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