Interface Threat Analysis and Current Injection Testing for Direct Drive SGEMP in Multiwire Cables

In this paper we present: (1) the results of an extensive analytical and computational evaluation of the response of termination loads to cable SGEMP signals driven in multiwire cable bundles, and (2) the design, development and experimental verification results of a Multipin Current Injection Test (C.I.T.) Method for performing SGEMP hardness verification tests on electronic component boxes. These tests are imposed by satellite system survivability specifications which require that an SGEMP C.I.T. be performed on each Qualification Level Component Box to demonstrate SGEMP hardness verification. This C.I.T. method was developed to meet the technology needs for a user-oriented current injection technique using realistic hardware to correctly perform these SGEMP electrical simulation tests at the individual component box level as well as at the subsystem and system levels. The purpose of the analytical development work was to quantify the dependence of the termination response on the manifold of parameters which specify the cable SGEMP threat in multiwire cables. This quantification is essential for making a rational choice of the drive levels, coupling factors, and cable characteristic impedances to be chosen in the implementation of this test technique in order to perform a meaningful SGEMP C.I.T. at realistic maximum threat conditions.