## 3 Description of the General EMC Topological Model  
### General Scenario  
A practical application of the described EMC topological model is presented in the general scenario illustrated in Figure 2, where the ship's structure consists of four shielding planes \(S_{1-4}\) and the given EuT is located in a cabin (shielding plane \(S_{4}\)). Four internal disturbing signals, five external disturbing signals, and seven extraneous external disturbing signals radiate from their sources \(D_{m=1+4}^{(i)},\ D_{j=1+5}^{(o)}\), and \(D_{k=1+7}^{(e)}\), and have an influence on the operation of the EuT.  
These disturbing signals can be characterized as follows.  
* Firstly, the ship's own internal disturbance sources are:
* \(D_{1}^{(i)}\), the ship's power station, which radiates the disturbing signal \(E_{1}^{(i)}\), propagating to the EuT via shielding planes \(S_{3}\) and \(S_{4}\);
* \(D_{2}^{(i)}\), the ship's power system, which radiates the disturbing signal \(E_{2}^{(i)}\), propagating to the EuT via shielding planes \(S_{3}\) and \(S_{4}\);  
Figure 2: The general scenario of the disturbance source locations.  
\(D_{3}^{(i)}\), the ship's passive defense system, which radiates the disturbing signal \(E_{3}^{(i)}\), propagating to the EuT also via shielding planes \(S_{3}\) and \(S_{4}\); \(D_{4}^{(i)}\), the ship's radio station, which radiates the disturbing signal \(E_{4}^{(i)}\), propagating to the EuT only via shielding plane \(S_{4}\).
* Secondly, the ship's own external disturbance sources are:
* \(D_{1}^{(o)}\), the ship's navigation radar antenna, which radiates the disturbing signal \(E_{1}^{(o)}\), propagating to the EuT via all shielding planes;
* \(D_{2}^{(o)}\), the ship's combat radar antenna, which radiates the disturbing signal \(E_{2}^{(o)}\), propagating to the EuT via all shielding planes;
* \(D_{3}^{(o)}\), the ship's high-frequency (HF) radio station transmitting antenna, which radiates the disturbing signal \(E_{3}^{(o)}\), propagating to the EuT via all shielding planes;
* \(D_{4}^{(o)}\), the ship's active defense system, which radiates the disturbing signal \(E_{4}^{(o)}\), propagating to the EuT via shielding planes \(S_{2},S_{3}\), and \(S_{4}\); and
* \(D_{5}^{(o)}\), the ship's helicopter, which radiates the disturbance signal \(E_{5}^{(o)}\), propagating to the EuT also via shielding planes \(S_{2},S_{3}\), and \(S_{4}\).
* Thirdly, the extraneous disturbance sources are:
* \(D_{1}^{(e)}\), the transmitting antenna of the combat radar equipment for the first extraneous ship, which radiates the disturbing signal \(E_{1}^{(e)}\), propagating to the EuT via all shielding planes;
* \(D_{2}^{(e)}\), the navigation radar antenna of the first extraneous ship, which radiates the disturbing signal \(E_{2}^{(e)}\), propagating to the EuT via all shielding planes;
* \(D_{3}^{(e)}\), the transmitting antenna of the very-high-frequency (VHF) radio station of the first extraneous ship, which radiates the disturbing signal \(E_{3}^{(e)}\), propagating to the EuT via all shielding planes;
* \(D_{4}^{(e)}\), the transmitting antenna of the ultra-high-frequency (UHF)/VHF station of the first extraneous combat aircraft, which radiates the disturbing signal \(E_{4}^{(e)}\), propagating to the EuT via all shielding planes;
* \(D_{5}^{(e)}\), the navigation radar antenna of the second extraneous ship, which radiates the disturbing signal \(E_{5}^{(e)}\), propagating to the EuT via all shielding planes;
* \(D_{6}^{(e)}\), the transmitting antenna of the navigation radar equipment of the second extraneous ship, which radiates the disturbing signal \(E_{6}^{(e)}\), propagating to the EuT via all shielding planes;
* \(D_{7}^{(e)}\), the transmitting antenna of the navigation radar equipment of the second extraneous combat aircraft, which radiates the disturbing signal \(E_{7}^{(e)}\), propagating to the EuT via all shielding planes.  
The method for preparing the contents of the matrices and vectors in Equation (6), Equation (13), and Equation (14) for the scenario shown in Figure 2 is presented in Section 3.2.