# Shielding Grounding Optimization Method for Spaceborne Multi-Cable
## 2 Shielding Grounding Optimization Method
### Related Work  
The method proposed in this paper is compared with the related work in the following three aspects. Computational and modeling complexity: The transfer impedance of the shield is an important parameter for measuring the shielding effect. Since [PERSON] proposed the metal braided transfer impedance model, many researchers have improved the model [18]. [PERSON] et al. established an effective analytical model for the transfer impedance of non-coaxial braided shielded cables with holes using complex analysis and conformal mapping  
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and [PERSON]'s formula [19]. [PERSON] et al. further proposed a transfer impedance formula for a two-layer cable shield [20]. In these studies, the shielding effect was described by the complex electromagnetic field analytical formula. However, the coupling between multiple cables in an actual satellite-borne electronics system is difficult to express using the electromagnetic field analytical formula. The method proposed in this paper directly simulates the interference voltage of the inner core of the cable through CST modeling, and grades the results, so the measurement of the shielding effect is more intuitive and convenient, avoiding the complicated and lengthy formula derivation. In addition, this paper also proposes an innovative parameter extremization method, which polarizes the grounding resistance of the shield, to simulate two states of grounding and ungrounding of the shield. This greatly facilitates the CST parameter scanning simulation process. Processing of results: The truth table helps one to judge the truth value intuitively and quickly, and has been applied in many fields. For example, in the field of automatic logical reasoning, [PERSON] et al. proposed a new conceptual reasoning method for inference engines based on closure and join operators on binary relation truth tables [21]. In the field of programming algorithm development, [PERSON] et al. developed a new algorithm that converts the truth table of Boolean functions under any input permutation into a canonical form for Boolean matching containing a large number of inputs and implicit content [22]. In the field of fault prediction, [PERSON] et al. used truth table modeling to estimate the reliability, failure rate, and meantime without failure of an uninterruptible power supply system by considering all the possible state combinations of the main components of the uninterruptible power supply [23]. In this study, the truth table was applied to the electromagnetic compatibility field for the first time. The different shield ground states and corresponding shielding effects were sorted and summarized by the truth table. In addition, to overcome the shortcoming of the truth table that it takes too long to summarize the rules, this paper further proposes using the truth table to generate logical expressions to describe the mapping relationship between the shield ground state and masking effect, to summarize the rules and guide the subsequent shield grounding. The shortcoming of this method is that it only considers the influence between cables, and does not consider the influence of other devices in the system, such as circuit boards and connectors. However, these factors have been studied by many other researchers. [PERSON] et al. modeled the radiation emission caused by the power bus noise of circuit boards with cables and applied it to various circuit board-cable connection structures [24]. [PERSON] [25] and [PERSON] et al. [26] indicated that the common-mode current induced on a cable connected  
Figure 5: The logic conversion module of Multisim (XLC). to the circuit board may be an important source of accidental radiation. [PERSON] et al. [27] pointed out that the degradation of electrical connectors would reduce communication quality. [PERSON] et al. [28] pointed out that degradation of the contact surface of high-speed connectors would disrupt the signal integrity of high-speed interconnect channels.