## 5 Electromagnetic Environmental Effects Evaluation System  
The effects evaluation system of the electromagnetic environment takes significant effort after constructing the evaluation model; it supplements the evaluation study. Besides a significant reduction in the calculation, the accuracy is also improved. With the development of the effects evaluation system of the electromagnetic environment, the effects assessment research is more useful for engineering applications.  
In 1968, [PERSON] and [PERSON] first proposed a computer-aided analysis method to solve electromagnetic compatibility problems. In the 1970s and 1980s, the United States and Russia developed EMI prediction software to meet different engineering demands [83]. IEMCAP (In-system Electromagnetic Compatibility Analysis Program) and  
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SEMCAP (Inter-system Electromagnetic Compatibility Analysis Program) are the earliest prototypes [84; 85] of electromagnetic compatibility prediction programs developed in the United States, respectively. After that, the ROM Aeronautical Development Center of the United States developed IPP-1 (Interference Prediction Program One) software for radar systems. Subsequently, the MSC Corporation of the United States developed ARIES software for 3D solid modeling, EMAS software for EMI/EMC analysis, and UWAVELAB software for high-frequency electromagnetic analysis [86; 87]. The Boeing Company in the United States also has its own electromagnetic compatibility prediction software but has not launched it due to confidentiality.  
In China, the Beijing University of Aeronautics and Astronautics first developed EMC prediction software for aircraft EMC prediction in the 1990s. [PERSON] [88] studied the prediction of electromagnetic compatibility between radio systems. He also developed software for electromagnetic compatibility prediction, analysis, and simulation between systems. Based on the testing data, [PERSON] et al. [89] comprehensively used the fitting model and prediction algorithm to predict the electromagnetic compatibility between the communication systems and implemented the software with.NET. [PERSON] et al. [90] adopted electromagnetic topology and power balance methods to evaluate the high-frequency response of the cavity, and they developed software for simple simulation. [PERSON] et al. [91] built a model of significant electromagnetic parameters with testing data that could predict the variation of the electromagnetic environment in a specific region; a simple electromagnetic environment analysis software was also developed. [PERSON] et al. [92] developed software to analyze and predict complex electromagnetic environments. [PERSON] et al. [93] developed electromagnetic environment adaptability assessment software for frequency equipment according to the theoretical radiation effect model of communication equipment and the effect testing data of communication equipment. [PERSON] et al. [94] analyzed the impact of a spacecraft's electric propulsion plumes on a satellite's electromagnetic environment. Besides this analysis, they developed electromagnetic effect simulation software to provide a reference for reducing the effects evaluation cost of space systems.  
In summary, there is not much research on the actual electromagnetic environmental effects evaluation system. The current electromagnetic environmental effects evaluation software is mainly for simulation, and the software used for prediction is more limited to a single source and frequency of interference. The related software does not involve the correlation between multiple sources and frequencies of interference. Hence, the application of this kind of software in a complex electromagnetic environment faces a big challenge.