A Novel Transfer Function Model Based on the Feature Selection Validation Method for Quadrotor Unmanned Aerial Vehicles in High-Intensity Radiated Field Environments
Round 1
Reviewer 1 Report
Comments and Suggestions for AuthorsThe paper provides valuable insights into UAV safety in HIRF environments. Consider elaborating on key findings and practical implications for airworthiness standards to enhance the paper's impact. Please find the comments below,
1. Consider adding a comparison table with the state-of-the-art methods to clearly highlight the differences, advantages, and limitations. This will help readers better understand how the proposed approach stands out.
2. How were the material parameters modeled in the simulation, and how do they correlate to real-world performance?
3. Why is E-field strength prioritized over current in the HIRF transfer function analysis?
4. What criteria were used to select the observation points in the battery compartment for the analysis?
5. What mitigation strategies are suggested to address the failure modes induced by electromagnetic interference in UAVs?
6. What specific design factors contribute to the variation in E-Field strength for different incident directions (side, top, and bottom)?
7. Why is there no significant relationship between external excitation conditions and internal E-Field strength observed in the 100 MHz to 1 GHz frequency range?
Author Response
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Reviewer 2 Report
Comments and Suggestions for AuthorsThe study addresses an issue relevant to today's saturated UAV airspace - the impact of electromagnetic interference on aircraft. A simulation model of a popular commercial drone is constructed, the frequency characteristics of the simulation model and the experimental research are presented, and a transfer function is constructed based on them. Although the simulation and experimental results are close, a more detailed analysis of their practical usefulness is lacking. The formula for the resonant frequency is too simplistic and does not reflect the actual parameters of the module under consideration, conditioned by the components installed there. Even the motors and their connecting wires have not been evaluated. The resonant frequency of 5,31 GHz listed in the results charts is sufficiently not clear and the sharp peaks at 1.85 GHz (2 GHz in the experiment) are not sufficiently explained. The impact of these frequency signals on the drone's performance, especially on its sensitive positioning and communication systems, and the placement of the antennas are also not fully considered. It would also be interesting to see how the presented transfer function would change for a drone with different dimensions.
There are also several citation errors in the paper: the references mentioned in lines 87 and 90 do not correspond to the list, and the source mentioned in line 93 is defined as [33], whereas in the list is [30].
Author Response
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Reviewer 3 Report
Comments and Suggestions for AuthorsThe article submitted for review deals with current issues and is enjoyable. From the point of view of the concept, I have no reservations. However, I have reservations about the professional content of the article; please find my comments below. After studying the article, it is necessary to adjust and supplement specific facts for the sake of the integrity of the information provided and also to define the professional level of the article. The article's title should not contain abbreviations that are not generally known and commonly used.
1. Table 1: The data given in the table are unclear and confusing: What does "dimensional parameter" mean, and then what does "specification" mean—probably given in meters/? For example, in the "wheelbase" case, what does this parameter define? Length? WIDTH? Diameter? The table needs to be revised to provide exclusively clear information.
2. The title of Table 2 is misleading: the term "medium" is understood to have a different meaning. It is necessary to change the name of the table, for example, material structure parameters. Moreover, the table incorrectly states that Copper has no defined relative permittivity. It certainly does, but its value will be very low. However, it is impossible not to state data as if it did not exist. The same applies to the conductivity of PC and PVC. Moreover, I recommend that authors in the future use the usual symbols for designating generally known quantities /epsilon, gamma, tangent delta/.
3. During the implementation of simulations/experiments, it is necessary to clearly define what the authors mean when they evaluate the E-field. It is necessary to clearly define /using an equation/ how the given value was calculated: whether it is a module of three coordinate components or what value it is. This must be included in the article without fail.
4. The title of Figure 7 needs to be expanded because it is too abstract; it needs to be related to what the reader is supposed to see in it. In this case, attention is drawn only to ventilation holes...but why? It is necessary to add their possible effect directly to the caption of the figure.
5. The title of Figures 8 and 9 need to be changed. It is not a "schema" but, for example, a "spatial arrangement" or a similar expression. The type of measuring antenna is not completely visible from the figure. Although it is stated that it is a SinnoRally®Electric field probe type, I could not find a datasheet for the given probe. Its frequency range is extremely wide, which is unusual for such a /size/ probe. Was the probe calibrated? It is necessary to add information to the article regarding its calibration in such a wide frequency band. The point is to increase the credibility of the measurement results, reduce the impact of measurement uncertainty, etc. Please add it to the text.
6. Figure 11: It is necessary to add directly to the caption of the figure what the individual abbreviations given for the individual bar graphs mean. At the same time, it is necessary to add information about what quantity is plotted on the vertical axis.
7. In chapter 4 of the article, I strongly disagree that the resulting transfer function /Figure 14/ is determined in the form of 5 points interconnected by a linear relationship. How do you know that this relationship is truly linear between neighbouring points? Please use either a trend line or cubic splines. It is not permissible to define such a relationship in this way.
8. In the "conclusion" section, the findings should be presented to the reader briefly and clearly. There is too much information in this chapter, and it does not follow a logical sequence. Please reformulate this section by focusing on presenting the "highlights" of this article briefly and clearly.
Author Response
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Reviewer 4 Report
Comments and Suggestions for AuthorsThis paper developed a novel transfer function model based on FSV method for quadrotor UAVs in high-intensity radiated field environment. Overall, this manuscript is a minor extension in the field, and the reviewer suggests the following revisions to improve the manuscript's quality.
1. Some English sentences written in the manuscript are unclear enough, have errors (e.g., used tense, etc.); thus, the reviewer recommend that the author must carefully revise those in the manuscript again.
2. The introduction should be revised to make it clear that the scientific problems the work aimed at overcoming or the limitations existed. In this case, scientific problem could be summarized and make the contribution more clearly. How does the proposed transfer function model contribute to understanding UAV susceptibility to electromagnetic interference? Some references are useful to revise introduction: 1. Comparing open area test site and resonant chamber for unmanned aerial vehicle's high-intensity radiated field testing; 2. Smart Aggregate‐Based Concrete Stress Monitoring via 1D CNN Deep Learning of Raw Impedance Signals;
3. What frequency range does the proposed transfer function model analyze the UAVs' electromagnetic behavior?
4. Besides summarizing the completed work and achievements, the authors should discuss more about their limitations/drawbacks of proposed method, should include suggestions for future studies aimed at addressing these limitations, and provide insight into the potential directions for further developments in this research.
Comments for author File: Comments.pdf
The english can be improved
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Round 2
Reviewer 1 Report
Comments and Suggestions for AuthorsThank you for addressing the questions. I have no further comments.
Author Response
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Reviewer 2 Report
Comments and Suggestions for AuthorsThanks to the authors for their detailed replies to the reviewers' questions and for the corrections made. In any case, I hope that the authors will go beyond this study and analyse in more detail the impact of electromagnetic interference on real-life UAVs. Recommendations on reducing interference in the 1.575 and 2.4 GHz bands, as well as including signals with circular polarisation in the tests, would be a relevant result.
Author Response
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Reviewer 3 Report
Comments and Suggestions for AuthorsThe authors provided an article for the review process in the second round, in which they were invited to incorporate the comments raised by the review opinion. After studying the article, I conclude that this is a significant increase in the quality of the aforementioned contribution. The authors have indeed incorporated the comments raised, which has increased the professional level of the contribution, its attractiveness for the reader, and, last but not least, the dissemination of the results to the general professional public can be expected.
Author Response
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