Utilizing Dynamic Scattering for Learning Radar Cross-Section of a Flapping-Wing Aircraft
Round 1
Reviewer 1 Report
(1) In "Introduction", it is mentioned that "there are few studies on the stealth performance of flapping wing". But many references on this are given in "Introduction". What is the difference between the research in this paper and the references.
(2) I do not think the numerical method presented in this paper is brand new. The novelty need to be clearly addressed.
(3) Is the flapping-wing aircraft treated as pure conductor? If yes, the conclusions might not be applicable to the actrual case.
Author Response
Dear Editors and Reviewers:
Thank you for your letter and for the reviewers’ comments concerning our manuscript entitled “Utilizing dynamic scattering for learning radar cross-section of a flapping-wing aircraft” (ID: photonics-1965181). Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our researches. We have studied comments carefully and have made correction which we hope meet with approval. Revised portion are marked in red in the paper. The main corrections in the paper and the responds to the reviewer’s comments are as flowing:
Responds to the reviewer’s comments:
Reviewer #1:
- In "Introduction", it is mentioned that "there are few studies on the stealth performance of flapping wing". But many references on this are given in "Introduction". What is the difference between the research in this paper and the references.
Response:
As suggested by the reviewer, the literatures discussed in the introduction do have many researches on flapping wing aircraft, while most of them focus on lift characteristics, flow field simulation, thrust mechanism and wing structure. This paper mainly studies the electromagnetic scattering characteristics of flapping wing aircraft.
- I do not think the numerical method presented in this paper is brand new. The novelty need to be clearly addressed.
Response:
As commented, the calculation method in this paper is a unique algorithm written for the flapping model of a single wing, which is reflected in the new wing (single segment) in Appendix A. If the two-stage wing needs to be studied, new algorithms need to be developed. Therefore, the author thinks that innovation is enough, which also shows that we have the ability to study the electromagnetic scattering characteristics of the flapping of the multi-element wing.
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- Is the flapping-wing aircraft treated as pure conductor? If yes, the conclusions might not be applicable to the actrual case.
Response:
As mentioned in the literature, the surface properties and internal structure of the target are allowed to have differences.
Fuselage keel, frame, wing beam and other components can be made of alloy, composite materials or special plastics, while small elastic wing surface skin can be made of nylon cloth and plastics, and large wing skin can be made of aluminum magnesium alloy, titanium alloy or composite materials. The flapping wing aircraft in this paper is large in size, thus the surface is considered as an ideal conductor. This method is also conducive to the coating of radar absorbing materials on the skin.
Special thanks to this reviewer for his suggestions. Your comments make this article more professional and rigorous. Thanks again!
We tried our best to improve the manuscript and made some changes in the manuscript. These changes will not influence the content and framework of the paper. And here we did not list the changes but marked in red in revised paper.
We appreciate for Editors/Reviewers’ warm work earnestly, and hope that the correction will meet with approval.
Once again, thank you very much for your comments and suggestions.
Yours sincerely,
Zeyang Zhou, Jun Huang
Reviewer 2 Report
The authors have used a simplified model, i.e. PO to calculate the RCS. To do so, they have divided the scattering object into lit and dark regions. It is not clear to me how this division is done. Further, it is not possible to exactly divide into only two regions, ignoring PTD. May be the authors are looking for a simple solution and using a more complex model is beyond their reach.
Hence, all the conclusions reached by the authors are good only to the first order and may be sufficient in this case. Their conclusion that increasing the radar frequency drastically modifies the RCS is well known.
Author Response
Dear Editors and Reviewers:
Thank you for your letter and for the reviewers’ comments concerning our manuscript entitled “Utilizing dynamic scattering for learning radar cross-section of a flapping-wing aircraft” (ID: photonics-1965181). Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our researches. We have studied comments carefully and have made correction which we hope meet with approval. Revised portion are marked in red in the paper. The main corrections in the paper and the responds to the reviewer’s comments are as flowing:
Responds to the reviewer’s comments:
Reviewer #2:
- The authors have used a simplified model, i.e. PO to calculate the RCS. To do so, they have divided the scattering object into lit and dark regions. It is not clear to me how this division is done. Further, it is not possible to exactly divide into only two regions, ignoring PTD. May be the authors are looking for a simple solution and using a more complex model is beyond their reach.
Response:
As suggested, for different targets and observation conditions, appropriate calculation methods need to be adopted. We have computational methods including but not limited to geometric optics, PO, method of moment, iterative techniques of physical optics, and edge diffraction includes geometric diffraction and physical diffraction, etc.
For targets with simple shape and specific incident conditions, we often use PO+PTD for analysis, and supplement relevant multiple scattering results as needed (as shown in Appendix A).
- Hence, all the conclusions reached by the authors are good only to the first order and may be sufficient in this case. Their conclusion that increasing the radar frequency drastically modifies the RCS is well known.
Response:
According to the reviewer’s suggestion, we supplemented the relevant data and improved the conclusion. The RCS of aircraft with different shapes of single section wing is analyzed, which is the basis for the study of multi section wing and elastic wing. The influence of different wings on the peak size and position is small, but the dynamic fluctuation can be large.
Special thanks to the reviewer for his/her comments and suggestions. Your suggestions make the presentation of this article more understandable. Thanks again!
We tried our best to improve the manuscript and made some changes in the manuscript. These changes will not influence the content and framework of the paper. And here we did not list the changes but marked in red in revised paper.
We appreciate for Editors/Reviewers’ warm work earnestly, and hope that the correction will meet with approval.
Once again, thank you very much for your comments and suggestions.
Yours sincerely,
Zeyang Zhou, Jun Huang
Round 2
Reviewer 1 Report
All my conterns have been addressed and the manuscript is ready for publication.
