A Gravity Inspired Approach to Multiple Target Localization Through-the-Wall Using Non-Coherent Bi-Static Radar
Yee Loon Sum
Round 1
Reviewer 1 Report
This article well-written and clearly presented.
Author Response
Please see the attached file.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
The document is interesting and well written. I suggest reviewing the captions of the Figures in order to give a more concise and clear description
Author Response
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Author Response File: Author Response.pdf
Reviewer 3 Report
This paper investigates the problem of multiple target localization using a non-coherent bi-static radar with multiple receivers, in which a new clustering algorithm is proposed that is inspired by the Newton gravity. This method can work well even when some of the measurements are unavailable or missing. This paper is novel and interesting. I can recommend it for publication.
Author Response
Please see the attached file.
Author Response File: Author Response.pdf
Reviewer 4 Report
The authors presented a new clustering algorithm based on Newtonian gravity that iteratively groups particles at target locations and eliminates particles at non-target locations. This algorithm is valid even when some of the measurements are unavailable/missing or false. The manuscript is well-written, and the data has been presented concisely. However, the Reviewer feels that the Introduction part needs improvements. Currently, it is hard to follow and find the contribution of this study.
- The authors recommend reviewing the literature thoroughly at the first stage, indicating the advantages and disadvantages of current methods/schemes. Then, introduce your method and explain briefly how this your algorithm has overcome the issues in the existing literature.
- The Reviewer suggests adding more papers to the literature review. In the current manuscript, there are only 10 references which may not be enough to locate this method in state-of-the-art works.
Author Response
Please see the attached file.
Author Response File: Author Response.pdf
Reviewer 5 Report
The authors proposed a method for identify and localize multiple targets for through the wall application. The paper is more suitable for an information engineering journal than for Electronics. Indeed, the authors described the method, the algorithm, and the software deeper than the electronics. They never describe the radar, the frequency, the bandwidth and how they can reach the ellipse from a radar data set.
In general, the method is well described, but the paper is quite confused. First the standard MDPI sections are not respected. For example, the section ‘material and methods’ is distributed into introduction, section 3 and section 4. The Figures are far from their text reference (Figure 4 is never cited). The section 4 is just a list of Figure without any discussion.
Introduction: the introduction appears confuse because it is mixed with material and methods. The authors compare the bibliographic method with their method, without a full explanation. Moreover, the number of references has to be bigger than 8, due to the large number of papers about the TWRs.
I suggest separating the bibliographic introduction from the proposed method and add some schemes or drafts for explaining the method.
The authors must also explain why the non-coherent radar are more flexible, … . Nowadays the coherent radars are the standard for radar applications and their advantages are bigger than the disadvantages.
System model:
ROW 171/172 the authors start the sentence with a symbol.
Proposed algorithm: In my opinion a new method has to described mathematically and after using the code. In this section the two aspects are mixed and the theory behind is confused with the programming implementation. I suggest separating the two aspects.
Figure 4 is not referred in the text.
Results: if is not possible to compare the proposed method with other methods for the selected scenario, please use a suitable scenario. From row 371 to the end is just a list of figures without any comment and discussion. How does a reader can critically understand the picture without a discussion?
Author Response
Please see the attachment
Author Response File: Author Response.pdf
Round 2
Reviewer 4 Report
The authors have revised the manuscript well. All the concerns have been addressed.
