Stepped-Frequency Continuous-Wave Signal Processing Method for Human Detection Using Radars for Sensing Rooms through the Wall

Round 1

Reviewer 1 Report

The manuscript (inventions-1869690), Stepped-Frequency Continuous-Wave Signal Processing Method for Human Detection Using in Radars Sensing Rooms Through the Wall, shows interesting results of a proposed human detection method. Authors presented quite comprehensive analysis in this manuscript. Some minor comments would like to provide here for authors' reference, shown below - 

1. For all the figures, please add the Y axis unit to clarify here. 

2. Please add a simple benchmark Table to compare the current work and previous research works (power/area/speed/accuracy etc...). This would be quite helpful for this referee and potential readers to get a further insight of the research work impact and contribution in this work as compared to other works. 

Due to the above comments, this referee would like to put the manuscript status as "Minor Revision" in the current phase.

Author Response

Please, see the attached file.

Author Response File: Author Response.pdf

Reviewer 2 Report

The article is difficult to understand and review, because references to sources are incorrect.

The main disadvantage is the abundant citation of Russian-language articles that are inaccessible to the English-speaking reader. This shortcoming must be eliminated.

It is desirable to place images of the experimental setup and the place of experiments or its drawing.

After eliminating these shortcomings, the article can be submitted for re-review.

Author Response

Please, see the attached file.

Author Response File: Author Response.pdf

Reviewer 3 Report

The topic of the paper is potentially interesting but there are different concerns to be addressed, in detail:

In my version of the file, the reference links are missing, I read the phrase: [Error! Reference source not found.], thus please pay attention to this aspect.

I think equations 1 and 2 are redundant, you can keep only one of these.

I suggest to add a picture of the employed radar prototype and experimental setup.

To my best understanding, Fig. 3 should be Fig. 2b improved. However, the target is located at different range bins between the two figures, thus the raw data might be different.

The axis label of Fig. 4 are not properly shown.

The quality of Fig. 6 should be improved.

I do not see significant result improvement after implementing your method, neither with respect to the shown raw data nor to the scientific literature.

Currently, the contribution of this work to the literature is not clear. The authors should better clarify the novelty of the paper. Moreover, the effectiveness of the method is not clear based on the shown results.

I suggest to update the reference list by adding articles belonging to high level and high quality journals, like:

E. Cardillo, C. Li and A. Caddemi, "Embedded heating, ventilation, and air-conditioning control systems: From traditional technologies toward radar advanced sensing,” Review of Scientific Instruments 92, 061501 (2021), June 2021, doi: doi.org/10.1063/5.0044673.

E. Cardillo, C. Li and A. Caddemi, "Millimeter-Wave Radar Cane: A Blind People Aid With Moving Human Recognition Capabilities," in IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology, vol. 6, no. 2, pp. 204-211, June 2022, doi: 10.1109/JERM.2021.3117129.

S. M. M. Islam, O. Boric-Lubecke, V. M. Lubecke, A. -K. Moadi and A. E. Fathy, "Contactless Radar-Based Sensors: Recent Advances in Vital-Signs Monitoring of Multiple Subjects," in IEEE Microwave Magazine, vol. 23, no. 7, pp. 47-60, July 2022, doi: 10.1109/MMM.2022.3140849.

S. M. M. Islam, O. Boric-Lubecke and V. M. Lubekce, "Concurrent Respiration Monitoring of Multiple Subjects by Phase-Comparison Monopulse Radar Using Independent Component Analysis (ICA) With JADE Algorithm and Direction of Arrival (DOA)," in IEEE Access, vol. 8, pp. 73558-73569, 2020, doi: 10.1109/ACCESS.2020.2988038.

Author Response

Please, see the attached file.

Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

Dear Authors,

In any case, the use of references in Russian in an English-language paper is not correct. I recommend avoiding this in the future.

It may be interesting for you to familiarize with the history of the issue, because similar studies were being carrying out for several decades. See for example:

- S.I. Ivashov, V.V. Razevig, A.P. Sheyko, I.A. Vasilyev, Detection of Human Breathing and Heartbeat by Remote Radar. Progress in Electromagnetics Research Symposium (PIERS 2004), March 28-31, 2004, Pisa, Italy, pp. 663-666.
- A.S. Bugaev, V.V. Chapursky, S.I. Ivashov, V.V. Razevig, A.P. Sheyko, I.A. Vasilyev, Through Wall Sensing of Human Breathing and Heart Beating by Monochromatic Radar. Proceedings of the Tenth International Conference on Ground Penetrating Radar, GPR’2004, June 21-24, 2004, Delft, The Netherlands, Vol. 1, pp. 291-294.

Reviewer 3 Report

Now I consider the paper acceptable for publication in the present journal.