A Space–Time Coding Array Sidelobe Optimization Method Combining Array Element Spatial Coding and Mismatched Filtering
Round 1
Reviewer 1 Report
Comments and Suggestions for AuthorsIn this paper, an optimization method for STCA which combines the array spatial coding at transmitting end and mismatched filter designing at receiving end is proposed.
The main contribution of this paper is to propose an optimization about the sidelobe problems of STCA: resonance phenomenon and resolution loss problem. An optimization method combining array elements spatial coding at transmitter and mismatched filtering at receiver is proposed. In the simulation, the multi-dimensional ambiguity function is applied as the evaluation tool.
The paper needs some corrections before to be published as follow:
1- Is no clear in the text the explanation of the Figure 3l Please intert in the text an appropriate explanation.
2- Idem action proposed in point 1 with Figure 4.
3- Please check the acronymous explanation along the text, as: PSLR (line 273), QCQP (line 283 and SOCP (line 284) and others.
4- In line 305 is cosigned “Section III” and must be “Section 3”.
Withs these corrections the paper deserves its publication.
Author Response
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Author Response File: 
Author Response.pdf
Reviewer 2 Report
Comments and Suggestions for AuthorsThis manuscript (ID: remotesensing-3157913)presents a space-time encoding array sidelobe optimization method that combines element space encoding and mismatch filtering. Digital array radar can be fully digitized at both the transmitting and receiving ends. Space time encoding array is a typical multidimensional waveform encoding array.
1. The abstract needs to be modified and adjusted because the characteristics of digital array radar are too detailed and occupy a lot of space. The focus of the abstract is on the purpose and methods of this study, as well as the induction and summary of the results。
2. For Table 1, the numbers and units in the data need to be separated by spaces。
3. In line 341, "Above all," should be deleted because this phrase repeats the word used at the beginning of the next paragraph, and there is no need to summarize it again here.
4. Introducing small time delays between different transmission array elements to achieve transmit diversity, what are the drawbacks of "time delay" for analysis requirements that require high refresh rates?
5. Has the ontology model of the simulation object been experimentally tested for Figure 7?
Author Response
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Author Response File: Author Response.pdf
Reviewer 3 Report
Comments and Suggestions for Authors
The submitted paper presents a study dealing with the optimization of STCA aiming at the two key problems of resonance phenomenon and the resolution loss problem of STCA. The topic and the proposed idea are interesting. The paper is somewhat complete with adequate theoretical results accompanied by sufficient analyses and discussions. However, some improvements are necessary.
1) Fig. 2 highlights the antenna beam pattern of STCA in the frequency domain. It could be interesting also report the array gain value as a function of the frequency-angle.
2) During the evaluation of the frequency domain beam pattern, was the beam pattern of each radiating element considered? Apparently not. The authors are invited to clearly explain this issue and modify the analysis by considering real element factor of the array (e.g. cos(q), sin(q), etc.)
3) In the proposed method (Section 4) the authors change the pattern of the transmitting array. The authors are invited to consider the mixed antenna element factor in similar topics.
Comments for author File: Comments.pdf
Author Response
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Author Response File: Author Response.pdf
Round 2
Reviewer 2 Report
Comments and Suggestions for AuthorsThe author has made revisions to this manuscript, including the abstract, introduction, and methodology. The following aspects need to be further improved。
1. Relevant literature on filtering and space-time encoding array sidelobes in the past 3 years needs to be read and cited。
2. The literature list needs to be updated, and the proportion of literature in the past 5 years needs to be increased.
3.For Figure 8, the scale on the vertical axis needs to be displayed in detail, as some curves have drastic fluctuations and peak changes.
Author Response
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Author Response File: Author Response.pdf
Reviewer 3 Report
Comments and Suggestions for AuthorsI would like to thank the authors for the revision. The paper quality considerably improved.
Author Response
Dear reviewer:
Thank you very much for your comments for our manuscript entitled “A Space-Time Coding Array Sidelobe Optimization Method Combining Array Element Spatial Coding and Mismatched Filtering” (ID: remotesensing-3157913). Those comments are all valuable and very helpful for revising and improving our manuscript, as well as the important guiding significance to our researches.
