Design of a Digital Array Signal Processing System with Full Array Element

Round 1

Reviewer 1 Report

This paper addresses a design methodology for a full-element digital array signal processing system and provides a comprehensive demonstration of this approach through system design, algorithm simulation, hardware implementation, and experimental validation, which solves the problems of large volume, heavy weight, high power consumption, and integration challenges in traditional array signal processing systems. I believe that this work exhibits a certain level of innovation and is well-organized. The topic is relevant to Remote Sensing. I recommend publishing this paper and consider the following suggestions:

1)     Please standardize the format of the x and y-axis in some of the figures, for example, in Figures 4(a), 4(b), 4(c), and 4(d).

2)     The explanations provided by the authors for the various parts in Figure 9(a) and Figure 9(b) are not sufficiently clear. Please provide a detailed explanation of the channel synchronization test results in Figure 9.

3)     How are the setup time (Tsetup) and hold time (Thold) of the reference clock defined in Equations (2) and (3)? Please explain.

4)     The matrix H in Equation (6) is not defined by the authors in the preceding or subsequent text. Please check this issue and make the necessary modifications to define matrix H.

5)     The authors have presented the transmission calibration module and the reception calibration module in Figure 1. Is there any connection between these modules and the channel calibration process shown in Figure 13? Please explain the specific roles and workflows of the transmission calibration module and reception module.

6)     Please summarize the advantages and disadvantages of the RFSoC-based digital array signal processing system compared to traditional systems in terms of system synchronization, performance, size, and power consumption. Additionally, discuss potential future improvements for this system.

7)     There is some confusion regarding the multi-channel synchronization results presented in the authors' paper. In Figure 10, the measured results for channel synchronization show very small delays, close to 5ps. This level of synchronization appears outstanding for a multi-channel system. Is this synchronization result achieved without performing channel phase calibration? Could you please explain the specific actions taken in software and hardware to achieve this level of synchronization?

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Reviewer 2 Report

I would like to improve the article, by answering my questions may improve the article in better manner

Designing a digital array signal processing system with a full 2-array element can be a complex and research-intensive task. Here are some review questions that could help guide your research and evaluation of such a system:

1. 1. What are the main objectives and goals of the digital array signal processing system with full 2-array elements?
2.  
3. 2. What is the theoretical basis for using a full 2-array element configuration in this signal processing system?
4.  
5. 3. How does the performance of a full 2-array element system compare to other configurations, such as subarrays or sparse arrays?
6.  
7. 4. What are the key advantages and disadvantages of using a full 2-array element setup in terms of signal processing capabilities and system complexity?
8.  
9. 5. What are the specific challenges and considerations in designing a digital signal processing algorithm tailored for a full 2-array element configuration?
10.  
11. 6. How does the system address issues related to beamforming, direction-of-arrival estimation, and spatial filtering with the full 2-array element setup?
12.  
13. 7. What are the hardware requirements for implementing a digital array signal processing system with a full 2-array element configuration?
14.  
15. 8. How does the system handle real-world considerations, such as element failures, mutual coupling, and environmental noise?
16.  
17. 9. What are the different methods used to calibrate and compensate for any imperfections or irregularities in the full 2-array element setup?
18.  
19. 10. Can the system adapt to dynamic environments and varying signal conditions effectively? What techniques are used for adaptive signal processing in this context?
20.  
21. 11. What are the potential applications and use cases for the full 2-array element system in practical scenarios, such as radar, sonar, wireless communication, or medical imaging?
22.  
23. 12. Are there any limitations or constraints in the system's performance, and how can they be mitigated or improved upon?
24.  
25. 13. How does the digital array signal processing system with full 2-array element perform in comparison to other state-of-the-art systems or benchmarks?
26.  
27. 14. What are the possible future research directions or enhancements for this system to improve its performance, scalability, or applicability to different domains?
28.  
29. 15. How does the full 2-array element system handle computational complexity and memory requirements, especially when dealing with a large number of elements?
30.  
31. 16. Are there any cost considerations or practical constraints that might affect the implementation or adoption of this system in real-world scenarios?

 

 

Author Response

Please see the attachment.

Author Response File: Author Response.docx