A Telemetry, Tracking, and Command Antennas System for Small-Satellite Applications
, Patrizia Livreri 2, Loreto Di Donato 3, Concetto Squadrito 4 and Gino Sorbello 3Round 1
Reviewer 1 Report
paper titled "A Telemetry, Tracking, and Command Antennas System for Small Satellites Applications" provide very good idea for small scale satellites system tracking. In the paper it is still unclear that what is the significance and motivation behind this scheme. Line 127.. is it an angle sign. if so pelease improve this sign in entire paper. The text in the plots and in a paper is not same. Please make it same. What is f_I, f_c, f_h I,c,h, should be in subscript.
The plots are already explained in a lable. so in figure caption dont need to mention (dashed line) or (straight line)
Author Response
Author's Reply to the Review Report (Reviewer 1)
Paper titled "A Telemetry, Tracking, and Command Antennas System for Small Satellites Applications" provide very good idea for small scale satellites system tracking.
We thank Reviewer for appreciating our work.
In the paper it is still unclear that what is the significance and motivation behind this scheme.
The TTC (Telemetry Tracking and Command) link of a satellite is of prime importance, right from the time of its launch to the end of the mission.
These subsystems provide an uplink for command signal, a downlink for monitoring signal and various health parameters through telemetry and tracking information for monitoring its position in orbit.
This information has been added in the revised manuscript and is labeled with margin note [R1a] in the marked version.
Line 127.. is it an angle sign. if so please improve this sign in entire paper.
The symbol has been changed in the entire paper.
Also, a paragraph on the notation adopted has been added in the revised paper.
(See change marked with margin note [R1b])
The text in the plots and in a paper is not same. Please make it same.
What is
f_I, f_c, f_h
I,c,h,
should be in subscript.
The text in Fig. 17 has been modified and I,c,h, are now in subscript.
[R1c]
The plots are already explained in a label so in figure caption do not need to mention (dashed line) or (straight line)
The caption of Fig.15 and Fig.16 have been modified according to the Reviewer suggestion.
Reviewer 2 Report
The paper describes the analysis and design of an antenna system for telemetry tracking and command (TT&C) usable for small satellites applications. The system foresees the use of four antennas, two for the RHPC and two for the LHPC, suitable to guarantee an almost isotropic coverage. Each antenna is formed by two stacked annular patches between which an air cavity is inserted whose purpose is to widen the antenna band and control the cross polarization level. After performing an adequate optimization process the antenna exhibits an impedance bandwidth of 19.7%, a circular polarization with a maximum gain higher than 6 dBi and an axial ratio below 4 dB in the frequency band 2.0–2.3 GHz. The measurements performed on an antenna prototype resulted in good agreement with the numerical results.
The paper may be of interest for the readers, however, some simple improvements are needed before the manuscript appears suitable for publication. For the authors’ convenience they are listed below.
For what practical application it is useful to work in the 2.0-2.3 GHz band? Please, specify in the revised version of the manuscript.
After the sentence “Indeed, several kinds of missions like communications, remote sensing and earth observation are now possible despite the small dimension of the platform” insert specific references to support the statement contained in the sentence.
The full-wave numerical technique used for the analysis and the design of the proposed antenna system should be indicated in the manuscript.
For the reader’s convenience the color bars in Fig. 3 must be enlarged (the numerical values present in both are illegible).
In the caption of Fig. 12 insert “(a)” and “(b)” to indicate top and side view.
The dielectric permittivity of the radome (Delrin POM) must be indicated in the revised manuscript.
Author Response
Author's Reply to the Review Report (Reviewer 2)
The paper describes the analysis and design of an antenna system for telemetry tracking and command (TT&C) usable for small satellites applications.
The system foresees the use of four antennas, two for the RHPC and two for the LHPC, suitable to guarantee an almost isotropic coverage.
Each antenna is formed by two stacked annular patches between which an air cavity is inserted whose purpose is to widen the antenna band and control the cross polarization level.
After performing an adequate optimization process the antenna exhibits an impedance bandwidth of 19.7%,
a circular polarization with a maximum gain higher than 6 dBi and an axial ratio below 4 dB in the frequency band 2.0--2.3 GHz.
The measurements performed on an antenna prototype resulted in good agreement with the numerical results.
We thank the Reviewer for appreciating our work.
The paper may be of interest for the readers, however, some simple improvements are needed before the manuscript appears suitable for publication.
For the authors' convenience they are listed below.
For what practical application it is useful to work in the 2.0-2.3 GHz band?
Please, specify in the revised version of the manuscript.
The sentence "The S-band in the frequency interval 2.0--2.3 GHz is used for TT&C [4]" has been added in the revised version of the manuscript.
This change has been labeled with side note [R2a] in the marked revised manuscript.
After the sentence
"Indeed, several kinds of missions like communications, remote sensing and earth observation are now possible despite the small dimension of the platform"
insert specific references to support the statement contained in the sentence.
References [1]-[3] have been added.
The change is marked with a margin note [R2b] in the marked revised manuscript.
The full-wave numerical technique used for the analysis and the design of the proposed antenna system should be indicated in the manuscript.
This piece of information has been added.
See margin note [R2c].
For the reader's convenience the color bars in Fig. 3 must be enlarged (the numerical values present in both are illegible).
The color bars have been suppressed.
The energy of the eigensolution for a patch cavity with PMC walls is arbitray. The information in the color bars would be redundant.
In the caption of Fig. 12 insert (a) and (b) to indicate top and side view.
The caption of Fig. 12 has been modified accordingly.
[R2e]
The dielectric permittivity of the radome (Delrin POM) must be indicated in the revised manuscript.
This information has been added.
[R2f]
