Hybrid RSS/AOA Localization using Approximated Weighted Least Square in Wireless Sensor Networks

Round 1

Reviewer 1 Report

Please describe better the difference between Proposed ECWLS and Real ECWLS. Add more comments to measured results.

Author Response

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Reviewer 2 Report

The manuscript presents a method for localization of targets which is based on weighted least squares solution of system of linear equations.  As weight function is used approximated  error covariance matrix.  Numerical experiments  validate proposed new method.

 

Additional comments:

Instead of "linear equation"   write "system of linear equations" before (5).  It is not clear how (14) are obtained. Write more details with references to used equations. Page 5, row 92: Reformulate "Note that ...". Now this sentence is not clear and E is not explained. Explain with  more details and  references to used equations how (16)-(18) are obtained.  Equation (11): not clear, check it  or explain more  why you don't have derivatives of lambda in the  second and third terms of Taylor's  expression.

Author Response

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Reviewer 3 Report

1. In the Introduction, the authors should more clearly give the challenges of current localization algorithms and motivation of this paepr. Furthermore, the contributions of this paper should be summarized systematically. 2. The authors should add a section of related works to introduce the previous studies about localization algorithms in WSN. Some important literatures should be cited, such as [1] Improved range-free localization for three-dimensional wireless sensor networks using genetic algorithm, Computers & Electrical Engineering, Volume 72, 2018, Pages 808-827. [2] A high accurate localization algorithm with DV-Hop and differential evolution for wireless sensor network. Applied Soft Computing, Vol. 68, July 2018, pp. 39-52. [3] Bi-iterative algorithm for joint localization and time synchronization in wireless sensor networks, Signal Processing, Volume 154, 2019, Pages 304-313. 3. In the section 3, the authors should give an overall flowchart to describe the proposed method, and clearly explain the innovation of this proposed method. Besides, the complexity of the proposed method should also be discussed. 4. In the experiments, the set up of simulation should be clearly described. The proposed method should also be evaluated in a lagre-scale. Current simulation is hard to follow by the readers. 5. The three compared algorithms are a little older. Some state-of-the-art algorithms should be compared.

Author Response

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Reviewer 4 Report

Authors present a target localization method using an approximated error covariance matrix based weighted least squares (WLS) solution, which integrates received signal strength (RSS) and angle of arrival (AoA) data for wireless sensor networks.
The article describes very clearly the motivation and fit of their method in the state of the art, the development of it and the evaluation of its performance through simulations.

In my opinion, the paper almost can be accepted in this form. Just some very minor comments:
- Remove the reference [16] in line 3 from the abstract.
- The references [2] and [8] are the same.
- On line 134, the words "our method" are repeated.
- The quality of the figures showing the results of the simulations can be improved: on the one hand, increase the size of the markers to make them easier to read when the paper is printed in black and white. On the other hand, include the figures in vector format, not bitmap.

Author Response

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Author Response File: Author Response.pdf

Round 2

Reviewer 3 Report

The authors have addressed all my concerns.