A Hybrid Marker-Based Indoor Positioning System for Pedestrian Tracking in Subway Stations
Round 1
Reviewer 1 Report
An interesting indoor positioning system enhanced by QR-based and vision-based positioning technologies is proposed in this manuscript.
- However, the manuscript in the current form looks like a project report rather than an academic research paper. It is better to pay more attention to showing the innovations of this manuscript, maybe in Section 3 or Section 4.
- In Section 4.3, It is better to show the comparision results in tables or quantized values such as RMSE, STD;
- Are there any limitations of the proposed system to expand it to other classical indoor scenarios such as supermarkets or underground parkings? please explain this question in words.
Author Response
please see the attached file.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Authors presented a complete system introduced in subway station for pedestrian navigation. This system utilizes markers and inertial measurement unit data, so it may be used in environments where radio navigation systems might face difficulties due to poor radio waves propagation conditions. To implement such a system authors had to introduce image processing algorithms (image detection), pedestrian tracking algorithms utilizing inertial measurements, space modelling and augmented reality. My first question is: was the presented system used for pilot operation or not. Sentence in line 472 is a bit misleading.
Despite the article is well written there are some ambiguities in few parts:
- Line 49 and 50: the sentence sounds as in multilateration methods are used both the received signal strength and roundtrip time of the signal. In fact those measurements are used to calculate distance or distance differences and one of them would be enough for this purpose. Those distances then are used to calculated positions.
- Line 60 “signal is blocked” – it is strongly attenuated
- Line 60 “absolute positioning approaches” – what does “absolute” word mean in this case?
- line 156 “user’s own color war displayed on the screen” – what color? Authors made a shortcut in this work referencing. Should be expanded
- Line 281 it is unclear who is considered as user in this part (someone who will navigate himself with the proposed system or the system owner who have to arrange markers). Will “drawing a simple layout” not affect the quality of localization? Usually the provided maps should be precise.
- Line 320-323 the idea of connection space calculation and rout finding ought to be more clearly explained. What is a “movable space”?
- Line 480 sounds as in figure 9 are shown some numerical results, but there are only pictures of markers.
- What was the distance between markers in tracking accuracy test?
Author Response
please see the attached file.
Author Response File: Author Response.pdf
