ICACT20210158 Question.1
Questioner: baekj@wssu.edu 2021-02-08 오후 2:05:05 |
ICACT20210158 Answer.1
Answer by Auhor charnon2002@hotmail.com 2021-02-08 오후 2:05:05
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| Charnon. I enjoyed seeing your interesting research and presentation. According to your results, the 2D errors (especially for Min. 2D error) sometimes did not show the linear improvement as you increase the length of the observing sessions. When length is set to 15min, 30min, and 60min, Min.2D error is 3.8, 11.5, and 2.4, respectively. Would you tell me what can be a reason for this inconsistency? |
The observation error value depends on the sky weather conditions during the experiment.
In slide 20, We count the number of 2D Errors less than 1 meter and 50cm compared with a total number of experimental in order to represent the confidence level of data. |
ICACT20210158 Question.2
Questioner: franklinlu888@outlook.com 2021-02-08 오전 10:16:03 |
ICACT20210158 Answer.2
Answer by Auhor charnon2002@hotmail.com 2021-02-08 오전 10:16:03
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| Whether is a big problem of GPS. What is your solution? |
As an experiment, we can actually record the signal from GNSS, but the limitation of smartphones is high-quality antennas that cannot be inside smartphones. We also hope that in the future, a smartphone model capable of recording GNSS signal will be able to connect to a high-quality external antenna like a professional GNSS receive. |
ICACT20210158 Question.3
Questioner: franklinlu888@outlook.com 2021-02-08 오전 11:06:31 |
ICACT20210158 Answer.3
Answer by Auhor charnon2002@hotmail.com 2021-02-08 오전 11:06:31
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| Compared with the professional GPS receiver, the accuracy of the smartphone for GPS or GNSS might be limited. However, the positioning of WIFI AP improves the accuracy of positioning. Do you think that improving the distance accuracy from WIFI AP will be easy for the better performance of your positioning system? |
We think using Wi-Fi positioning and using GNSS positioning are different solutions, we think Wi-Fi might not help with the accuracy of our solution. Our research focuses on the application of a dual-frequency GNSS chip embedded in smartphones, allowing smartphones with only dual-frequency GNSS observations to be recorded. Our applications can be used where there is no cellular and Wi-Fi signal available. |
ICACT20210158 Question.4
Questioner: liuxinwei96@outlook.com 2021-02-08 오전 11:32:38 |
ICACT20210158 Answer.4
Answer by Auhor charnon2002@hotmail.com 2021-02-08 오전 11:32:38
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| Have you found the best observation length? |
The result of the 60-minute GPS+GLONASS observation period can be an archived 2D error at 2.4 cm. The best observation length should be more than 60 minutes. |
ICACT20210158 Question.5
Questioner: omegamon@cbnu.ac.kr 2021-02-08 오후 2:18:10 |
ICACT20210158 Answer.5
Answer by Auhor charnon2002@hotmail.com 2021-02-08 오후 2:18:10
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| Thank you for your presentation.
How do you think about applying your suggestion to vehicle?
Is it plausible? |
Yes, It's possible. In real time a GNSS receiver can derive a PVT solution once it has measurements based on the pseudoranges. |
ICACT20210158 Question.6
Questioner: franklinlu888@outlook.com 2021-02-08 오후 2:59:42 |
ICACT20210158 Answer.6
Answer by Auhor charnon2002@hotmail.com 2021-02-08 오후 2:59:42
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| Hi, I am the chair of this session, Bing-Yuh Lu, who comes from the Guangdong University of Petrochemical Technology, Guangdong, China. Thank you for presenting the wonderful report and interactive Q & A. The Q & A disclosed the potential solutions for the research by us together. May we will win the great achievement of future researches! |
It’s my pleasure to do that. |
ICACT20210158 Question.7
Questioner: h.warunyu@gmail.com 2021-02-09 오후 1:18:22 |
ICACT20210158 Answer.7
Answer by Auhor charnon2002@hotmail.com 2021-02-09 오후 1:18:22
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| According to the 7th slide of your presentation, your research uses the smartphone to record GNSS Raw measurement. Can that data can be disturbed or be accessed by anonymous used? |
No, the data cannot be disturbed because while receiving a satellite signal there is no internet or network connection whatsoever. After recording the data already, we will send it to processing later. |
ICACT20210158 Question.8
Questioner: skdiakffn@ajou.ac.kr 2021-02-10 오후 1:32:12 |
ICACT20210158 Answer.8
Answer by Auhor charnon2002@hotmail.com 2021-02-10 오후 1:32:12
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| If point positioning is possible with a high accuracy of centimeter-level, where can we utilize it? |
In the survey work to create maps.
https://webapp.geod.nrcan.gc.ca/geod/tools-outils/ppp.php |
