Passive Radio-Frequency Identification Tag-Based Indoor Localization in Multi-Stacking Racks for Warehousing
Abstract
:1. Introduction
2. Research Background
2.1. Introduction to RFID
2.2. RFID-Based Indoor Location Identification Methods
3. Inventory Location Identification Framework in MSR
3.1. Configuration of Tag Information
3.2. Indentification of Inventory Location
Algorithm 1. Inventory location identification |
Index: i: Index of column (i = 1 ,.., I) j: Index of row (j = 1, …, J) N: Number of the item loaded in each zone of the MSR c: Index of the radio-wave generation of the RFID reader in the j-th row (c = 1 ,…, C) Parameters: = A set of recognized tags when the RFID reader generates the c-th radio wave (i.e., the RFID reader performs the c-th scanning) in the j-th row of the rack = A set of recognized tags in which only one reference tag exists among . (Note that only the first recognized has to be selected if there are several ) = [Decision value] A set of identified item locations in Method: Step 1: Set T according to the distance between two adjacent reference tags attached to the MSR. Step 2: Calculate according to Equation (2) and set the measurement distance of the RFID reader within . Step 3: Set the tag recognition interval of the RFID reader, recognizing speed, and Step 4: Set i = 1 and j = 1, scan the tag information of the stock, and distinguish among . Step 5: Set = . Step 6: Exclude the reference tags and from : = − − reference tags. While c = C do{ c = c + 1 Exclude from : − If the number of stocks in = N, then let i = i + 1 and go to Step 5 }. Step 7: If i = I, then let j = j + 1, i = 1, c = 1, and go to Step 5. Stopping rule: If i = I and j = J, then the algorithm terminates. |
4. Experiment and Discussion
4.1. Results for the Accuracy of the Measurement Distance and Inventory Location Recognition
4.2. Results for Item Location Identification
5. Concluding Remarks
Author Contributions
Funding
Conflicts of Interest
References
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Recognized Tag Information of Stocks | Number of Reference Tags | ||
---|---|---|---|
A, A1, A2, A3, A4 | 1 | ||
A, A1, A2, A3, A4, A5, B | 2 | ||
A, A2, A3, A4, A5, A6, B | 2 | ||
B, A3, A4, A5, A6, A7 | 1 | ||
B, C, A4, A5, A6, A7, A8 | 2 | ||
B, C, A5, A6, A7, A8, A9 | 2 | ||
C, A6, A7, A8, A9, A10 | 1 | ||
C, A7, A8, A9, A10, A11, D | 2 | ||
C, A8, A9, A10, A11, A12, D | 2 | ||
D, A9, A10, A11, A12 | 1 | ||
D, A10, A11, A12 | 1 | ||
D, A11, A12 | 1 | ||
- | 0 |
Number of Stocked Items | Tag Recognition Intervals of the RFID Reader (sec) | ||||||||
---|---|---|---|---|---|---|---|---|---|
0.3 | 0.5 | 1 | 2 | 3 | 4 | 5 | Mean | Standard Deviation | |
1 | 100 | 100 | 100 | 85 | 70 | 50 | 50 | 79 | 22.8 |
2 | 100 | 100 | 100 | 80 | 60 | 30 | 30 | 71 | 31.8 |
3 | 100 | 95 | 95 | 75 | 55 | 25 | 20 | 66 | 33.8 |
4 | 95 | 90 | 90 | 70 | 50 | 15 | 10 | 60 | 35.9 |
5 | 90 | 80 | 80 | 60 | 35 | 10 | 0 | 51 | 36.1 |
6 | 90 | 80 | 80 | 55 | 30 | 5 | 0 | 49 | 37.3 |
7 | 90 | 80 | 80 | 45 | 15 | 0 | 0 | 44 | 39.6 |
Mean | 95 | 89 | 89 | 67 | 45 | 19 | 16 | ||
Standard deviation | 5.0 | 9.3 | 9.3 | 14.4 | 19.1 | 17.2 | 19.0 |
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Park, J.; Kim, Y.-J.; Lee, B.K. Passive Radio-Frequency Identification Tag-Based Indoor Localization in Multi-Stacking Racks for Warehousing. Appl. Sci. 2020, 10, 3623. https://doi.org/10.3390/app10103623
Park J, Kim Y-J, Lee BK. Passive Radio-Frequency Identification Tag-Based Indoor Localization in Multi-Stacking Racks for Warehousing. Applied Sciences. 2020; 10(10):3623. https://doi.org/10.3390/app10103623
Chicago/Turabian StylePark, Jaehun, Yong-Jeong Kim, and Byung Kwon Lee. 2020. "Passive Radio-Frequency Identification Tag-Based Indoor Localization in Multi-Stacking Racks for Warehousing" Applied Sciences 10, no. 10: 3623. https://doi.org/10.3390/app10103623