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Journal Article
방향성 데이터 필터링과 다중 시작 초기화, 파라미터 고정 결합 공동 최적화를 이용한 Wi-Fi AP 위치 추정 기법
- Issue Date
- 2026-03
- Citation
- Journal of Positioning, Navigation, and Timing, v.15, no.1, pp.33-43
- ISSN
- 2288-8187
- Publisher
- 사단법인 항법시스템학회
- Language
- Korean
- Type
- Journal Article
- Abstract
- This paper proposes a robust optimization framework for indoor Wi-Fi access point (AP) localization that combines multi-start initialization with explicit handling of missing directional measurements. Our previous study employed an environment-adaptive path-loss model with directional bias compensation and showed that unknown APs can be localized with reasonable accuracy even under limited measurement conditions. However, the suggested approach suffered from performance instability due to sensitivity to initial values and the presence of unreliable or missing heading information. To address these issues, the method proposed in this study (i) filters out invalid directional measurements when estimating the path-loss exponent and directional biases, (ii) performs AP-wise localization using two complementary initial positions derived from geometric and signal-strength heuristics, and (iii) jointly refines the locations and transmit powers of all unknown APs while keeping the global path-loss exponent and directional biases fixed. Experiments conducted on Wi-Fi RSSI data collected at 48 measurement points in a real indoor environment show that the proposed algorithm reduces the mean localization error by approximately 38.5%, from 3.23 m to 1.99 m, compared with the previous work. In particular, for AP_Y, which exhibited the largest localization error with the previous work, the error is reduced to less than half across a wide range of data-usage ratios. These results indicate that the proposed framework improves the stability and practical applicability of model-based indoor Wi-Fi localization with unknown AP positions.
- Keyword
- indoor localization, Wi-Fi positioning, AP estimation, RSSI signal, multi-initialization optimization, 실내 위치 추정, Wi-Fi 위치 추정, 액세스 포인트 추정, RSSI 신호, 다중 초기화 최적화
- KSP Keywords
- Adaptive path, Data collected, Directional bias, Global Path, IEEE 802.11(Wi-Fi), Indoor environment, Initial value, Localization errors, Measurement points, Multi-start, Optimization framework
This work is distributed under the term of Creative Commons License (CCL)
(CC BY NC)
(CC BY NC)
