While the flexibility, mobility and simple point to point technologies, WLAN positioning system has gradually become a research hotspot.
同时由于WLAN的灵活性、移动性和简单的点对点技术等有优势，使得基于WLAN的位置服务系统逐渐成为研究热点。
The traditional point-by-point imaging modality is very simple, however, it needs complex experimental setup and there exist positioning error.
传统的逐点重建法算法简单，但实验装置复杂，且存在对焦误差。
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