Research Article
A Mobile Anchor Assisted Localization Algorithm Based on Regular Hexagon in Wireless Sensor Networks
Algorithm 1
MAALRH algorithm.
Step 1. The ROI is divided into subrectangles which satisfy . The communication range of the mobile | anchor is equal to the resolution, that is, . | Step 2. The mobile anchor traverses the ROI following the regular hexagon movement trajectory (the concretely movement | trajectory is depicted in Figures 5 and 7) while periodically broadcasting anchor packets , where | denotes the sending time, stands for its current location, and represents the packet ; | Step 3. Unknown nodes receive the anchor packets broadcasted by the mobile anchor and estimate distances to them | by using the RSSI technique; | Step 4. Each unknown node decides if any of the three noncoplanar anchor coordinates can almost form a regular | triangle and if it is within the regular triangle. If so, the unknown node calculates its location by using the trilateration. |
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