一種基于概率密度的WLAN 接入點(diǎn)定位的算法
doi: 10.11999/JEIT140661
基金項(xiàng)目:
江蘇省產(chǎn)學(xué)研聯(lián)合創(chuàng)新資金(BY2013003-03)資助課題
A WLAN Access Point Localization Algorithm Based on Probability Density
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摘要: 無線局域網(wǎng)(WLAN)中可以對無線接入點(diǎn)(Access Point, AP)進(jìn)行定位。該文提出一種基于概率密度的AP定位算法(Probability Density algorithm for Access Point Localization, PDAPL)。首先對實(shí)驗(yàn)區(qū)域進(jìn)行分區(qū)；然后根據(jù)定向天線在不同位置和不同角度收到的信號強(qiáng)度，計(jì)算AP落在各區(qū)域的概率，形成與密度有關(guān)的概率統(tǒng)計(jì)表；最后對AP的位置進(jìn)行評估。實(shí)驗(yàn)結(jié)果表明，該文提出的算法采集數(shù)據(jù)少，只需在少量點(diǎn)和少量角度采集信號就可以得到較高的定位精度。與DrivebyLoc, Distance和AoA相比，得到相同的定位精度PDAPL所需要的測量點(diǎn)和測量角度只是DrivebyLoc的一半左右，比Distance和AoA所需要的更少；測量點(diǎn)和測量角度數(shù)量相同時(shí)，PDAPL的定位精度相對于DrivebyLoc提升了50%左右。
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關(guān)鍵詞:
- 無線通信 /
- 接入點(diǎn)(AP)定位 /
- 定向天線 /
- 概率密度
Abstract: The Access Point (AP) in Wireless Local Area Network (WLAN) can be localized. In this paper, an AP Localization algorithm based on the Probability Density (PDAPL) is proposed. First, the region is portioned into several cells. Then, the probability of each cell is calculated according to the receive signal strength from the directional antenna in different locations and different angles, and a probability statistical table is constructed. Finally, the location of AP is assessed. Experiment results demonstrate that the proposed algorithm does not require a lot of data and can obtain relative high accuracy with a small number of measurement points and angles. Compared with DrivebyLoc, Distance, and AoA, half of or fewer measurement points and angles are needed in the case of the same accuracy with PDAPL. And for the same measurement points and angles, the accuracy of PDAPL is improved about 50% compared with DrivebyLoc. -
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