【摘要】：為了提高室內(nèi)定位精度,實(shí)現(xiàn)三維定位,提出一種基于蟻群算法的的可見光通信室內(nèi)高精度三維定位系統(tǒng)。本系統(tǒng)采用了碼分多址(Code Division Multiple Access,CDMA)調(diào)制技術(shù),解決了室內(nèi)可見光通信多信號(hào)源之間的符號(hào)間干擾.系統(tǒng)中與發(fā)光二極管(Light Emitting Diode,LED)光信號(hào)源地理位置相關(guān)的ID信息碼經(jīng)過直接擴(kuò)頻調(diào)制后加載至發(fā)光二極管驅(qū)動(dòng)電路,以光信號(hào)的形式在室內(nèi)傳播.光信號(hào)經(jīng)過放大、濾波、采樣處理后,根據(jù)碼分多址調(diào)制技術(shù)中擴(kuò)頻碼的正交性恢復(fù)出ID信息及光強(qiáng)衰減信息.經(jīng)過計(jì)算獲得來自不同發(fā)光二極管的信號(hào)光強(qiáng)衰減因子,利用蟻群算法的全局搜索性確定最優(yōu)定位點(diǎn).引入誤差修復(fù)因子,利用蟻群算法的并行搜索性對(duì)光強(qiáng)衰減因子偏差進(jìn)行修正.仿真結(jié)果表明,信噪比為30dB,20dB,10dB的條件下,算法的定位精度分別為2cm,4cm,8cm.當(dāng)計(jì)算的精度高于45cm時(shí),蟻群算法定位解的搜索效率明顯高于遍歷法.在10dB的信噪比條件下,對(duì)光強(qiáng)衰減因子進(jìn)行修正后100%的測(cè)試點(diǎn)都實(shí)現(xiàn)了5cm定位精度.實(shí)驗(yàn)結(jié)果表明,20dB信噪比條件下,92.59%的測(cè)試點(diǎn)的定位誤差小于8cm,96.29%的測(cè)試點(diǎn)定位誤差小于10cm,最大定位誤差為11.30cm.經(jīng)過誤差修復(fù)后,96.2%的測(cè)試點(diǎn)實(shí)現(xiàn)了3cm的定位精度,61.6%的測(cè)試點(diǎn)實(shí)現(xiàn)了2cm的定位精度.本算法在實(shí)現(xiàn)了高精度定位,減少了獲得最優(yōu)定位解的計(jì)算量.
[Abstract]:In order to improve the accuracy of indoor positioning and realize 3D positioning, a high precision 3D positioning system for visible light communication room based on ant colony algorithm is proposed. Code division multiple access (Code Division Multiple) CDMA) modulation technology is used to solve the inter-symbol interference between multiple signal sources in indoor visible light communication. The ID code which is related to the geographical position of the light emitting diode (Light Emitting) signal source is loaded into the LED driving circuit after direct spread spectrum modulation and propagates in the form of optical signal. After the optical signal is amplified, filtered and sampled, the ID information and the optical intensity attenuation information are recovered according to the orthogonality of the spread spectrum code in the code division multiple access modulation technology. The attenuation factor of signal intensity from different LEDs is calculated, and the optimal location point is determined by using the global search ability of ant colony algorithm. The error repair factor is introduced and the deviation of attenuation factor of light intensity is corrected by the parallel search of ant colony algorithm. The simulation results show that when the SNR is 30 dB, the location accuracy of the algorithm is 2 cm ~ 4 cm ~ (-1) and 8 cm ~ (-1) respectively. When the accuracy of calculation is higher than that of 45cm, the searching efficiency of ant colony algorithm is obviously higher than that of ergodic method. Under the condition of signal-to-noise ratio (SNR) of 10dB, the accuracy of 5cm positioning is achieved at 100% of the test points after correction of the attenuation factor of light intensity. The experimental results show that the location error of 92.59% of the test points is less than 8 cm, 96.29% of the test points is less than 10 cm, and the maximum positioning error is 11.30 cm 路m ~ (-1) at 20 dB signal-to-noise ratio. After error repair, 96.2% of the test points achieve the positioning accuracy of 3cm and 61.6% of the test points achieve the positioning accuracy of 2cm. The algorithm can achieve high precision localization and reduce the computational cost of obtaining the optimal location solution.
【作者單位】： 華南理工大學(xué)材料科學(xué)與工程學(xué)院;華南理工大學(xué)發(fā)光材料與器件國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：廣東省及廣州市科技計(jì)劃項(xiàng)目(Nos.2013B090600048、2015B010134001、2015B010127004、2015YT02C093、201604040004、201604010006)資助~~
【分類號(hào)】：TN929.1

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本文編號(hào)：2142041