本文選題：電子地圖 + Longley-Rice模型��； 參考：《大連海事大學(xué)》2017年碩士論文

【摘要】：隨著國家"一帶一路"戰(zhàn)略的提出,未來海上貿(mào)易將會(huì)得到更快的發(fā)展。因此需要進(jìn)一步改善海上公共安全設(shè)施,提高海上無線通信的質(zhì)量。海上無線電波傳輸損耗的研究,為更好的規(guī)劃基站分布提供了良好的解決方案,是改善海上無線通信質(zhì)量的主要方法之一。單純對(duì)無線通信算法的研究,其實(shí)用價(jià)值相對(duì)較低。從國外引進(jìn)的電磁仿真軟件,雖然功能相對(duì)完善,但是可維護(hù)性差。因此需要開發(fā)適合國內(nèi)需要的電磁場(chǎng)強(qiáng)預(yù)測(cè)的仿真軟件。本文首先對(duì)海上無線通信電波傳輸損耗的經(jīng)驗(yàn)?zāi)Ｐ?主要受載波頻率、收/發(fā)天線高度、通信鏈路距離等參數(shù)的限制)進(jìn)行研究,然后采用BP(BackPropagation)網(wǎng)絡(luò)和GRNN(Generalized RegressionNeuralNetwork,廣義回歸神經(jīng)網(wǎng)絡(luò))進(jìn)行海上無線通信電波傳輸損耗預(yù)測(cè)的研究。研究結(jié)果表明,載波頻率為100MHz時(shí),使用GRNN的仿真誤差平均值、標(biāo)準(zhǔn)差和均方根誤差比BP網(wǎng)絡(luò)的仿真結(jié)果分別低 0.98dB、0.16dB 和 0.86dB;600MHz 時(shí),結(jié)果分別低 0.28dB、0.05dB 和 0.27dB;2000MHz時(shí),結(jié)果分別低1.05dB、0.13dB和0.90dB。同時(shí)將使用BP網(wǎng)絡(luò)與GRNN所建模型的仿真結(jié)果與Longley-Rice模型、Egli模型和Okumura-Hata模型分別進(jìn)行比較。實(shí)驗(yàn)結(jié)果表明,該方法不僅可操作性強(qiáng),而且精度高。其次利用GMAP.NET組件完成電子地圖的開發(fā),結(jié)合自由空間模型、Longley-Rice模型、Egli模型和Okumura-Hata模型設(shè)計(jì)并實(shí)現(xiàn)了簡(jiǎn)單的無線通信傳輸損耗預(yù)測(cè)和場(chǎng)強(qiáng)覆蓋范圍預(yù)測(cè)的仿真軟件。利用參考文獻(xiàn)中的實(shí)測(cè)數(shù)據(jù),進(jìn)行了電波傳輸損耗預(yù)測(cè)功能的驗(yàn)證。在北緯39°36'15.17"(即北緯39.604214),東經(jīng)116°16'38.34"(即東經(jīng)116.277316)處新建天線,進(jìn)行了場(chǎng)強(qiáng)和電波傳輸損耗覆蓋范圍預(yù)測(cè),并將預(yù)測(cè)結(jié)果與WRAP軟件的結(jié)果進(jìn)行比較,驗(yàn)證了該仿真軟件的準(zhǔn)確性和可靠性。本文仿真軟件的開發(fā)方法對(duì)國內(nèi)電磁仿真軟件開發(fā)具有一定的指導(dǎo)意義和參考價(jià)值。
[Abstract]:With the development of Belt and Road strategy, maritime trade will develop more quickly in the future. Therefore, it is necessary to further improve maritime public safety facilities and improve the quality of maritime wireless communications. The study of radio wave transmission loss at sea provides a good solution for better planning of base station distribution and is one of the main methods to improve the quality of offshore wireless communication. The research on wireless communication algorithms is of relatively low practical value. The electromagnetic simulation software imported from abroad, although the function is relatively perfect, but the maintainability is poor. Therefore, it is necessary to develop a simulation software which is suitable for the strong prediction of electromagnetic field in China. In this paper, the empirical model of radio wave transmission loss (mainly limited by carrier frequency, receiver / transmitter antenna height, communication link distance, etc.) is studied in this paper. Then BP BackPropagation (BP) network and GRNN generalized Regeneration Neural Network (generalized regression neural network) are used to predict the radio wave transmission loss in marine wireless communication. The results show that when the carrier frequency is 100 MHz, the average value of simulation error, standard deviation and root mean square error of GRNN are 0.98 dB ~ 0.16 dB and 0.86 dB ~ (600 MHz) lower than those of BP network respectively, and the results are 0.28 dB ~ 0.05 dB and 0.27 dB ~ (2 000 MHz) lower than those of BP network, respectively, and the results are 1.05 dB ~ 0.13 dB and 0.90 dB, respectively. At the same time, the simulation results of BP network and GRNN model are compared with those of Longley-Rice model, Egli model and Okumura-Hata model, respectively. The experimental results show that this method is not only feasible but also accurate. Secondly, GMAP.NET component is used to complete the development of electronic map. Combined with the free space model, Longley-Rice model Egli model and Okumura-Hata model, a simple simulation software for wireless communication transmission loss prediction and field intensity coverage prediction is designed and implemented. The prediction function of radio wave transmission loss is verified by using the measured data in reference. A new antenna is built at latitude 39 擄36C 15.17 "N (39.604214N) and longitude 116 擄1638.34" (116.277316 E). The field strength and radio wave transmission loss coverage range are predicted. The results are compared with those of WRAP software, and the accuracy and reliability of the simulation software are verified. The development method of the simulation software in this paper has certain guiding significance and reference value for the development of electromagnetic simulation software in China.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN011

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本文編號(hào)：2043753