南海無(wú)線電“白頻譜”占用度研究
發(fā)布時(shí)間：2018-11-14 07:31
【摘要】：為了服務(wù)于南海上數(shù)千萬(wàn)的漁民和各國(guó)往來(lái)船只,政府正著手在南海上實(shí)現(xiàn)無(wú)線網(wǎng)絡(luò)覆蓋。無(wú)線網(wǎng)絡(luò)的工作頻段選擇是實(shí)現(xiàn)海上無(wú)線網(wǎng)絡(luò)覆蓋工程的前提。海上無(wú)線傳播環(huán)境與陸地上無(wú)線信號(hào)傳播環(huán)境不同,海上基站建設(shè)困難、傳輸距離遠(yuǎn)、遮擋物少、濕度大、海水會(huì)反射和吸收電磁波、海水電導(dǎo)率、海洋表面風(fēng)速等因素都與陸地?zé)o線網(wǎng)絡(luò)覆蓋不同,在傳播距離足夠遠(yuǎn)時(shí),還要考慮地球的曲率半徑對(duì)電磁波的繞射影響等。為了適應(yīng)海上惡劣的無(wú)線電傳播環(huán)境,需要尋找不易被海水吸收、穿透力強(qiáng)、傳播距離遠(yuǎn)、信道容量大的頻段來(lái)作為無(wú)線網(wǎng)絡(luò)的工作頻段。 為了在匱乏的頻譜資源中尋找南海無(wú)線網(wǎng)絡(luò)的可用頻段,了解南海區(qū)域在VHF/UHF頻段的占用情況,現(xiàn)對(duì)該頻段在南海部分海域及島嶼上的占用度進(jìn)行了測(cè)量研究,分析了該頻段的頻譜占用度信息,實(shí)測(cè)數(shù)據(jù)表明,700MHz頻段在所測(cè)量海域范圍內(nèi)隨著遠(yuǎn)離海岸而明顯降低,在距離約10km的地方廣播電視信號(hào)就很弱了,甚至淹沒(méi)在背景噪聲中,由此可以推測(cè),在距離更遠(yuǎn)的南海海域上,該頻段的占用度幾乎為零,因此,該頻段在時(shí)間和地域上分布都是不均勻的,并且有大部分頻段是空閑的。另一方面,由于廣播電視發(fā)展較早,信息傳輸量大,因此采用了電磁頻譜中的黃金頻段,目前廣電部門(mén)正在進(jìn)行模擬電視向數(shù)字電視的轉(zhuǎn)換,等完成整體轉(zhuǎn)換后,廣電將讓出部分頻譜用于無(wú)線寬帶的發(fā)展,因此,可以對(duì)該頻段進(jìn)行復(fù)用來(lái)實(shí)施海洋無(wú)線網(wǎng)絡(luò)的覆蓋工程。
[Abstract]:To serve tens of millions of fishermen and ships across the South China Sea, the government is working on wireless coverage in the South China Sea. The selection of working frequency band of wireless network is the premise of the marine wireless network coverage project. The marine wireless transmission environment is different from the terrestrial wireless signal transmission environment, the base station at sea is difficult to build, the transmission distance is long, the occlusion is less, the humidity is high, the sea water will reflect and absorb the electromagnetic wave, the sea water conductivity, The wind speed of ocean surface is different from that of terrestrial wireless network. When the distance is long enough, the influence of the radius of curvature of the earth on the diffraction of electromagnetic wave should be considered. In order to adapt to the bad radio transmission environment at sea, it is necessary to find the frequency band which is difficult to be absorbed by sea water, strong penetration, long propagation distance and large channel capacity to work as the frequency band of wireless network. In order to find out the available frequency band of the South China Sea wireless network in the scarce spectrum resources and to understand the occupation of the South China Sea region in the VHF/UHF frequency band, the occupancy of the frequency band in some parts of the South China Sea and on the islands has been measured and studied. The spectrum occupancy information of the frequency band is analyzed. The measured data show that the 700MHz band decreases obviously with the distance from the coast in the sea area measured, and the radio and television signal is weak at a distance of about 10km, and even submerged in the background noise. It can be inferred that the occupation of the frequency band is almost zero in the farther South China Sea. Therefore, the frequency band is unevenly distributed in time and region, and most of the frequency band is idle. On the other hand, because of the earlier development of radio and television and the large amount of information transmission, the golden frequency band in the electromagnetic spectrum has been adopted. At present, the radio and television departments are currently carrying out the conversion from analog television to digital television, and so on, after the overall conversion, Radio and television will release part of the spectrum for the development of wireless broadband, so the frequency band can be multiplexed to implement the marine wireless network coverage project.
【學(xué)位授予單位】：海南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN92
本文編號(hào)：2330480
[Abstract]:To serve tens of millions of fishermen and ships across the South China Sea, the government is working on wireless coverage in the South China Sea. The selection of working frequency band of wireless network is the premise of the marine wireless network coverage project. The marine wireless transmission environment is different from the terrestrial wireless signal transmission environment, the base station at sea is difficult to build, the transmission distance is long, the occlusion is less, the humidity is high, the sea water will reflect and absorb the electromagnetic wave, the sea water conductivity, The wind speed of ocean surface is different from that of terrestrial wireless network. When the distance is long enough, the influence of the radius of curvature of the earth on the diffraction of electromagnetic wave should be considered. In order to adapt to the bad radio transmission environment at sea, it is necessary to find the frequency band which is difficult to be absorbed by sea water, strong penetration, long propagation distance and large channel capacity to work as the frequency band of wireless network. In order to find out the available frequency band of the South China Sea wireless network in the scarce spectrum resources and to understand the occupation of the South China Sea region in the VHF/UHF frequency band, the occupancy of the frequency band in some parts of the South China Sea and on the islands has been measured and studied. The spectrum occupancy information of the frequency band is analyzed. The measured data show that the 700MHz band decreases obviously with the distance from the coast in the sea area measured, and the radio and television signal is weak at a distance of about 10km, and even submerged in the background noise. It can be inferred that the occupation of the frequency band is almost zero in the farther South China Sea. Therefore, the frequency band is unevenly distributed in time and region, and most of the frequency band is idle. On the other hand, because of the earlier development of radio and television and the large amount of information transmission, the golden frequency band in the electromagnetic spectrum has been adopted. At present, the radio and television departments are currently carrying out the conversion from analog television to digital television, and so on, after the overall conversion, Radio and television will release part of the spectrum for the development of wireless broadband, so the frequency band can be multiplexed to implement the marine wireless network coverage project.
【學(xué)位授予單位】：海南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN92
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，本文編號(hào)：2330480
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