發(fā)布時(shí)間：2018-12-15 04:32

【摘要】：短波通信是無(wú)線電通信的一種,它利用頻率在3~30MHz(波長(zhǎng)為100~10m)范圍內(nèi)的電磁波進(jìn)行通信;具有通信距離遠(yuǎn)、不易被摧毀等特點(diǎn),是特定用戶遠(yuǎn)程通信的主要手段。短波頻率資源非常有限,而且容易受到電離層變化的影響,因此在短波通信中需要對(duì)頻率進(jìn)行合理的預(yù)測(cè)和指配。目前國(guó)內(nèi)外成型的軟件產(chǎn)品主要針對(duì)短波頻率進(jìn)行預(yù)測(cè),未實(shí)現(xiàn)頻率的指配。本文則基于此背景,開(kāi)發(fā)出了一套適合特定用戶的短波頻率預(yù)測(cè)及指配系統(tǒng)。本文根據(jù)特定用戶實(shí)際需求,針對(duì)其用頻設(shè)備數(shù)量多,分布集中的特點(diǎn),搭建實(shí)用的頻率預(yù)測(cè)和指配模型,并以此為基礎(chǔ)開(kāi)發(fā)出短波頻率預(yù)測(cè)及指配系統(tǒng)。主要研究?jī)?nèi)容及成果為:1.以國(guó)際電聯(lián)傳播模型(ITU-RP.1239、ITU-RP.1240)為主建立了實(shí)用的短波預(yù)測(cè)模型,并對(duì)可供使用的最佳頻段進(jìn)行EMC分析和電磁環(huán)境測(cè)試分析,在預(yù)測(cè)的基礎(chǔ)上建立短波頻率指配模型。彌補(bǔ)了國(guó)內(nèi)外同類(lèi)課題只能進(jìn)行短波頻率預(yù)測(cè),而未合理進(jìn)行頻率指配的缺陷。2.根據(jù)短波頻率預(yù)測(cè)模型和指配模型,采用C/S體系結(jié)構(gòu)、VC++開(kāi)發(fā)平臺(tái)、數(shù)據(jù)庫(kù)設(shè)計(jì)技術(shù),設(shè)計(jì)實(shí)現(xiàn)了基于短波頻率預(yù)測(cè)的頻率指配系統(tǒng)。系統(tǒng)分為短波頻率預(yù)測(cè)與指配、頻率資源管理、系統(tǒng)管理三大功能模塊。其中,短波頻率預(yù)測(cè)與指配功能模塊以向?qū)У姆绞揭龑?dǎo)用戶分步進(jìn)行短波頻率的預(yù)測(cè)和指配,最終以短波聯(lián)絡(luò)文件的形式確定頻率指配方案,供用戶查看和共享;頻率資源管理和系統(tǒng)管理功能模塊作為支撐模塊完成了短波頻率資源、用戶權(quán)限及其它數(shù)據(jù)信息的管理和維護(hù)。系統(tǒng)通過(guò)了測(cè)試和驗(yàn)證,各項(xiàng)功能和性能達(dá)到預(yù)期要求。目前已提交用戶試用,試用結(jié)果表明該系統(tǒng)實(shí)用性強(qiáng)、穩(wěn)定性高;能夠有效改善短波通信效果,滿足特定用戶的遠(yuǎn)距離通信需求。為滿足用戶不斷增長(zhǎng)的需求,下一步會(huì)在該系統(tǒng)中實(shí)現(xiàn)臺(tái)站數(shù)據(jù)和用頻設(shè)備數(shù)據(jù)的管理和維護(hù);并積極研究該系統(tǒng)與用戶頻率管理一體化系統(tǒng)的數(shù)據(jù)融合,提高軟件兼容性。
[Abstract]:Shortwave communication is a kind of radio communication, which uses electromagnetic wave in the range of 3~30MHz (wavelength 100m). It has the characteristics of long communication distance and is not easy to be destroyed. It is the main means of remote communication for specific users. Shortwave frequency resources are very limited and vulnerable to ionospheric changes, so it is necessary to reasonably predict and assign the frequency in HF communication. At present, the domestic and foreign moulded software products mainly predict the short wave frequency, but do not realize the frequency assignment. Based on this background, a short wave frequency prediction and assignment system is developed. In this paper, according to the actual needs of specific users, a practical frequency prediction and assignment model is built according to the characteristics of a large number of frequency-using equipment and concentrated distribution, and a short-wave frequency prediction and assignment system is developed on the basis of this model. The main research contents and results are as follows: 1. Based on the ITU propagation model (ITU-RP.1239,ITU-RP.1240), a practical shortwave prediction model is established, and EMC analysis and electromagnetic environment test analysis are carried out for the best frequency band available for use. A short wave frequency assignment model is established on the basis of prediction. It makes up for the defect that the same subject at home and abroad can only predict the frequency of short wave, but do not assign the frequency reasonably. 2. According to the short wave frequency prediction model and assignment model, a frequency assignment system based on short wave frequency prediction is designed and implemented by using C / S architecture, VC development platform and database design technology. The system is divided into three functional modules: short wave frequency prediction and assignment, frequency resource management and system management. The short wave frequency prediction and assignment function module guides the user to predict and assign the short wave frequency step by step, and finally determines the frequency assignment scheme in the form of the short wave contact file for the user to view and share. The function module of frequency resource management and system management is used as the supporting module to manage and maintain the shortwave frequency resources, user rights and other data information. The system has passed the test and verification, and the functions and performance meet the expected requirements. The trial results show that the system is practical and stable, and it can effectively improve the effect of shortwave communication and meet the requirements of long distance communication for specific users. In order to meet the increasing demand of users, the next step will be to realize the management and maintenance of station data and frequency equipment data in the system, and actively study the data fusion between the system and the user frequency management integration system to improve the software compatibility.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN925

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本文編號(hào)：2379982