本文選題：船載衛(wèi)星通信地球站　切入點(diǎn)：嵌入式系統(tǒng)　出處：《南京郵電大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：由于我國的海域遼闊，建立有線的通信網(wǎng)絡(luò)成本過高、周期過長(zhǎng)而難以實(shí)現(xiàn)，因此在海上覆蓋有線網(wǎng)絡(luò)不切實(shí)際。隨著近年來衛(wèi)星通信技術(shù)快速發(fā)展，在海船上安裝動(dòng)中通移動(dòng)通信終端，通過借助地球同步衛(wèi)星建立海上盲區(qū)通信鏈路，滿足了軍事、民用等海上通信的迫切需要，因此船載天線的存在對(duì)海上通信存在巨大意義。在海上航行中，，由于地理位置與環(huán)境的變化、船的航向改變以及船體的搖擺帶來的擾動(dòng)，導(dǎo)致船載衛(wèi)星通信地球站波束中心的方向偏離通信衛(wèi)星，地球站接收和發(fā)送的衛(wèi)星信號(hào)不能達(dá)到最優(yōu)的狀態(tài)，甚至可能出現(xiàn)通信中斷的情況。與大型固定站與便攜站不同的是，船載衛(wèi)星通信地球站的開發(fā)必須隔離載體擾動(dòng)，使天線波束中心始終對(duì)準(zhǔn)通信衛(wèi)星。 近年來隨著嵌入式技術(shù)的飛速發(fā)展，ARM32位嵌入式RISC處理器以其低功耗、低成本、高性能的特性，在嵌入式系統(tǒng)應(yīng)用領(lǐng)域占據(jù)領(lǐng)先地位。本課題主要是把原有的船載衛(wèi)星通信地球站從基于單片機(jī)的控制平臺(tái)升級(jí)為基于ARM9芯片的平臺(tái)，從三方面進(jìn)行了研究：一，基于ARM9的硬件電路設(shè)計(jì)，主要介紹了系統(tǒng)的各個(gè)模塊芯片、器件的選擇與電路設(shè)計(jì)；二，搭建嵌入式ARMLinux的開發(fā)平臺(tái)，根據(jù)平臺(tái)需要移植bootloader、linux內(nèi)核、驅(qū)動(dòng)以及構(gòu)建根文件系統(tǒng)等；三，根據(jù)船載衛(wèi)星通信地球站系統(tǒng)要求編寫伺服控制程序，并介紹程序的執(zhí)行過程。 此課題的目標(biāo)是讓該控制系統(tǒng)實(shí)現(xiàn)驅(qū)動(dòng)各路電機(jī)轉(zhuǎn)動(dòng)，通過各傳感器數(shù)據(jù)采集并反饋給系統(tǒng)，實(shí)現(xiàn)船載衛(wèi)星通信地球站的自動(dòng)對(duì)星與穩(wěn)定跟蹤。目前該系統(tǒng)已設(shè)計(jì)完成，實(shí)現(xiàn)了控制系統(tǒng)的升級(jí)。
[Abstract]:Because of the vast sea area of our country, the cost of establishing the wired communication network is too high, the period is too long and it is difficult to realize it, so it is impractical to cover the wired network at sea. With the rapid development of satellite communication technology in recent years, The installation of mobile communication terminals on board ships, and the establishment of maritime blind area communication links by means of geostationary satellites, meet the urgent needs of military, civilian and other maritime communications. Therefore, the existence of shipborne antenna is of great significance to maritime communication. In maritime navigation, due to the change of geographical position and environment, the ship's course changes and the disturbance caused by the ship's swaying. As a result, the direction of the beam-center of the shipborne satellite communication earth station deviates from the communication satellite, the satellite signal received and transmitted by the earth station cannot reach the optimal state, and even the communication may be interrupted. Unlike the large fixed station and the portable station, it is different from the large fixed station and the portable station. In the development of shipborne satellite communication earth station, the carrier disturbance must be isolated so that the antenna beam center is always aligned with the communication satellite. In recent years, with the rapid development of embedded technology, ARM32-bit embedded RISC processor is characterized by its low power consumption, low cost and high performance. This subject is to upgrade the original shipborne satellite communication earth station from the control platform based on SCM to the platform based on ARM9 chip. The hardware circuit design based on ARM9 mainly introduces each module chip, device selection and circuit design of the system. Secondly, the development platform of embedded ARMLinux is built, the kernel of bootloader Linux is transplanted according to the platform requirement, the driver and the root file system are built. Thirdly, the servo control program is written according to the requirements of shipborne satellite communication earth station system, and the execution process of the program is introduced. The goal of this project is to make the control system drive all kinds of motor rotation, collect and feed back to the system through the data of each sensor, realize the automatic tracking of satellite communication earth station on board the ship, the system has been designed and completed at present. The upgrade of control system is realized.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TN828.5;TP368.12

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