【摘要】：衛(wèi)星數(shù)據(jù)傳輸系統(tǒng)主要由星上發(fā)送系統(tǒng)和地面接收系統(tǒng)組成,由于星上發(fā)送系統(tǒng)的星上處理器設(shè)備容易受損且價格昂貴,為避免在衛(wèi)星數(shù)傳系統(tǒng)測試時對星上處理器進(jìn)行頻繁操作而造成損壞,需要設(shè)計一種星上有效載荷數(shù)據(jù)模擬源來替代星上有效載荷。隨著遙感衛(wèi)星的快速發(fā)展,遙感器數(shù)目和種類的增多,空間分辨率和時間分辨率的提高,所獲得原始影像數(shù)據(jù)量越來越大,衛(wèi)星圖像進(jìn)行高質(zhì)量可控比的圖像壓縮以滿足信道傳輸?shù)娜萘?從而加大了地面接收系統(tǒng)的基帶處理設(shè)備的研制工作。為了對地面基帶處理設(shè)備進(jìn)行系統(tǒng)驗證和閉環(huán)測試,并且適應(yīng)復(fù)雜多變的測試過程中對多種格式數(shù)據(jù)源的需求,設(shè)計和實現(xiàn)靈活產(chǎn)生所需格式的衛(wèi)星基帶數(shù)據(jù)模擬源對于地面接收系統(tǒng)的測試有著重要的意義。在對國內(nèi)外衛(wèi)星模擬源及數(shù)據(jù)傳輸技術(shù)發(fā)展現(xiàn)狀分析的基礎(chǔ)上,本文設(shè)計了一種新型的CCSDS-AOS標(biāo)準(zhǔn)的衛(wèi)星基帶圖像數(shù)據(jù)模擬源,在Visual Studio 2010平臺上采用純軟件方式進(jìn)行實現(xiàn),相比硬件方式實現(xiàn),其人機(jī)交互界面參數(shù)配置靈活,系統(tǒng)運行穩(wěn)定且實現(xiàn)成本低。該模擬源的圖像壓縮編碼和基帶同步與信道編碼方式可選,其中圖像壓縮編碼可實現(xiàn)壓縮率可設(shè)的JPEG2000標(biāo)準(zhǔn)的圖像壓縮,基帶同步與信道編碼中的RS編碼支持多種編碼類型,加擾的初相和生成多項式可設(shè),能夠靈活地模擬產(chǎn)生地面基帶數(shù)據(jù)處理設(shè)備所需格式的基帶圖像數(shù)據(jù)。本文首先對衛(wèi)星基帶傳輸時采用的AOS幀格式進(jìn)行了分析,研究了JPEG2000圖像壓縮標(biāo)準(zhǔn)和衛(wèi)星基帶同步與信道編碼中的CRC校驗、RS編碼、交織和加擾四種糾錯編碼。然后給出了衛(wèi)星圖像數(shù)據(jù)模擬源的系統(tǒng)設(shè)計與軟件設(shè)計流程,在分析Kakadu編解碼庫的基礎(chǔ)上實現(xiàn)了壓縮率可控的JPEG2000圖像壓縮編碼,并實現(xiàn)了功能適應(yīng)性軟件級優(yōu)化;對基帶同步與信道編碼進(jìn)行了詳細(xì)的設(shè)計與實現(xiàn),并給出了基帶同步與信道編碼中CRC校驗、RS編碼、交織和加擾的C++實現(xiàn)算法。最后對實現(xiàn)的衛(wèi)星圖像模擬源系統(tǒng)軟件進(jìn)行測試驗證,主要對關(guān)鍵模塊的功能分別進(jìn)行了測試驗證,并對系統(tǒng)總體功能和性能進(jìn)行了測試。測試結(jié)果表明該模擬源可靈活地模擬產(chǎn)生多種特定幀格式的基帶圖像數(shù)據(jù),為多功能衛(wèi)星模擬源的設(shè)計與實現(xiàn)提供了基礎(chǔ)的應(yīng)用研究價值。
[Abstract]:The satellite data transmission system is mainly composed of onboard transmission system and ground receiving system, because the onboard processor equipment of the onboard transmission system is easily damaged and expensive. In order to avoid the damage caused by frequent operation of on-board processor during the test of satellite data transmission system, it is necessary to design an on-board payload data analog source to replace the on-board payload. With the rapid development of remote sensing satellites, the number and types of remote sensors increase, the spatial resolution and time resolution of remote sensing satellites increase, and the amount of original image data becomes larger and larger. Satellite images are compressed with high quality and controllable ratio to meet the capacity of channel transmission, thus increasing the development of baseband processing equipment for terrestrial reception system. In order to carry out system verification and closed-loop test of ground baseband processing equipment, and to meet the needs of multi-format data sources in complex and changeable testing process, It is very important to design and implement satellite baseband data analog source which can generate the required format flexibly for the test of ground receiving system. Based on the analysis of the current situation of satellite analog source and data transmission technology at home and abroad, a new CCSDS-AOS standard satellite baseband image simulation source is designed in this paper. It is realized on the platform of Visual Studio 2010 by pure software. Compared with hardware implementation, the man-machine interface parameter configuration is flexible, the system runs stably and the cost is low. The image compression coding and baseband synchronization and channel coding of the analog source are optional, in which image compression coding can realize the compression ratio of JPEG2000 standard image compression, and the RS coding in baseband synchronization and channel coding supports a variety of coding types. The initial phase and generating polynomial of scrambling can be set up to simulate the baseband image data flexibly in the format required by the ground baseband data processing equipment. In this paper, the AOS frame format used in satellite baseband transmission is analyzed, and four kinds of error-correcting codes, such as JPEG2000 image compression standard and CRC check RS coding, interleaving and scrambling coding in satellite baseband synchronization and channel coding are studied. Then the system design and software design flow of satellite image analog source are given. Based on the analysis of Kakadu codec library, JPEG2000 image compression coding with controllable compression rate is realized, and the functional adaptive software level optimization is realized. The base-band synchronization and channel coding are designed and implemented in detail, and the C realization algorithm of CRC check RS coding, interleaving and scrambling in baseband synchronization and channel coding is given. Finally, the software of the satellite image analog source system is tested and verified, the functions of the key modules are tested respectively, and the overall function and performance of the system are tested. The test results show that the analog source can flexibly simulate and generate a variety of baseband image data in a specific frame format, which provides the basic application research value for the design and implementation of the multifunctional satellite analog source.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN919.6

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本文編號：2236016