卫星基带图像数据模拟源的设计与实现
发布时间：2018-09-11 07:28
【摘要】：卫星数据传输系统主要由星上发送系统和地面接收系统组成,由于星上发送系统的星上处理器设备容易受损且价格昂贵,为避免在卫星数传系统测试时对星上处理器进行频繁操作而造成损坏,需要设计一种星上有效载荷数据模拟源来替代星上有效载荷。随着遥感卫星的快速发展,遥感器数目和种类的增多,空间分辨率和时间分辨率的提高,所获得原始影像数据量越来越大,卫星图像进行高质量可控比的图像压缩以满足信道传输的容量,从而加大了地面接收系统的基带处理设备的研制工作。为了对地面基带处理设备进行系统验证和闭环测试,并且适应复杂多变的测试过程中对多种格式数据源的需求,设计和实现灵活产生所需格式的卫星基带数据模拟源对于地面接收系统的测试有着重要的意义。在对国内外卫星模拟源及数据传输技术发展现状分析的基础上,本文设计了一种新型的CCSDS-AOS标准的卫星基带图像数据模拟源,在Visual Studio 2010平台上采用纯软件方式进行实现,相比硬件方式实现,其人机交互界面参数配置灵活,系统运行稳定且实现成本低。该模拟源的图像压缩编码和基带同步与信道编码方式可选,其中图像压缩编码可实现压缩率可设的JPEG2000标准的图像压缩,基带同步与信道编码中的RS编码支持多种编码类型,加扰的初相和生成多项式可设,能够灵活地模拟产生地面基带数据处理设备所需格式的基带图像数据。本文首先对卫星基带传输时采用的AOS帧格式进行了分析,研究了JPEG2000图像压缩标准和卫星基带同步与信道编码中的CRC校验、RS编码、交织和加扰四种纠错编码。然后给出了卫星图像数据模拟源的系统设计与软件设计流程,在分析Kakadu编解码库的基础上实现了压缩率可控的JPEG2000图像压缩编码,并实现了功能适应性软件级优化;对基带同步与信道编码进行了详细的设计与实现,并给出了基带同步与信道编码中CRC校验、RS编码、交织和加扰的C++实现算法。最后对实现的卫星图像模拟源系统软件进行测试验证,主要对关键模块的功能分别进行了测试验证,并对系统总体功能和性能进行了测试。测试结果表明该模拟源可灵活地模拟产生多种特定帧格式的基带图像数据,为多功能卫星模拟源的设计与实现提供了基础的应用研究价值。
[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.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN919.6
本文编号：2236016
[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.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN919.6
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1 王振宇;基于JPEG2000的卫星图像压缩/解压技术[D];华中科技大学;2013年
，本文编号：2236016
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