摘要
宽带柔性转发器具有多体制支持能力强、链路连接灵活可变、频率规划在轨按需可变的突出特点,是满足未来宽带卫星发展需求的一类核心载荷,其核心部分采用了近似完美重构的数字信道化技术。对两种主流的数字信道化算法进行了仿真比较,并针对一种子带滤波器的要求,提出了两种实现方法:子带拼接法和直接信道化法,并以Xilinx公司Virtex-4系列的V4SX55型FPGA为例,对两种方法的FPGA资源占用情况进行了对比,给出了两种方法各自适合的应用场景。结果表明,当信道化路数≤256时,应使用子带拼接法;当信道化路数≥512,且<2048时,两种方法均可应用;当信道化路数≥2048时,则只能应用直接信道化法。
Wideband flexible transponder has some obvious features such as supporting a variety of satellite communications air interfaces and constructing flexible satellite-terrestrial link connections.Furthermore,it could change frequency planning on-orbit based on different requirements. Hence it is a type of key payload which satisfies the requirements of future Wideband communications satellites.The key technology of wideband flexible transponder is the digital channelizer,which is based on the algorithm of near-perfect reconstruction. In this paper,to meet with the sub-band filter requirement,two implement methods,named sub-band concatenating and direct channelization,were designed based on two common methods and their performance comparison was provided via simulations.The FPGA resources consumptions of the two methods were further proposed,in which the Xilinx Virtex-4 V4 SX55 FPGA were assumed to be adopted. Based on the comparison results,the suitable application scenarios for the two methods were suggested respectively.Simulation results confirm that when the number of sub-channels is less than or equal to 256,those filters with sub-band concatenating could be used,and when the number is greater than or equal to 512 and less than 2048,both types of filters could be adopted,and particularly,when the number is greater than or equal to 2048,those filters with direct channelization should be employed.
作者
张鹏
张宁
张映南
孙垂强
马楠
ZHANG Peng;ZHANG Ning;ZHANG Yingnan;SUN Chuiqiang;MA Nan(China Academy of Space Technology（Xi＇an）, Xi＇an 710000,China)
出处
《空间电子技术》
2018年第1期48-53,共6页
Space Electronic Technology
