面向低轨卫星的低资源大带宽自适应成形滤波设计  

Design of Low-resource and High-bandwidth Adaptive Shape Filtering for Low-orbit Satellites

作　　者：宋艳军[1] 张静[1] SONG Yanjun;ZHANG Jing(The 54th Research Institute of CETC,Shijiazhuang 050081,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电通信技术》2024年第4期750-757,共8页Radio Communications Technology

摘　　要：由于低轨卫星通信过程中信号电平动态变化较大,为了提高信道利用率系统需要根据通信链路情况自动控制传输速率。为保证系统通信不中断,满足实时通信的需求,提出了一种面向低轨卫星的低资源大带宽新型成形滤波器设计方法,该方法采用并行多相级联积分梳状(Cascade Integrator Comb, CIC)滤波器的方式设计成形滤波器,能够实现几百kHz至几百MHz大带宽信号的成形,解决高、中、低速信号自适应连续成形滤波问题。相比传统成形滤波器的高速信号处理能力提高了8倍,能节省乘法器资源95%以上,适应低轨卫星通信场景下星载处理使用。仿真结果表明该滤波器对信号的成形效果和带外抑制情况与传统滤波器几乎一致。During the communication process of low-orbit satellites,the signal level undergoes significant dynamic changes.In order to improve channel utilization,the system needs to automatically control the transmission rate based on link conditions.This paper proposed a new design method of low resource and large bandwidth shaping filter for low-orbit satellites,that ensure uninterrupted system communication and meet real-time communication requirement.The method adopts a parallel multiphase cascaded Cascade Integrator Comb(CIC)to design shaping filters,which can achieve shaping of large bandwidth signals from hundreds of kHz to hundreds of MHz,and solve the problem of adaptive continuous shaping filtering for high,medium,and low speed signals.Compared to traditional shaping filters,the filter has 8 times higher high-speed signal processing capability and can save more than 95%of multiplier resources.Simulation results show that the shaping effect and out of band suppression of the filter on the signal are almost consistent with traditional filters.

关 键 词：低轨卫星 多相滤波 级联积分梳状滤波器 自适应成形滤波 

分 类 号：TN927[电子电信—通信与信息系统]