16APSK在高速数传系统中的应用分析  

Application Analysis of 16APSK in High-speed Data Transmission System

作　　者：李超[1] 赵超 崔锋 刘鹏飞 周梦竹 曹斐 张宇超 高杰[1] 张茂鹏 LI Chao;ZHAO Chao;CUI Feng;LIU Pengfei;ZHOU Mengzhu;CAO Fei;ZHANG Yuchao;GAO Jie;ZHANG Maopeng(The 54th Research Institute of CETC,Shijiazhuang 050081,China;State Key Laboratory of Astronautic Dynamics,Xi'an 710043,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 [2]宇航动力学国家重点实验室,陕西西安710043

出　　处：《无线电通信技术》2025年第1期177-186,共10页Radio Communications Technology

摘　　要：在Ka频段星地高速数传系统中,地面接收到的16APSK信号功率较高。但是在实际应用中,随着16APSK信号带宽的提高,信道群时延失真产生的等效信噪比降低,将导致信号载波失锁,进而导致信号帧同步失锁。针对以上问题,开展中频环与射模环信号接收试验,并对试验结果进行比对总结。在分析高速数传解调原理与测试Ka频段信道群时延失真的基础上,初步总结了当前16APSK星座映射的局限性。分别对3种16APSK星座映射的抗噪声特性、载波频偏估计门限、载波相位稳态误差和抗信道群时延失真4个方面进行详细仿真分析,得出在星地高速数传系统中,信道群时延失真对不同16APSK星座映射信号解调将产生不同程度的影响,当前星地高速数传系统中应用的16APSK星座映射信号对信道群时延失真的适应性较差,在信号接收解调时,需要对群时延失真进行针对性设计,以满足信号接收的需要。In the Ka frequency band satellite ground high-speed data transmission system,the ground received 16APSK signal has a higher power.However,in practical applications,as the bandwidth of the 16APSK signal gradually increases,the equivalent signal-to-noise ratio caused by channel group delay distortion decreases,which will cause the signal carrier to lose lock and subsequently lead to the signal frame synchronization to lose lock.To address above issues,first,signal reception tests were conducted on the intermediate frequency loop and RF analog source loop,and the test results were compared and summarized.Then,based on the analysis of the principle of high-speed data transmission demodulation and the testing of Ka band channel group delay distortion,the limitations of the current 16APSK constellation mapping were preliminarily summarized.For this purpose,detailed simulation analysis was conducted on the anti-noise characteristics,carrier frequency offset estimation threshold,carrier phase steady-noise error,and anti channel group delay distortion of three types of 16APSK constellation mappings.Finally,it was found that in satellite ground high-speed data transmission systems,channel group delay distortion will have varying degrees of impact on the demodulation of different 16APSK constellation mapping signals.Currently,the 16APSK constellation mapping signals used in satellite ground high-speed data transmission systems have poor adaptability to channel group delay distortion.During signal reception and demodulation,it is necessary to design specifically for group delay distortion to meet the requirement of signal reception.

关 键 词：16APSK 半径比 载波恢复 群时延 

分 类 号：TN911[电子电信—通信与信息系统]