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一种遥感卫星高码速VCM数传信道的均衡技术
朱文杰,陈金树
0
(清华大学 电子工程系,北京 100084)
摘要:
在基于第二代数字卫星视频广播协议(DVB-S2)标准的遥感卫星可变编码调制(VCM)高码速数传信道中,宽带信号的大失真、大频偏和低信噪比会导致解调器载波环路不锁定。传统的DVB-S2解调器并不能解决这个问题。在载波环路前增加一个均衡器补偿失真,可以让载波环路稳定锁定。为了克服载波环路前信号的频偏和相偏对均衡器的影响,提出了一种均衡技术,利用起始序列(SOF)和导频的先验信息进行双重自相关变换,设计了一种新的误差函数和迭代过程。仿真结果表明,该均衡技术可在该应用条件下支持解调稳定工作。
关键词:  遥感卫星  数传信道  载波环路  可变编码调制
DOI:
基金项目:国家民用空间基础设施中长期发展规划(2015—2025年)高分七号项目(GXTC-1761089)
An equalization technique for VCM data transmission channel of remote sensing satellite with high data rate
ZHU Wenjie,CHEN Jinshu
(Department of Electronic Engineering,Tsinghua University,Beijing 100084,China)
Abstract:
In European Digital Video Broadcasting-Satellite Second Generation(DVB-S2) based high-data-rate remote sensing satellite variable coding and modulation(VCM) data transmission channel,the high channel distortion introduced by broadband channel,high frequency offset and low signal-to-noise ratio(SNR) makes the carrier loop unlock.The conventional DVB-S2 based demodulator can′t solve the problem.Placing an equalizer ahead of the carrier loop can compensate the distortion and stabilize the carrier loop.In consideration of the impact of frequency offset and phase offset on the equalizer,an equalization technique is proposed.It adopts self-correlation transform of prior information with a new error function and iteration process.The prior information comes from start of frames(SOF) and pilot.The simulation verifies that the new equalization technique supports the stable work of demodulation in this application.
Key words:  remote sensing satellite  data transmission channel  carrier loop  variable coding and modulation
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