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应用科学学报 ›› 2010, Vol. 28 ›› Issue (5): 470-475.doi: 10.3969/j.issn.0255-8297.2010.05.005

• 通信工程 • 上一篇    下一篇

AM-AM变换对卫星跟踪和数据中继DOA估计的影响

谭晓衡， 胡洋， 刘煜   

  1. 重庆大学通信与测控中心，重庆400030
  • 收稿日期:2010-03-29 修回日期:2010-08-16 出版日期:2010-09-26 发布日期:2010-09-26
  • 作者简介:作者简介：谭晓衡，博士，教授，研究方向：移动通信、扩频技术及码分多址通信等，E-mail: txh@cqu.edu.cn
  • 基金资助:

    基金项目：国家自然科学基金(No.61001089)；重庆市自然科学基金(No.2010BB2049)资助

Effects of AM-AM Conversion on DOA Estimation in Tracking and Data Relay Satellite System

TAN Xiao-heng, HU Yang, LIU Yu   

  1. Center of Communication and Tracking Telemetering and Command, Chongqing University, Chongqing 400030, China
  • Received:2010-03-29 Revised:2010-08-16 Online:2010-09-26 Published:2010-09-26

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1701

被引次数

3

摘要：

摘要： 在跟踪和数据中继卫星系统反向链路中，多路频分复用信号通过高功率放大器时存在严重的交调干扰，导致输出的各路阵元信号严重失真. 针对这一问题，该文通过幂级数模型分析高功率放大器调幅-调幅(AM-AM)变换对通道间幅度一致性的影响机理，建立幅度不一致性对波达方向(direction of arrival, DOA) 估计影响的数学模型，并进行计算机仿真. 理论分析和仿真结果表明：高功率放大器的AM-AM变换不会引起估计角度的偏移，但会导致空间角度范围内的谱峰值降低，同时使3 dB 谱宽变宽. 此外，AM-AM变换还会导致DOA估计性能恶化.

关键词: 跟踪和数据中继卫星系统, 波达方向, AM-AM变换, 高功率放大器, 幅度不一致性

Abstract:

In the reverse link of tracking and data relay satellite system (TDRSS), AM-AM conversion in the high-power amplifier for frequency-division multiplexing (FDM) signals causes severe inter-modulation interference to the signals in different channels. The interference results in distortion of the channel signals. The present work uses power series to analyze the influence of AM-AM conversion on the amplifier’s magnitude consistency among the channels, and establish a mathematical model of the influence of magnitude inconsistency on DOA estimation. Theoretical analysis and simulation results show that AM-AM conversion in high-power amplifier does not affect the offset of the estimated angle, but reduces the spectral peak within the spatial angle and increases the 3 dB bandwidth. AM-AM conversion also deteriorates the DOA estimation performance.

Key words: tracking and data relay satellite system (TDRSS),, direction of arrival (DOA), , AM-AM conversion, , high-power amplifier, , magnitude inconsistency

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