收稿日期: 2010-03-29
修回日期: 2010-08-16
网络出版日期: 2010-09-26
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
Received date: 2010-03-29
Revised date: 2010-08-16
Online published: 2010-09-26
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
谭晓衡， 胡洋， 刘煜 . AM-AM变换对卫星跟踪和数据中继DOA估计的影响[J]. 应用科学学报, 2010 , 28(5) : 470 -475 . DOI: 10.3969/j.issn.0255-8297.2010.05.005
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.
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