摘要
介绍了用于深空通信的天线组阵技术中常用的SIMPLE和SUMPLE信号合成算法。根据远距离天线组阵的特点,采用符号流合成(SSC)方法对信号进行合成,用快速傅里叶变换(FFT)实现信号互相关来自适应地消除时差,用最小均方(LMS)误差算法实现最大比合成(MRC)。仿真结果表明:可实现300Mbit/s数据速率的信号接收,信号合成增益相对于理论增益损失在0.3dB以内,系统在信噪比(SNR)为-3dB的条件下仍能正常工作。文章采用的方法,可用于远距离非均匀天线组阵,也可用于具有较高数据传输速率的航天器通信。
This paper describes the SUMPLE and SIMPLE signal combining algorithms of antenna arraying technologies for deep space communications, and adapts the method of SSC （symbol stream combining） for signal combination based on the characteristics of long-distance antenna arraying technology. It adaptively eliminates time-delay by using the method of signal cross-cor- relation which is achieved by FFT and by using MRC （max ratio combination） method which is achieved by LMS for signal combination. Simulation results show that the combining gain of this method compared with the theoretical value has 0.3dB loss, the system can still work under the condition of --3dB SNR, it can receive signal with 300Mbit/s rate. The method proposed in this paper can be used for long-distance non-uniform antenna arraying, and can be used for satellite communication at a higher data transmission rate as well.
出处
《航天器工程》
2013年第5期93-97,共5页
Spacecraft Engineering
基金
高分辨率对地观测系统重大专项(GFZX04040203)
关键词
空间通信
天线组阵
信号合成
时差估计
符号同步
space communication
antenna arraying~ signal combination
time-delay estimationsymbol synchronization
