摘要
由于发送端和接收端时钟的不一致性,导致低信噪比下阵列天线卫星移动通信的逐通道相关标校有很大的难度。在考虑易实现性和简易性基础上,提出了一种可以解决低信噪比下通道校正的多周期长时累积方法。该校准信号为由地面标校站产生的BPSK调制扩频信号,可以减少卫星设计的复杂度,且在不中断用户数据传输的基础上实现在线标校。该方法通过对接收信号打标、速率匹配等措施来解决收发时钟不一致导致的码偏和频偏问题。研究结果可以为阵列天线卫星通信技术提供支持。
Due to the clock-frequency difference between the transmitter and the receiver, it is difficult for the multi-antenna satellite mobile communication channel-calibration in low signal noise ratiol （SNR）. An on-line individual channel multi-cycle inter-accumulation method was proposed, which could solve the difficulty of channel-calibration in low SNR. This calibration spread-spectrum signal was produced from ground calibration-station, which could reduce the complexity of satellite design and realize on-line calibration without interrupting the communication for users. This method solves the problem of code offset and frequency offset through marking the valid data, matching rate, and so on. The results show that the SNR is --30dB under the spreading radio of 1023, which is 0. 3 dB worse than that of the theory SNR. The study can provide technical support for the multi- antenna satellite mobile communication.
出处
《中国空间科学技术》
EI
CSCD
北大核心
2015年第6期75-81,共7页
Chinese Space Science and Technology
关键词
阵列信号
标校
频偏
码偏
多周期累积
Array signal
Calibration
Frequency offset
PN code offset
Multi-cycle accumulation
