摘要
星间链路的高动态给星间扩频信号带来高达几百kHz的多普勒频偏,本文提出一种利用卫星历书进行多普勒预估计与码域并行捕获相结合实现星间扩频信号捕获的算法。同时,常规的高斯白噪声下捕获概率分析对空间电磁脉冲不具有针对性,本文利用Possion分布对空间电磁脉冲干扰进行建模,对该并行捕获的捕获概率、捕获时间的影响进行了研究,表明该算法在信干比为-7.4dB时,捕获概率仍在90%以上,适于星间扩频信号的捕获。
The highly dynamic signal of inter-satellite-link communication usually results in large DOPPLER shift which may reach hundreds of kHz.An algorithm used to capture inter-satellite spread spectrum signal is presented in this paper by combining code domain acquisition in parallel with DOPPLER pre-estimation using the satellites＇ almanac.Meanwhile,the conventional analysis of Gaussian white noise capture probability to treat pulsed interference in space does not apply.Thus,pulsed interference in space is modeled as Possion distribution in this paper.The impacts under pulsed interference on acquisition probability,acquisition time of the algorithm are also studied.The simulation results indicate that the acquisition probability is still above 90% while signal to interference ratio is-7.4dB,and the algorithm is suitable for inter-satellite-link spread-spectrum signal acquisition.
出处
《航天控制》
CSCD
北大核心
2010年第5期35-39,共5页
Aerospace Control
关键词
星间通信
码域并行捕获
泊松分布
脉冲干扰
Inter-satellite-link communication
Code-acquisition in parallel
Possion distribution
Pulsed interference
