摘要
针对直升机旋翼遮挡对卫星信号传输的影响,分析了信号遮挡与接收电平衰减的关系,提出了一种信号传输帧结构设计,并且对该帧结构信号的捕获能力和频率跟踪做了详细的分析。理论推导和仿真表明,具备该传输帧结构特点的信号在归一化频偏小于1/32、符号信噪比大于3 d B的条件下,信号的捕获概率为100%,虚警概率小于1%,且具有较高的频率跟踪精度。
Aiming at the influence of helicopter rotor blockage on satellite signal transmission,the relationship between signalblockage and receiving level attenuation is analyzed,and the structure of transmission frame is designed. The capture and frequency tracking of the signals having this structure of transmission frame is analyzed in detail. Analysis and simulation indicate that,under the condition that the normalized frequency deviation is less than 1 / 32 and signal-to-noise ratio is greater than 3 dB, the acquisition probability of the signal model having this structure of transmission frame is 100%,the false alarm probability is less than 1%,and moreover,the frequency tracking is accomplished precisely.
作者
魏瑞刚
WEI Ruigang(The 54th Research Institute of CETC, Shijiazhuang 050081, China)
出处
《无线电工程》
2018年第6期516-520,共5页
Radio Engineering
基金
国家部委基金资助项目
关键词
卫星通信
帧结构
频率跟踪
旋翼遮挡
satellite communication
frame structure
frequency tracking
rotor blockage
