摘要
为准确获取短波信道探测信号的多普勒频移,把被Zadoff-Chu序列调制的信号作为探测信号,以简化的Watterson模型作为短波信道,采用脉冲压缩技术,对多普勒频移的计算进行了理论推导,得出了一种多普勒频移的计算公式,对两条路径时公式的计算结果进行了仿真。结果表明,在两条路径的多普勒频移相差小于±0.3 Hz时,计算结果较为准确。在此基础上,仿真分析了多普勒频移对Zadoff-Chu序列的脉冲压缩的影响。分析表明,小于10 Hz的多普勒频移对Zadoff-Chu序列的脉冲压缩的影响可以忽略不计,将该序列应用在短波信道探测中比较合适。
For the purpose of exact measurement of Doppler shift, based on the pulse compression technique, this paper did the theoretical deduction of the calculation Of Doppler shift, in which the signal modulated by Zadoff-Chu sequence was used as the sounding signal and a simplified Watterson model was used as the HF channel. It obtained a calculation formula of Doppler shift, carried out the simulation of the calculation result of the formula for the case of two paths. The simulation results show that the calculation result of the formula is right when the Doppler difference of the two paths is less than ± 0. 3 Hz. On the basis of this, made the simulation of Doppler shift＇ s effect on the pulse compression of Zadoff-Chu sequence. The results show that the effect of the Doppler shift which is less than 10 Hz is negligible, which affirms that ZadoffoChu sequence is an appropriate sequence for HF channel sounding.
出处
《计算机应用研究》
CSCD
北大核心
2012年第3期1070-1072,共3页
Application Research of Computers
