高动态猝发扩频信号低复杂度快速捕获技术

High Dynamic Burst Spread Spectrum Signal Low Complexity Rapid Acquisition Technology

研究超高速飞行器组网的猝发扩频信号快速捕获技术,与卫星导航等传统卫星通信系统相比,其飞行器的动态更大,使用的载波频率更高,使得多普勒特性增加了一个数量级以上,对扩频信号捕获算法的搜索带宽和捕获时间都提出了更高的要求。针对上述需求,对已有的双块补零捕获算法(DBZP)进行改进,通过调整优化算法的分块方案和参数设置获取更大的多普勒频偏搜索范围。同时提出了列压缩算法,显著减低算法的计算复杂度。通过仿真证明了改进的双块补零算法能成功捕获高动态的猝发信号,并且通过仿真和计算分析得到了适用于高动态猝发信号的双块补零最优列压缩比。

This paper studies the rapid acquisition technology of burst spread spectrum signals for ultra-high-speed aircraft networking. Compared with traditional satellite communication systems such as satellite navigation, the aircraft is more dynamic and uses a higher carrier frequency, which increases its Doppler characteristics by an order of magnitude. Higher requirements are put forward for the search range and acquisition time of the spread spectrum signal acquisition algorithm. In response to these requirements, this paper improves the existing double block zero-padding acquisition algorithm(DBZP) and obtains a larger Doppler frequency offset search range by adjusting the blocking scheme and parameter settings of the optimized algorithm. At the same time, the column compression algorithm is introduced when the double block zero-padding algorithm calculates the Doppler frequency offset, which significantly reduces the computational complexity of the algorithm. It is proved by simulation that the improved double block zero-padding algorithm can successfully capture high-dynamic burst signals, and the optimal column compression ratio of double block zero-padding suitable for high-dynamic burst signals is obtained through simulation and calculation analysis.