一种短时猝发GMSK扩频多普勒估计算法研究

Research on A Short Burst GMSK Spread Spectrum Doppler Estimation Algorithm

摘要:

多普勒估计是猝发传输背景下的GMSK（Gaussian Filtered Minimum Shift Keying， 高斯最小频移键控）扩频通信系统接收端同步过程中的关键一环。针对短时猝发GMSK扩频通信系统信息传输时间极短的特点，搭建了系统接收端同步段结构，并以此为基础设计了适应该短时猝发同步段结构的多普勒估计算法，建立了短时猝发多普勒估计算法模型，推导该算法公式的同时对算法模型进行了理论分析，详细阐述了该算法进行多普勒估计的实现过程，并对该算法进行仿真实验。实验结果表明，该算法在信噪比为1 dB时，多普勒估计准确度可达到97.2%，信噪比≥3 dB时，准确度均能在99%及以上，该结果验证了该算法应用在猝发传输背景下的GMSK扩频通信系统中的有效性、可行性，同时也表明当通信系统处于弱信号的条件下时，该多普勒估计算法性能依然能达到一个较为优异的准确度值。

Abstract:

Doppler estimation is a key link in the synchronization process of GMSK spread spectrum communication system receivers in the context of burst transmission. Given the extremely short information transmission time associated with short-duration burst GMSK spread spectrum communication systems, the synchronization segment structure of the system receiver is built. Based on this, a Doppler estimation algorithm adapted to the short-time burst synchronization segment structure is designed. The short-time burst Doppler estimation algorithm model is established. The algorithm formula is derived and the algorithm model is theoretically analyzed. The implementation process of the algorithm for Doppler estimation is described in detail, and the algorithm is simulated. The experimental results demonstrate that the Doppler estimation accuracy of the algorithm can reach 97.2% when the signal-to-noise ratio is 1 dB, and it exceeds 99% when the signal-to-noise ratio is greater than or equal to 3 dB. These findings validate the effectiveness and feasibility of the algorithm in GMSK spread spectrum communication systems within the context of burst transmission. It also shows that the Doppler estimation algorithm can still achieve superior accuracy even under weak signal conditions within the communication system.