大多普勒环境下的MSK扩频非相干接收方法
A New MSK Spread Spectrum Incoherent Reception Method in Large Doppler Environment
辜方林 1凌碧海 1时荔蕙 2杨丽博 2赵海涛 1魏急波1
作者信息
- 1. 国防科技大学电子科学学院,长沙 410073
- 2. 中国人民解放军32180部队,北京 100072
- 折叠
摘要
针对高动态与极低信噪比环境下传统相干接收机工作不稳定、实现复杂的难题,提出了一种MSK体制的扩频非相干接收方法.首先,分析了 MSK信号的相位特征,推导了多普勒频偏引起的累积相偏对接收性能的影响,构建了复合网格相位补偿模型并理论推导了其多普勒频偏范围的适应能力.在此基础上,提出了一种基于差分相位相关的联合解扩解调非相干接收方法.仿真与实验的结果表明,在相同的扩频因子下,该接收方法与传统的直扩MSK系统相比性能提升约2 dB;当传输带宽为20 MHz,接收端复合网格数为5,最小相位旋转为0.06π时,所提方法在750 kHz的理论推导多普勒频偏范围内均保持良好的稳定性.该方法具有性能良好、对频偏适应性强、实现复杂度低的优点,在高动态、低信噪比的通信场景下具有广阔的应用前景.
Abstract
Aiming at the difficulties of unstable operation and complicated realization of traditional coherent receivers in high dynamic and extremely low signal-to-noise ratio environments,a spread-spectrum incoherent reception method for MSK regime is proposed.Firstly,the phase characteristics of MSK signals are analyzed,the influence of the cumulative phase deviation caused by Doppler frequency deviation on the reception performance is deduced,and a composite mesh phase compensation model is constructed to theoretically derive the adaptive ability of its Doppler frequency deviation range.On this basis,a joint de-spreading and demodulation incoherent reception method based on differential phase correlation is proposed.The results of simulations and experiments show that the performance of this reception method is improved by about 2 dB compared with the conventional DSSS-MSK system under the same spreading factor;when the transmission bandwidth is 20 MHz,the number of composite grids at the receiver is 5,and the minimum phase rotation is 0.06π,the proposed method maintains favorable stability over the theoretically derived Doppler frequency deviation range of 750 kHz.The proposed method has the advantages of excellent performance,strong adaptability to frequency deviation,and low realization complexity,and it has a promising application prospect in the communication scenarios with high dynamics and low signal-to-noise ratio.
关键词
MSK/非相干接收/联合解扩解调/扩频增益/多普勒频偏Key words
MSK/Incoherent reception/Joint de-spreading and demodulation/Spread spectrum gain/Doppler frequency deviation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据