针对采用周期PN序列的水声直接序列扩频（DSSS）通信系统，提出基于处理增益的水声直扩系统抗干扰能力的研究方法，研究宽带干扰、部分频带干扰以及单频干扰下系统的抗干扰性能，通过仿真对直扩系统在不同干扰下的抗干扰性能进行研究分析。结果表明，直扩系统对宽带噪声干扰的处理能力有限，与非扩频系统相比，系统抗干扰性能无明显提高；直扩系统对部分频带干扰抑制作用明显，其具体效果与干扰相对信号载频的位置以及干扰带宽有关；单频干扰对直扩系统性能的影响与干扰相对信号载频的位置有关，当干扰频偏为码元带宽的整数倍时，频偏为一倍码元带宽时系统抗干扰性能最差；干扰瞄准信号载频时，3种相同功率的干扰下，系统抗单频干扰能力最强。仿真结果与试验结果一致，表明本文所提出的基于处理增益的水声直扩系统抗干扰能力研究方法的可行性与有效性，为直扩系统的抗干扰性能分析提供了新的方法与思路。
For hydroacoustic direct sequence spread spectrum (DSSS) communication systems using periodic short codes，the research method of the anti-interference ability of the DSSS system based on the processing gain was proposed, and the anti-interference performance of the system under wideband interference , narrowband interference and single-tone interference was studied, and the anti-jamming performance of DSSS system under different interference was studied and analyzed by simulation. The results show that the DSSS system has limited ability to deal with wideband interference, and the anti-jamming performance of the DSSS system is not significantly improved compared with the non-DSSS system. The DSSS system has obvious suppression effect on narrowband interference, and its specific effect is related to the position of the interference relative to the signal carrier frequency and the interference bandwidth. The influence of single-tone interference on the performance of DSSS system is related to the position of the interference relative to the carrier frequency of the signal. In all cases where the interference frequency offset is an integer multiple of the symbol bandwidth, the system anti-jamming performance is the worst when the frequency offset is the bit bandwidth. The system is most resistant to single-tone interference when three types of interference target the signal carrier frequency with the same power. The simulation results are consistent with the experimental results, showing the feasibility and effectiveness of the research method of the anti-interference capability of the hydroacoustic DSSS system based on the processing gain proposed in this paper, which provides a new method and idea for the anti-interference performance analysis of the DSSS system.
2024,46(10): 132-139 收稿日期：2023-07-04
DOI：10.3404/j.issn.1672-7649.2024.10.023
分类号：U675.7
基金项目：国家自然科学基金资助项目（52071334）
作者简介：王晓玮(1998-),女,博士研究生,研究方向为水下信息技术与无人装备
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