| 摘要: |
| 随着北斗卫星导航系统的广泛应用，其易受干扰影响的弊端也逐渐显露出来。针对传统频域干扰检测方法中接收机灵敏度受限的问题，提出了一种基于双阵元互相关的微弱干扰检测技术。首先，建立了互相关检测模型；其次，通过理论分析和软件仿真，定性定量分析了干噪比、干扰带宽及互相关积分时长这3种因素对基于双阵元互相关干扰检测性能的影响；最后，通过实测验证了理论分析的正确性和所提方法的有效性。实测结果表明，在干扰带宽为20 MHz时，对1 ms时长的干扰进行互相关检测，可有效检测到电磁环境中功率-110 dBm以下的干扰，突破了传统频域方法-100 dBm的检测瓶颈。 |
| 关键词: 互相关 干扰检测 灵敏度 干噪比 干扰带宽 积分时长 |
| DOI： |
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| 基金项目:国家自然科学基金（62003354） |
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| Weak interference detection method of BeiDou system based on cross-correlation of two array elements |
| QIAO Jia,LU Zukun,SONG Jie,XUE Zhihao,XIAO Zhu,LI Baiyu |
| (College of Electronic Science and Technology, National University of Defense Technology, Changsha 410073, China; Key Laboratory of Satellite Navigation Technology, Changsha 410073, China;College of Computer Science and Electronic Engineering, Hunan University, Changsha 410082, China) |
| Abstract: |
| With the widespread application of the BeiDou satellite navigation system, the disadvantages of its susceptibility to interference have gradually become apparent. To address the problem of limited receiver sensitivity in traditional frequency domain interference detection methods, a weak interference detection technique based on dual-element cross-correlation is proposed. Firstly, models for cross-correlation detection are established; secondly, through theoretical analysis and software simulation, the effects of jamming-to-noise ratio, jamming bandwidth, and cross-correlation integration time on the performance of interference detection based on dual-element cross-correlation are analyzed qualitatively and quantitatively; finally, the correctness of the theoretical analysis and the effectiveness of the proposed method are verified by practical measurements. Experimental results show that with an interference bandwidth of 20 MHz, the cross-correlation detection of 1 ms duration interference can effectively detect the interference with a power lower than -110 dBm in the electromagnetic environment, breaking through the detection bottleneck of traditional frequency domain methods of -100 dBm. |
| Key words: Cross-correlation Interference detection Sensitivity Jamming-to-noise ratio Interference bandwidth Integral duration |
