基于电离层网格辅助的卫星快跳频信号快速捕获算法

发布时间：2018-04-18 10:48

本文选题：电离层色散 + 卫星通信　；参考：《计算机应用研究》2017年02期

【摘要】：卫星抗干扰通信系统中,采用相干快速跳频信号能有效提高信号抗转发式干扰和抗截获能力。由于电离层色散的存在,快跳频信号捕获时需要搜索电离层TEC值以消除电离层传播延迟。地面站采用全球电离层垂直电子总数(VTEC)网格信息辅助跳频信号捕获,利用卫星仰角信息得到传播路径上TEC值及各频点传播延迟,据此调整各频点内积分结果实现多频点相干积分,降低捕获搜索维度。推导出电离层VTEC网格精度误差导致的捕获能量损失,克服了电离层色散对相干BPSK跳频信号相干累积的影响,分析了本算法相对搜索TEC算法的简化效益,研究结果对不同频带的卫星跳频信号同步具有参考价值。
[Abstract]:In the satellite anti-jamming communication system, using coherent fast frequency hopping signal can effectively improve the signal anti-forwarding interference and anti-interception ability.Due to the existence of ionospheric dispersion, it is necessary to search the ionospheric TEC value to eliminate the ionospheric propagation delay when fast hopping signals are captured.The earth station uses the global ionospheric vertical electron total number (VTEC) grid information to assist the frequency hopping signal capture, and uses the satellite elevation information to obtain the TEC value on the propagation path and the propagation delay at each frequency point.The multi-frequency coherent integral is realized by adjusting the integral result of each frequency point, and the dimension of capture and search is reduced.The loss of capture energy caused by the precision error of ionospheric VTEC mesh is deduced, which overcomes the influence of ionospheric dispersion on coherent accumulation of coherent BPSK frequency hopping signals, and analyzes the simplified benefits of this algorithm in comparison with the search TEC algorithm.The results are valuable for the synchronization of satellite frequency hopping signals in different frequency bands.
【作者单位】：解放军理工大学通信工程学院;
【基金】：国家自然科学基金资助项目(91338201,91438109,61571464,61401507)
【分类号】：TN927.2

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