| 摘要: |
| 针对无人集群协同作战通信/定位的集约化设计需求，提出了一种单载波频域均衡（SCFDE）与直接序列扩频（DSSS）技术有机结合的通信定位一体化波形。一方面，利用SCFDE中频域均衡易于克服频率选择性衰落且便于与DSSS结合的优势，使系统具有良好的适应复杂场景的通信能力；另一方面，利用恒包络零自相关导频序列的优良自相关和互相关特性，将其作为导频序列并计算与本地导频符号的循环移位相关，检测相关峰值即可实现整数符号周期信号到达时间估计。同时，结合用于信道估计的导频序列，构建差分延时相关模型，有效解决了小数采样周期信号到达时间估计问题，实现了高精度的信号到达时间估计。 |
| 关键词: 直接序列扩频 频域均衡 到达时间 通信定位一体化 |
| DOI： |
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| 基金项目:国家自然科学基金（61931020，62101569 |
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| Research on Integrated Method of Communication and Positioning for Unmanned Swarm |
| HU Chen-jun,GU Fang-lin,ZHAO Lin,ZHAO Ying,WEI Ji-bo |
| (College of Electronic Science and Technology, National University of Defense Technology, Changsha 410073, China;Beijing Information and Communication Technology Research Center, Beijing 100036, China) |
| Abstract: |
| Aiming at the intensive design requirements of communication/positioning in unmanned swarm cooperative operations, this paper proposes a communication and positioning integrated waveform that organically combines single carrier frequency domain equalization（SCFDE) and direct sequence spread spectrum (DSSS) technology. It makes use of the advantages of frequency domain equalization in SCFDE, which is easy to overcome frequency selective fading and easy to combine with DSSS, so that the system has good communication abilities to adapt to complex scenarios. On the other hand, using the excellent autocorrelation and cross-correlation characteristics of constant amplitude zero auto correlation pilot sequence, the arrival time of integer symbol period can be estimated by calculating the cyclic shift correlation between pilot sequence and local pilot sequence and detecting its peak. At the same time, combined with the pilot sequence for channel estimation, a differential delay correlation model is constructed to effectively solve the problem of arrival time of decimal symbol period, and to achieve high-precision arrival time estimation. |
| Key words: Direct sequence spread spectrum Frequency domain equalization Time of arrival Communication and positioning integration |
