下载后可任意编辑GNSS 拒止环境中无人机 UHF 频段测控链路高精度授时方法讨论UAV High precious timing method based on UHF band of TT&C data-link in GNSS denial environment刘亚擎、 窦荣鑫摘要: 针 对 无 人 机 进 入 GNSS (Global Navigation Satellite System)拒止环境中无法猎取时间信息的问题, 提出利用无人机UHF (ultra-high frequency)频段的测控链路, 进行高精度授时的算法。该算法利用 DDS (digital direct synthesizer)产生调整精度为 2-16ns 的时钟信号, 供给 GNSS 接收机和测控链路使用; 利用接收信号频差和载波相位信息, 将单向测时精度提高到0.05ns; 使用双向双频授时算法进行测距授时处理。MATLAB 仿真结果表明, 无人机 UHF 频段测控链路双向测时精度达到 0.1ns。但由于无人机地面站的 GNSS 接收机的授时精度为 10ns, 无人机的授时精度为 10ns。该方法无需占用新的频谱, 只需在硬件上增加成本低体积小的高精度时钟源, 在软件上按需增加测控信息中的授时电文, 就能达到和 GNSS 接收机一致的授时精度, 并附带获得精度为 0.03 米的测距信息, 能满足无人机在 GNSS 拒止环境中编队飞行、 协同检测、 协同控制等任务的授时要求。关键词: 无人机 测控链路 高精度授时Abstract:An UAV (Unmanned aerial vehicle ) high precious timing method based on UHF (ultra-high frequency) band of TT&C (tracking & control) data-link was proposed to provide the time information in the GNSS denial environment. A 下载后可任意编辑shared clock source architecture with 2-16ns control accuracy based on DDS (digital direct synthesizer) was proposed for GNSS receiver and TT&C data-link. Solo-direction timing measure accuracy was improved to 0.05ns by using the frequency difference and carrier phase. Dual-direction dual-frequency timing algorithm was proposed. That algorithm could achieve 0.1ns timing accuracy. The UAV timing accuracy is 10ns, because of the GCS (Ground Control Station) timing accuracy is 10ns. This method required no more frequency band, only a DDS in hardware, and ...
