摘要
针对到达时间差(Time Difference of Arrival,TDOA)精度主要由时间同步和报头检测精度决定,提出一种高精度分布式授时方法,解决民用航空多点定位系统多个远端站的高精度时间同步问题,并改进了基于FPGA的报头检测算法来提取ADS-B信号到达时间的信息,完成了低成本、高精度多点定位接收机的设计。使用PID控制器和卡尔曼滤波等方法完成驯服时钟的驯服授时模块,将驯服时钟作为分布式授时的参考时钟。在改进的报头检测算法中,提出新的动态门限值计算方法并根据4脉冲检测算法提取信号的时间信息。最后利用Chan算法验证接收机性能,实验结果表明,接收机的TDOA精度达到了理论预期。
Aiming at the fact that the accuracy of time difference of arrival(TDOA)is mainly determined by time synchronization and accuracy of preamble detection,a high-precision distributed timing method is proposed,which solves the high-precision time synchronization problem of multi-point positioning receiver in civil aviation,and improves the preamble detection algorithm based on FPGA to extract the time of arrival(TOA)information of ADS-B signals,so the design of low-cost and high-precision multi-point positioning receiver is completed.In this method,PID controller and Kalman filter are used to complete the disciplined timing service module of disciplined clock,and the disciplined clock is used as the reference clock of distributed timing service.In the improved preamble detection algorithm,a new dynamic threshold calculation method is proposed,and the time information of the signal is extracted according to the 4-pulse detection algorithm.Finally,Chan algorithm is used to verify the performance of the receiver.The statistical results show that the accuracy of TDOA has reached the theoretical expectation.
作者
刘典
汤新民
LIU Dian;TANG Xinmin(College of Civil Aviation,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;School of Transportation Science&Engineering,Civil Aviation University of China,Tianjin 300300,China)
出处
《测控技术》
2023年第8期76-82,共7页
Measurement & Control Technology
基金
国家自然科学基金(61773202,52072174)
中国航空无线电电子研究所航空电子系统综合技术国防科技重点实验室基金(6142505180407)
中国民航管理干部学院民航通用航空运行重点实验室开放基金(CAMICKFJJ-2019-04)
国家重点研发计划(2021YFB1600500)。
