摘要
提出了S模式信号的数学模型,讨论了脉冲上升沿测量到达时间(time of arrival,TOA)的精度、统计方法估计TOA的最优值和最优估计的实现方法。然后,提出了一种先解码后测量TOA的改进方法,从脉冲积累的角度导出了改进方法的理论精度,与单脉冲测量的精度相比较有明显提高。针对硬件实现的问题,分析了采样对TOA测量的影响和解决方法。最后,讨论了多点定位的同步问题,将TOA的精确估计值应用于多点定位系统多部接收机之间的同步误差校正。
A mathematical model of mode S signals is built. Accuracy of time of arrival （TOA） measure- ments by pulse rise edge and best statistical estimation methods are discussed. The way to realize the best estimation is also introduced. Then a novel method is proposed to measure the TOA of mode S signals, in which the measurement is performed after the decoding of mode S signals. The accuracy of the proposed method is improved significantly compared with the single pulse measurement, which can be derived from pulse integration. The influence of sampling on TOA measurement is analyzed and the corresponding solving method is intro- duced. Finally, synchronization in a multilateration system is discussed and the accurate TOA of signals is used for calibration of synchronization errors among receivers.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2013年第4期835-839,共5页
Systems Engineering and Electronics
基金
国家自然科学基金(61079006
61139003)
中央高校基本科研业务费专项资金(ZYGX2012J027)资助课题
关键词
空中交通管制
多点定位
S模式
同步
air traffic control
multilateration
mode S
synchronization
