Abstract:

In the TDOA target generation system， microwave photon links are used to transmit multi-channel and multi-band target simulation signals containing accurate TDOA information. To ensure the accuracy of TDOA information is enough， it is necessary to accurately measure the propagation delay of the target simulation signal through the photon link. A novel method for measuring the propagation delay of photon link is proposed in this paper， which uses a dedicated delay measurement chip based on the gate delay counting principle to achieve high-resolution and high-precision measurement. By occupying the same optical transmission channel of a single fiber through time sharing between the delay measurement signal and the target simulation signal， the measurement of the propagation delay and the transmission of the target simulation signal are achieved for a photon link， it meets the hardware requirements for accurately measuring the propagation delay of photon link mechanically. The experimental results show that this method can accurately measure the propagation delay of the TDOA target simulation signal through the photon link， with an error of less than 1ns， which is one order of magnitude higher than the TDOA measurement accuracy of the sensor， meets the measurement accuracy requirement of the system.

Key words: time difference of arrival（TDOA）, target simulation, photon link, propagation delay, delay measurement, gate delay counting

摘要：

在TDOA（time difference of arrival）目标模拟系统中，采用微波光子链路传输包含精确TDOA信息的多路多频段目标模拟信号，为保证TDOA信息的精度足够高，需要精确测量目标模拟信号经过光子链路的传输延时。从特定工程应用角度提出一种光子链路传输延时测量方法，通过专用延时测量芯片实现传输延时高分辨率、高精度测量，通过延时测量信号和目标模拟信号分时占用单根光纤的相同光传输波道，实现光子链路传输延时测量和目标模拟信号传输分时工作，从机理上满足了精确测量光子链路传输延时所需硬件条件。 试验结果 表明该方法可精确测量目标模拟信号经过光子链路的传输延时，测量误差小于1 ns，比传感器的TDOA测量精度高一个数量级，满足系统对光子链路传输延时的测量精度要求。

关键词: 到达时差, 目标模拟, 光子链路, 传输延时, 延时测量, 门延迟计数