摘要
基于脉冲配对时两站间的互测时差值应相等的条件,对应定位基准时间设置脉冲序列,并构造含有时间偏差参量的时差测量方程。通过计算两站间在基准时间与对应脉冲序列的时间之间的时差值,可获得互测时差值的相等点,进而可确定出偏离时间基准位置的脉冲次序的数值,由此直接得到偏离基准的时间值。通过利用此时间偏差值对实测时差值进行修正,就能直接给出固定目标的高重频信号在脉冲配对时的时差测量值。
A simple pulse pairing method is presented on condition that the time difference values obtained by crossing detection exchanging time reference must be equal. The key in analysis is to construct the time difference equations containing the time deviation parameter between two references and the posi- tion ambiguity value of impulse train, which can be used for calculating the time difference between the time reference value at one station and the measured pulse time series within the front-to-back of refer- ence time at another station. Two time difference series can be obtained by mutual crossing measurement. Based on the characteristic that the slope of two time difference series is just contrary, the point in which the value of two time difference series is equal can be found in two-dimension curve chart only by making simple record and comparison for measured value of time difference. As a result, the order numbering of impulse train deviated the time reference point can be determined. Hence, the time value deviated the time reference point can be directly computed according to known impulse period. Moreover, it can be used on correction for time difference at crossing point. Thereby, the accurate time difference used for passive location can be obtained when the pulse is paired. The result shows that this new method is suit- able for both fixed target and moving target. Although the start point of this research is to solve the ambi- guity in time difference for high PRF signal, the result shows that the new method presented is applicable for any pulse signal period.
出处
《中国电子科学研究院学报》
2013年第4期423-427,共5页
Journal of China Academy of Electronics and Information Technology
关键词
脉冲配对
定位模糊
时差定位
高重频信号
pulse pairing
location ambiguity
TDOA location
high PRF signal
