| 摘要: |
| 针对运动多观测站场景下，捷变频信号时差、速度差难以通过长时间信号积累实现高精度测量的问题，提出了基于最小二乘快速补偿时差测量方法和基于高阶差分观测量补偿的改进互模糊函数速度差测量方法。首先对运动多站时差、速度差的产生机理进行理论分析；然后基于观测站与辐射源之间的空间位置关系及相对运动关系推导了时差变化率、速度差变化率等观测量的理论模型；最后对捷变频信号进行数学建模，对时差和速度差时变性影响进行定量分析，提出了捷变频信号时差、径向速度差时变性补偿和高精度测量方法。计算机仿真验证了所提方法的有效性。当信号积累时长达到1 s时，时差测量精度优于12 ns(r.m.s)，速度差测量精度优于0.001 35 m/s(r.m.s)。 |
| 关键词: 捷变频信号 时差(TDOA)估计 速度差(VDOA)估计 时变特性 互模糊函数 |
| DOI：10.20079/j.issn.1001-893x.240629001 |
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| 基金项目:国家自然科学基金联合基金（U21A20455） |
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| Compensation and Measurement for Time-varing TDOA and VDOA of Agile Frequency Signal in Moving Multi-station Systems |
| CHEN Yunfei,YANG Guang,ZHENG Zexing,ZHOU Bin,TIAN Yukun |
| (1.The 29th Research Institute of China Electronics Technology Group Corporation,Chengdu 610036,China;2.DFH Satellite Co.,Ltd.,Beijing 100094,China) |
| Abstract: |
| For the problem of high-precision measurement of time difference of arrival(TDOA) and frequency difference of arrival(FDOA) of agile frequency signal in moving multi-station observation scenarios,the authors propose a method of rapid compensation and measurement of TDOA based on least squares,and a method of compensation and measurement of velocity difference of arrival(VDOA) based on cross ambiguity function(CAF).Firstly,the theoretical mechanism of TDOA and VDOA multi-station observation scenarios is analyzed.Then,according to the spatial position and relative motion relationship between the observation station and radiation source,the theoretical model of the view measurement of TDOA change rate and VDOA change rate is derived.Finally,the mathematical model of the agile frequency signal TDOA and VDOA is established,the quantitative analysis of the time-varing influence of TDOA and VDOA is carried out,and the method of time-varing compensation and high-precision measurement of agile frequency signal TDOA and VDOA is proposed.The computer simulation verifies the effectiveness of the proposed method.When the signal accumulation time reaches 1 s,the measurement accuracy of TDOA is better than 12 ns(r.m.s),the measurement accuracy of VDOA is better than 0.001 35 m/s(r.m.s). |
| Key words: agile frequency signal time difference of arrival(TDOA)estimation velocity difference of arrival(VDOA)estimation time-varing feature cross ambiguity function |
