水声探空动目标参数测量方法

doi:10.3969/j.issn.1001-506X.2021.01.02

摘要/Abstract

摘要：

针对空动目标参数的水声探测,建立空中运动目标激发水声信号的瞬时频率模型和运动目标参数测量模型,首先采用分段互谱密度方法测量瞬时频率,然后采用局部线性化方法测量目标速度、通过时刻、水平距离等参数。最后，仿真分析与实验结果表明:测量精度受到噪声、采样时长、目标速度、水平距离等多种因素影响,当水平距离与速度的比值在10~15范围内时,测量精度较高;在仿真条件下,速度和距离的测量精度优于3.6%,通过时刻测量精度达到0.48 s;在实测条件下,两次实验数据得到的目标速度精度分别为7.5%和8.9%,距离精度分别为16.0%和20.3%。仿真和实测结果说明本方法的正确性和可行性较高。

关键词: 水声, 多普勒效应, 互谱密度, 最近距离点, 瞬时频率

Abstract:

Focusing on the hydroacoustic measurement of airborne moving target parameters, the instantaneous frequency model for airborne moving target which excite underwater acoustic signals and moving target parameters measurement model are established. Firstly, the instantaneous frequency is measured using the piecewise cross-spectral density method. Secondly, local linearization method is used to measure parameters such as target speed, passing time and horizontal distance. Finally, simulation analysis and experiment results show that the accuracy is affected by various factors such as noise, sampling duration, target speed, and horizontal distance. When the ratio of horizontal distance to speed is within the range of 10~15, the measurement accuracy is high. Under the simulation conditions, the accuracy of speed and distance is better than 3.6%, and the measuremenr accuracy of passing time is better than 0.48 s. Under the experiment conditions, the speed accuracy of two experimental datas are 7.5% and 8.9%, and the distance accuracies are 16.0% and 20.3%, respectively. The simulation and experiment results show the validity and feasibility of the method feasible.

Key words: hydroacoustic, Doppler effect, cross spectral density (CSD), closest point of approach(CPA), instantaneous frequency

中图分类号:

TN911.7

石海杰, 李京华, 陈刚. 水声探空动目标参数测量方法[J]. 系统工程与电子技术, 2021, 43(1): 11-18.

Haijie SHI, Jinghua LI, Gang CHEN. Hydroacoustic measurement method of airborne moving target parameters[J]. Systems Engineering and Electronics, 2021, 43(1): 11-18.

图/表 9

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蒙特卡罗次数	SNR/dB	$\widehat f$₁/Hz	RMSE(f₁)	$\widehat f$₂/Hz	RMSE(f₂)
30	∞	100	0	0.2	0
30	0	100	0	0.200 8	0.010 9
50	0	100	0	0.199 7	0.009 6
100	0	100	0	0.200 0	0.010 5

h/m	d/m	l_cpa/m	v/(m/s)	f₀/Hz	H/m
50	30	500	100	100	100

参数	仿真数据	实测1	实测2
v/(m/s)	41.7	41.7	41.7
t_c/s	120	-	-
R₀/m	200	200	200
M_v/(m/s)	41.52	38.56	37.98
M_tc/s	120.48	28.21	25.65
M_R0/m	207.23	232.08	240.63
E_v/%	0.4	7.5	8.9
E_tc/s	0.48	-	-
E_R0/%	3.6	16.0	20.3

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