水声探空动目标参数测量方法

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

Abstract

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

CLC Number:

TN911.7

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

Figures/Tables 9

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References 26

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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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Hydroacoustic measurement method of airborne moving target parameters

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