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Abstract

According to the requirements for target detection and recognition of hypervelocity vehicles in near space, the simulation and measurement of corresponding electromagnetic scattering characteristics of non-uniform plasma generated by hypervelocity targets are conducted. A numerical calculation method with dynamic plasma parameters is developed and hypervelocity HTV2-like models launched by the ballistic ranges are used to simulate complex shape target flying at a hypervelocity velocity. The high-precision shadow imaging systems and radar measurement systems of the ballistic range are used to measure the model postures, the electromagnetic scattering characteristics of the whole targets and their flow fields in both C band and X band. The experimental measurement results of the radar cross section (RCS) of the models and their flow fields under different experimental conditions are obtained. The results show that the numerical simulation methods of unsteady high-temperature ionized air flow can be used to simulate the unsteady thermal chemical flow fields around the head and body of the simplified hypervelocity HTV2-like flight models. The electromagnetic scattering characteristics of the models and their plasma sheath differ by more than one order of magnitude under different experimental conditions. The total RCS of the model’s wake in the C band is much smaller than that of the model, and the total RCS of the model’s wake in the X band is significantly enhanced. The attitude angles of the models have great influence on their electromagnetic scattering characteristics and their RCSs with different attitude angles can differ by one order of magnitude. The electromagnetic scattering energy of the model in the C band is distributed mainly around the targets and their flow fields surrounding them. The X band electromagnetic scattering energy of the model is distributed mainly in the regions around the targets, surrounding flow fields and the wake flow fields. According to the experimental conditions of the ballistic range, the numerical simulation analyses of the electromagnetic scattering characteristics of the models and flow fields around them are carried out, and the maximum error between simulation and experimental results is less than 4 dB, verifying the effectiveness of the modeling methods of simulating electromagnetic scattering characteristics of non-uniform plasma coated targets.

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Corresponding author:Ma Ping,hbmaping@263.net

Funds:Project supported by the National Basic Research Program of China (Grant No. 2019YFA0405200) and the National Defense Pre-Research Foundation of China (Grant No. 6140416010102)

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实验状态		球模型及其等离子体鞘套套RCS/dBsm		尾迹RCS/dBsm
压力/kPa	速度/(km·s^–1)	测量实验值	计算结果	实验测量值	计算结果
4.2	5.0	–31.40	–31.31	–52.10	–50.63

DownLoad: CSV

实验状态		模型姿态			高超声速类HTV2模型全目标RCS实测结果/dBsm
速度/(km·s^–1)	压力/kPa	俯仰角 /(°)	偏航角 /(°)	滚转角 /(°)	模型全目标总RCS	本体及绕流场RCS	尾迹RCS
5.0	7.6	22.43	5.18	103.65	5.91	5.90	–18.83
5.0	8.8	–1.85	14.79	–107.27	–4.19	–4.27	–21.57
5.0	10.4	–7.15	–2.10	69.40	–2.61	–2.72	–18.75
5.0	15.3	6.02	–10.1	–109.07	1.90	1.87	–19.79

DownLoad: CSV

实验状态		模型姿态			高超声速类HTV2模型全目标RCS 实测结果/dBsm
速度 /(km·s^–1)	压力 /kPa	俯仰角/(°)	偏航角 /(°)	滚转角 /(°)	模型全目标总RCS	本体及绕流场RCS	尾迹RCS
4.0	8.5	–17.00	23.00	6.80	–8.75	–8.76	–35.56
5.0	6.6	7.50	–11.00	108.28	1.05	1.05	–30.70
5.0	8.2	18.93	17.11	109.95	–2.92	–3.44	–12.43
5.0	11.6	4.03	–3.25	107.73	–3.63	–3.94	–15.23
5.0	14.8	–7.00	9.10	70.93	–5.99	–9.36	–8.68

DownLoad: CSV

测量波段	实验状态		姿态角/(°)			模型及等离子体鞘套总RCS
测量波段	压力 /kPa	速度/(km·s^–1)	俯仰角	偏航角	滚转角	测量/dBsm	计算/dBsm	误差/dB
X	8.2	5.0	18.93	17.11	109.95	–3.30	–1.51	1.79
C	10.4	5.0	–7.15	–2.10	69.4	0.73	3.14	2.41
X	11.6	5.0	4.03	–3.25	107.73	–3.94	–5.20	1.26
X	14.8	5.0	–7.00	9.10	70.93	–9.26	–6.01	3.35

DownLoad: CSV

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Vol. 71, Issue 8 - 2022-04-20

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