Abstract
Based on the detection platform of space-borne radar (SBR), the dynamic electromagnetic (EM) scattering characteristics of a hypersonic vehicle covered with plasma sheath are calculated and analyzed by the physical optics (PO) method. Using the angle-time conversion method, the dynamic radar cross section (DRCS) of the vehicle in horizontal flying path and different flying states is solved in the range of L-band to X-band. The relevant effective statistical features are extracted from the time-scale matrix of DRCS based on continuous wavelet transform (CWT). The numerical results show that: At different flying altitudes, the backscattering radar cross section (BRCS) of the hypersonic vehicle covered with plasma sheath has irregular fluctuation and large range reduction in the head region of the vehicle. Generally, the higher the incident EM wave frequency is, the more detailed the fluctuation characteristics of the DRCS can be reflected. Within the same radar illuminate angle range, the time consumed by the vehicle DRCS is inversely proportional to the flying height and flying speed and is directly proportional to the detection altitude of the SBR. Besides, the different kinds of statistical eigenvalues extracted from DRCS will play an important role in hypersonic targets classification and recognition.
Highlights
Detection and recognition of hypersonic vehicle by radar remote sensing involves the study of dynamic EM scattering of metal targets combined with the plasma flow field [1,2]; especially without considering the influence of near-space clutter and noise, how to obtain reliable dynamic radar cross section (DRCS) data of hypersonic target becomes more important
The parallel physical optics (PO) method based on the inhomogeneity zonal medium model (IZMM) is used to simulate and analyze the dynamic EM scattering characteristics of the hypersonic vehicle covered with plasma sheath under the condition of controllable computing time
The results of our calculations enable us to draw the following conclusions: 1. According to the EM scattering characteristics of hypersonic vehicle at different flying altitudes, we can find that the plasma sheath can greatly change the fluctuation trend of the backscattering radar cross section (BRCS) of the hypersonic target, making its oscillation law irregular and difficult to predict
Summary
Detection and recognition of hypersonic vehicle by radar remote sensing involves the study of dynamic EM scattering of metal targets combined with the plasma flow field [1,2]; especially without considering the influence of near-space clutter and noise, how to obtain reliable DRCS data of hypersonic target becomes more important. The plasma sheath absorbs and attenuates the detection radar wave emitted by the SBR, and even makes the EM wave deviate from the original propagation track, resulting in irregular and disordered changes of the scattered signals received by the radar, and the main information of the target is lost, which brings great challenges to radar remote sensing, tracking and identifying hypersonic targets [5,6,7,8]. It is of great practical significance to explore and study the dynamic EM scattering and feature extraction of hypersonic vehicles in the low-resolution radar system [10,11]
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