Research on Anomaly Suppression Method of Plasma-Sheath-Covered Reentry Target

Abstract

As the reentry target passes through the atmosphere at hypersonic velocity, its surface is covered with a plasma sheath. The plasma sheath produces an amplitude-phase modulation effect on the radar echo and increases the signal component of the radar echo, which seriously affects the radar’s reliable detection of reentry target and leads to a series of abnormal radar detection problems. Through the radar echo model of the plasma-sheath-covered target, the multidomain characteristics of the echo signal are analyzed, and the electromagnetic (EM) shielding effect of the plasma sheath on EM waves is revealed. Based on the intrapulse Doppler frequency extraction technology, a design method of false target filter is proposed, which can effectively suppress false targets generated by the plasma sheath. Through the simulation analysis of single-period echo signals and multiperiod echo signals, the feasibility of the algorithm in this article is verified, and the reliability of the algorithm is verified by statistical experiment analysis, which lays a theoretical foundation for reliable radar detection of plasma-sheath-covered target.