Research progress on radar detection technology of reentry capsules

There has been existing problems like tracking instability or loss for radar tracking reentry capsules in blackout area caused by the plasma sheath. Through researching the interaction mechanism between plasma sheath and electromagnetic wave, we proposed a target electromagnetic characteristic simulation method of reentry capsules in blackout area and a radar echo simulation method of reentry scenes. Combining simulation and real data, we obtained target echo characteristics, proposed a target detection method based on the fast time-varying property of plasma sheath, and designed a cognitive detection flow of reentry capsules in blackout area. The flow was installed to radars of multiple frequency bands, and several detection missions of reentry capsules was successfully accomplished. The ability of stable tracking of reentry capsules in blackout area is obtained, basically solving the problem of detecting reentry capsules in blackout area.