To study the problem of radar detection of aircraft wake vortex in wet air such as in rain and fog,analytical expressions are derived respectively for the Doppler velocity spectrum of wake vortices\' echoes,the radar equation and its detectability factor of the detection of wake vortices.

For the convenience of the study of aircraft wake vortex scattering characteristics,a rapid modeling method for the wake dielectric constant distribution is put forward.

Fault-tolerant reconfigurable control of tailless aircraft based on self-adaptive PID technology;

A drag rudder is mostly used by tailless aircraft.

The W-shaped tailless aircraft has not stabilizer and vertical tail,and it is based on the design of forward-swept wing and the integrated design of blended wing-fuselage.