Abstract:
Tracking radar uses pencil beam to track the true range and bearing of target.
They are used in several applications like to supervise the specific air routes,
military applications, radio astronomy etc. Monopulse tracking radars are under
study since many past years. Monopulse tracking radars have the benefit over other
radar systems using conical scanning method because they are not affected by the
fluctuations in the strength of target echo. Monopulse radar detects the range
and bearing of target by comparing the amplitudes of received beams. Monopulse
tracking using IMM, Kalman and particle filter are some of the algorithms that
have been proposed in the literature. Monopulse tracking in the robust framework
has not been observed in the literature yet. In monopulse radar the error cannot be
minimized past a certain value, instead it fluctuates within a certain limit. Thus
beam of monopulse radar always has an oscillatory motion during target tracking.
This oscillatory motion can be described by chattering phenomena. The ability of
a monopulse radar to efficiently measure the target angle is greatly reduced by the
chattering phenomena. This work focuses on removing the chattering phenomena
using a model free Smooth Super Twisting Controller while estimating the true
target trajectory. Smooth Super Twisting Algorithm is used for this purpose as
it is independent of model parameters. Undesirable chattering in tracking target
trajectory is shown to be suppressed up to a great extent.
