  The linear frequency modulated (LFM) frequency agile radar (FAR) can
synthesize a wide signal bandwidth through coherent processing while keeping
the bandwidth of each pulse narrow. In this way, high range resolution profiles
(HRRP) can be obtained without increasing the hardware system cost.
Furthermore, the agility provides improved both robustness to jamming and
spectrum efficiency. Motivated by the Newtonalized orthogonal matching pursuit
(NOMP) for line spectral estimation problem, the NOMP for the FAR radar termed
as NOMP-FAR is designed to process each coarse range bin to extract the HRRP
and velocities of multiple targets, including the guide for determining the
oversampling factor and the stopping criterion. In addition, it is shown that
the target will cause false alarm in the nearby coarse range bins, a
postprocessing algorithm is then proposed to suppress the ghost targets.
Numerical simulations are conducted to demonstrate the effectiveness of
NOMP-FAR.
