It is helpful to note that error terms in the last two terms can be Intedanib compensated due to space position information extracted from Inhibitors,Modulators,Libraries the coarse resolution images. Now to facilitate the analysis, TNF-�� inhibitor we rewrite Equation (10) as followingfr(m1,m2;k1,k2)=expj��0(1+��0(k1+��2k2))(sxd��m1)?expj��0��0(?sy)k1+j?e1?expj��0(1+��0��2k2)(sxd����2)m2+j?e2?expj��0��0��2(?sy)k2+j?e3(11)where ?e1 = ��0��0sxd����2m2k1, ?e2 = ��0 (1 + ��0��2k2)(��1��2m2+��2 (��2m2)2), and ?e3 = ��0��0m2��0k2 are the undesired terms, which should be compensated in this algorithm.From Equation (1
High resolution radar is an area of vigorous research and development in recent years. It is known that radar’s range resolution is inversely proportional to its bandwidth.
Therefore, the increase in bandwidth correspondingly improves the radar’s range resolution.
However, the wideband radar Inhibitors,Modulators,Libraries pulses complicate the design of transmitters and receivers. Also, such radar receivers are subject to potential interference from other sources.To overcome these drawbacks, Ruttenberg [1] introduced a kind of radar waveforms Inhibitors,Modulators,Libraries containing a train of pulses whose carrier frequencies were different from each other. In 1984, the stepped-frequency pulse trains, with the carrier frequency of each pulse shifting linearly at a constant step, were introduced by Einstein, T.H. Inhibitors,Modulators,Libraries Inhibitors,Modulators,Libraries [2]. The total bandwidth of the pulse train Inhibitors,Modulators,Libraries can be synthesized together and the high range resolution profile (HRRP) can be generated by the inverse discrete Fourier transform (IDFT).
Inhibitors,Modulators,Libraries Since then, the stepped-frequency pulse trains have been widely used in high range resolution (HRR) radars.
As mentioned in [2�C3], the stepped-frequency radars suffer from distortion arising from the target’s motion. An uncompensated non-zero Inhibitors,Modulators,Libraries radial velocity is found to have two effects Anacetrapib on the HRRP. The first one is the circular shift in the HRRP. The second effect is the attenuation and dispersion of the HRRP [2]. These effects degrade the performance of stepped-frequency radars. Recently, several investigations have been proposed to mitigate the distortion caused by target’s motion. In [4], two effective methods called reverse-count method and amplitude-interpolating method were introduced to solve the range shift effect.
However, the attenuation/dispersion effect was not taken into account.
In [5], the distortion of the HRRP from a perturbed target was analyzed, and a Pacritinib FLT3 numerical model was developed to simulate the distortion effects. A kind of phase-coded, Drug_discovery stepped-frequency waveforms, which had lower Doppler sensitivity than the traditional ones, was introduced by Temple in [6]. In [7], two successive stepped-frequency pulse trains were used to eliminate the phase errors of Tofacitinib Citrate mechanism the moving target. Li et al. [8] introduced a new method using multiple stepped-frequency pulse trains and the robust phase unwrapping theorem to estimate the range and the velocity of the target.