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Filters with antenna arrays are widely used for interference suppression in the temporal domain, frequency domain, space domain and so on. Meanwhile, the interference mitigation performance of a single-domain-based filter depends on a noticeable difference between the target signal and interference in the corresponding domain. However, the interference cannot be efficiently suppressed by a single-domain-based...
Fast Polarization MUSIC is an algorithm which can utilize the advantage of the signals polarization state to estimate their directions. Its capacity in resolving close signals is considerably enhanced, with acceptable computation complexity. In this paper, analysis of this algorithm's performance in estimation precision, resolution of close signals and computation complexity are presented. Relating...
Normal methods of spatial filtering methods may change the coherent characteristic of the target, which reduces the effect of accumulation in coherent systems despite the improvement of signal-to-interference and noise ratio (SINR). To avoid the amplitude and phase distortion introduced by the filters, null phase-shift spatial filter (NPSF) is proposed in this paper. NPSF can suppress the interference...
Radar target speed resolution is related to the accumulation time. In order to obtain higher frequency resolution, we need longer coherent accumulation time. However, long accumulation will bring many problems. Since the targets are sparse in the Doppler domain, Doppler super-resolution can be implemented in shorter accumulation time. Doppler frequency of different targets may be correlative, as well...
The paper presents the even-odd mode (EOM) analysis technique for array electrical characteristics of strong-coupling in the fired state, and decompose the array port S-parameter within the emission-coupling antenna framework, resulting in odd-mode radiation power and odd-mode impedance. Its significance lies in two kinds of active impedance separation in the strong-coupling array port, and provides...
Ionosphere phase perturbation destroys the coherence of echo signal for sky-wave Over-The-Horizon Radar (OTHR) and broadens the spectrum of signal and clutter, which will exacerbate the property of low-speed object detection. PGA (Phase Gradient Autofocus) is an excellent perturbation correction algorithm with properties of logical, concise, robust etc for various perturbations. In particularly, it...
Ionosphere phase perturbation made the clutter spectrum spread and influenced the precision of parameter inverse analysis for sky wave sea state radar. Recently, an algorithm based on piecewise polynomial signal (PPS) phase model and high-order ambiguity function has been applied to resolve this problem. The determination of the order for the polynomial phase is critical in the applications of the...
A novel polarization filtering method based on the oblique projection operator is proposed to improve the target detection performance for High Frequency Surface Wave Radar (HFSWR) system in this paper. The performance of the proposed oblique projection polarization filter (OPPF) is detailedly analyzed in presence of additive Gaussian white noise and the desired signal's Mean Square Error (MSE) with...
Combining polarization filtering with the oblique projection, we address an oblique projection polarization filter (OPPF) which enables the extraction of the desired polarized waves while suppressing the unwanted polarized interference signals, based on estimating the polarized parameters subspaces of desired signals and interferences. The simulation results show that the OPPF is a valid means to...
Ultra Wide Band (UWB) communication systems are considered to be ideally suited for future indoor and short-range wireless communications with high-speed data rate, as they operate at low power, provide high capacity in dense multipath environments. Combining the energy received over multipath, RAKE receiver usually holds good performances in the UWB communications environment. However, interferences...
Radio interference suppressing is a main problem to be solved in high frequency (HF) radar system. To effectively cancel the interference, the parameters of the polarization filter should timely adapt to the variation of the polarization of the interference, which may impact the amplitude and phase of the desired signal passing through the same polarization filter during the coherent integration time...
In this paper, multi-frequency target radar cross section (RCS) of high frequency surface wave radar (HFSWR) is used for airplane target identification. Radar working frequency optimization selection is investigated for an optimization selection method based on the minimum classification error (MCE) rule in order to improve airplane target identification performance; Target RCS is compensated with...
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