Abstract
The interferences coming from the radar members degrade the detection and recognition performance of the radar sensor networks (RSNs) if the waveforms of the radarmembers are nonorthogonal. In this paper, we analyze the interferences by exploring the polarization information of the electromagnetic (EM) waves. Then, we propose the oblique projection polarization filtering- (OPPF-) based scheme to suppress the interferences while keeping the amplitude and phase of its own return in RSNs, even if the polarized states of the radar members are not orthogonal. We consider the cooperative RSNs environment where the polarization information of each radar member is known to all. The proposed method uses all radar members' polarization information to establish the corresponding filtering operator. The Doppler-shift and its uncertainty are independent of the polarization information, which contributes that the interferences can be suppressed without the utilization of the spatial, the temporal, the frequency, the time-delay and the Doppler-shift information. Theoretical analysis and the mathematical deduction show that the proposed scheme is a valid and simple implementation. Simulation results also demonstrate that this method can obtain a good filtering performance when dealing with the problem of interference suppressions for RSNs.
Highlights
Due to the complex and time-varying environments, with respect to the manmade or natural interferences, the detection and recognition performance of the single radar system is limited by several issues
The radar sensor networks (RSNs) are promised to operate with multiple goals managed by an intelligent platform network that can manage the dynamics of each radar member to meet the common goals of the platform, rather than each radar to operate as an independent system
We propose a novel polarization filteringbased approach for RSNs, the suggested scheme suppresses the interferences from the radar members by using the oblique projection polarization filtering (OPPF) [16,17,18,19,20], and the OPPF is the extension to the conventional polarization filtering (CPF) and the null-phase-shift polarization filtering (NPSPF)
Summary
Due to the complex and time-varying environments, with respect to the manmade or natural interferences, the detection and recognition performance of the single radar system is limited by several issues. Little attention has been paid to the applications of the PF for RSNs. In this paper, we propose a novel polarization filteringbased approach for RSNs, the suggested scheme suppresses the interferences from the radar members by using the oblique projection polarization filtering (OPPF) [16,17,18,19,20], and the OPPF is the extension to the CPF and the NPSPF. Since the polarization filtering is independent of the frequency, the spatial, and the temporal domains, the proposed design is expected to exploit more resources which can achieve better suppression performance of the clutter and the interferences for RSNs. The Doppler-shift and its uncertainty are independent of polarization, and this shows the implementation of the suggested scheme is simpler than the waveform-design-based systems. A superscript T is used to indicate the transpose of a matrix or vector, such as ST , and H denotes the Hermitian transpose, for example, SH . · is the dot product of two vectors, † is the symbol of pseudoinverse of a matrix, such as S†, and ∗ denotes the conjugate operating. j is the imaginary part unit, and · is the conjugate of a complex number
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