Sea clutter suppression for shipborne HFSWR using joint sparse recovery‐based STAP

Zhu, Yongtian; Yan, Wei; Zhu, Kaihui

doi:10.1049/el.2016.0212

Cited by 7 publications

(6 citation statements)

References 8 publications

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“…The hybrid over-the-horizon (OTH) radar based on sky-wave transmission and ground-wave reception is a new system radar different from conventional radar. This new system early warning radar is based on the existing sky-wave and groundwave over-the-horizon radar technology, which is expected to overcome the defects of sky-wave and ground-wave overthe-horizon radar, give full play to their advantages, form complementary advantages, and further improve the detection ability of slow targets such as ships [1][2][3][4][5][6][7][8]. The detection principle is shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…Because its signal needs to pass through the sky wave propagation path and the ground wave propagation path, the special working system and propagation characteristics of this hybrid over-the-horizon radar make its detection performance more affected by external environmental factors and system layout. The preliminary analysis and verification show that, because the high-frequency (HF) radar from heaven to Earth needs to use the ionosphere to reflect the HF radio waves once to detect the long-distance sea surface targets and the targets above, the ocean echo signal will be affected by the ionosphere disturbance, and the sea clutter broadening is very serious, which seriously affects the effective detection of ship targets [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Joint correction method for ionospheric phase pollution of high‐frequency sky‐surface wave radar based on adaptive optimal path

Wang

Zhang

et al. 2023

IET Radar Sonar & Navi

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The high-frequency (HF) hybrid sky-surface wave system is a new early warning radar. However, due to the influence of bistatic angle and ionospheric phase path disturbance, the echo spectrum will be widened, which seriously affects the ability of detecting slow targets of ships. In view of the overlapping of positive and negative Bragg broadening peaks caused by the large amplitude ionospheric phase path disturbance in the echo spectrum of HF sky-surface wave radar, a joint correction method of ionospheric phase pollution based on adaptive optimal path is proposed in this paper. Firstly, the timefrequency spectrum polluted by ionospheric phase is obtained by high resolution timefrequency MUSIC transform, then the ionospheric phase disturbance curve in the time spectrum of polluted echo is extracted by the proposed adaptive optimal path method, and then the polluted echo is initially compensated to obtain the sharpened ocean echo spectrum. Finally, the residual phase of pollution curve is estimated by the Phase Gradient Autofocus method, and then the pollution echo is accurately corrected. The results of theoretical and measured data show that this method is effective in correcting the overlapping of positive and negative Bragg broadening peaks caused by serious ionospheric phase pollution.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Joint correction method for ionospheric phase pollution of high‐frequency sky‐surface wave radar based on adaptive optimal path

Wang

Zhang

et al. 2023

IET Radar Sonar & Navi

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“…Space-time adaptive processing (STAP) has been proven to be an effective clutter suppression algorithm for this kind of clutter. Some direct-from STAP methods like joint domain localized (JDL), improved orthogonal weighting (IOW), and improved oblique projection (IOP) have been proposed for clutter suppression in shipborne HFSWR [6][7][8][9][10][11][12]. Except for the direct-form processor structure, like the methods above-mentioned, the STAP algorithm can be implemented in the generalized sidelobe canceler (GSC) structure [13].…”

Section: Introductionmentioning

confidence: 99%

A Knowledge-Based Auxiliary Channel STAP for Target Detection in Shipborne HFSWR

et al. 2021

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The broadened first-order sea clutter in shipborne high frequency surface wave radar (HFSWR), which will mask the targets with low radial velocity, is a kind of classical space–time coupled clutter. Space–time adaptive processing (STAP) has been proven to be an effective clutter suppression algorithm for space-time coupled clutter. To further improve the efficiency of clutter suppression, a STAP method based on a generalized sidelobe canceller (GSC) structure, named as the auxiliary channel STAP, was introduced into shipborne HFSWR. To obtain precise clutter information for the clutter covariance matrix (CCM) estimation, an approach based on the prior knowledge to auxiliary channel selection is proposed. Auxiliary channels are selected along the clutter ridge of the first-order sea clutter, whose distribution can be determined by the system parameters and regarded as pre-knowledge. To deal with the heterogeneity of the spreading first-order sea clutter, an innovative training samples selection approach according to the Riemannian distance is presented. The range cells that had shorter Riemannian distances to the cell under test (CUT) were chosen as training samples. Experimental results with measured data verified the effectiveness of the proposed algorithm, and the comparison with the existing clutter suppression algorithms showed the superiority of the algorithm.

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“…Thus, these compensation methods are mainly suitable for a radar system on a floating platform not in sailing mode, but they are not necessarily suitable for the radar systems on a ship with forward motion or even yaw. Existing studies related to motion compensation for shipborne HFSWR are actually for sea clutter suppression rather than motion compensation [18][19][20][21][22]. In fact, motion compensation and sea clutter suppression are two different processes for target detection by an HFSWR on a sailing ship.…”

Section: Introductionmentioning

confidence: 99%

Vessel Target Echo Characteristics and Motion Compensation for Shipborne HFSWR under Non-Uniform Linear Motion

Wang

Huang

et al. 2021

Remote Sensing

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For shipborne high-frequency surface wave radar (HFSWR), the movement of the ship has a great impact on the radar echo, thus affecting target detection performance. In this paper, the characteristics of the target echo spectrum and the motion compensation methods for shipborne HFSWR are investigated. Firstly, simulation analysis of echo from a moving target under different ship motion conditions was conducted with a focus on the frequency shift and broadening characteristics of the target echo spectrum. The simulation results show that the non-uniform linear motion and yaw of the ship will shift and broaden the target echoes, resulting in signal-to-noise ratio (SNR) reduction. When the ship velocity and yaw angle change periodically, false target echo peaks will appear in the echo spectrum, which will reduce the accuracy of target detection. To tackle this problem, a motion compensation scheme for the target echo is proposed, including the heading compensation for the effect of yaw and the velocity compensation for non-uniform movement. The influence of the velocity and yaw angle measurement accuracy on the compensation results is also analyzed. Finally, the target echo characteristics and motion compensation method of shipborne HFSWR are verified with experimental data.

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Sea clutter suppression for shipborne HFSWR using joint sparse recovery‐based STAP

Cited by 7 publications

References 8 publications

Joint correction method for ionospheric phase pollution of high‐frequency sky‐surface wave radar based on adaptive optimal path

Joint correction method for ionospheric phase pollution of high‐frequency sky‐surface wave radar based on adaptive optimal path

A Knowledge-Based Auxiliary Channel STAP for Target Detection in Shipborne HFSWR

Vessel Target Echo Characteristics and Motion Compensation for Shipborne HFSWR under Non-Uniform Linear Motion

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