Improved moving target detector using sequential combination of DPCA and ATI

Lee, Myung-Jun; Kang, Mi Jin; Ryu, Bo-Hyun; Lee, Seung-Jae; Lim, Byung-Gyun; Oh, Tae-Bong; Kim, Kyung‐Tae

doi:10.1049/joe.2019.0791

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…The proposed APS approach directly provides a mathematical formulation of the exact set of element excitations, which yield the desired APS without any iterative optimization process. Since the core calculations in the proposed approach rely on the FFT operations [ 29 , 30 , 31 , 32 , 33 , 34 ], the proposed method is computationally more efficient than the traditional optimization process, essentially coming down to trial and error [ 35 , 36 , 37 , 38 , 39 ]. Generally, it is assumed that the elements of linear array are uniformly spaced at distance d .…”

Section: Discussionmentioning

confidence: 99%

Efficient and Accurate Synthesis for Array Pattern Shaping

Kang

Baek

2022

Sensors

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Array pattern synthesis (APS) aims to create the desired array pattern as closely as possible to the prescribed mask template by varying the element excitations of the array. Herein, an efficient approach for the APS to control the sidelobe level is proposed. After designing the mask template to meet the prescribed sidelobe requirements and the waveform pattern, a set of element excitations is calculated through the Fourier transform performed on the projection the waveform pattern onto the mask template. Then, a desired array pattern can be synthesized from this updated set of excitation coefficients. The proposed APS approach directly presents a mathematical formulation of the exact set of excitations without any iterative optimization process. The proposed method is particularly suited for many array elements in linear antenna array. Thus, the proposed APS achieves substantial improvements in terms of computation complexity, performance, and ease of implementation in the algorithm when compared with conventional methods. Several simulation results are provided to verify the efficacy and effectiveness of the proposed method.

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Section: Discussionmentioning

confidence: 99%

Efficient and Accurate Synthesis for Array Pattern Shaping

Kang

Baek

2022

Sensors

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“…Synthetic aperture radar (SAR) is a powerful remote sensing technology that uses the signal it receives from the target region to create an image [1][2][3][4][5][6][7][8]. Parameters such as spatial resolution, noise equivalent sigma zero, peak sidelobe ratio, and integrated sidelobe ratio [9,10] are used to evaluate image quality.…”

Section: Introductionmentioning

confidence: 99%

Analysis Method for Determining Optimal Synthetic Aperture Time Using Estimated Range and Doppler Cone Angle at the Center of Synthetic Aperture Length

Kim

Lim

Shin

2023

J. Electromagn. Eng. Sci

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Synthetic aperture time (SAT) is a crucial component for acquiring high-quality synthetic aperture radar images with an excellent target cross-range resolution. SAT is analyzed using the range and Doppler cone angle at the center of the synthetic aperture length (SAL). However, in a real flight mission setting, only the range and Doppler cone angle at the SAL’s starting point are determined. Therefore, we present a method for estimating the range and Doppler cone angle at the center of the SAL to calculate an accurate SAT that is suitable for the spatial resolution of the assigned mission. We performed an iterative analysis of SAT at the range and Doppler cone angle at the starting point of the SAL (original SAT) and at the center of the SAL (proposed SAT). Consequently, the proposed SAT decreased by 0.69%–16.14% compared to the original SAT at a resolution of 0.1–3.0 m.

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“…[26] mentions a new SAR-GMTIm algorithm in the framework of compressed sensing (CS), which is able to obtain high-resolution SAR images with a high focus response and precise localization. In [27,28], a novel MTI scheme, which consists of DPCA detection, clustering and ATI discrimination, is also noted to reduce the probability of false alarms and improve the detection performance. However, although these methods suppress clutter in several ways, such as reducing the number of samples, reducing dimensionality, and selecting uniform samples, they have not fundamentally solved the problem.…”

Section: Introductionmentioning

confidence: 99%

A Robust Dual-Platform GMTI Method against Nonuniform Clutter

Zou

Jin

et al. 2022

Remote Sensing

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The ground moving-target indication (GMTI) technique can detect civil and military moving targets, which means that this technique has received much attention. Strong clutter background suppression is one of the critical problems in this application. However, the detection performance in heterogeneous environment can be degraded due to the inaccurate estimation of the clutter covariance matrix (CCM). In this paper, we propose a robust GMTI method using a spaceborne dual-platform synthetic aperture radar (SAR) system, which can obtain highly accurate CCM in nonuniform clutter. Firstly, the accurate CCM is estimated based on the SAR image obtained by the former platform. Then, space–time adaptive processing (STAP) is carried out using the obtained the CCM. Finally, the detection threshold is set according to the estimated CCM and detection is executed accurately. Compared with the traditional CCM estimation method in STAP using the clutter nearby the cell under test, this method directly estimates the CCM using the clutter of the cell under test, which can avoid CCM estimation mistakes in heterogeneous clutter environment. The clutter can be whitened and depressed more effectively. Additionally, with the accurate threshold acquired from the CCM, the detection probability can be effectively improved under a certain false-alarm criterion. Based on simulation data, GMTI experiments in a heterogeneous environment such as clutter with strong pollution, junction zone of hot and cold clutter, and clutter with nonuniform power are carried out; the results show that the moving targets can be effectively detected with the proposed method.

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Improved moving target detector using sequential combination of DPCA and ATI

Cited by 7 publications

References 5 publications

Efficient and Accurate Synthesis for Array Pattern Shaping

Efficient and Accurate Synthesis for Array Pattern Shaping

Analysis Method for Determining Optimal Synthetic Aperture Time Using Estimated Range and Doppler Cone Angle at the Center of Synthetic Aperture Length

A Robust Dual-Platform GMTI Method against Nonuniform Clutter

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