Adaptive Pulse Compression for Sidelobes Reduction in Stretch Processing Based MIMO Radars

Malik, Hamza; Burki, Jehanzeb; Mumtaz, Muhammad Zeeshan

doi:10.1109/access.2022.3203587

Cited by 3 publications

(3 citation statements)

References 35 publications

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“…where AF ps (θ, ϕ), AF s (θ, ϕ) are the subarray position factor and subarray factor. Then the PSLL can be calculated by PSLL (dB) = 20 log 10 AF sl,max (u, v) AF main (6) where AF sl,max (u,v) is the maximum sidelobe value of the radiation pattern. AF main is the peak value of the main lobe.…”

Section: Analysis Methods a Array Synthesis Using Subarraysmentioning

confidence: 99%

“…For more information, see https://creativecommons.org/licenses/by-nc-nd/4.0/ communication, remote sensing [6], [7], [8] and medical imaging [9], [10]. Aperiodic array antennas with optimized elements can greatly reduce PSLL, but for large and medium-sized array, the array structure with high degree of freedom makes it difficult to realize wave control and power feeding.…”

Section: Introductionmentioning

confidence: 99%

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A Scalable Arrangement Method for Aperiodic Array Antennas to Reduce Peak Sidelobe Level

Zhang

Chen

et al. 2023

IEEE Access

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Peak sidelobe level reduction (PSLR) is crucial in the application of large-scale array antenna, which directly determines the radiation performance of array antenna. We study the PSLR of subarray level aperiodic arrays and propose three array structures: dislocated subarrays with uniform elements (DSUE), uniform subarrays with random elements (USRE), dislocated subarrays with random elements (DSRE). To optimize the dislocation position of subarrays and random position of elements, the improved Bat algorithm (IBA) is applied. To draw the comparison of PSLR effect among these three array structures, we take three size of array antennas from small to large as examples to simulate and calculate the redundancy and peak sidelobe level (PSLL) of them. The results show that DSRE is the optimal array structure by analyzing the dislocation distance of subarray, scanning angle and applicable frequency. The proposed design method is a universal and scalable method, which is of great application value to the design of large-scale aperiodic array antenna.INDEX TERMS Subarray level aperiodic array, peak sidelobe level reduction, bat algorithm, redundancy.

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Section: Analysis Methods a Array Synthesis Using Subarraysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Scalable Arrangement Method for Aperiodic Array Antennas to Reduce Peak Sidelobe Level

Zhang

Chen

et al. 2023

IEEE Access

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“…For MIMO radar systems, two commonly employed pre-detection methods are Matched Filtering-Beam Forming-Discrete Fourier Transform (MF-BF-DFT) [23] and Adaptive Pulse Compression-Beam Forming-Discrete Fourier Transform (APC-BF-DFT) [24]. The MF-BF-DFT method is the simplest and most convenient method for engineering applications, while the APC-BF-DFT method improves the effect of suppression on range sidelobes compared to the former method but increases computation complexity.…”

Section: Introductionmentioning

confidence: 99%

A Space–Time–Range Joint Adaptive Focusing and Detection Method for Multiple Input Multiple Output Radar

Guan,

Mu,

Huang

et al. 2023

Remote Sensing

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The Multiple Input Multiple Output (MIMO) radar, as a new type of radar, emits orthogonal waveforms, which provide it with waveform diversity characteristics, leading to increased degrees of freedom and improved target detection performance. However, it also poses challenges such as difficulty in meeting higher data demand, separating waveforms, and suppressing the multidimensional sidelobes (range sidelobes, Doppler sidelobes, and angle sidelobes) of targets. Phase-coded signals are frequently employed as orthogonal transmission signals in the MIMO radar. However, these signals exhibit poor Doppler sensitivity, and the intra-pulse Doppler frequency shift can have an impact on the effectiveness of the matching filtering process. To address the aforementioned concerns, this paper presents a novel approach called the Space–Time–Range Joint Adaptive Focusing and Detection (STRJAFD) method. The proposed method utilizes the Mean Square Error (MSE) criterion and integrates spatial, temporal, and waveform dimensions to achieve efficient adaptive focusing and detection of targets. The experimental results demonstrate that the proposed method outperforms conventional cascaded adaptive methods in effectively addressing the matching mismatch issue caused by Doppler frequency shift, achieving super-resolution focusing, possessing better suppression effects on three-dimensional sidelobes and clutter, and exhibiting better detection performance in low signal-to-clutter ratio and low signal-to-noise ratio environments. Furthermore, STRJAFD is unaffected by coherent sources and demands less data.

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A Low-Cost Wideband Digital Array Antenna Based on Stretch Processing Technique

Yu,

Hao,

Yang

et al. 2024

International Journal of Antennas and Propagation

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Wideband digital phased array radar offers the advantages of high range resolution, which improves the recognition ability for multiple targets, group targets, and high-speed targets. Traditional wideband phased arrays use true time delay to compensate for aperture fill time; however, the cost increases significantly. In this paper, a wideband elemental digital array architecture based on the stretch processing method is proposed. By utilizing the time-domain and frequency-domain translation equivalence of the LFM (Linear Frequency Modulation) signal waveform, the equivalent aperture fill time is compensated for through frequency shift and phase shift after stretch processing. Compared to traditional wideband digital arrays, this method can dramatically reduce the required sampling rate and lower the requirements on antenna hardware, thereby reducing the manufacturing cost of system. A comprehensive analysis of the signal processing process and stretch processing method is provided. And an antenna array prototype is developed to verify the T/R channel compensation and wideband beamforming. Measured results show that the antenna is capable of ±60° scanning in azimuth plane and ±40° scanning in elevation plane, with a bandwidth of 500 MHz in S-band. The results demonstrate excellent wideband beam performance and accurate lobe scanning, which confirms the validity of the proposed wideband architecture for stretch processing, frequency shift, and phase shift. This method can be widely applied to the low-cost design and wideband performance improvement of wideband digital array radar.

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Adaptive Pulse Compression for Sidelobes Reduction in Stretch Processing Based MIMO Radars

Cited by 3 publications

References 35 publications

A Scalable Arrangement Method for Aperiodic Array Antennas to Reduce Peak Sidelobe Level

A Scalable Arrangement Method for Aperiodic Array Antennas to Reduce Peak Sidelobe Level

A Space–Time–Range Joint Adaptive Focusing and Detection Method for Multiple Input Multiple Output Radar

A Low-Cost Wideband Digital Array Antenna Based on Stretch Processing Technique

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