{"title":"Moving Target Detection With SNR Diversity for Distributed Coherent Aperture Radar on Moving Platforms","authors":"Dingsen Zhou;Minglei Yang;Hao Lian;Teng Ma;Maria Sabrina Greco;Fulvio Gini","doi":"10.1109/TVT.2024.3505615","DOIUrl":null,"url":null,"abstract":"Distributed coherent aperture radar (DCAR) on moving platforms offers significant advantages of high mobility, long-range and high-power detection through coherent synthetic processing. However, radars may encounter signal-to-noise ratio (SNR) diversity issues in practice due to the variations in their locations, transmit powers, and time durations. Consequently, the detection performance of the DCAR can be severely degraded when the SNRs in each channel are different. Besides, the dynamic nature of platform motion poses challenges to coherent-on-receive detection due to the inconsistent Doppler frequencies across channels. In this paper, we consider the signal model incorporating the SNR diversity for DCAR on moving platforms. Subsequently, we propose two optimal channel weighting detection schemes for the moving target, including the weighted coherent-on-receive synthesis (W-CoRS) scheme and the weighted coherent-on-transmit/receive synthesis (W-CoT/RS) scheme, with both schemes aiming to maximize the output SNR. Notably, the two-stage W-CoRS scheme reduces communication costs by transmitting only weighted signals from each radar unit to the fusion center. Further, to optimize the detection performance, a high-precision coherent parameters (CPs) estimation algorithm based on the iterative Chirp-Z transform (ICZT) is proposed to address the off-grid issue of the Doppler frequency. At the same time, the proposed algorithm possesses the ability to accurately estimate the Doppler frequency offsets for each channel. Simulations demonstrate that the proposed schemes outperform the conventional DCAR (C-DCAR) in scenarios involving SNR diversity.","PeriodicalId":13421,"journal":{"name":"IEEE Transactions on Vehicular Technology","volume":"74 4","pages":"6346-6359"},"PeriodicalIF":7.1000,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Transactions on Vehicular Technology","FirstCategoryId":"94","ListUrlMain":"https://ieeexplore.ieee.org/document/10766639/","RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
Distributed coherent aperture radar (DCAR) on moving platforms offers significant advantages of high mobility, long-range and high-power detection through coherent synthetic processing. However, radars may encounter signal-to-noise ratio (SNR) diversity issues in practice due to the variations in their locations, transmit powers, and time durations. Consequently, the detection performance of the DCAR can be severely degraded when the SNRs in each channel are different. Besides, the dynamic nature of platform motion poses challenges to coherent-on-receive detection due to the inconsistent Doppler frequencies across channels. In this paper, we consider the signal model incorporating the SNR diversity for DCAR on moving platforms. Subsequently, we propose two optimal channel weighting detection schemes for the moving target, including the weighted coherent-on-receive synthesis (W-CoRS) scheme and the weighted coherent-on-transmit/receive synthesis (W-CoT/RS) scheme, with both schemes aiming to maximize the output SNR. Notably, the two-stage W-CoRS scheme reduces communication costs by transmitting only weighted signals from each radar unit to the fusion center. Further, to optimize the detection performance, a high-precision coherent parameters (CPs) estimation algorithm based on the iterative Chirp-Z transform (ICZT) is proposed to address the off-grid issue of the Doppler frequency. At the same time, the proposed algorithm possesses the ability to accurately estimate the Doppler frequency offsets for each channel. Simulations demonstrate that the proposed schemes outperform the conventional DCAR (C-DCAR) in scenarios involving SNR diversity.
期刊介绍：
The scope of the Transactions is threefold (which was approved by the IEEE Periodicals Committee in 1967) and is published on the journal website as follows: Communications: The use of mobile radio on land, sea, and air, including cellular radio, two-way radio, and one-way radio, with applications to dispatch and control vehicles, mobile radiotelephone, radio paging, and status monitoring and reporting. Related areas include spectrum usage, component radio equipment such as cavities and antennas, compute control for radio systems, digital modulation and transmission techniques, mobile radio circuit design, radio propagation for vehicular communications, effects of ignition noise and radio frequency interference, and consideration of the vehicle as part of the radio operating environment. Transportation Systems: The use of electronic technology for the control of ground transportation systems including, but not limited to, traffic aid systems; traffic control systems; automatic vehicle identification, location, and monitoring systems; automated transport systems, with single and multiple vehicle control; and moving walkways or people-movers. Vehicular Electronics: The use of electronic or electrical components and systems for control, propulsion, or auxiliary functions, including but not limited to, electronic controls for engineer, drive train, convenience, safety, and other vehicle systems; sensors, actuators, and microprocessors for onboard use; electronic fuel control systems; vehicle electrical components and systems collision avoidance systems; electromagnetic compatibility in the vehicle environment; and electric vehicles and controls.
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