Monopulse forward‐looking imaging algorithm based on Levenberg–Marquardt optimisation

Zhou, Tao; Pang, Bo; Dai, Dahai; Wu, Hao; Wang, Xuesong

doi:10.1049/joe.2019.0149

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…A problem with DoA estimation is the ability to resolve the closely spaced targets. In [ 28 ] is illustrated a method of resolving targets by monopulse radar using Levenberg–Marquardt optimization. The authors of [ 29 ] obtained the angular separation of the two closely located targets using diagonal difference channel in the monopulse radar with a four-element antenna system.…”

Section: Uwb Radar Applicationsmentioning

confidence: 99%

Sinuous Antenna for UWB Radar Applications

Mescia

Mevoli

Lamacchia³

et al. 2021

Sensors

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In this paper, the recent progress on sinuous antennas is detailed, focusing the attention on the antenna geometry, dielectric structure, and miniaturization techniques. In the first part, we introduce the basic principles of the frequency-independent antenna, in particular the self-complementary and log-periodic geometries, as well as the antenna geometries, all characterized in terms of angles. The operating principles, main advantages, system design considerations, limits, and challenges of conventional sinuous antennas are illustrated. Second, we describe some technical solutions aimed to ensure the optimal trade-off between antenna size and radiation behavior. To this aim, some special modification of the antenna geometry based on the meandering as well as on the loading with dielectric structures are presented. Moreover, the cavity backing technique is explained in detail as a method to achieve unidirectional radiation. Third, we present a new class of supershaped sinuous antenna based on a suitable merge of the 2D superformula and the sinuous curve. The effect of the free parameters change on the antenna arm geometry as well as the performance improvement in terms of directivity, beam stability, beam angle, gain, and radiating efficiency are highlighted.

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Section: Uwb Radar Applicationsmentioning

confidence: 99%

Sinuous Antenna for UWB Radar Applications

Mescia

Mevoli

Lamacchia³

et al. 2021

Sensors

View full text Add to dashboard Cite

show abstract

“…An additional problem with direction finding is the ability to resolve the closely spaced targets. The method of resolving targets by monopulse radar using Levenberg-Marquardt is presented in [ 7 ]. This solution provides high-angle measuring accuracy for one and two targets by performing a series of complex computer calculations.…”

Section: Introductionmentioning

confidence: 99%

Some of Problems of Direction Finding of Ground-Based Radars Using Monopulse Location System Installed on Unmanned Aerial Vehicle

Rutkowski¹,

Kawalec²

2020

Sensors

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Locating active radars in real environmental conditions is a very important and complex task. The efficiency of the direction finding (DF) of ground-based radars and other microwave emitters using unmanned aerial vehicles (UAV) is dependent on the parameters of applied devices for angle location of microwave emitters, and on the construction and modes of operation of the observed transmitting antenna systems. An additional factor having the influence on DF of the radar, when are used systems installed on the UAV, is the rotation of the antenna of a radar. The accuracy of estimation of direction of any microwave transmitter is determined by the terrain properties that surround the transmitter and the objects reflecting microwave signals. The exemplary shapes of the radar antenna patterns and the associated relationships with the probability of remotely detecting the radar and determining its bearings are described. The simulated patterns of the signals received at an emitter-locating device mounted on a UAV and the expected results of a monopulse DF based on these signals are presented. The novelty of this work is the analysis of the DF efficiency of radars in conditions where intense multi-path phenomena appear, and for various amplitudes and phases of the direct signal and multi-path signals that reach the UAV when assuming that so-called simple signals and linear frequency modulation (LFM) signals are transmitted by the radar. The primary focus is on multi-path phenomenon, which can make it difficult, but not entirely impossible, to detect activity and location of radar with a low-flying small UAV and using only monopulse techniques, that is, when only a single pulse emitted by a radar must be sufficient to DF of this radar. Direction of arrival (DOA) algorithms of signals in dense signal environment were not presented in the work, but relevant suggestions were made for the design of such algorithms.

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Monopulse forward‐looking imaging algorithm based on Levenberg–Marquardt optimisation

Cited by 2 publications

References 12 publications

Sinuous Antenna for UWB Radar Applications

Sinuous Antenna for UWB Radar Applications

Some of Problems of Direction Finding of Ground-Based Radars Using Monopulse Location System Installed on Unmanned Aerial Vehicle

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