Serial‐fed linear frequency diverse arrays for obtaining direction of arrival (DOA) of frequency modulated continuous waveform (FMCW) sources with ambiguity reduction

Fartookzadeh, Mahdi

doi:10.1002/mmce.21900

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…The non-contact harmonic detection of ferromagnetic materials defects is an electromagnetic NDT method based on the principle of FMCW [24]. Harmonic excitation signal combines the characteristics of lower and higher frequency electromagnetic wave which can improve the detection sensitivity and resolution and overcome the skin effect limitation.…”

Section: Principle Of Harmonic Detectionmentioning

confidence: 99%

Metrology and Measurement Systems

Zhao,

Wang,

Chen

et al. 2020

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In order to find the defects in ferromagnetic materials, a non-contact harmonic detection method is proposed. According to the principle of frequency modulated carrier wave, a tunnel magneto resistance harmonic focusing vector array detector was designed which radiates lower and higher frequency electromagnetic waves through the coil array to the detection targets. We use bistable stochastic resonance to enhance the energy of collected weak target signal and apply quantum computation and a Sobol low deviation sequence to improve genetic algorithm performance. Then we use the orthogonal phase-locked loop to eliminate the intrinsic background excitation field and tensor calculations to fuse the vector array signal. The finite element model of array detector and the magnetic dipole harmonic numerical model were also established. The simulation results show that the target signal can be identified effectively, its focusing performance is improved by 2 times, and the average signal-to-noise ratio is improved by 9.6 times after the algorithm processing. For the experiments, we take Q235 steel pipeline as the object to realize the recognition of three defects. Compared with the traditional methods, the proposed method is more effective for ferromagnetic materials defects detection.

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Section: Principle Of Harmonic Detectionmentioning

confidence: 99%

Metrology and Measurement Systems

Zhao,

Wang,

Chen

et al. 2020

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“…[3][4][5][6][7] Different from phased array (PA) producing angle-dependent beampattern, FDA generates a range-angle-dependent beampattern by applying tiny frequency offsets across the array elements. Due to its more degrees of freedom (DOF) in the range dimension, FDA provides more capabilities such as parameter estimation [8][9][10] target indication 11 and jamming suppression [12][13][14] in range-angle domains. In ref.…”

Section: Introductionmentioning

confidence: 99%

Range‐angle beamforming with frequency diverse array radar using irregular superposed multicarrier approach for target indication

Tan

Dai

Wang

et al. 2021

Int J RF Microw Comput Aided Eng

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Due to the rapid progress of electronic countermeasures in the radar area, it is urgent to meet the demand of novel technologies that possess more possibilities for precise target indication without the influence of mainlobe jamming.Recently, frequency diverse array (FDA) steals the spotlight due to its property of range-angle-dependent beamforming. Besides, the multicarrier methods are also presented to generate range-dependent beampattern. In this paper, a novel multicarrier approach is proposed based on FDA radar, namely, irregular superposed multicarrier approach. Pencil-shaped range-angle beampattern can be generated. Moreover, in the equal amount of frequency components, our proposed scheme outperforms the existing multicarrier FDA systems considering four aspects of performance. Simulations and comparative results validate the superiority of the proposed scheme.

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“…Series‐fed microstrip array antennas are used in point to point communication, surveillance radar and synthetic aperture radar (SAR) 1 . They have characteristics such as small size, light weight, easy fabrication, easy integration with RF modules, low side lobe level (SLL), and high efficiency over parallel feed arrays due to minimized feed network losses 2‐5 . Continue to achieve wideband impedance matching, low SLL, high efficiency, and low cross‐polarization (XP) for series‐fed array antennas remains a challenge 6‐8 .…”

Section: Introductionmentioning

confidence: 99%

Wideband linear microstrip array antenna with high efficiency and low side lobe level

Shirkolaei

2020

Int J RF Microw Comput Aided Eng

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In this letter, the design and fabrication of the linear microstrip array antenna by series fed are presented. The array antenna consists of 16 reflector slotstrip-foam-inverted patch (RSSFIP) antennas. The gain and efficiency of the linear array antenna is 16.6 dBi and 61% at 10 GHz, respectively. The antenna has a bandwidth (BW) of 45% from 8.1 to 12.8 GHz (S 11 < −10 dB) and side lobe level (SLL) of −25.6 dB across the BW of 19.2% from 9.4 to 10.4 GHz. These are achieved by using a microstrip series fed with defected ground structure (DGS) to feed the patch array antenna. Good agreement is achieved between measurement and simulation results.

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Serial‐fed linear frequency diverse arrays for obtaining direction of arrival (DOA) of frequency modulated continuous waveform (FMCW) sources with ambiguity reduction

Cited by 8 publications

References 20 publications

Metrology and Measurement Systems

Metrology and Measurement Systems

Range‐angle beamforming with frequency diverse array radar using irregular superposed multicarrier approach for target indication

Wideband linear microstrip array antenna with high efficiency and low side lobe level

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