Evaluation of polarisation characteristics of power‐line RCS at 76 GHz for helicopter obstacle detection

Futatsumori, Shunichi; Morioka, Kazuyuki; Kohmura, Akiko; Shioji, Makoto; Yonemoto, Naruto

doi:10.1049/el.2015.1266

Cited by 14 publications

(10 citation statements)

References 5 publications

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“…The polarization characteristic of the high-voltage power line RCS at 76 GHz band have been evaluated based on the experiments [7]. To detect the power lines by the millimeterwave radar, the vertical polarization is commonly employed to detect the power lines.…”

Section: Circular Polarized 76 Ghz Low Power Radarmentioning

confidence: 99%

“…Fig. 1 shows the measured RCS characteristics of the typical highvoltage power lines [7]. The several reflection peaks are observed between -20 degrees and 20 degrees.…”

Section: Circular Polarized 76 Ghz Low Power Radarmentioning

confidence: 99%

“…The purpose of employing the circular polarization is to improve the detection performance of the high-voltage power lines. We have been developed the millimeter-wave with linear polarized antenna [5], however, it is confirmed from the power line radar cross section (RCS) measurement that the circular polarization is effective to detect the power lines [7]. Firstly, the newly developed circular polarized 76 GHz millimeter-wave radar is discussed with the specifications.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of circular polarization for 76 GHz helicopter collision avoidance radar to improve detection performance of high-voltage power lines

Futatsumori

Amielh

Morioka

et al. 2017

2017 European Radar Conference (EURAD)

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To improve the detection conditions of the highvoltage power lines using the 76 GHz low-transmitting power helicopter collision avoidance forward looking millimeter-wave radar, the characteristics of the circular polarization is experimentally investigated. Firstly, the specifications and the operating parameters of developed circular polarized 76 GHz is discussed. Then, the radar receiving module with the W-band low noise amplifier and the low loss waveguide to microstrip line transitions enables 12 dB receiving noise figure. Finally, the ground power line detection test is carried out to compare the circular polarization and vertical polarization, which are commonly used to detect the power lines. The results confirm the almost 10 dB increase of the reflection signal of the power lines.

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Section: Circular Polarized 76 Ghz Low Power Radarmentioning

confidence: 99%

“…Fig. 1 shows the measured RCS characteristics of the typical highvoltage power lines [7]. The several reflection peaks are observed between -20 degrees and 20 degrees.…”

Section: Circular Polarized 76 Ghz Low Power Radarmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of circular polarization for 76 GHz helicopter collision avoidance radar to improve detection performance of high-voltage power lines

Futatsumori

Amielh

Morioka

et al. 2017

2017 European Radar Conference (EURAD)

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“…Moreover, excessive false-warns would occur. In [7,8,12], it is concluded that the significant backscatters of power lines only exist over narrow aspect angles near the normal incidence at Bragg directions, and this unique Bragg phenomenology is regarded as Bragg pattern. Bragg pattern is often employed to detect power lines with a high detection probability in the presence of background clutter.…”

Section: Introductionmentioning

confidence: 99%

Power line detection in millimetre‐wave radar images applying convolutional neural networks

Xiong

Luo

2021

IET Radar Sonar & Navi

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High-voltage power lines and their supporting towers create hazardous low-altitude flight conditions for helicopters. Herein, a novel power line detection and classification is proposed for millimetre-wave (MMW) radars applying Hough transform (HT) and convolutional neural network (CNN). HT is implemented to detect candidate lines in MMW radar images. Unfortunately, in the presence of background clutter and manmade structures, some false power lines are also brought in, thus it is vital to differentiate the actual power lines. Moreover, it is important to classify the power lines with and without Bragg pattern, and offer different threat levels. The authors firstly introduce the incidence angle and azimuth angle vectors of candidate lines as a supplement to power vectors, and propose a new CNN architecture for classification that uses powerful dense blocks and defined index pooling. With the trick of index pooling, the incidence angle and azimuth angle vectors can be merged with the corresponding power vectors together to mine the features, including those of Bragg pattern. Taking advantage of scale transformation, the proposed network adapts to different input scales. Extensive experiments demonstrate that the proposed method achieves state-of-the-art results and is not sensitive to the input scales and noise levels.Wei Xiong and Jingsheng Luo are co-first authors.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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“…In the automotive radars, 77 GHz millimeter-wave system exists for many years. In addition to car driving safety [3,4], the 76 GHz radar system is also used in helicopter anti-collision [5], unmanned ground vehicle [6,7], etc. The operation frequency is typically in the 76-77 GHz band for frequency-modulated continuous wave (FMCW) or pulse Doppler operation.…”

Section: Introductionmentioning

confidence: 99%

A 77 GHZ Series Fed Weighted Antenna Arrays With Suppressed Sidelobes in E- And H-Plane

Wang¹,

Wang²

2018

PIER Letters

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Abstract-This paper proposes a 77 GHz microstrip series-fed patch antenna array for automotive radar applications. Based on the Taylor Distribution Principle, we designed a six-unit series-fed weighted antenna array. A Wilkinson 1 : 8 un-equal divider is employed to connect eight antenna arrays to form a whole planar antenna. In antenna far-field patterns, the E-plane side-lobe level is approximately below −20.15 dB, and the H-plane side-lobe level is about −15 dB. Good accordance is obtained between simulated and measured results. The designed antenna has great value in the application fields of 77 GHz automotive radar antenna.

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Evaluation of polarisation characteristics of power‐line RCS at 76 GHz for helicopter obstacle detection

Cited by 14 publications

References 5 publications

Investigation of circular polarization for 76 GHz helicopter collision avoidance radar to improve detection performance of high-voltage power lines

Investigation of circular polarization for 76 GHz helicopter collision avoidance radar to improve detection performance of high-voltage power lines

Power line detection in millimetre‐wave radar images applying convolutional neural networks

A 77 GHZ Series Fed Weighted Antenna Arrays With Suppressed Sidelobes in E- And H-Plane

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