A New Unmanned Aerial Vehicle Synthetic Aperture Radar for Environmental Monitoring

Koo, Voon Chet; Chan, Yee Kit; Vetharatnam, Gobi; Chua, Ming Yam; Lim, Chot Hun; Lim, Chu Sing; Thum, C.; Lim, Theam Soon; Ahmad, Zahid bin; Mahmood, Khairul Annuar; Shahid, Mohd.; Ang, C. Y.; Tan, Wei; Tan, Poi Ngee; Yee, Kuo Shen; Cheaw, Wen Guey; Boey, Huey Shen; Choo, A. L.; Sew, and Bee Cheng

doi:10.2528/pier11092604

Cited by 105 publications

(64 citation statements)

References 24 publications

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“…Radiation from slots and seams is of greater concern as the speed of the electronic designs increases [9][10][11][12][13][14][15][16][17]. Thin-slot formalism permits inclusion of conducting plates with arbitrarily narrow apertures or gaps without requiring any corresponding need to reduce the cell size to the gap width or depth for the FDTD analysis.…”

Section: Introductionmentioning

confidence: 99%

A Simple Local Approximation FDTD Model of Short Apertures With a Finite Thickness

Xiong¹,

Chen²,

Mao³

et al. 2012

PIER

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Abstract-This paper brings forward a simple local approximation finite-difference time-domain (FDTD) method for the analysis of short apertures with a finite thickness. By applying the equivalence principle together with a simple local approximation, the varying field distribution is accurately derived. The updating equations for the slot field can be derived by casting the field distributions into the contour paths containing the apertures. The method has been applied to two problems and the results are compared with the high-resolution standard FDTD simulation results and the measurement results. The accuracy of the proposed method is verified from the comparison of both the field distribution and the time-domain and frequency-domain slot coupling results. It is demonstrated that the local approximation is highly efficient and timesaving, and the present method is stable, numerically and computationally efficient.

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Section: Introductionmentioning

confidence: 99%

A Simple Local Approximation FDTD Model of Short Apertures With a Finite Thickness

Xiong¹,

Chen²,

Mao³

et al. 2012

PIER

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“…Figure 1 shows the obtained curve, which characterizes the decrease in the power density and efficiency as a power change function. The curve is based on the analysis of promising developments and industrially produced HSPM of the aviation systems [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Figure 1 shows that the minimum achieved energy density of commercial high-speed SG of the UAVs is 0.32-0.33 kg/kW at the power below 5 kW.…”

Section: Research Landscapementioning

confidence: 99%

“…In addition to UAVs with a turbojet engine, the tasks of creating high-efficiency SGs are also in the UAVs on electric traction. Now the main direction of their development is the use of hybrid schemes, where the SG is the main energy source for the traction motor and largely determines the UAV capabilities, flight time and its speed characteristics [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Design, Optimization and Initial Testing of a High-Speed 5-Kw Permanent Magnet Generator for Aerospace Application

Исмагилов¹,

Vavilov²,

Miniyarov³

et al. 2017

PIER C

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Abstract-The article presents a new topology of the high-speed synchronous electrical machines with permanent magnets with the tooth-coil windings with a stator magnetic core made of amorphous alloys for prospective unmanned aerial vehicles. This is a multidisciplinary design algorithm with optimization elements, which are proposed to design such machines. Based on the proposed algorithm, calculations of several topologies were performed by using computer simulation methods. In addition, the analysis of the rotor dynamics as part of the turbojet engine of the unmanned aerial vehicle and the calculations of the mechanical rotor strength were performed. To minimize the eddy-current losses in permanent magnets, the multicriteria optimization of the slotted zone was carried out by using genetic algorithms. A cooling system was proposed, and thermal calculations were performed. To verify the proposed design algorithm and to evaluate the efficiency of the amorphous alloy, a full-sized 5 kW experimental sample with a rotational speed of 60,000 rpm was created. Results can be used to create new promising UAVs and to design electrical machines for other industrial applications.

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“…In this paper, the azimuth resolution degradation (defocusing) is analyzed since this effect is more important than the problem of the side lobes for the multi-look processing, especially for airborne SAR systems [5,6,21]. Thus, the influence of the phase errors on the azimuth resolution of multi-look SAR images is analyzed.…”

Section: Introductionmentioning

confidence: 99%

Effects of Local Phase Errors in Multi-Look Sar Images

Bezvesilniy¹,

Gorovyi²,

Vavriv³

2013

PIER B

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Abstract-The synthetic aperture radar (SAR) is a widely used instrument for high-resolution imaging from aircraft or satellite platforms. In the paper, the problem of the defocusing of multilook SAR images by uncompensated phase errors presented in the received data is analyzed. It is shown that the phase errors on a multi-look processing interval can be effectively described in terms of local quadratic and local linear phase errors. Approximate analytical expressions are derived to describe the azimuth resolution degradation. Criteria for acceptable phase errors are given. The obtained results are verified by numerical simulations. The approach is illustrated by two typical motion errors: slow deflections of a SAR platform trajectory from a reference flight line and periodic trajectory deviations.

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A New Unmanned Aerial Vehicle Synthetic Aperture Radar for Environmental Monitoring

Cited by 105 publications

References 24 publications

A Simple Local Approximation FDTD Model of Short Apertures With a Finite Thickness

A Simple Local Approximation FDTD Model of Short Apertures With a Finite Thickness

Design, Optimization and Initial Testing of a High-Speed 5-Kw Permanent Magnet Generator for Aerospace Application

Effects of Local Phase Errors in Multi-Look Sar Images

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