Design of Future UAV-Relay Tactical Data Link for Reliable UAV Control and Situational Awareness

Baek, Hoki; Lim, Jaesung

doi:10.1109/mcom.2018.1700259

Cited by 108 publications

(52 citation statements)

References 12 publications

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“…To verify the proposed structure, the 1 × 4 array antenna having the center frequency of 5.9 GHz was implemented with the same Taconic TLX-9 substrate (relative permittivity of 2.5 and thickness of 1.1 mm) used for simulation. The fabricated antenna has the volume of 45 × 45 × 43 mm 3 corresponding to 0.88 × 0.88 × 0.83 λo 3 where λo denotes a free space wavelength. The detailed geometric parameters for the proposed antenna can be found in Table 1 and the fabricated antenna is shown in Figure 9.…”

Section: Measured Resultsmentioning

confidence: 99%

“…Thus, in this paper, a new antenna array structure optimized for UAV-mounted sensor applications was proposed and verified at 5.9 GHz. The proposed antenna array was configured by four identical super J-pole antennas with 2-dimensional ground reflectors, and the fabricated volume was about 0.88 x 0.88 x 0.83 λo 3 . Each proposed antenna element showed a tilted beam characteristic in the elevation angle and a wide HPBW around the azimuth angle.…”

Section: Discussionmentioning

confidence: 99%

“…Since the use of unmanned aerial vehicles (UAV) has become an effective technique for various areas, such as aerial security surveillance, public safety, structural health and safety monitoring, automated inventory, and agricultural applications [1][2][3][4][5], UAV-based technologies are being widely studied due to the allowable flexibility and 3-dimensional mobility. Using drones for wireless communication and aerial base stations are other exemplary topics of research [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Tilted-Beam Switched Array Antenna for UAV Mounted Radar Applications with 360° Coverage

et al. 2019

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A highly efficient antenna array for unmanned aerial vehicle (UAV) mounted radar applications with a tilted-beam characteristic and a 360° beam coverage is proposed in this paper. The proposed array antenna is configured by four planar super J-pole antennas with 2-dimensional ground reflectors. Each super J-pole antenna element provides a high directivity where the peak gain is tilted about 45° facing toward the ground from the bottom of a UAV body. Thus, the air-to-ground communication difficulty due to the altitude difference between the UAV and ground targets can be effectively solved. Further, the four super J-pole elements with a switched operation can cover the whole 360° areas around the UAV while high antenna gain is maintained. To verify the performance, the proposed structure was implemented at 5.9 GHz with an overall volume of 0.88 × 0.88 × 0.83 λo3. The measured 10-dB impedance bandwidths for all four antenna elements were better than 27.2% and the isolation among the four antenna ports was also always better than 13 dB. The measured peak gain was better than 7.4 dBi and tilted at 45° in the elevation angle. Lastly, the measured half power beam widths in elevation and azimuth planes were more than 60° and 87°, respectively.

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Section: Measured Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tilted-Beam Switched Array Antenna for UAV Mounted Radar Applications with 360° Coverage

et al. 2019

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“…Unmanned aerial vehicles (UAVs) have attracted great interest from the industry and academia to be utilized in serving a multitude of applications that include surveillance, monitoring, rescue operations, telecommunication, military, Internet of Things (IoT) communication [2]- [3], and public safety operations [4]. UAVs provide effective solution to serve temporary high traffic demands during high crowd events such as festivals, concerts, and stadium games.…”

Section: Introductionmentioning

confidence: 99%

Utility-Aware Optimal Resource Allocation Protocol for UAV-Assisted Small Cells With Heterogeneous Coverage Demands

Lohan

Mishra

2020

IEEE Trans. Wireless Commun.

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In this paper, we consider a UAV-assisted smallcell having heterogeneous users with different data rate and coverage demands. Specifically, we propose a novel utility-aware resource-allocation protocol to maximize the utility of UAV by allowing it to simultaneously serve the highest possible number of heterogeneous users with available energy resources. In this regard, first we derive a closed-form expression for rate-coverage probability of a user considering Rician fading to incorporate the strong line of sight (LoS) component in UAV communication. Next since this UAV utility maximization problem is non-convex and combinatorial, to obtain the global optimal resource allocation policy we propose an iterative feasibility checking method for fixed integers ranging from lower to upper bound on the number of users that can be served by UAV. To further reduce the complexity, we formulate an equivalent problem aimed at minimizing per user energy consumption, where tight analytical relaxation on rate-coverage probability constraint is used along with semiclosed expressions for joint-optimal power and time allocation. Lastly, via detailed numerical investigation, we validate our analytical claims, present insights on the impact of key system parameters, and demonstrate that 60% more users can be served using the proposed scheme as compared to relevant benchmarks.

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“…In recent years, unmanned aerial vehicles (UAVs) have played a critical role in various technical fields, such as warfare systems, security and surveillance, structural health monitoring, unmanned delivery, agricultural applications, and communication applications [1][2][3][4][5]. Typically, drones have been used widely more than ever in a variety of industries, with the increasing demand for drone-based sensors and radars, drone-based aerial base stations, autonomous drones for emergency response, and so on [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Compact Switched-Beam Array Antenna with a Butler Matrix and a Folded Ground Structure

Kim

Dong

et al. 2019

Electronics

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A compact switched-beam array antenna, based on a switched Butler matrix with four folded ground antennas, is presented for unmanned aerial vehicle (UAV) applications. The folded ground structure, including a slotted patch radiator surrounded by multiple air-gapped ground layers, is adopted to maximize compactness. The extra ground layers provide extra capacitive coupling around the patch antenna, resulting in a down-shift of resonant frequency and a reduction in the antenna size. Also, to optimize aerial operation with a wider beam coverage, the 1 × 4 array is integrated with a switched Butler matrix controlled by a microcontroller unit (MCU). The choice of the Butler matrix reduces the complexity of beamforming circuitry and avoids the use of high-cost phase shifters requiring extra control-bit signals. Further, the array antenna is optimized for high isolation among the antenna ports and a minimal UAV body effect. Then, the proposed structure was verified at 1.96 GHz for test purposes only, and the array size, excluding the antenna case, was 2.16λo × 0.54λo × 0.07λo. The measured 10 dB impedance bandwidth for all antenna elements in the array was always better than 3.4%, and the isolation among the antenna ports was also better than 19 dB. The measured peak gain, excluding the loss of the switched Butler module, was about 9.98 dBi, on average. Lastly, the measured peak scan angles were observed at −39°, −17°, 9° and 31° according to switching modes.

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Design of Future UAV-Relay Tactical Data Link for Reliable UAV Control and Situational Awareness

Cited by 108 publications

References 12 publications

Tilted-Beam Switched Array Antenna for UAV Mounted Radar Applications with 360° Coverage

Tilted-Beam Switched Array Antenna for UAV Mounted Radar Applications with 360° Coverage

Utility-Aware Optimal Resource Allocation Protocol for UAV-Assisted Small Cells With Heterogeneous Coverage Demands

Compact Switched-Beam Array Antenna with a Butler Matrix and a Folded Ground Structure

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