Radar/electro-optical data fusion for non-cooperative UAS sense and avoid

Fasano, Giancarmine; Accardo, Domenico; Tirri, Anna Elena; Moccia, Antonio; Lellis, Ettore De

doi:10.1016/j.ast.2015.08.010

Cited by 61 publications

(25 citation statements)

References 15 publications

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“…The differential frequency value of the common channel was divided by two after reading. The measured altitude Hm = Fd/34 could be evaluated through the constant of radio altimeter (K = 34) by dividing the measured value of the differential frequency [13]. Laboratory double-channel radio altimeter block diagram created from two one-channel radio altimeters: LFG is the low-frequency generator, HFG is the high-frequency generator, PS 90 • is the 90-degree phase shifter, At is the attenuator, M is the mixer, DS is the signal divider, LFA is the low-frequency amplifier, ADC is the analog-to-digital converter, SS is the signal summator, PC is the pulse counter, DCA is the direct current amplifier, TA is the transmitting antenna, RA is the receiving antenna, H is the altitude, Electronics 2018, 7, x FOR PEER REVIEW 6 of 9 Figure 5.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Possibilities of Increasing the Low Altitude Measurement Precision of Airborne Radio Altimeters

et al. 2018

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The paper focuses on the new trend of increasing the accuracy of low altitudes measurement by frequency-modulated continuous-wave (FMCW) radio altimeters. The method of increasing the altitude measurement accuracy has been realized in a form of a frequency deviation increase with the help of the carrier frequency increase. In this way, the height measurement precision has been established at the value of ±0.75 m. Modern digital processing of a differential frequency cannot increase the accuracy limitation considerably. It can be seen that further increase of the height measurement precision is possible through the method of innovatory processing of so-called height pulses. This paper thoroughly analyzes the laws of height pulse shaping from the differential frequency presented by the number that represents the information about the measured altitude for this purpose. This paper presents the results of the laboratory experimental altitude measurement with the use of a so-called double-channel method. The application of obtained results could contribute to the increase of air traffic safety, mainly in the phase of the aircraft approaching for landing and landing itself.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Possibilities of Increasing the Low Altitude Measurement Precision of Airborne Radio Altimeters

et al. 2018

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“…Substitution of the critical height in Equation (11) from Equation (1) produces the basic equation of a radio altimeter presented in a completely different way from the generally known one, with the use of geometric similarity of triangles [18][19][20]:…”

Section: Number Of Stable Pulses In Range Of Critical Heightmentioning

confidence: 99%

Low Altitude Measurement Accuracy Improvement of the Airborne FMCW Radio Altimeters

et al. 2019

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This manuscript focuses on the analysis of a critical height of radio altimeters that can help for the development of new types of aeronautical radio altimeters with increased accuracy in measuring low altitudes. Altitude measurement accuracy is connected with a form of processing the difference signal of a radio altimeter, which carries information on the measured altitude. The definition of the altitude measurement accuracy is closely linked to the value of a critical height. Modern radio altimeters with digital processing of a difference signal could shift the limit of accuracy towards better values when the basics of the determination of critical height are thoroughly known. The theory results from the analysis and simulation of dynamic formation and the dissolution of the so-called stable and unstable height pulses, which define the range of the critical height and are presented in the paper. The theory is supported by a new method of derivation of the basic equation of a radio altimeter based on a critical height. The article supports the new theory of radio altimeters with the ultra-wide frequency deviation that lead to the increase the accuracy of a low altitude measurement. Complex mathematical analysis of the dynamic formation of critical height and a computer simulation of its course supported by the new form of the derivation of the basic equation of radio altimeter guarantee the correctness of the new findings of the systematic creation of unstable height pulses and the influence of their number on the altitude measurement accuracy. Application of the presented findings to the aviation practice will contribute to increasing the accuracy of the low altitude measurement from an aircraft during its landing and to increasing air traffic safety.

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“…Like many other cyber-physical systems, the development of drones-which we take here for convenience as also including UAV (Unmanned Aerial Vehicle) systems-is growing at a remarkable rate [1][2][3][4][5][6][7] in terms of on-board sensing, computing, communication, hovering and locomotion capabilities. There is also increasing diversity in their design, particularly among smaller autonomous drones which can hover and maneuver freely and are sweeping the commercial market [7].…”

Section: Introductionmentioning

confidence: 99%

Using Competition to Control Congestion in Autonomous Drone Systems

Manrique

Johnson

2017

Electronics

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With the number and variety of commercial drones and UAVs (Unmanned Aerial Vehicles) set to escalate, there will be high future demands on popular regions of airspace and communication bandwidths. This raises safety concerns and hence heightens the need for a generic quantitative understanding of the real-time dynamics of multi-drone populations. Here, we explain how a simple system design built around system-level competition, as opposed to cooperation, can be used to control and ultimately reduce the fluctuations that ordinarily arise in such congestion situations, while simultaneously keeping the on-board processing requirements minimal. These benefits naturally arise from the collective competition to choose the less crowded option, using only previous outcomes and built-in algorithms. We provide explicit closed-form formulae that are applicable to any number of airborne drones N, and which show that the necessary on-board processing increases slower than N as N increases. This design therefore offers operational advantages over traditional cooperative schemes that require drone-to-drone communications that scale like N 2 , and also over optimization and control schemes that do not easily scale up to general N. In addition to populations of drones, the same mathematical analysis can be used to describe more complex individual drones that feature N adaptive sensor/actuator units.

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Radar/electro-optical data fusion for non-cooperative UAS sense and avoid

Cited by 61 publications

References 15 publications

Possibilities of Increasing the Low Altitude Measurement Precision of Airborne Radio Altimeters

Possibilities of Increasing the Low Altitude Measurement Precision of Airborne Radio Altimeters

Low Altitude Measurement Accuracy Improvement of the Airborne FMCW Radio Altimeters

Using Competition to Control Congestion in Autonomous Drone Systems

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