Analysis of course errors on CVOR antennas (including effects of mutual coupling between elements)

Wakabayashi, Ryoji; Kawakami, Haruo; Sato, G.; Amano, Takahiro; Suzuki, Yasoji

doi:10.1109/25.669078

Cited by 4 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This rotational motion can be plotted as a sine function (Figure 4). The timing must be accurate and, at the same time, the same for the antenna multiplexer and the rest of the targeting system [19][20][21][22][23][24][25].…”

Section: Design Of the Targeting System Idvormentioning

confidence: 99%

“…The ground targeting system considered in the article was not only designed but also experimentally tested. The principle of operation of the targeting/tracking device is ideologically derived from the approach navigation system DVOR (Doppler VHF Omnidirectional Radio Range), which has long been used in aviation [19][20][21][22]. The undeniable advantage of this newly built system for the method of localisation is, above all, the speed of UAV search and precise directional navigation to this point in unknown terrain without the need to use a map or GPS device (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Reasonable Alternative System for Searching UAVs in the Local Area

Češkovič

Kurdel

Gecejová

et al. 2022

Sensors

View full text Add to dashboard Cite

UAVs, used for professional purposes, often intervene in unfamiliar terrain and challenging conditions. Unlike recreational UAVs, such professional and specialised UAVs are very expensive to develop and operate, and their value is not negligible. Due to the nature of operations in an unknown or dangerous environment, there are also situations with forced interruption and termination of the flight mission or a collision with the environment. Locating a lost vehicle presents a new challenge for UAV operators. The possibilities of today’s localised commercial aircraft in distress (COSPASS/SARSAT systems) are undesirable for selective special-purpose drones. The optimisation of the location in the event of an emergency or catastrophic landing may be justified by a social or other condition, where the user wants to search for the device by a system other than the one experienced for rescuing people, ideally on their reserved frequencies. The article proposes a new approach to solving the problem based on the design of a terrestrial localisation system based on the methods of processing and correlation of the obtained data by the physical principle of the Doppler effect and its own system adaptation. This creates an innovative concept of a targeting system based on the broadcasting of distress (VHF) signal by crashed UAV. This signal is captured and evaluated by the IDVOR system, making it possible to determine the direction in which the searched UAV is placed. In order to determine the difference between standard targeting systems of the UAV, which use information about position (exact coordinates (x,y,z)), the IDVOR system is able to determine direction, independent of other systems in every “enemy” or “inhospitable” territory.

show abstract

Section: Design Of the Targeting System Idvormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Reasonable Alternative System for Searching UAVs in the Local Area

Češkovič

Kurdel

Gecejová

et al. 2022

Sensors

View full text Add to dashboard Cite

show abstract

“…Diese kann jedoch bei nicht idealen Vorraussetzungen für die Ausbreitung der elektromagnetischen Wellen prinzipiell durch diverse Effekte verfälscht werden (Yamamoto und Nagaoka, 1989;Wakabayashi et al, 1998). Um die sehr komplexen Zusammenhänge zwischen einzelnen Feldparametern und dem entstehenden Winkelfehler durch Zerlegung in einzelne Signalkomponenten erfassen zu können und dabei den Aufwand der Simulationen auf ein vertretbares Maß zu reduzieren, beschränkt sich diese Untersuchung auf die Beeinflussung der Trägerfeldstärke der DVOR-Anlage.…”

Section: Introductionunclassified

Reflexionseigenschaften von Windenergieanlagen im Funkfeld von Funknavigations- und Radarsystemen

2015

View full text Add to dashboard Cite

Abstract. Die hier behandelte Untersuchung befasst sich mit den Störungen des elektrischen Feldes einer Doppler Very High Frequency Omnidirectional Radio Range Navigationsanlage (DVOR) in der Gegenwart von Windenergieanlagen (WEA). Hierfür wird die Feldstärke auf 25 konzentrischen Kreisbahnen, sog. Orbit Flights verschiedener Höhen und mit verschiedenen Radien rund um die DVOR-Anlage numerisch simuliert. Insbesondere werden die Einflüsse diverser Parameter der WEA wie deren Anzahl, Position, Rotorwinkel, Turmhöhe und Rotordurchmesser auf die Feldverteilung herausgestellt, sowie die Anwendbarkeit der Simulationsmethode Physical Optics (PO) durch Vergleich der Simulationsergebnisse mit denen der Multi Level Fast Multipol Method (MLFMM) untersucht.

show abstract