Wyniki wyszukiwania - BazTech

1

Protecting vehicles vulnerable to terrorist attacks, such as GNSS jamming, by electromagnetic interference shielding of antenna

Dobryakova L., Lemieszewski Ł., Ochin E.

Zeszyty Naukowe Akademii Morskiej w Szczecinie

|

2017

|

nr 50 (122)

77--83

EN

Spoofing, anti-spoofing, jamming and anti-jamming technologies have become an important research topic within the GNSS discipline. While many GNSS receivers leave a large space for signal dynamics, enough power space is left for the GNSS signals to be spoofed and/or jammed. The goal of spoofing is to provide the receiver with a misleading signal, fooling the receiver into using fake signals in the extra space for positioning calculations. The receiver will then generate a false position, thus misleading the navigator. The goal of jamming is to add noise to the satellite signal which leads to fooling the receiver into using “signals plus noise” for positioning calculations. This article discusses the approach to anti-jamming based on the shielding of antennas from the signal jammer.

2

The vulnerability of unmanned vehicles to terrorist attacks such as Global Navigation Satellite System spoofing

Dobryakova L., Lemieszewski Ł., Ochin E.

Zeszyty Naukowe Akademii Morskiej w Szczecinie

|

2016

|

nr 46 (118)

181--188

EN

Spoofing, anti-spoofing, jamming, and anti-jamming algorithms have become an important research topic within the Global Navigation Satellite System (GNSS) discipline. While many GNSS receivers leave large space for signal dynamics, enough power space is left for the GNSS signals to be spoofed. GNSS signal power on the earth’s surface is around 160 dBW. The goal of spoofing is to provide the receiver with a slightly more powerful misleading signal, stronger than the original GNSS signal, fooling the receiver into using fake signals for positioning calculations. The receiver will generate a misleading position of the navigator. Practical spoofing that provides misleading navigation results of the receiver is difficult to conduct due to the signal infrastructure. Using trivial anti-spoofing algorithms in GNSS receivers, spoofing attacks can be easily detected. The article discusses the vulnerability of unmanned vehicles and provides an approach to anti-spoofing based on measuring distance between two antennas.

3

On the application of GNSS signal repeater as a spoofer

Dobryakova L., Ochin E.

Zeszyty Naukowe / Akademia Morska w Szczecinie

|

2014

|

nr 40 (112)

53--57

EN

Spoofing and antispoofing algorithms have become an important research topic within the GNSS discipline. The power of the GNSS signal on the earth’s surface averages –160 dBw. While many GNSS receivers leave large space for signal dynamics, enough power space is left for the GNSS signals to be spoofed. The goal of spoofing is to provide the receiver with a misleading signal, fooling the receiver to use fake signals in space for positioning calculations. The receiver will produce a misleading position solution. The purpose of this paper is to analyze the vulnerability of the satellite signal in repeater’s output from the viewpoint of GNSS spoofing attacks. The article discusses a new approach to GNSS spoofing, based on the application of GNSS signals repeating by potential terrorists. Practical spoofing that provides misleading navigation results at the receiver is difficult to conduct due to the signal infrastructure, and by applying trivial anti-spoofing algorithms in GPS receivers, spoofing attack can be easily detected. To detect spoofing attacks of this type we have a variety of methods. For example, the authors suggest the use of paired navigators and GNSS compasses as detectors of GNSS spoofing.

4

Bezprzewodowy system detekcji magnetycznej

Studziński J.

Zeszyty Naukowo-Techniczne Stowarzyszenia Inżynierów i Techników Komunikacji w Krakowie. Seria: Materiały Konferencyjne

|

2009

|

Nr 89, z. 146

187-193

PL

System Bezprzewodowej Detekcji Pojazdów wykorzystuje zamontowane pod powierzchnią ziemi sensory magnetyczne do wykrywania obecności pojazdów. Sensory przekazują informację o pojazdach drogą radiową do odbiornika, który z kolei przesyła tą informację do sterownika ruchu drogowego. Jeżeli sensory znajdują się poza zasięgiem odbiornika, stosuje się wzmacniacz, który będzie pośredniczył w przekazywaniu informacji od sensora. System Detekcji Magnetycznej jest alternatywą dla powszechnie stosowanych innych rodzajów detekcji takich jak pętle indukcyjne lub Wideodetekcja.

EN

Wireless Magnetic Detection System uses the pavement-mounted magnetic sensors to detect the presence and the movement of vehicles. The magneto-resistive sensors are wireless, transmitting their detection data in real-time via low-power radio technology to a nearby Access Point (or Repeater) that then relays the data to one or more local or remote traffic management controllers and systems. Wireless Magnetic Detection System can be used as an alternative for the cameras or the inductive loops.

5

Parametry transmisyjne wzmacniaka w zespołach separacji iskrobezpiecznej

Miśkiewicz K., Wojaczek A.

Zeszyty Naukowe. Górnictwo / Politechnika Śląska

|

2005

|

z. 269

515-522

PL

Podstawowym elementem zespołów separacji iskrobezpiecznej jest przetwornica. Przetwornica tłumi transmitowane sygnały akustyczne. Dla kompensacji tłumienia zastosowano w zespole separacji iskrobezpiecznej wzmacniak. W referacie przedstawiono uproszczony schemat zastępczy wzmacniaka. Przeprowadzono analizę metodą potencjałów węzłowych. Uzyskano analityczne zależności pozwalające obliczyć wzmocnienie jak również elementy macierzy łańcuchowej wzmacniaka.

EN

The main element of intrinsically safe barrier is DC/DC converter. DC/DC converter attenuates the acoustic signals transmitted through the barrier. The repeater is used for compensation of attenuation caused by converter. The paper presents a simplified equivalent diagram of a repeater. Transmission properties of the repeater were analysed by Coltri method. The analysis gives a formulas for effective gain and elements of chain matrix of repeater.