A Feasibility Study on a Regional Navigation Transceiver System

Park, Byungwoon; Kim, Doyoon; Lee, Taikjin; Kee, Changdon; Paik, Bok-Soo; Lee, Kihoon

doi:10.1017/s0373463307004481

Cited by 8 publications

(5 citation statements)

References 4 publications

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“…In addition, most existing systems rely on GNSS systems to obtain the UAVs' locations, which is unrealistic in jamming environments [13]. In [38], ground reference stations (GRSs) with known positions were used to locate UAVs, which is a potential solution to the problem of UAV self-localization in GNSS-denied environments. Nevertheless, jamming was still not taken into account in this research.…”

Section: B Related Workmentioning

confidence: 99%

“…In most existing research on UAV-enabled positioning, the UAV's location information is commonly assumed to be perfectly known [22], [24]. In practice, the self-localization and clock synchronization of UAVs rely on measurements provided by satellites, GRSs or other UAVs [26], [27], which will also be inaccurate under jamming attacks. Therefore, in addition to affecting the positioning services for users, jamming will also cause anchor position and clock uncertainty in UAV-enabled positioning systems.…”

Section: B Related Workmentioning

confidence: 99%

“…Thus, the CRLB that could be achieved by ML method is used to indicate the theoretical performance of UAV self-localization in the presence of jamming. Since the TDoA vector d G→V and DR-TWR vector r V →V are independent of each other, the log-likelihood function of the measurement vector o V can be expressed as (26) where f (d G→V ; v) and f (r V →V ; v) are likelihood functions of TDoA measurements and DR-TWR measurements, respectively. The expressions of f (d G→V ; v) and f (r…”

Section: A Crlb Of Uav Self-localizationmentioning

confidence: 99%

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Feasibility Study of UAV-Assisted Anti-Jamming Positioning

Wang

Liu

et al. 2021

IEEE Trans. Veh. Technol.

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As the cost and technical difficulty of jamming devices continue to decrease, jamming has become one of the major threats to positioning service. Unfortunately, most conventional wireless positioning technologies are vulnerable to jamming attacks due to inherent shortcomings like weak signal strength and unfavorable anchor geometry. Thanks to their high operational flexibility, unmanned aerial vehicles (UAVs) could be a promising solution to the above challenges. Therefore, in this article, we propose a UAV-assisted anti-jamming positioning system, in which multiple UAVs first utilize time-difference-ofarrival (TDoA) measurements from ground reference stations and double-response two-way ranging (DR-TWR) measurements from UAV-to-UAV links to perform self-localization as well as clock synchronization, and then act as anchor nodes to provide TDoA positioning service for ground users in the presence of jamming. To evaluate the feasibility and performance of the proposed system, we first derive the Cramér-Rao lower bound (CRLB) of UAV self-localization. Then, the impacts of UAV position uncertainty and synchronization errors caused by jamming on positioning service are modeled, and the theoretical root-mean-square error (RMSE) of user position estimate is further derived. Numerical results demonstrate that the proposed system is a promising alternative to existing positioning systems when their services are disrupted by jamming. The most notable advantage of the proposed system is that it is fully compatible with existing user equipment terminals and positioning methods. Index Terms-Unmanned aerial vehicle (UAV), anti-jamming positioning, time-difference-of-arrival (TDoA), double-response two-way ranging (DR-TWR).

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Section: B Related Workmentioning

confidence: 99%

Section: B Related Workmentioning

confidence: 99%

Section: A Crlb Of Uav Self-localizationmentioning

confidence: 99%

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Feasibility Study of UAV-Assisted Anti-Jamming Positioning

Wang

Liu

et al. 2021

IEEE Trans. Veh. Technol.

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“…Consequently, the system can cover a larger area than a ground-based pseudolite system, and the multipath effect is decreased. However, the positions of airborne pseudolites must be monitored to achieve accurate service, and delays in monitoring degrade the system accuracy [ 9 , 10 , 11 , 12 ]. In both of these pseudolite-based positioning systems, the user position accuracy is not high because the pseudolites are located at biased positions on the same plane with respect to the user.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Positioning Algorithm of ARPS for Improving Accuracy and Expanding Service Coverage

Lee

Baek

Lim

2016

Sensors

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The airborne relay-based positioning system (ARPS), which employs the relaying of navigation signals, was proposed as an alternative positioning system. However, the ARPS has limitations, such as relatively large vertical error and service restrictions, because firstly, the user position is estimated based on airborne relays that are located in one direction, and secondly, the positioning is processed using only relayed navigation signals. In this paper, we propose an enhanced positioning algorithm to improve the performance of the ARPS. The main idea of the enhanced algorithm is the adaptable use of either virtual or direct measurements of reference stations in the calculation process based on the structural features of the ARPS. Unlike the existing two-step algorithm for airborne relay and user positioning, the enhanced algorithm is divided into two cases based on whether the required number of navigation signals for user positioning is met. In the first case, where the number of signals is greater than four, the user first estimates the positions of the airborne relays and its own initial position. Then, the user position is re-estimated by integrating a virtual measurement of a reference station that is calculated using the initial estimated user position and known reference positions. To prevent performance degradation, the re-estimation is performed after determining its requirement through comparing the expected position errors. If the navigation signals are insufficient, such as when the user is outside of airborne relay coverage, the user position is estimated by additionally using direct signal measurements of the reference stations in place of absent relayed signals. The simulation results demonstrate that a higher accuracy level can be achieved because the user position is estimated based on the measurements of airborne relays and a ground station. Furthermore, the service coverage is expanded by using direct measurements of reference stations for user positioning.

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“…Before the launching of GPS (Global Positioning System) satellites, pseudolites were used to test transmitters at the desert test ranges [ 3 ]. For the last twenty years, many researchers have extended the applications of these systems to various areas, including indoor positioning, the Mars navigation system and regional positioning systems [ 4 , 5 , 6 , 7 , 8 , 9 ]. The ground-based radio navigation system has been studied as a regional positioning system of which the main applications are air vehicles.…”

Section: Introductionmentioning

confidence: 99%

Flight Test Result for the Ground-Based Radio Navigation System Sensor with an Unmanned Air Vehicle

Jang

Ahn

Seo

et al. 2015

Sensors

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The Ground-based Radio Navigation System (GRNS) is an alternative/backup navigation system based on time synchronized pseudolites. It has been studied for some years due to the potential vulnerability issue of satellite navigation systems (e.g., GPS or Galileo). In the framework of our study, a periodic pulsed sequence was used instead of the randomized pulse sequence recommended as the RTCM (radio technical commission for maritime services) SC (special committee)-104 pseudolite signal, as a randomized pulse sequence with a long dwell time is not suitable for applications requiring high dynamics. This paper introduces a mathematical model of the post-correlation output in a navigation sensor, showing that the aliasing caused by the additional frequency term of a periodic pulsed signal leads to a false lock (i.e., Doppler frequency bias) during the signal acquisition process or in the carrier tracking loop of the navigation sensor. We suggest algorithms to resolve the frequency false lock issue in this paper, relying on the use of a multi-correlator. A flight test with an unmanned helicopter was conducted to verify the implemented navigation sensor. The results of this analysis show that there were no false locks during the flight test and that outliers stem from bad dilution of precision (DOP) or fluctuations in the received signal quality.

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A Feasibility Study on a Regional Navigation Transceiver System

Cited by 8 publications

References 4 publications

Feasibility Study of UAV-Assisted Anti-Jamming Positioning

Feasibility Study of UAV-Assisted Anti-Jamming Positioning

Enhanced Positioning Algorithm of ARPS for Improving Accuracy and Expanding Service Coverage

Flight Test Result for the Ground-Based Radio Navigation System Sensor with an Unmanned Air Vehicle

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