Automobile navigation system using beacon information
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A navigation and communication system utilizing roadside beacons is under development. The functions and infrastructure of the Road/Automobile Communication System are outlined, the in-vehicle equipment is described and the results of field tests conducted in the Tokyo/Yokohama area are reported. The system provides the driver with such information as present location and traffic conditions, plots optimum and alternative routes to destination, and enables limited two-way communication to be made. Field testing indicates that the navigation and route-search functions are of great benefit to drivers in an unfamiliar area. However, route-search calculation time must be reduced, especially for route revision in response to incoming data.< Keywords:
Beacon
Navigation System
Electric beacon
The first navigation devices have become the beacons (NDB Non-directional beacon). This radio station, which transmits in all directions your identification signal at a certain frequency. The receiver on the aircraft simply indicates the direction of such a beacon. To determine the position of the aircraft need not less than 2 beacons. However, the accuracy NDB eventually became insufficient. Then the engineers was established VOR all directional radio beacon.The work covers issues relating to the basic principles of operation of the beacon system VOR. Examines the principles, parameters and structure of the standard VOR.
Beacon
Electric beacon
Radio navigation
SIGNAL (programming language)
Radio signal
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Underwater high precision positioning and navigation is a key technical support for underwater accurate operation of autonomous underwater vehicle (AUV). Traditional AUV localization adopts acoustic positioning system (APS) mostly, and long baseline (LBL) is one of the most widely used. LBL can achieve a high positioning accuracy, but multiple acoustic beacons need to be deployed. The deployment, calibrating, and recycling of those beacons are time-consuming and labor-intensive. This article focuses on range-only single-beacon (ROSB) technology to realize AUV localization. Compared to LBL, ROSB can reduce the time and labor of deploying beacons greatly with only one beacon adopted. Aiming at the weakness of initial observation capacity in ROSB, a virtual beacon and adjustment theory-based initial location calculating algorithm is proposed. Furthermore, a ROSB-based underwater multisensor fusion positioning (UMFP) method using factor graph is presented, in which ROSB is fused with other sensors equipped on AUV. Experiments and simulations show that the ROSB based UMFP scheme can not only save time and labor greatly compared to LBL, but also achieve a high positioning accuracy.
Beacon
Sensor Fusion
Electric beacon
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The article describes radio beacon systems and presents a mathematical solution to determine the location of an unmanned aerial vehicle (UAV) equipped with a direction-finding device. This system ensures continuous flight and allows for determining the exact coordinates of targets, regardless of satellite signals. It facilitates the successful completion of combat missions in adverse weather conditions and when using radio electronic warfare (REW) systems based on signals received from radio beacons.
Beacon
Electric beacon
Homing (biology)
Radio navigation
Radio signal
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This paper proposes the localization scheme using ultrasonic beacons in a multi-block workspace. Indoor localization schemes using ultrasonic sensors have been widely studied due to their cheap price and high accuracy. However, ultrasonic sensors are susceptible to environmental noises from their propagation characteristics. On account of their decay phenomena when they are transmitted over a long distance, ultrasonic sensors are not suitable for application in large indoor environments. To overcome these shortages of ultrasonic sensors while emphasizing their advantages, a multi-block approach has been proposed by dividing the indoor space into several blocks with multiple beacons in each block. This approach, however, is hard to divide into several blocks when beacons are not installed in a certain pattern, and in case of having newly installed beacons, all blocks placement is reconstructed. Therefore, this paper proposes a real time localization scheme to estimate the position of mobile robot without effecting beacons placement. Beacon scheduling algorithm has been developed to select the optimal beacons according to robot position and beacon arrangement for the mobile robot navigation. The performance of the proposed localization system is verified through simulations and real experiments.
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Work space
Electric beacon
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In this work an indoor position estimation algorithm will be proposed. The position will be measured by means of a sensor network composed by fixed beacons placed on the indoor environment and a mobile beacon mounted on the object to be tracked. The mobile beacon communicates with all the fixed beacons by means of ultra wide-band signals, and the distance between them is computed by means of time of flight techniques. Moreover, inertial measurements will be used when the position measurements are not available. Two main problems will be considered in the proposed architecture: the fact that the beacons work with a lower update rate than the IMU, and that the mobile beacon can comunicate with only one fixed beacon at a time. Experimental results will be shown in order to validate the effectiveness of the proposed technique.
Beacon
Position (finance)
Radio navigation
Observer (physics)
Electric beacon
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Stanford’s Integrity Beacon Landing System uses
ground-based pseudo-satellite transmitters known as
Integrity Beacons to resolve carrier phase ambiguities on
final approach, giving IBLS both high integrity and
centimeter-level accuracy. This paper discusses two
improved Integrity Beacon designs and the results of
flight tests with these new beacons.
The original Integrity Beacons were not synchronized to
GPS time. The IBLS reference station was required to
measure the beacon carrier phase reference information
using a direct cable connection to each Integrity Beacon,
which proved inconvenient in practice. We therefore
constructed a pair of Autonomaus Integrity Beacons,
pseudolites whose transmitted signals are synchronized
to GPS satellite signals using the Omni-Marker principle
invented at Stanford. Flight tests using these beacons
showed that IBLS performance was maintained with the
reference station in a convenient location some six
kilometers from the beacons.
The original Integrity Beacons produced a short-range
“bubble” of usable signals. While this was sufficient to
demonstrate the IBLS concept, a longer-range beacon
would have additional applications. To this end, we
constructed an Autonomous Integrity Beacon with a
range of greater than four kilometers, using a pulsing
scheme similar to that recommended by RTCM-104 to
alleviate the near/far problem. Flight tests showed that
this long-range beacon provided useful information to
IBLS everywhere within its expanded bubble, without
blocking satellite reception by IBLS or conventional
GPS receivers.
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Electric beacon
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In this paper, We mathematically model the In-Range localization scheme in the presence of a Mobile Beacon. In the In-Range localization scheme, a sensor with unknown location is localized to a disc centered at the position of the beacon, if the sensor under consideration can successfully decode a transmission from the beacon. In our approach a Mobile Beacon guided by a mobility model is used to generate the virtual beacons, there by eliminating the need to deploy static beacons that are required in the classical In-Range localization scheme. For analysis, we consider a Mobile Beacon guided by the Random Way Point (RWP) mobility model with In-Range localization scheme. The main contribution of this paper consists of mathematical models for the In-Range localization parameters in the presence of a Mobile Beacon guided by the RWP mobility model.
Beacon
Electric beacon
Mobility model
Position (finance)
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Beacon
Work space
Electric beacon
Position (finance)
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Beacon nodes are playing an important role in wireless sensor networks(WSNs) localization,which are used as the reference nodes to calculate the target position.But,the unnoticed changes of locations of some beacons may occur because of various reasons in the actual environment of WSNs applications.So,the moved beacons may become unreliable nodes and at this time if we depend on the moved beacon nodes to locate the unknown node may affect the localization precision,and even lost the use value.A scheme of beacon movement detection based on the available beacon(BAB—BMD) is proposed,aiming at the problem of beacon node movement.This algorithm detects all the beacon nodes and calculates reliability for each beacon which is received by the unknown nodes before the localization.Then select the high reliability of beacon nodes as the reference nodes in the first place for localization which is beacon optimal selection based on the available beacon(BAB—BOS).Experimental results show that BAB— BMD has good detection for beacon movement.At the same time,BAB—BOS also has a better positioning accuracy compared with no detection of beacon movement and discard the moved beacon.
Beacon
Electric beacon
Molecular beacon
Location awareness
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This paper proposes a scheme for position estimation of randomly deployed sensor nodes in a wireless sensor network. Without GPS capability on any of the sensors, the position estimation is facilitated by beacons that move within the network. The beacons are equipped with GPS and can broadcast messages that contain the beacon identifiers and their current positions. With erroneous boundary beacon positions captured at the sensor, the sensor calculates its own position iteratively and updates the estimates upon newly acquired beacon positions. Practical implementation issues are discussed and simulation results show that the proposed iterative approach converges quickly even with beacon positions that have large errors.
Beacon
Electric beacon
Position (finance)
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Citations (18)