The Decca Navigator system for ship and aircraft use

Powell, Claud

doi:10.1049/pi-b-1.1958.0037

Cited by 8 publications

(3 citation statements)

References 2 publications

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“…Their main problem is that they demand a high synchronization between the reference points and the node (system based on ultrasounds usually use a radiofrequency signal to reach this requirement, fact that increases the cost of the system) DTOA (Difference Time Of Arrival): These systems estimate the difference in the distance between known points with respect to a signal generated at the reference points [9]. They usually reach less precision than TOA systems and their computational cost is also higher (they need to intersect hyperboloids [10,11,12,13,14,15]). Their main advantage is that as known points are usually deployed at the same node, synchronization is easier (ultrasound systems do not need any auxiliary signal) making the systems more autonomous.…”

Section: Introductionmentioning

confidence: 99%

HALO4: Horizontal Angle Localization and Orientation System with 4 Receivers and Based on Ultrasounds

Diaz

Martín

Salas

2015

J Intell Robot Syst

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Esta es la versión de autor del artículo publicado en: This is an author produced version of a paper published in: Abstract This paper presents a low cost ultrasonic localization and orientation system based on the DTOA (Differential Time Of Arrival) technique. The proposed system consists in deploying any number of autonomous nodes at the floor of a room and place some transmitters at the ceiling. Each node shall have four ultrasonic receivers to obtain the basic measures for the localization and orientation systems, and the coverage area of the system is defined by any region covered by at least three transmitters. The localization system is based on an estimation process of the horizontal angle of the node with respect to the transmitters. This implementation allows deploying the transmitters at different heights and ignores the error introduced by an incorrect estimation of the ultrasonic signal speed. The computational effort of the proposed system is greater than other ALO (Angle Localization and Orientation) systems, needing a minimization process to obtain the localization results, but it is smaller than in other typical techniques, like those based on the intersection of hyperboloids.

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Section: Introductionmentioning

confidence: 99%

HALO4: Horizontal Angle Localization and Orientation System with 4 Receivers and Based on Ultrasounds

Diaz

Martín

Salas

2015

J Intell Robot Syst

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“…Traditional TDOA systems use the intersections of hyperboloids to obtain the position of the node [9][10][11][12][13][14]. The main disadvantage of these systems is the high computational cost, so they usually implement minimization algorithms.…”

Section: Introductionmentioning

confidence: 99%

ALO4: Angle Localization and Orientation System with Four Receivers

Elvira

Castro

Garrido

2014

International Journal of Advanced Robotic Systems

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This paper presents a 2D indoor localization and orientation system based on a TDOA (Time Difference of Arrival) technique. It uses an array of receivers (four lowcost ultrasonic resonant devices in a square distribution) to implement low-computational-effort DOA (Direction of Arrival) algorithms, based on assumed plane-wave reception. The system only demands two transmitters at well-known positions on the ceiling of the room for obtaining the node position and orientation when it is deployed on the floor of the room. This system has been tested using a Xilinx Spartan-3A FPGA that implements a 52 MHz MicroBlaze. The experimental results include a total of 1,440 points, obtaining a mean localization error of 5.17 cm and a mean orientation error of 3.34º. For this system, the localization and orientation processes are executed in less than 50 us.

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“…of Bristol [10,11], Decca Navigator System [12] or LORAN-C [13]. Their main disadvantage is their high computational cost, so when they are implemented in low cost robots they are usually implemented using linearized equations [14] or with minimization functions [15].…”

Section: Introductionmentioning

confidence: 99%

ALO: An ultrasound system for localization and orientation based on angles

Elvira

Castro

Garrido

2013

Microelectronics Journal

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Esta es la versión de autor del artículo publicado en: This is an author produced version of a paper published in: Abstract:This paper presents a low cost system based on ultrasound transducers to obtain the localization and orientation information of a mobile node, such as a robot, in a 2D indoor space. The system applies a new differential time of arrival (DTOA) technique with reduced computational cost, which is called ALO (Angle Localization and Orientation). Instead of directly calculating its position, the system calculates the direction of arrival of the received ultrasonic signal and, through it, its position and orientation. A prototype of a robot has been built in order to show the validity of the method through experimental results.

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The Decca Navigator system for ship and aircraft use

Cited by 8 publications

References 2 publications

HALO4: Horizontal Angle Localization and Orientation System with 4 Receivers and Based on Ultrasounds

HALO4: Horizontal Angle Localization and Orientation System with 4 Receivers and Based on Ultrasounds

ALO4: Angle Localization and Orientation System with Four Receivers

ALO: An ultrasound system for localization and orientation based on angles

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