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Sensors 2016, 16(8), 1284; doi:10.3390/s16081284

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

1
Department of Computer Engineering, Ajou University, 206 World cup-ro, Yeongtong-gu, Suwon 16499, Korea
2
Department of Military Digital Convergence, Ajou University, 206 World cup-ro, Yeongtong-gu, Suwon 16499, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Assefa M. Melesse
Received: 27 April 2016 / Revised: 9 August 2016 / Accepted: 10 August 2016 / Published: 12 August 2016
(This article belongs to the Section Remote Sensors)
View Full-Text   |   Download PDF [3721 KB, uploaded 12 August 2016]   |  

Abstract

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. View Full-Text
Keywords: accuracy enhancement; re-estimation; positioning algorithm; virtual measurement; dilution of precision accuracy enhancement; re-estimation; positioning algorithm; virtual measurement; dilution of precision
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lee, K.; Baek, H.; Lim, J. Enhanced Positioning Algorithm of ARPS for Improving Accuracy and Expanding Service Coverage. Sensors 2016, 16, 1284.

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