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Sensors 2017, 17(5), 1183; doi:10.3390/s17051183

Pseudorange Measurement Method Based on AIS Signals

1
Information Science and Technology College, Dalian Maritime University, Dalian 116026, China
2
School of Information Science and Engineering, Dalian Polytechnic University, Dalian 116034, China
*
Author to whom correspondence should be addressed.
Academic Editor: Assefa M. Melesse
Received: 9 February 2017 / Revised: 5 May 2017 / Accepted: 18 May 2017 / Published: 22 May 2017
(This article belongs to the Section Remote Sensors)
View Full-Text   |   Download PDF [4950 KB, uploaded 22 May 2017]   |  

Abstract

In order to use the existing automatic identification system (AIS) to provide additional navigation and positioning services, a complete pseudorange measurements solution is presented in this paper. Through the mathematical analysis of the AIS signal, the bit-0-phases in the digital sequences were determined as the timestamps. Monte Carlo simulation was carried out to compare the accuracy of the zero-crossing and differential peak, which are two timestamp detection methods in the additive white Gaussian noise (AWGN) channel. Considering the low-speed and low-dynamic motion characteristics of ships, an optimal estimation method based on the minimum mean square error is proposed to improve detection accuracy. Furthermore, the α difference filter algorithm was used to achieve the fusion of the optimal estimation results of the two detection methods. The results show that the algorithm can greatly improve the accuracy of pseudorange estimation under low signal-to-noise ratio (SNR) conditions. In order to verify the effectiveness of the scheme, prototypes containing the measurement scheme were developed and field tests in Xinghai Bay of Dalian (China) were performed. The test results show that the pseudorange measurement accuracy was better than 28 m (σ) without any modification of the existing AIS system. View Full-Text
Keywords: pseudorange measurement; Gaussian baseband; timestamp detection; optimal estimation; AIS-R mode pseudorange measurement; Gaussian baseband; timestamp detection; optimal estimation; AIS-R mode
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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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Zhang, J.; Zhang, S.; Wang, J. Pseudorange Measurement Method Based on AIS Signals. Sensors 2017, 17, 1183.

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