Abstract
In order to remedy the inadequacy of the sources of differential corrections in current automatic identification system (AIS) and to improve the positioning accuracy of AIS mobile stations using single-point positioning, a differential correction approach for AIS mobile stations based on the continuously operating reference station (CORS) network is proposed. In the approach, AIS server derives real-time pseudo-range differential corrections from each reference station in CORS network and generates the corrections for AIS mobile stations. Then AIS base stations transmit these differential corrections to mobile stations using broadcast or addressed binary messages for positioning. Load analysis and testing show that this approach can effectively meet the need for differential corrections for most AIS mobile stations under the condition that the occupancy rate of the AIS channel is less than 1% when using broadcast binary messages. In addition, since this method is based on the existing CORS network, it is straightforward to implement in engineering projects and does not require additional hardware upgrades to the existing differential global positioning system (DGPS) and AIS infrastructure.
Highlights
The automatic identification system (AIS) is a novel type of navigational aid composed of shore-based facilities and shipborne equipment [1]
The green dots indicate the positioning result with the aid of the differential correction approach using broadcast binary messages
By analyzing the positioning results, we found that the accuracy of static positioning and dynamic positioning corrected by our approach (1.06 m (2DRMS) and 2.54 m (2DRMS), respectively) was better than the accuracy of the AIS single-point positioning system (2.15 m (2DRMS) and
Summary
The automatic identification system (AIS) is a novel type of navigational aid composed of shore-based facilities and shipborne equipment [1]. An AIS mobile station is a shipborne device that can provide information, such as unique identification, position, course, and speed to other vessels’. Reliability of the AIS system is closely related to the positioning precision of AIS mobile stations. The higher the positioning accuracy input to the AIS system, the safer navigation of the ship will be. Some of the AIS mobile stations do not have the DGPS module and the single-point positioning accuracy of these mobile stations is only around 10 m which cannot meet the needs for ships when in crowded waters. Scholars are increasingly concerned about how to improve the positioning accuracy of the AIS system [2]
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