Abstract
This paper investigates the Additional Secondary Phase Factor (ASF) characteristics of Automatic Identification System (AIS) signals spreading over a rough sea surface. According to the change of the ASFs for AIS signals in different signal form, the influences of the different propagation conditions on the ASFs are analyzed. The expression, numerical calculation, and simulation analysis of the ASFs of AIS signal are performed in the rough sea surface. The results contribute to the high-accuracy propagation delay measurement of AIS signals spreading over the rough sea surface as, well as providing a reference for reliable communication link design in marine engineering for Very High Frequency (VHF) signals.
Highlights
With the rocketing development of the world maritime adventure and the rapid progress of shipbuilding technology, all countries in the world are paying more and more attention to life at sea and navigation safety [1]
The seawater temperature has a slight effect on the additional secondary phase factor (ASF) of the Automatic Identification System (AIS) reflected signal
The ASFs of the AIS diffracted signal show a trajectory of decrease first, increase decrease again and increase with the increase of the clearance parameters
Summary
With the rocketing development of the world maritime adventure and the rapid progress of shipbuilding technology, all countries in the world are paying more and more attention to life at sea and navigation safety [1]. The International Maritime Organization (IMO) has set out a list of technologies that must be met by an electronic positioning system during the various voyage phases [2], which sets higher technical requirements for shipborne navigation equipment. Shipborne AIS equipment is mandatorily installed according to the IMO and major coastal states, and regions in the world have established comparatively perfect. Once GNSS fails, the shipborne navigation equipment will not receive correct maritime navigation information, which presents a serious threat to navigational safety [9]. The IMO has explicitly stated that all ships should mandatorily install space-based and land-based backup systems [10,11,12]. AIS is an alternative future land-space navigation system [9], which could provide PNT information without depending on other navigational sensors [3].
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