VHF Radio Subsystem

VHF coastal base stations are installed in the first phase, which together with their associated antennas are located in the towns of Florentin, Lom, Oryahovo, Somovit, Svishtov, Ruse, Tutrakan and Silistra. Every one of them has three VHF radios, which are connected to the network environment and can be controlled remotely by the RIS center.

With the completion of the second phase of the project, the above sites are equipped with additional 3 VHF base stations. The aim is to increase readiness, reliability, quality of service and system flexibility in terms of planning and preventive repairs by introducing redundancy. Also increase convenience for RIS operators using systemic in order to efficiently and easily manage, without loss of time and efficient provision of information for their work. Homogeneity is achieved and integrity of ​VHF with other subsystems - all the hardware and software are available and easily usable from the same place where RIS operator works with the remaining equipment. Moreover software uses information from VHF AIS base stations, if available, to know where the ship, which correspondence and it is depicted in the VHF operator's workplace. By booking of equipment and shore-based regular and permanent maintenance of own engineering and administrative staff, who has undergone special training is achieved increasing the readiness and reliability.

VHF Radio subsystem provides continuous connectivity between RIS operators and vessels and record all voice communication, monitors software and hardware components and complete radio coverage of the Bulgarian section of the Danube. Radiotelephone subsystem met all the requirements of RAINWAT Agreement of 18 April 2012. Signed by the Republic of Bulgaria, as well as recent changes in it to function in accordance with the latest version of the document ETSI EN 300 698 systems ATIS.
RIS system in the center of Ruse consists of managing and controlling part, operator consoles with the possibility of reproduction, transmission and processing of audio server for audio recording, which records all received ATIS codes and uniquely related audio and administrator station. All equipment is duplicated in Book RIS center in Varna. In remote sites are located VHF base station interface module for VoIP, as well as the necessary controllers, antennas and filters. All systems are synchronized.
All connections between Operational RIS center of Ruse and Varna back up RIS center and outlying points are implemented via TCP / IP interface. Transmission between distant points is carried out via radio links.

The VHF radio subsystem provides the following options:

* selection of a carrier channel, a base station and a radiotelephone;
* selection of a group of channels to broadcast a message;
* broadcasting a previously recorded message by means of setting channels and base stations;
* real-time data acquisition about ATIS, the code of the ship, which communication is carried on with;
* recording of all communications and messages in a database;
* retrieving information from the database
* The system provides an interface for connecting the radio channels to the public telephone network and telephone connection channels to radio channels.

In essence, the system provides service users to connect from the telephone / mobile phone to the ship and back, in the Bulgarian section of the Danube.
 1. After dialing the number +359 82 29 84 60 (RIS Center Ruse) RIS operator connects the phone call to a predefined VHF channel to realize a conversation with the crew of a ship, regardless of its location in the Bulgarian waters of the river.
   2. Upon request by the crew a conversation might be realized from VHF radio to a requested phone number. All calls are recorded.

The above service is performed only in case of emergency.

Radio pokritie

Fig.1 BULRIS VHF radio subsystem coverage 

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