Developments of Interface for VHF, MF/HF Communication Using DSC in GMDSS Services in the Framework of E-navigation Concept

It is proposed the description of interface for VHF/MF/HF for simplification of DSC communication for implementation in the frame of conception developments in GMDSS services, applied to Maritime Mobile Services. This interface is realized within its integration with INS by an appropriate way on the base of common communication protocol for all three DSC communication sub bands in standardized and harmonized format and significantly simplifies the DSC user interface. It is very important for application in Maritime services, including GMDSS services, VTS services and SAR service. Suggested approach for improving DSC communication is based on the three main outputs of e-navigation strategic direction development related to the integration of communication and navigation equipment/systems, including standardized mode of operation. Implementation of the standardization demands to include in this integration the satellite AIS system. The feasibility of the proposal is supported by the existence of relevant IEC standards and IMO documents

Antenna for marine radar with supperdirectivity properties

The reception antenna diagram side lobe’s level suppression algorithm for marine radar by means of antenna array with only a few tuning elements of antenna array is considered. The others no tuning elements of array are choosing for obtain a given value of average side lobe level suppression and with given value of antenna directivity without using of numerical optimization procedures. Special algorithm of interaction of these no tuning elements for realizing Supperdirectivity properties is used. The structural diagram of array is presented. The efficiency of suggested design has been investigated

Modified algorithm for antenna pattern side lobe level suppression with minimum quantity of controllable elements

The algorithm of linear antennas array radiation pattern formation for shipboard radar is proposed, which, at the cost of tuning two antenna array elements only, provides practically full suppression of side lobes of the array radiation pattern (RP) at any azimuth angle beyond the main lobe area. This gives the possibility of separated surveillance of signals from vessels with large and small target cross sections, at equal ranges and close azimuth angels. The results of the RP calculations for different scenarios are given. The possibility of twinning points of suppression at the expense of symmetric RPs is shown

Radiation pattern of linear antenna array with control of directivity and supper-selectivity properties

Improved linear antenna array design capable of obtain the given side-lobe suppression with controlled value of antenna directivity is suggested. The antenna of supper selectivity properties is also suggested. A clear linear antenna design procedure has been presented that does not require the implementation of numerical optimization procedures. The efficiency of suggested design has been investigated

GPS Synchronization of Audio Watermarks in the Maritime Automatically Identified Radiotelephony

Audio watermarking (AW) technology in cooperation with GPS synchronization of watermarked frames is proposed for application in the maritime VHF communication for automatic identification of radiotelephone messages. Automatic identification ensures efficient messaging from the very beginning of a radio transmission, while eliminating the human factor inherent in voice identification. AW refers to inaudible embedding of additional data just into the post microphone signal, using standard marine installations without any additional radio channel resources. The designed algorithm is based on data embedding in the Fast Fourier Transform domain with the rate of 32 bit/s. The experimental prototype of the device is designed on the base of micro-controller development kit 32F429IDISCOVERY and GPS module NEO-6M-0-001. Designed system, applied for automatic ship’s identification, provides the full compatibility with the existing radio installation, and does not require replacement of standard VHF transceivers and operational procedures. Besides automatic identification the system may be used in the special applications, for example, by the threat of terrorist attack; generally contributes to navigation safety and information security

SMART digital selective calling user interface on the base of Integration maritime navigation and radiocommunication equipment

High level solution S4 of the IMO E-navigation Strategy Implementation Plan provides integration and presentation of available information in graphical displays received via communication equipment. At the same time, the problem of the correct application of digital selective calling (DSC) operational procedures in navigation practice has existed since the introduction of the GMDSS and requires a solution. This problem may be resolved on the base of integration maritime navigation and radiocommunication equipment. The article proposes approach for practical realization of this integration by implementing a SMART (specific, measurable, assignable, realistic, and timely) DSC interface within S4. Using this approach the practical realisation integration of AIS – DSC – Information display was implemented. It makes possible implementation of user-friendly human-machine interface (HMI) for navigator. An experimental prototype of communication graphical interface is designed, which allows effective decision-making on radio communication control/monitoring. The use IEC 61162-1/2 (Maritime navigation and radiocommunication equipment – Digital interfaces) data transfer provides standard inter-module connections and eliminates the negative impact of the equipment diversity from different manufacturers by means uniform HMI implementation