Navigation and Hydrography # 53/2018

1. A Method for Increasing the Resolution of Shipborne Radar Based on a Signal With a Linear Frequency Modulation and a Split Spectrum. V. S. Bakholdin. – Navigation and hydrography. – 2018. – No. 53. – P. 7–13.

A method of generating signals with linear frequency modulation for shipborne radar based on the splitting of the signal spectrum is proposed. Mathematical modeling of the proposed signal is carried out. The spectral and correlation characteristics of the new signals are compared with the characteristics of the meander noise-like signals. The estimation of the potential resolution of signals with linear frequency modulation and split spectrum is given.

Key words:  Pulsed radar signal, linear frequency modulation, resolution, split spectrum.

2. Ships Route Planning with Respect of Sea Waves Danger. V. M. Grinyak, A. S. Devyatisilny, D. A. Akmaikin. – Navigation and hydrography. – 2018. – No. 53. – P. 14–23.

The problem of marine traffic safety is discussed in this paper. The problem of ships path planning taking into account heavy weather conditions (sea waves) along the route is considered. As a metric characterizing the safety of traffic, a well-known storm diagram of ships at a passing wave is used. According to it, the level of danger is determined from the data on height and wavelength. As a source of meteorological data, satellite monitoring information is used. It is shown that in spite of the roughness of the initial data, they are able to give a practical solution for choosing the trajectory of the vessel's motion. The work is accompanied by the results of full-scale experiments. The results of the assessment of the vessels safety and path planning in the waters of the North Pacific are presented.

Key words:  marine safety, sea waves, path planning, storm diagram, shortest path.

3. The History of the Development of Navigational and Hydrographic Support (NHS) in the Water Area of the Northern Sea Route. Part I. Creation and Development of the NHS System in the Arctic Seas of Russia in the Period of the 1930s - 1980s. S.V. Reshetnyak. – Navigation and hydrography. – 2018. – No. 53. – P. 24–33.

The article is dedicated to the 85th anniversary of the creation in 1933 of the Hydrographic Department of the Main Directorate of the Northern Sea Route under the Council of People's Commissars of the USSR. Part I of the article considers the water area of the Northern Sea Route as an object of the NHS; the main features affecting the organization of the NHS in the Arctic seas of Russia, and the three stages of the development of the NHS system in the Arctic seas of Russia from 1932 to 1990.

Key words:  Northern Sea Route, navigational and hydrographic support, navigation safety, Arctic.

4. A Method of Photogrammetric Determination of the Coordinates of Terrain Points in an Inaccessible Area. Yu. P. Nechypas, Yu. V. Levadny, V. A. Telesh. – Navigation and hydrography. – 2018. – No. 53. – P. 34–39.

The article proposes a method for determining the coordinates of terrain points in a photogrammetric manner, which is suitable for determining the angle elements of orientation of photo images with any values of tilt 

Key words:  photogrammetric method, field preparation of images, photogrammetric processing, exterior orientation elements.

5. The Nature of Sea Level Fluctuations with Periods more than Tidal. Yu. N. Zhukov, E. V. Fedorovа. – Navigation and hydrography. – 2018. – No. 53. – P. 40–49.

The analysis of the statistical properties of low-frequency (with periods of less tidal) sea level fluctuations according to field measurements in the Arctic basin. The range of low-frequency fluctuations is comparable with the amplitude of the tide. It is shown that low-frequency fluctuations are non-stationary, not limited in scope processes. The distribution of the heights of such oscillations is asymmetrical and has heavy “tails”.

Keywords:   sea level, low-frequency fluctuations, heavy "tails"

6. Assessment of the Currents Stability in the North-Western Part of the Pacific Ocean. S. I. Mastryukov, N. V. Chervyakova – Navigation and hydrography. – 2018. – No. 53. – P. 50–57.

The article presents an approach to the calculation of climatic indicators of currents, taking into account their sustainability. The initial data used are numerical modeling of currents in the north-western part of  the Pacific Ocean, produced by the European System of Operational Oceanology Copernicus. Seasonal and spatial variability of the indicator of stability of currents is revealed. Formulated proposals for the calculation and construction of maps of climatic indicators of currents, taking into account their sustainability.

Keywords:   current stability, operational oceanology, grid arrays, information support for marine activities.

7. The New Method for Assessing the Degree of Deep Pollution of Sea Waters. Sima A. G. Askerova – Navigation and hydrography. – 2018. – No. 53. – P. 58–64.

The article is devoted to the assessment of the deep pollution of sea waters. The possibility of developing a criterion for the average estimate of the degree of total pollution of marine waters is investigated. With reference to two polluting components of sea waters, characterized by the paraphase dependence of their concentration on a common parameter — depth, a depth-integrated indicator of deep pollution of sea waters is proposed. It was determined that the latter does not possess extreme properties and can be used as an objective indicator of the degree of pollution of sea waters.

Key words:  pollution, sea water, weighted assessment, heavy metals, oil hydrocarbons.

8. On the Issue of Creating a System of Operational Oceanology for the Navy Hydrometeorological Support. A. M. Sharkov, N. N. Zhiltsov – Navigation and hydrography. – 2018. – No. 53. – P. 65–71.

The article considers some aspects of creation of the system of operational oceanology.

Keywords:   operational oceanology, hydroacoustics, observational subsystem, glider, robotics, data collection.

9. Method of the Automated Zoning of Vertical Sound Speed Distribution in the Ocean. Yu. N. Zhukov, V. Yu. Bakhmutov – Navigation and hydrography. – 2018. – No. 53. – P. 72–82.

The article describes the method of automated zoning of the vertical  sound speed distribution (VSSD) in the ocean based on hierarchical clustering. A distinctive feature of the method is the integral consideration of the similarity of the forms of the VSSD curves and the proximity of the VSSD measurement points. Algorithm for visualization of representative VSSD and their respective areas allows it to be included in the WMS technology software environment for coordination with the scale of the map.

Keywords:   vertical distribution of sound speed, zoning, hierarchical clustering.

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