Algorithm of Processing the Results of the Bottom Transponders Co-ordination. K. A. Vinogradov, I. V. Dyakov. – Navigation and Hydrography. – 2017. – No. 47. – Р. 7–12.

The results of calculating the bottom transponder co-ordinates by the known and newly developed algorithms are considered. These results were based on the experimental data. It is shown that the proposed algorithm provides a higher accuracy of co-ordinating the bottom transponder and more stable evaluation of the obtained co-ordinates with various geometry of fixing points relative to the bottom transponder.

Key words:        bottom transponder, algorithm, co-ordination, error in measurement, navigation parameters.

Small-size Nuclear-Precession Sensor with Compensation for the Electric Noise. V. A. Blednov, V. V. Blednov. – Navigation and Hydrography. – 2017. – No. 47. – Р. 13–22.

The principle used to create the nuclear-precession sensor able to operate as a modular device both on board a ferromagnetic vessel and in an observatory, is considered. Its protection against the electric noise has been increased several hundred times. The results of tests carried out in the laboratory and aboard the ferromagnetic vessel are presented. This sensor, as an addition to the method of finding the angular components, can be used on board the moving objects in order to measure one of the force components of the magnetic induction vector. The electromagnetic system of the sensor allows to use it for measurement of the magnetic induction vector components.

Key words:        nuclear-precession sensor, manifold compensation for electric noise, laboratory tests, studies on board the ferromagnetic vessel, measurement of the module and components of the magnetic induction vector.

Prospects for Employment of Optical Location Aids to Fix the Position of Autonomous Underwater Vehicle. S. P. Shirshnev. – Navigation and Hydrography. – 2017. – No. 47. – Р. 23–32.

The physics of the optical radiation through the sea water is described. The ways of development of the optical location systems and creation of special-purpose sea bottom charts using them as a basis, are analyzed.

Key words:          underwater vehicles, optical systems, DARPA, optical location aids, electromagnetic waves, light luminous flux, pulse optical range-finders, effect of molecular diffusion.

International Co-operation for Hydrographic Explorations in the Arctic: Theory and Practice. K. G. Stavrov. – Navigation and Hydrography. – 2017. – No. 47. – Р. 33–41.

The principles of organization and implementation of international co-operation in the sphere of study and mastery of the operations in the World ocean, using the hydrographic explorations of the Arctic Ocean by “GNINGI” JSC as an example, are considered.

Key words:        international co-operation, hydrographic explorations.

Quantitative Method of Determining the Sediment Accumulation in the Water Area. A. M. Abramov. – Navigation and Hydrography. – 2017. – No. 47. – Р. 42–46.

The method of quantitative determining the sediment accumulation in the water area is proposed. As the criterion of the sediment accumulation the relationship of calculated distances between the cartographic coastline delineation and the same isobaths from the bottom relief surveys carried out in various time periods, is used. To calculate the distance between them, the Hausdorf metrics is used.

Key words:        sedimentation accumulation in the water area, cartographic delineation of the bottom relief, point marks of depths, isolines, Hausdorf distance (metrics).

Method of Clusterisation of the Vertical Sound Velocity in the Ocean. Y. N. Zhukov. – Navigation and Hydrography. – 2017. – No. 47. – Р. 47–54.

The method of clusterisation of the sound velocity in the ocean is described. The method allows to carry out the automated clusterisation of the arrays of the vertical sound velocity distribution and to obtain the representative curves of the vertical sound distribution for the chosen classes.

Key words:          clusterisation, vertical sound velocity distribution.

On Possible Ways to Improve the Means and Methods of Exploration of the Water Area Using the Results of the Patent Information. V. P. Lenkov, A. B. Fedorov, V. V. Chernyavets. – Navigation and Hydrography. – 2017. – No. 47. – Р. 54–59.

The patents of the “GNINGI” JSC employees in the sphere of improvement of the means and methods used to explore the water areas are analysed. Using them as a basis, the directions of development for the technical means and methods are determined. The role of the patent information in revealing the innovation solutions in these directions is pointed out.

Key words:        innovation solution, means and methods of exploration of the water areas, directions of development, patent information.

Modern Space-Time Trend Changes in Global Air Temperature of the Northern Hemisphere. T. N. Zadorozhnaya, V. P. Zakusilov. – Navigation and Hydrography. – 2017. – No. 47. – Р. 60–66.

This paper investigates the tendencies of air temperature changes that have occurred over recent decades in the Northern hemisphere as a whole, separately for latitudes, longitudes, heights and months of the year.

Key words:        change of climate, air temperature, atmospheric properties.

Probabilistic Model of Special-Purpose System of Hydrometeorologic Support. A. A. Borisov, Y. V. Kuleshov, A. B. Makov. – Navigation and Hydrography. – 2017. – No. 47. – Р. 67–73.

The mathematical model of performance indicator of operation for the special purpose hydrometeorologic support systems has been developed. The model takes its structure composition and functions into account.

Key words:        hydrometeorologic support, mathematical model, performance indicator.

Method of Compressed Measurements to Provide the Hydrometeorologic Support for the Navy. Y. N. Zhukov. – Navigation and Hydrography. – 2017. – No. 47. – Р. 73–84.

The short description of the new method, the method of compressive sensing, using the measurement of hydrometeorologic processes as an example, is presented. The method allows to describe the changeability of hydrometeorologic processes in random samples.

Key words:        method of compressed measurements, hydrometeorologic measurements.

Increasing the Reliability of Reseption of an Echo Signal at Determination of Height of the Lower Bound of Clouds. A. V. Dеmin, E. A. Seledkina. – Navigation and Hydrography. – 2017. – No. 47. – Р. 85–92.

In this paper methods for determining the height of the cloud bottom are analyzed, an algorithm for processing echoes is proposed, which reduces the number of emitted pulses, thereby improving the quality of the output data.

Key words:        measuring instrument of height of the lower boundary of clouds, echo signal, complexing method.