CONTENTS

I. ACOUSTICS
A.E. Isaev, A.M. Polikarpov
Measurement the speed of sound in aquatic environment by the phase-pulse method with variable base ……. pages 8–20
A.A. Karabutov, N.P. Muravskaya, A.V. Strel’tcov, F.I. Khrapov
The possibility of precise measurement of the group velocity of ultrasonic waves of submicrometer-sized objects using laser excitation of acoustic pulses ……. pages 21–29
E.A. Lavrov
Experimental study of the characteristics of the acousto-optic modulator AOM 25-12 ……. pages 30–36

II. NAVIGATION INSTRUMENTS
A.I. Bolkunov, I.V. Mozharov, A.M. Kaverin, I.S. Silvestrov
Main results of United Nations International Committee on GNSS’ Trial Project on international monitoring and validation of the characteristics of Global Navigation Satellite Systems ……. pages 37–49

III. INSTRUMENTS AND METHODS OF MEASUREMENT (BY TYPE OF MEASUREMENT)
K.A. Zagorul’ko, A.V. Kozlov, N.P. Khatyrev
Numerical simulation of RIN measurements of single-frequency lasers by optical heterodyning ……. pages 50–55
A.E. Kadyrov, E.V. Ivanchenko, D.S. Kupalov, V.N. Baryshev
Modernization of the laser-optical system of the cesium atomic fountain frequency standard ……. pages 56–62
V.I. Vasiliev, S.A. Boim
Efficiency of the mobile hydrogen frequency standard platform damping ……. pages 63–71

IV. METHODS AND INSTRUMENTS FOR MONITORING AND DIAGNOSTICS OF MATERIALS, PRODUCTS, SUBSTANCES AND THE NATURAL ENVIRONMENT
M.D. Kraynova, V.I. Lyalin, O.I. Kovalenko
Investigation of physico-chemical properties of improved volumetric measures of radionuclide activity ……. pages 72–77
A.V. Fedin, D.S. Potekhin, O.V. Martynov, A.S. Karpenkov
Underwater optical vision system for operation in harsh ……. pages 78–87
Filimonov E.V.
Problems of metrological support for measurements of dissolved carbon dioxide concentration in water ……. pages 88–97

V. Metrology and metrological support
A.S. Doynikov, P.V. Kosyrev
Ensuring the traceability of measurements during accreditation in the national accreditation system taking into account navigation measurements ……. pages 98–106
D.I. Ziuzin
Issues of ensuring the quality of training of specialists in the field of metrology ……. pages 107–113

VI. ANTENNAS, MICROWAVE DEVICES AND THEIR TECHNOLOGIES
M.S. Shkurkin, D.V. Logutov, I.M. Malay, F.I. Khrapov
EMC antenna calibration methods ……. pages 114–135
V.Y. Kaspin, A.S. Zavgorodniy
Processing of a navigation signal received with a directional antenna system ……. pages 136–141
A.I. Matveev, A.V. Pivak, I.P. Chirkov
Waveguide calibration kits: composition and specification ……. pages 142–159
D.V. Logutov
Antenna factor measurement results of EMC antenna based on standard site method ……. pages 160–168