Vol 60, No 10 (2018)

The block diagram, technical characteristics, and results of studies of GET 167–2017, the State Primary Standard of the unit of power of electromagnetic oscillations in the frequency range from 37.5 to 78.33 GHz, are presented.

A method of prediction based on linear extrapolation with the use of the mathematical expectation of the rate of variation of the values of a controlled parameter as the slope of an extrapolating line is presented. A method constructed with the use of a correction of a linear function is considered. Correction is performed with the use in the method of least squares of variable weight coefficients that regulate the influence of the interpolation nodes on the final result as a function of the distance of these nodes from the current values of the argument of the extrapolating function.

A regular procedure for the construction of a linear algebraic code for the detection of errors in the storage devices of information-measurement systems is proposed. Implementation of the new code assures a high level of functional reliability of the devices while reducing information and hardware redundancy. Mathematical expressions for estimating the parameters of the code are obtained.

Features and errors of an inertial navigation system and a satellite-based navigation system are investigated. Algorithmic methods of correction of an inertial navigation system with the use of information from the satellite navigation system are considered. The use of a predictive trend modified by a self-organization algorithm is proposed for correction of an inertial navigation system in off-line mode.

The metrological characteristics of an automated interferometric system for measuring the surface shape of diffusely reflecting objects have been experimentally studied. Changes in the amplitude of the output signal during modulation of the optical path difference were studied and visualization of the effect of introduced interference on the measurement error was made. It is established that as the angle of incidence of optical radiation increases, the duration of the interference signal increases and, correspondingly, the measurement error of the automated interferometric system. The dependence of the measurement range on the scanning frequency of the reference mirror is obtained. The measurement error of an automated interferometric system under normal illumination does not exceed 0.67 μm.

A contactless method is presented for measuring the surface temperature of radioelectronics objects from their own infrared radiation. Metrological analysis of the contactless method was executed using the small perturbations method.

A comparative analysis of the potential precision of measurements of the angular coordinate of a radar target in discrete and linear scanning of an antenna beam is performed. A formula for determining the variance of an estimate of the angular coordinate based on the likelihood function for two positions of the antenna beam and the Kramer–Rao expression is obtained. An approximation of the form of the antenna directional pattern is proposed. Based on the results of the calculations, it is established that the precision of a measurement of the angular coordinate is higher in discrete scanning than in linear scanning.

We examine new ideas for metrological support for stability measurements of laser beam position based on the provisions of GOST R ISO 11670-2010.

A technique for measuring the index of nonlinearity of a probing signal is proposed, and an ultrasonic device to implement this technique is described. The high sensitivity of the measured index to metal damage is shown. The characteristics of the device make it possible to use it as a means of nondestructive testing of metal in production conditions at industrial facilities.

The acknowledgement on page 944 should read This work was supported by the Ministry of Education and Science of the Russian Federation under the agreement of 14.577.21.0279 of 26.09.2017, identifi er RFMEFI57717X0279.

Methodological errors of defining the thermophysical characteristics of construction materials have been evaluated. Methodological errors are caused by heat exchange of a sample with the environment in conditions corresponding to execution of the laser pulse method at high temperatures. Analysis was done of the effect on methodological errors of heat exchange (as a result of natural convection) with the environment. It has been shown that the laser pulse method can be used to determine thermal diffusivity and thermal capacity of highly heat-conductive wire materials (metals and alloys) at temperatures to 1173 K.

The measuring area of a magnetic dipole moment transducer was analyzed. The transducer was constructed based on coaxial receiver loop antennas. Transformation functions were found for a point source of an alternating magnetic field, depending on the disposition of the source in the measuring area. The optimum ratio of the geometrical sizes of the transducer for obtaining the minimum non-uniformity of measuring area was defined.

Adsorption-induced deformation of microporous carbon adsorbents AUK and AR-V with different genesis was measured in conditions of methane adsorption (temperature 273, 313, 353, 393 K; pressure 0–6 MPa). Thermal deformation of carbon adsorbents AUK and AR-V was measured in the temperature range of 273–573 K. Coefficients of linear thermal expansion (CTE) of carbon adsorbents were calculated in the temperature range of 273–573 K: for AUK, a_T = (3 ± 0.15)·10^–6 K^–1; for AR-V, _T = (8.4 ± 0.6)·10^–5 K^–1. A comparative analysis of the CTE of adsorbents and crystal graphite was implemented.

The results of international comparisons in the field of fiber-optic communication and information transmission systems, in particular, for the average power of optical radiation (COOMET PR-S6 and APMP PR-S2 projects) and chromatic dispersion in an optical fiber (EURAMET PR-S3 project), are considered. Data on comparisons as regards the length of the optical fiber (APMP PR-S8), polarization mode dispersion (COOMET PR-S9 project), and wavelength for fiber optics (COOMET PR-S8 project), all of which are now being performed, are presented.