Algorithms optimizing the trajectory of dynamically controlled object based on integral and local criteria are synthesized. Observability measure is proposed as a decision optimization rule. It is shown that optimal trajectory control improves the accuracy of navigation solutions by INS/GNSS navigation system data using automatic dependent surveillance.

The paper describes the sources of fundamental noises in FOG measurement signal. Methods of excess relative intensity noise (RIN) compensation are considered. Technique improving the compensation method using division of signals from two photodetectors for noise suppression is proposed and implemented. Functional simulation is conducted, which estimates the limiting theoretical value of noise suppression by the selected compensation method with the photodetector power of min 10 μW. Test results for FOG experimental prototype are presented. Allan variance plots for the cases with and without compensation are constructed.

The possibility of minimizing the temperature gradients in fiber-optic gyroscopes as part of strapdown inertial navigation system through the use of nano-structured composite materials based on carbon nanotubes having a high thermal conductivity is discussed in this paper.

A correction filter for mechanically dithered single-axis ring laser gyros (RLG) is proposed. The filter is intended to determine the angular position of a strapdown inertial navigation system (SINS) in the RLG sensitivity axis using the known value of the RLG angular position with respect to inertial space, taking into account the models of the suspension elastic forces nonlinearity, the hysteresis model of oscillation energy dissipation, and the model of the suspension piezoceramic drive. Parameterized models of nonlinearity, dissipation, and the output characteristic of the suspension piezoceramic drive have been developed. A method for finding nonlinearity parameters of elastic forces using a set of experimental amplitude-frequency characteristics (AFC) is proposed. Numerical simulation of the AFCs of the notch elliptic and correction filters under sinusoidal rotation of the SINS with the amplitude of 1 arcmin in the frequency band of 80–3600 Hz has been performed. The efficiency of the proposed filter has been verified experimentally under pulse action on SINS; the test results are discussed. Comparison of the experimental and calculated data shows the adequacy of the proposed models and satisfactory operation of the correction digital filter.

The influence of vibrations, shocks and acoustic noise on characteristics of MEMS gyro is studied. Comparison of characteristics of the gyros with different resonance frequencies (3 and 8 kHz) of the inertia body suspension has revealed the advantage of the sensor with higher resonance frequency. The test results for two modifications of RR-type MEMS gyro, developed in CSRI Elektropribor, are presented.

Phase center offset (PCO) of GPS antenna has a considerable influence on the precision and accuracy of the resulting coordinates. As joint observation mode of various GPS receivers and antennas becomes increasingly universal, efficient determination of PCO values of multi-type dual-frequency GPS receiver antennas at the same time needs to be addressed urgently. According to the property of antenna PCO, a relative positioning calibration method, which is based on GPS relative positioning survey theory, is proposed. This method only needs two steps, each being a simultaneous observation of one consecutive sidereal day for the reference antenna and the calibrated antenna. Experimental results for several widely used GPS antennas show that this method greatly improves the calibration efficiency and can estimate horizontal PCOs for both frequencies. The proposed method can be fully applied to synchronously assess PCOs of multi-type dual-frequency GPS. antennas in high precision position.

In order to increase the accuracy of Fourier synthesis for surface harmonics, used in description of the Earth gravity field, the regulating properties of stabilizing multipliers are studied. The efficiency of methods under test is estimated using the nonregularized model of the global gravity field ITSG-Grace2014S, presented on the ICGEM web-site [8].

Proposals aimed at structure improvement of the Russian geodetic network are discussed in the article. The network is considered as a physical representation of terrestrial reference frame and as an important element of the Integrated System for Positioning, Navigation and Timing.

Application of modern global geopotential models to estimate the navigation quality of the Earth’s anomalous gravity field (EAGF) is considered from the viewpoint of its use in autonomous (correlation-extreme) navigation. Various algorithms for calculating route and area navigation quality characteristics, for which the authors used the variance and correlation radius of a measured EAGF parameter, are presented. The results of the experimental studies on estimation of the EAGF navigation quality are discussed by analyzing vertical deflections and second derivatives of the perturbing potential in the Sea of Okhotsk with the use of the model EGM-2008 to degree 2190. It is shown that second derivatives of the geopotential demonstrate a higher quality as applied to navigation purposes.

The paper reports the experimental research and provides the obtained quantitative and qualitative dependencies of underwater acoustic (UWA) modem performance, particularly, delivery success of navigation data packages, on the main characteris-tics of hydroacoustic communication channel. Experiments were carried out at the sea shelf near the island of Palmaria (Italy, Mediterranean) during CommsNet13 marine expedition organized by the Center for Maritime Research and Experimen-tation (CMRE, La Spezia) using UWA S2C modems by Evologics, Germany.