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The article deals with the possibility of creating an algorithm for a complimentary inertial navigation system based on micromechanical sensors with the correction from the global navigation satellite system and the speed sensor (odometer). Instead of the traditional solution based on the Kalman filtering, the article proposes an alternative algorithm to correct SINS's errors. The article presents...
The paper is devoted to the analysis of the accuracy of measuring the distance between underwater vehicles using underwater acoustic modems in natural conditions and aimed to increasing the performance of autonomous underwater vehicles (AUV) onboard navigation systems. The results of the experimental research conducted as sea under-ice trials are presented. The positions of the underwater acoustic...
The work aims to present the results of the application of previously developed calibration technique that allows conducting calibration experiments at changing temperature with simultaneous estimation of temperature variation coefficients, to an inertial measurement unit of navigation grade, namely BINS-RT of JSC “Inertial Technologies of Technocomplex”. The whole dataset obtained from the inertial...
Special features of implementing the modes of operation of strapdown inertial navigation system (SINS) under sea application conditions are considered. The above-mentioned SINS based on laser gyros has been the object of our studies. Approaches to the raising of the accuracy characteristics of such SINS are proposed, which are based on the use of geophysical invariants and on the integrated processing...
Advanced technologies of air traffic management suggest changing-over to free routing (procedures for dynamic change in the flight route) in order to improve the efficiency of aviation transport. These technologies are based on the Performance-based Navigation (PBN) concept and the use of satellite navigation systems. However, the accuracy of such systems depends on the position of navigation satellites...
The discrete stationary linear filtering problem with unknown covariance matrices of generating (system) and measurement noise is considered. An adaptive algorithm for calculating the optimal, in the root-mean square sense, estimate and an algorithm for calculating the Cramer-Rao Lower Bound (CRLB) are proposed to analyze the efficiency of suboptimal algorithms that do not require significant computational...
The algorithm for coordinate location by matching a scene photo with the locality map has been developed. Stages and test results on real and synthetic models are given.
The prospects for using autonomous underwater robots in solving marine gravimetry problems are considered. It is shown that the autonomous underwater robot is a good platform that provides new advanced features for precision measurements and mapping of local gravitational fields and their anomalies. The paper provides experimental data that allow us to estimate the accuracy of the measurements taking...
We consider problems of synthesis of the vector spline guidance laws and digital attitude control of a maneuvering land-survey satellite. We have presented the results on the efficiency of the developed algorithms.
The paper presents an automated zenith telescope developed by Concern CSRI Elektropribor. The telescope is intended to determine the components of vertical deflection by the observation of circumzenithal part of the stellar sky in field conditions. The telescope design principle, main parameters of its components, and observation processing algorithms are considered. Test results for a telescope prototype...
We present the discrete algorithms for filtering measurements, in-flight calibration and alignment of an astroinertial system for attitude and angular rate determination of a maneuvering land-survey satellite.
The paper describes the development of the monitoring system guidance program on the Venus orbit. The monitoring system consists of six spacecraft with solar sail. Motion simulation of the solar sail spacecraft monitoring system is based on the guidance program, which consists of mathematical motion model and control laws of Keplerian element changes. The findings of the work include a flight trajectory...
A definition of a Global geodetic observing space system design and space geodetic techniques are described. It is proposed that the Global geodetic observing space system shall consist of 1–2 MEO (Medium Earth Orbit) spacecraft(s), a LEO (Low Earth Orbit) spacecraft featuring on-board gravity gradiometer and/or 2 LEO spacecrafts featuring high-precision satellite-to-satellite tracking (SST) instruments,...
According to the statistics of launches of spacecrafts of nanoclass (nanosatellites), CubeSat is the most popular format of nanosatellites. Nanosatellites of this format are widely used for the solution of different problems of scientific and application-oriented assignment. For the correct interpretation of results of the experiments made on nanosatellites it is necessary to know the full vector...
Increasing the length and diameter of the fiber ring of fiber optic gyroscope (FOG) can improve the accuracy of FOG, and the optical measuring range of FOG will be reduced accordingly. High-precision FOG usually uses cross-fringe modulation and demodulation algorithm to increase its measuring range, but it can only be started in its optical measuring range, otherwise it will output the wrong angular...
This paper presents three algorithms for calibration of a MEMS accelerometers unit using a simple icosahedron bench constructed from “MOLI” meccano. The report includes the mathematical description of the algorithms, the analysis of their simulation and application, and the algorithms comparison.
In order to preserve SINS algorithmic principles and provide high-efficiency autocompensation it is suggested to apply fixed rotations of some SINS components. Different ways of fixed rotations application for SINS are considered in the paper. The following criteria are defined for analysis of SINS structures with fixed rotations: minimization of weight, dimensions and cost, weakening of requirements...
There are many shortcomings in the traditional way of single-system positioning by Global Navigation Satellite System (GNSS), the biggest limitation of which is that when less than 4 satellites are visible, the 3-D positioning will not be accurate and reliable. Moreover, GNSS signals are frequently blocked by high-rise buildings in urban area. Under this circumstance, it cannot be avoided that multipath...
The paper presents the results from development and testing of a modified small-sized two-antenna GNSS compass containing two GNSS navigation receivers integrated with inertial measurement unit (IMU) on MEMS sensors. The compass has a short antenna baseline (less than the carrier wavelength). Specific feature of GNSS compass consists in arranging the IMU and antenna module on the same rotating platform,...
The paper describes a case study of an inertial attitude determination being prepared for an ice probe on a mission on icy moon of Saturn — Enceladus. The environment of Enceladus, more precisely saying, its rotation rate and gravity acceleration perception by the inertial sensors are emulated in the laboratory. The focus of the study is to assess the influence of the Enceladus' rotation and gravity...
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