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Kholopov I.S.,Ryazan State Radio Engineering University
IOP Conference Series: Materials Science and Engineering

The results of strapdown inertial navigation system (SINS) tests with 9 degrees of freedom MEMS sensor MPU-9150 (triaxial accelerometer, gyroscope and magnetometer), pressure sensor LPS331 and ultrasonic range meter HC-SR04, implemented on the FPGA Altera Cyclone-II evaluation board DE1 is considered. SINS measures the spatial coordinates and altitude relative to the starting point, the orientation angles and distances to obstacles along the way. It is shown that the relative error of the spatial coordinates estimation does not exceed 1.1% in interval of some minutes. © Published under licence by IOP Publishing Ltd. Source

Shmatkov V.D.,Ryazan State Radio Engineering University
Problems of Information Transmission

We consider flows in networks analogous to numerical flows but such that values of arc capacities are elements of a lattice. We present an analog of the max-flow min-cut theorem. However, finding the value of the maximum flow for lattice flows is based on not this theorem but computations in the algebra of matrices over the lattice; in particular, the maximum flow value is found with the help of transitive closure of flow capacity functions. We show that there exists a correspondence between flows and solutions of special-form systems of linear equations over distributive lattices. © 2016, Pleiades Publishing, Inc. Source

Ksendzov A.,Ryazan State Radio Engineering University
Proceedings International Radar Symposium

A novel method for the power azimuth spectrum (PAS) estimation in correlated fading channel is proposed. The method is based on the inverse problem solution regarding Fourier basis coefficients of the PAS. The input data is a set of complex correlation coefficients which can be obtained by using a multi-element antenna (MEA) consisting of specially arranged mutually uncoupled thin vibrators those are omnidirectional in the azimuth plane. The proposed method also allows to interpolate the spatial correlation function (SCF) over a bounded area of a MEA setup. The impact of the MEA arrangement on estimation accuracy is also considered. © 2015 German Institute of Navigation (DGON). Source

We consider a simplified algorithm for fusion of greyscale visible and thermal images presented in false colors in the de-correlated YcbCrcolor space. The color gamut is then brought to daylight conditions using a color transfer algorithm that provides the same luminosity of the resulting gray fusion and color fusion images. It is shown that the parallel computing on the graphics card performs real-time video fusion with a frame size of up to 1024×768 pixels and a frame rate of 30 Hz. © 2016, Institution of Russian Academy of Sciences. All rights reserved. Source

The suggested method of joint despeckling and set partitioning in hierarchical trees-based compression for degraded multilook synthetic aperture radar (SAR) images uses a fused image as a reference during compression. The fused image itself is formed from intermediate frames (looks) by the logical operation on wavelet coefficients, which are presented in the form of spatial oriented trees (SOTs) of wavelet decomposition. This decomposition is calculated for one and the same region of the Earth's surface during SAR spacecraft flight. The high-frequency subbands (details) of the fused images contain the smallest wavelet coefficients from different SOTs. The wavelet coefficients related to the low-frequency subband (approximation) are processed by another special logical operation providing a good smoothing. Based on the improved fused image, the best bit rate (optimal operation point) is found by observing the output mean square errors and cross-correlation coefficients between the compressed and reference images. The results of computer modeling and comparison with a few well-known despeckling and compression procedures have shown the superb quality of the proposed method in the sense of different criteria such as peak signal-to-noise ratio, structural similarity, etc. © 2015 Society of Photo-Optical Instrumentation Engineers (SPIE). Source

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