Source: http://www.dspa.ru/en/2017/dsp-2017-1.htm
Timestamp: 2019-04-20 03:06:25+00:00

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Keywords: remote sensing, geometric models, geodesic binding, dynamic models, system identification.
The problem of improving the quality of geometric image processing models in Earth remote sensing systems is considered. It is shown that it is advisable to use analytical models and image analysis data together with reference information. Dynamic geometric models are proposed. Methods of dynamic systems identification are used for the proposed models construction and analysis. Optimal filters of geometric models correction with reference data usage in the cases of real-time and post-processing are constructed. The approach to correcting periodic distortions in geometry by studying the readings of thermal sensors is investigated. The proposed approaches are tested on the data from the geostationary satellite “Electro-L” No. 2.
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Keywords: : fusion, DEM, interferometric processing, stereophotogrammetric processing, reference data.
Artifacts in existing global DEMs are analyzed in this paper. The problem of reference elevation data accuracy improving by collation and combination of existing DEMs, obtained from different sources and containing different errors, is considered. The algorithm of DEM fusion designed to improve the accuracy of elevation data is proposed. The examples of the algorithm results are given.
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Keywords: radiometer, radiometric image, segmentation, Winer's filter, resolution capability, radio brightness temperature.
Study object in this operation is the scanning radiometer with two combined antennas accepting signals in two different frequency ranges. One antenna, has the wide direction characteristic (DC), the second antenna – has narrower DC. Existence of two antennas is defined by need of radiating object properties research for different frequency ranges.
Permission of observation matrix with wide DC is several times worse than the permission of a matrix with narrow DC. Therefore there is a need to increase permission of a matrix with wide DC to permission of a matrix with narrow DC, having saved temperature characteristics of observation objects in two frequency ranges. It is possible to increase permission at the expense of the optical image of a controlled terrain section as reference image. However it is not always possible because of bad weather conditions and night-time. For the radiometer with two antennas the reference image can be received by processing of observation matrix created for narrow DC.
In operation two algorithms allowing to increase permission of a matrix with wide DC to per-mission of a matrix with narrow DC and to save at the same time temperature characteristics of two frequency ranges are offered. Algorithms are based on segmentation of radio thermal image matrix with the best permission. The received segments are transferred to a matrix of the radio thermal image with the worst permission. The second algorithm differs from the first algorithm in existence of additional operations of image recovery by means of Winer's filter that in addition increases image clarity. Results of full-scale tests of algorithms are shown. Accurate are visible images of objects in two matrixes and temperature characteristics of two frequency ranges in color.
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Keywords: adaptation, real weights, training sample set, clutter, rejector filters, rejection efficiency.
The adaptation algorithms with real weights are synthesized and the relevant principles of the adaptive rejector filters (ARF) are considered. The region of the appropriate use of the ARF data determined. The analysis of the ARF efficiency conducted depending on the volume of training sample and clutter parameters.
The aim is to analyze the effectiveness of the ARF with the real weights, depending on the volume of training sample. The analysis led to the conclusion that, despite the loss filter with a complex weighting processing ARF with RWF with a priori unknown parameters clutter provides better performance than conventional maladaptive algorithms with variable weight in processing time. In the marginal efficiency gains rejection clutter data filters in comparison with the known has been installed.
On the basis of the asymptotic properties of the maximum likelihood analyzes the convergence of adaptive algorithms and the value of the loss estimates due to the limited amount of training samples, and proposed adaptive notch filter algorithms analysis method depending on the volume of training sample. The criterion of the efficiency of adaptive rejection algorithms is averaged on the basis of a statistical description of the properties of estimates of unknown parameters of clutter.
The resulting analytical expression averaged criterion establishes a connection with the suppression of clutter characteristics used estimates of parameters of clutter (interperiod correlation coefficients) and makes it relatively easy to select the volume of training sample, depending on the size of allowable loss in the filter efficiency.
Height loss with increasing filter order is due to an increase in the number of correlation coefficients to be estimated for full adaptation. Increasing the width of the spectrum interference leads to increased evaluation rms deviations and also a cause of the loss increase. These expressions allow regardless of wobble settings to choose for the ARF to the RWF arbitrary order volume of training sample on the basis of admissible losses in the marginal efficiency.
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Keywords: voice signals, algorithm of noise reduction, ITU-T Recommendation G.711, artificial neural network, perceptron, Mean Opinion Score, linear regression network, FIR filter, predictor.
In article questions of design of primary coders of the voice signal (VS) on the basis of the artificial neural networks (ANN) are considered. This subject is very urgent as development new algorithms of processing and transmissions of VS in telecommunication systems attracts the considerable interest. In addition, the majority of VS are always in a varying degree subject to action of the acoustic noises (AN). In this regard, it is necessary to enhance algorithms of suppression of acoustic noises also.
Implementation of the adaptive to the level of acoustic noises of the coder of a source of VS with μ-companding based on an artificial neural network is offered. It was succeeded to reach lowering of level of dispersion of an acoustic noise on an output of neural network implementation of the coder of a source of the message in tens of times, on comparing with the standard codec, in case of increase in a signal-to-noise ratio from 7 to 23 dB in case of different dispersion of an acoustic noise, without lowering of subjective appraisal of quality of VS on a scale of Mean Opinion Score (MOS).
Implementation of an algorithm of a prediction of voice signals in voice coders based on ANN is offered. The analysis of a possibility of implementation of the predictor of the VS in voice coders based on ANN is carried out. Advantages of implementation of predictors based on ANN in comparison with the famous predictors based on nonrecursive FIR filters are shown. The possibility of reduction of an order of a prediction from 10% to 60% in case of the same error is proved, and lowering of an error of a prediction from 15% to 70% in case of the same order in case of implementation of predictors on the basis of ANN. Increase in subjective appraisal of quality of VS on MOS scale on 0,1-0,45 points that is essential advantage of these systems.
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Keywords: communication systems, data storage systems, error-correction coding, computer simulation, self-orthogonal codes, concatenated codes, multithreshold decoders, coding gain, communication channel.
The results obtained during the 25-year evolution of the error-correction coding optimization theory (OT) and multithreshold decoding (MTD) methods, which have been created on its basis, are presented. It is shown the MTD provides near to optimal performance even for channels with high noise level. Wherein the complexity of MTD is linear on code length only.
The performance analysis for binary MTDs over Gaussian channel is fulfilled in this paper. It is shown best MTDs can provide coding gain comparable or better than coding gain for known practical implemented error-correction methods as Viterbi decoder for short convolutional codes, decoders for turbo and low-density parity-check codes.
The symbolic error-correction codes over q-ary symmetric channel are discussed. It is shown the symbolic MTDs (qMTDs) solve fully all problems for digital world in transmission, storage and recovering digital data in any information system. The qMTDs are many times better than decoders for Reed-Solomon (RS) codes in error correction and implementation complexity. It allows to claim the qMTDs can replace RS codes in any applications.
In the paper it is shown the MTD algorithms have also no concurrent in complexity and performance over erasure channels.
The methods, properties and possibilities of codes and algorithms allowing improve the MTD and qMTD performance in a simple way and forming very powerful perspective intellectual space for de-coding methods developing are discussed additionally. These new paradigms of OT have allowed to create methods for different coding clusters working effectively near to channel capacity. The development of these methods transfer to new code structure rapidly.
The results presented testify successful decision of main scientific and technological problems for our informational digital civilization – developing of simple methods for achievement of high reliable transmission, storage and recovering for digital information. Solution of these complex problems allows to switch efforts of engineers and scientists for solve new important tasks for our digital world.
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47. Zubarev Yu.B., Zolotarev V.V., Ovechkin G.V., Ovechkin P.V. Optimizatsionnaya teoriya kodirovaniya: itogi 25 let razvitiya, Proc. of 18-th Int. conf. "Tsifrovaya obrabotka signalov i ee primenenie – DSPA 2016". Moscow, 2016, Vol. 1, P. 6-12.
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54. Zolotarev V.V. Sposob obnaruzheniya i ispravleniya stiranii pri prieme diskretnoi informatsii. Patent RF 2611235. Priority date 21.02.2017.
Keywords: dynamic frequency characteristics of filters, shortening of transient processes duration.
We consider the problem of analyzing the frequency characteristics of the filters with incomplete transient(dynamic frequency characteristics). Such tasks are characteristic for the IIR filters, including those based on autoregressive models, and for FIR-filters, in particular moving average filters. A particularly important application of the presented approach is for cascade filters. We analyze the methods of reducing the duration of transients to improve the dynamic frequency characteristics of the filters. The aim of this work is to analyze the extent to which the static and dynamic frequency characteristics of the filters depend on the length of the sample and to develop methods for acceleration of transients in IIR filters.
The article analyzes the methods of calculating the frequency characteristics of the filter for uncompleted transient processes. It is shown that the known methods for calculating the dynamic frequency characteristics of IIR filters in unsteady (transient) mode with increasing sample size yield results that are close in terms of the mean square error, but they differ significantly by the criterion of the maximum deviation. In general, the proposed method with an equivalent length of the sequence leads to smaller errors, and the frequency response is closer to the static characteristic. The initialization method allows to bring the dynamic frequency characteristics closer to static ones and substantially shorten the duration of transient processes in the filter.
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Keywords: correlation dimension, optimal estimation, maximum likelihood estimation, fractal Brownian motion, error probability of edge detection.
The paper deals with the development of algorithms for processing of fractal signals and images. The investigated processes are not considered as a simple set of separate elements with certain characteristics, but as a structure with internal topological connections between the elements. A distinctive property of such structures is the non-integer nature of their dimension, which characterizes the general property of self-similarity.
Description and analysis of the parameters of fractal phenomena are considered in context of the theory of optimal statistical solutions. A statistical interpretation of the correlation integral is used, as the probability of a non-exceeding of a given scale value by distances between vectors formed by signal or image samples in a pseudo-phase space. The correlation dimension is chosen as a fractal measure of signals and images. The algorithms for object and edge detection on the image are obtained by maximum likelihood method.
When solving the task of detecting objects on images, the methods of texture analysis are used, where the correlation dimension is chosen as the texture property. The fractal image is given in the form of a two-dimensional fractal Brownian motion - a fractal Brownian surface, as well as a set of distances between vectors in a pseudo-phase space. A refinement of the description of the distances between vectors in a pseudophase space with considering of their given topological dependence, and their probabilistic description is proposed.
Expressions for the likelihood ratio logarithm are obtained, the error probabilities are calculated for the object and edge detection in case of Gaussian and non-Gaussian approximations. It is shown that the maximum likelihood estimate of the correlation dimension is sufficient statistics for the detection problem. It is proposed to determine the quality of the edge detection by a system of error probabilities - the probability of false edge fields and the probability of skipping the edge.
Algorithm of correlation dimension estimation is modified for case of depended distances between vectors. Geometrical dependence affects the value of dimension estimate. It is shown, that proposed algorithms are effective for correlation dimension estimation due to large amount of data, obtained from radar with synthesized aperture of antenna. Despite of high computational complexity of fractal dimension estimation it is possible to simplify computational process by usage of statistical description.
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Keywords: COFDM, soft demodulator, log-likelihood ratio, VHF band, RAVIS, rotated constellation, constellation rotation.
Method that allows to specify log-likelihood ratio for OFDM signal using DVB-T2’s constellation rotation technique is proposed in the paper.
When OFDM signal is propagated through multipath channel, estimation of channel parameters is necessary for its demodulation. Even the best estimation methods have a non-zero error. As a result, bits which are transmitted through the multipath channel by constellation points with higher amplitude and all other things being equal, have lower reliability. Proposed method allows to specify log-likelihood ratio for OFDM signal with constellation rotation technique by taking into account multiplicative noise component of signal caused by estimation of channel parameters. Unlike the common method, in the proposed method I and Q components are not considered as one-dimension modulated, but method still have low computational complexity.
Results of competitive modeling using terrestrial broadcasting system RAVIS model in DRM+ multipath propagation channel models are listed for cases when constellation rotation technique is used and without it. SNR advantage of using proposed demodulation method is determined. Modeling shows that for QPSK constellation SNR advantage is more than 1 dB with coderate ¾, in range from 0.2 to 0.5 with coderate ½. For 16-QAM constellation SNR advantage is more than 0.3 dB with coderate ¾, with coderate ½ there is no SNR advantage.
Thus, using of constellation rotation technique makes sense with high data rate and low constellation order and can be achieved without significant calculation complexity increase.
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Keywords: phase-coded pulse, mismatched filtering, minimization of integrated sidelobe level.
Sidelobe suppression of a phase-coded radar pulse at the receiver filter output is a classical problem which also arises in many other technical domains. Search for optimal solution of this problem may be often accomplished only by exhaustive search. In a special case of minimizing integrated sidelobe level (ISL) for a fixed modulation sequence the problem may be solved analytically  although resulting performance is not described in the literature. The paper investigates filter output characteristics which may be achieved using this method for a binary modulation sequences and a zero Doppler shift.
x = sR-1, where R is a certain N×N matrix, which is a function of s.
The paper investigates properties of filter output for this solution. Several families of modulation sequences are considered: M sequences, Legendre sequences, and sequences up to length 271 with best known integrated sidelobe level of autocorrelation function (best-ACF family). For each sequence family main characteristics of the filter output are calculated and analyzed: integrated sidelobe level, peak sidelobe level (PSL), loss in signal-to-noise ratio in comparison with matched filer.
For best-ACF family roughly half of the sequences demonstrates approximately linear growth in decibels of the quality criterion Q(m/n), the slope of the function being 8 16 dB for each unity step of the ratio m/n. Loss in signal-to-noise ratio for these sequences is rather low, about 0.5-1.5 dB for m≤2n. Sequences with slope greater than 14 dB are tabulated in the paper.
Main characteristics for Legendre sequences are somewhat worse but they may be used for arbitrary large , where best-ACF sequences are not known. M-sequences have poor parameters so they are not recommended for use in the method considered. Average values for characteristics mentioned above are tabulated in the paper for all three sequence families.
Thus extending the length of the filter response up to (3 - 5)n leads to increasing ISL up to 25-45 dB and PSL up to 45-60 dB for large amount of sequences, keeping the loss in signal-to-noise ratio less than 1 dB. So mismatched filtering minimizing ISL is a useful method applicable not only to short-length sequences but (despite common opinion) to long sequences as well. Modern signal processors enable straightforward implementation of the discussed mismatched filtering in real time.
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