scholarly journals Экспериментальные исследования возможности регистрации шумоизлучения морского объекта в неблагоприятных гидрологических условиях при использовании адаптивной фильтрации помех

Author(s):  
R.V. Viktorov ◽  
M.V. Dyagilev ◽  
A.V. Krupenkov

В настоящее время при всплытии подводного объекта, особенно в неблагоприятных гидрологоакустических условиях не обеспечивается его безопасность от столкновения с морскими целями. Показано, что для решения этой проблемы возможно применение в типовом тракте гидроакустической системы обнаружения использование линейного фильтра Калмана. Представлены результаты имитационного моделирования показывающие принципиальную возможность регистрации малошумных объектов в неблагоприятных условиях, при обеспечении всплытия подводного объекта. Приведены результаты морских экспериментальных исследований, которые показывают, что применение в гидроакустическом тракте обнаружения линейного фильтра Калмана позволяет подавить фоновую помеху моря, гидродинамические шумы и шумы дальнего судоходства на приемном устройстве и выделить сигналы шумоизлучения морского объекта при низких входных отношениях сигнал/помеха. Показано, что применение в тракте обработки адаптивного фильтра Калмана позволяет повысить выходное отношение сигнал/помеха, а также существенно увеличить время наблюдения за надводным объектом.For the ascent of the underwater object, especially in adverse conditions gidroakusticheskikh not ensured his safety from collision with the sea objectives. It is shown that to solve this problem it is possible to use a linear Kalman filter in a typical path of a hydroacoustic detection system. The results of simulation showing the principal possibility of registration of low-noise objects in adverse conditions, while ensuring the surfacing of an underwater object. The results of marine experimental studies, which show that the use of a linear Kalman filter in the sonar detection path allows to suppress background noise of the sea, hydrodynamic noise and noise of long-distance navigation at the receiver and to highlight the noise emission signals of the marine object at low input signal/noise ratios, are presented. It is shown that the use of an adaptive Kalman filter in the processing path can increase the output signal / noise ratio, as well as significantly increase the time of observation of the surface object.

2013 ◽  
Vol 62 (2) ◽  
pp. 251-265 ◽  
Author(s):  
Piotr J. Serkies ◽  
Krzysztof Szabat

Abstract In the paper issues related to the design of a robust adaptive fuzzy estimator for a drive system with a flexible joint is presented. The proposed estimator ensures variable Kalman gain (based on the Mahalanobis distance) as well as the estimation of the system parameters (based on the fuzzy system). The obtained value of the time constant of the load machine is used to change the values in the system state matrix and to retune the parameters of the state controller. The proposed control structure (fuzzy Kalman filter and adaptive state controller) is investigated in simulation and experimental tests.


Micromachines ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 164
Author(s):  
Dongxu Wu ◽  
Fusheng Liang ◽  
Chengwei Kang ◽  
Fengzhou Fang

Optical interferometry plays an important role in the topographical surface measurement and characterization in precision/ultra-precision manufacturing. An appropriate surface reconstruction algorithm is essential in obtaining accurate topography information from the digitized interferograms. However, the performance of a surface reconstruction algorithm in interferometric measurements is influenced by environmental disturbances and system noise. This paper presents a comparative analysis of three algorithms commonly used for coherence envelope detection in vertical scanning interferometry, including the centroid method, fast Fourier transform (FFT), and Hilbert transform (HT). Numerical analysis and experimental studies were carried out to evaluate the performance of different envelope detection algorithms in terms of measurement accuracy, speed, and noise resistance. Step height standards were measured using a developed interferometer and the step profiles were reconstructed by different algorithms. The results show that the centroid method has a higher measurement speed than the FFT and HT methods, but it can only provide acceptable measurement accuracy at a low noise level. The FFT and HT methods outperform the centroid method in terms of noise immunity and measurement accuracy. Even if the FFT and HT methods provide similar measurement accuracy, the HT method has a superior measurement speed compared to the FFT method.


Author(s):  
Lifei Zhang ◽  
Shaoping Wang ◽  
Maria Sergeevna Selezneva ◽  
Konstantin Avenirovich Neysipin

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