The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
1. Depending on probabilistic characteristics of unknown initial phase, the algorithms of optimal detection of reflected signal are first synthesized at the use as soundings stochastic radio signals.
The paper considers signal processing algorithm for reconstruction of integral water content and water content profile in a cloud. Based on numerical simulation it was shown that curve of brightness temperature of clouds versus its integral water content does not depend on the type of water content profile or cloud thickness. Results of integral water content and water content profile experimental...
The peculiarities of using dipole scattering method for calculation of radar reflectivity from non-spherical rain particles are discussed. As well the choice of raindrop shape model is considered and comparison of different approaches to calculation of electromagnetic scattering is performed. It is shown that use of dipole scattering method is validated when particles diameter does not exceed 3 mm...
The detector structure of radar reflections at distribution of radio waves, both in ordinary linear and in dispersion mediums when using the stochastic sounding radio-frequency signals is obtained. The analysis is carried out both for mono-, and multi-position radar systems, when reflected and reference signals are coherent, as well as with partial or complete violation of this coherence.
There is a lack of published experimental forward-scattering radar sea clutter data at very low (almost zero) grazing angle over the sea. This data is necessary to provide a fundamental understanding of the operating environment for the development of forward-scatter radar systems for maritime applications. Experimental data has therefore been recorded at frequencies of 7.5 GHz, 9.3 GHz, 24 GHz, and...
The development of the sensor on the base of coherent radar for measuring of absolute velocity of farm tractors is discussed. The structural scheme, components design and data of the full-scale test are also presented as well as the recommendations concerning use of the sensor.
The problem of remote sensing for of active impact on clouds is considered. The main peculiarities of climate in Ukraine and methods of active impact are discussed. It was shown that climate in Ukraine requires using of such methods for mainly two reasons: protection of agriculture crops (defence against hail) and stimulation of precipitation. Therefore the remote measurement of clouds parameters...
The paper is devoted to study an algorithm for processing of a coherent signals scattered by pedestrian, vegetation and precipitation. The bispectrum signal processing permits to increase signal-to-noise ratio due to capability of bispectrum to suppress the almost Gaussian noises. An experimental study in 8-mm waveband by coherent radar was performed and confirmed the assumption made before. The gain...
The paper is devoted to an algorithm for processing of a like-noise signal that corresponds to volume scatterers in turbulent steams. The algorithm is based on properties of the signal correlation functions and as the experiments showed the algorithm provides gain in signal-to-noise ratio more then 20 dB.
A microwave coherent homodyne and polarimetric ground surveillance Doppler radar is employed for collecting the radar returns from moving objects. Nonstationary nonlinearly frequency-modulated and multicomponent backscattered signals are analyzed and described as a sum of Doppler frequency-shifted polynomial chirp-like components. Instantaneous frequencies corresponding to the radiation backscattered...
A new approach to time-frequency analysis of radar echo responses obtained from moving objects is represented. The suggested approach is based on the extraction of phase-coupled harmonics from time-varying bispectrum estimates of transient sequences separated from the total radar backscattered signal by a sliding window. A coherent, homodyne, and continuous-wave radar has been employed for measuring...
The results of experimental study of backscatter spectral -polarization features from above-water and surface objects are presented. Investigations were carried out with coherent systems both with the pulse and CW modes of millimeter and centimeter wave bands (from 10 sm to 2 mm). The informative features are concerned with modulation both the amplitude and Doppler translation are condition on modulation...
The results of experimental study of backscatter spectral - polarization features from above-water and surface objects are presented. Investigations were carried out with coherent systems both with the pulse and CW modes of millimeter and centimeter wave bands (from 10sm to 2mm). The informative features are concerned with modulation both the amplitude and Doppler translation are condition on modulation...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.