CONNECTION OF THE INTENSITY OF THE FLUX OF SCR PROTONS WITH THE VELOCITY OF THE CME AND WITH THE FADING OF THE RADIO EMISSION OF THE SUN IN THE DECAMETER RANGE

The relationship between SCR and CME and with fading of the continuum of noise storms and typeIV radio bursts in the decameter range is investigated. It was shown earlier that about 60% of CMEs associated with solar proton events are accompanied by deep fading of the solar radio emission in the decameter range, which coin-cides in time with CME registration. It has also been shown that fading is characterized by fading depth, the frequency bandwidth in which the fading occurs, as well as the duration of the fading and the frequency at which the maximum fading depth is observed. Further detailed studies have shown that for proton events accompanied by fading of the solar radio emission in the decameter range, the relationship between the intensity of the SCR proton flux and the CME velocity is much worse than for events without fading of the solar radio emission in the decameter range. However, it was foundthat for such events, the relationship between the flux of SCR protons and the CME velocity significantly increases if we take into account the fading depth of the solar radio emission in the decameter range.Earlier in (Isaeva, 2019), the results of a study of the relationship between the intensity of fading of the continuum of noise storms with the parameters of X-ray bursts, with the CME velocity and the velocity of coronal shock waves, as well as with the intensity of the SCR proton flux were presented. This paper presents the results of studying the relationship between the intensity of the SCR proton flux withthe parameters of type II and IV radio bursts, as well as with the CME velocity and with the velocity of coronal shock waves, depending on the intensity of fading of the solar radio emission in the decameter range at a frequency of 27 MHz. The frequency of 27 MHz was chosen because in the region of this frequency the maximum fading depth of the solar radio emission in the decameter range is observed.

CALCULATION OF POLARIZATION LOSSES FOR HF COMMUNICATION CHANNEL (Part 1)

The article describes an algorithm for calculating polarization losses, which are one of the energy characteristics of a HF communication channel when planning radio link of various paths and arbitrary relative positions of the receiving and transmitting points. Using the proposed method, numerical modeling of this type of loss for a given set of input parameters of communication link in the decameter range has been carried out. Based on the calculation results, conclusions were drawn regarding the behavior of polarization losses under various conditions.

Detection Characteristics of the Parametric Method of Signal Processing in a Sparse Antenna Array of a Transportable Decameter Range Radar

Introduction. The possibility of application of modified parametric methods of spatial signal processing in a sparse antenna array (SEAA) of the receiving position of transportable over-the-horizon decameter range radar (DRR) intended for all-weather remote monitoring of the shelf zone is considered in this paper. With an operational deployment of DRR on unprepared coast, problems of the equidistant location of antenna elements (AEs) often arise. In the case of nonequidistant AEs location and matched spatial processing, antenna pattern has interference sidelobes, which level can significantly exceed the allowable or calculated one for an equidistant AA. A well-known alternative to matched processing are parametric methods of spectral analysis based on the using of models with a finite number of parameters, but their direct application requires an equidistant sampling of the spatial signal.Aim. The aim of the research is to develop and analyze the method of parametric processing of spatial signals of the SEAA which AEs are located on the line with a random step in the range from λ/2 to several λ, where λ is the DRR wavelength.Materials and methods. To construct the detection characteristics (DC) computer modeling in the MatLab environment, the reliability of which was confirmed by the construction of known and theoretically calculated DC, was used.Results. The developed method includes a procedure of restoring (synthesizing) of artificial signal of equidistant AA with subsequent application of Burg parametric algorithm to obtain an estimate of the angular spatial frequency spectrum. To prove the applicability of the parametric method of SEAA signals processing in the case of location signals detecting, DC were obtained and compared with optimal ones.Conclusions. The obtained results have proved the suboptimality of the parametric method of SEAA signal processing at the random AEs spacing step lying in the range from λ/2 to 3λ, what makes it possible to recommend it for using in transportable DRRs.

INFLATABLE SPHERICAL SPIRAL ANTENNA OF DECAMETER RANGE FOR USE IN POP-UP INFORMATION (EMERGENCY-INFORMATION) DEVICES OF NAVY

The drawbacks of the existing antenna-feeder devices of decameter range used in pop-up information (emergency information) devices are analyzed. A variant of the solution in the form of an inflatable spherical spiral antenna is proposed. The characteristics of the antenna have been calculated, and approximate data have been obtained for the gas injection system and the withstanding wind load.

Метод компенсации пространственно-корреляционного поля естественных радиопомех в цифровых антенных решетках с нелинейным методом обработки сигналов

Целью работы является обоснование метода компенсации пространственно-корреляционного поля естественных радиопомех декамерового диапазона при проектировании конфигураций цифровых антенных решеток с нелинейным методом обработки сигналов. Направленные свойства и помехоустойчивость рассматриваемых антенных решеток для телекоммуникационных и радиолокационных радиоэлектронных систем в значительной степени зависят от сформированного у антенной решетки пространственно-корреляционного поля радиосигналов и радиопомех декаметрового диапазона, которое синтезируются для заданной частоты и полосы пропускания на основе детерминированной зависимости поля радиосигналов и стохастической имитационная модель синтеза радиопомех. С учетом реальных характеристик пространственно-корреляционного поля естественных радиопомех декаметрового диапазона предложен метод его полной компенсации, основанный на предложенном способе расположения элементов антенной решетки. Использование данного метода позволит повысить направленные свойства и помехоустойчивость цифровых антенных решеток с нелинейным методом обработки сигналов для телекоммуникационных и радиолокационных систем.The aim of the work is to substantiate the method of compensation of the spatial correlation field of natural radio interference of the decamer range in the design of configurations of digital antenna arrays with a nonlinear signal processing method. To properties and noise immunity of the considered antenna arrays for lecommunication and radar electronic systems largely depend on the formed antenna array spatial correlation fields of radio and radio decameter range are synthesized for a given frequency and a bandwidth based on determined based on field radiosignal-fishing and stochastic simulation model of the synthesis of interference. Taking into account the real characteristics of the spatial correlation field of natural radio interference of the decameter range, a method of its full compensation based on the proposed method of arrangement of the antenna array elements is proposed. Using this method.