基于马氏距离的雷达网有源假目标干扰鉴别技术

针对雷达网有源假目标干扰问题,为了消除长基线雷达组网时地球曲率对数据处理的影响,通过坐标转换,将各雷达站的目标的量测数据转化到了地心直角(ECEF)坐标系内,得到统一坐标系下的目标量测信息,完成空间上的对准;在此基础上,基于虚假目标的量测与雷达站位置有关,真实目标量测与雷达站无关,因而依据卡方分布的性质,在ECEF坐标系内对各个量测进行卡方检验,鉴别出虚假目标;最后,通过仿真验证了分析的正确性,该算法与工程实际接轨,实用性较强。     

长边条翼身融合过渡曲面的构造方法

 针对飞航导弹长边条翼身融合过渡曲面的构造展开研究,为满足融合过渡曲面过渡线能够由设计人员确定和长边条面必须是等截面的直纹面等要求,综合应用基于局部重新参数化构造过渡曲面和基于物理的能量曲面造型构造过渡曲面方法,并结合导弹弹身曲面是等截面直纹面的特点,通过构造翼身融合面、长边条面和头锥面3张曲面拼接来构造G-1连续的长边条翼身融合过渡曲面。提出了预先构造中间辅助面和辅助基曲面的方法,通过辅助基曲面和弹翼面上重新参数化局部基曲面间线性组合来构造翼身融合面。通过使中间辅助过渡面的边界切矢与弹身的纵向切矢一致,来保证长边条面与翼身融合面间的G-1连续性。最后利用基于物理的能量曲面造型方法构造与弹身和长边条面G-1连续的头锥过渡面。     

Topological model of the solar event including a flare and coronal mass ejection on October 19, 2001

Based on the analysis of a strong solar flare X1.6/2B on October 19, 2001 in the active region 9661, accompanied by a coronal mass ejection (CME) of the halo type, a topological model of development of this solar event is suggested. The model considers a unified process of development of CME and a chromosphere flare. According to the model, this process has a common source of energy supply: the turbulent current layer lying between the arcade of flare loops and the surface of CME going away. The structures on the ends of flare bands (SEFB) represent in this model chromosphere feet of the system of large-scale coronal magnetic arches at the initial stage of the dynamic processes whose evolution results in CME. Peripheral structures (PS) of the flare (elongated double bright emission strips beyond the limits of the active region) are interpreted as chromosphere bases of magnetic field lines that form an external shell (braid) of the CME at the late stage of the flare.     

Some peculiarities of changes in characteristics of proper atmosphere of space objects

We consider the behavior of the proper atmosphere of space objects in interaction with a flow of incident particles and when the orientation of an object changes. An asymmetry in the behavior of a sorption film with respect to an incident flow of atmospheric particles and the flow’s angular characteristics is shown, as well as the film influence on operation of sensors of the spacecraft’s attitude control system. A recommendation concerning usage of heavy gases for technological operations onboard spacecraft is given.     

Parametric resonance in the solar corona

When studying microwave emission of active regions on the Sun, an effect of parametric resonance between 5-min velocity oscillations in the solar photosphere and sound oscillations of coronal magnetic loops modulating the microwave emission has been discovered for the first time. The effect shows itself as simultaneous excitation in coronal magnetic loop of oscillations with periods 5, 10, and 3 min, which correspond to the pumping frequency, subharmonic, and the first upper frequency of parametric resonance. The parametric resonance can serve as an effective channel of transporting the energy of photospheric oscillations into the upper layers of the solar atmosphere. This effect opens up the important prospects in understanding the mechanisms of coronal plasma heating.     

Impact of helio-and geophysical disturbances on thermobaric and climatic characteristics of the Earth’s troposphere

We present the mechanism and the concept of a model of the solar activity impact on thermobaric and climatic characteristics of the troposphere. Both are based on the idea of parametric action. The results of analysis are presented concerning specific features and regularities of changes in temperature regime of the troposphere in the period of variable helio-and geophysical activity, as well as long-term variations of temperature and heat content of the troposphere. The influence of changes in circulation in the atmosphere and ocean on processes in the system atmosphere-ocean-cryosphere is considered: thermohaline circulation of the oceans and energy exchange between the atmosphere and ocean. The revealed regularities find their complete explanation within the context of a model and mechanism of solar activity impact on climatic characteristics of the troposphere that were suggested previously by the authors.     

Theory of type III radio bursts in the interplanetary space: I. Derivation of permittivity tensor for the system consisting of electron beam and solar wind plasma

The tensor of permittivity for the system “electron beam - plasma of the interplanetary space” is derived in the approximation of geometrical optics. The problem is one-dimensional; all parameters such as density of the beam and of the solar wind plasma, and the induction of the interplanetary magnetic field are assumed to be dependent only on the distance to the Sun. The beam is generated by an active region during a solar flare, and it is a source of radio bursts of type III in the interplanetary space. The tensor of permittivity was obtained to close field equations by a material equation. On the basis of these equations it becomes possible to study theoretically the amplitude-frequency characteristics of the radio bursts as disturbances of the above-described beam-plasma system.     

Effect of geomagnetic field disturbances on the adaptive stress reaction of cosmonauts

Investigations of the effect of geomagnetic activity factors on the cardiac rhythm regulation and arterial pressure of cosmonauts during the expeditions onboard the Soyuz spacecraft, and the MIR and ISS orbital space stations was carried out for various durations of flight in weightlessness and, under control. Groups of cosmonauts were inspected under flight conditions outside the geomagnetic disturbances and in ground preflight conditions, during disturbances without them. The presence of specific effect of geomagnetic disturbances on the system of vegetative regulation of blood circulation of cosmonauts during the flight was demonstrated for the first time. The response of cosmonauts’ cardiac rhythm on the magnetic storm is definitely revealed; however, it depends on the initial functional background and, in particular, on the state of mechanisms of vegetative regulation (the duration of flight and adaptation to it).     

Luminescence of the disturbed upper atmosphere in the visible and infrared spectral ranges in the conditions of injection of a high-velocity plasma jet: II. Theoretical interpretation of the luminescence in the visible spectral range

A theoretical interpretation is given to the experimental data on the luminescence in the visible spectral region of the disturbed upper atmosphere in the conditions of injection of a high-velocity aluminum plasma jet (the “Fluxus” experiment). Mathematical models of optical effects are presented. It is demonstrated that the results of the calculations and the experimental data agree satisfactorily. The principal physical and chemical processes responsible for the observed luminescence are determined.     

One method of controlling the motion of an aerospace vehicle during its long flight in the atmosphere

Based on the methods of the theory of optimum control of dynamic systems, as well as the methods of inverse problems of dynamics and the energy principle, a combined method is developed for control of the motion of a flying vehicle of the Aerospace plane type during the long flight in the atmosphere. The disturbed motion is considered under the conditions when there are constraints on the values of control actions and on functions of phase coordinates.