Combined radar-acoustic antenna for application in wind-power engineering

Energy efficiency and fail-safety of modern wind turbines (WT) are largely determined by their ability to the temporal "tuning" under the spatial variability of the wind field.The paper examines the possibility of implementing the combined radar-acoustic antenna (CRAA), which is placed on the horizontal-axis wind turbine for the horizontal radio-acoustic wind sounding system (HRASS). The main antenna feature is the use of the developed antenna parametric working mode at acoustic waves, which ensures the high directivity of the acoustic probing radiation at the limited antenna aperture. The basic version of the CRAA design, intended for installation on the horizontal-axis wind turbine includes an ring multi-element acoustic radiator, in the interior of which the pulse-Doppler radar antenna unit is installed.The radio-acoustic hardware operates in accordance with the special quasicontinuous mode when using radio pulses of large spatial extent, together with short acoustic pulses

Combined antenna for a mobile system of radioacoustic sounding

Combined radar-acoustic horn-reflector antenna has been developed for a mobile radioacoustic and acoustic sounding system. The antenna beamwidths at acoustic and electromagnetic waves are equal. The system works according to the inclined radioacoustic method (IRAS) and is intended for measuring profiles of temperature, wind and atmospheric turbulence intensity at the heights of about 500 m

Low-height radiation field of the coastal radar antenna taking into account troposphere inhomogeneities

A procedure is considered for defining the presence of the tropospheric waveguide based on the shape of the phase-plane portrait, with which it is convenient to describe the behavior of all combinations of radio wave trajectories. A rough model of the spatial distribution of the troposphere refractive index n(x, z) near the sea coastline is given. The minimum information needed for model construction is from two separated vertical profiles of n(z) in the troposphere, which can be obtained by radio-acoustic sounding

Noise-protected antenna for a pulse acoustic atmospheric sounder

Antenna systems of modern acoustic atmospheric sounding technique (SODAR) are among the most functionally important and expensive of its constituents. The successful versatile SODAR application is directly related to the high-quality indexes of the acoustic antenna, such as noise protection in relation to acoustic ambient noise.In the present work, on an example of worked out by authors SODAR, the questions of acoustic noise protected hybrid budget antenna creation are considered in a practical way. Main attention is given to the original construction of transceiving acoustic phased array which is a constituent of the antenna