SU1122986A1 - Wind shift determination device - Google Patents

Description

1 The invention relates to metroloids and can be used in meteorological flight support; Apparatus for the rapid remote sensing of vertical component of wind speed in the atmospheric surface layer in the area of the runways of airfields Methods are known for determining wind shear using contact sensors installed on meteoma "1 max at aerostats." However, these methods cannot be used to determine shifts at altitudes greater than 50 m, since the construction of airfields near a height of more than 50 m of airfields is prohibited by safety measures. When using radiosonde NIL or balloon pilot observations, it is possible to obtain wind data only for heights of more than 200 m due to difficulties in tracking the radiosonde or the pilot in the lower atmosphere. In addition, the launch of radiosondes or pilot balloons is timed for certain periods, and therefore it does not provide for the one to obtain wind data ij. The radioacoustic method for determining wind shear, based on the dependence of the limiting height, is the closest to the technical essence of the invention. radio acoustic sounding on the magnitude of the horizontal shear modulus of the wind speed. The method is based on emitting a vertically. In an atmosphere of an acoustic pulse with sinusoidal filling, irradiating the inhomogeneities of the medium under the action of an acoustic pulse by continuous electromagnetic radiation with a wavelength equal to twice the wavelength of acoustic oscillations, receiving the reflected electromagnetic radiation, determining the echo signal duration and comparing it with a predetermined addition of echo signal in the absence of wind 2. The disadvantage of the known method is the impossibility of determining shear vertical components of wind speed, I The purpose of the invention is to determine the shear vertical components of wind speed.

quarter-wavelength electromagnet-86 The goal is achieved by the method of determining wind shear, which is based on emitting an acoustic pulse vertically into the atmosphere with a sinusoidal filling., irradiations produced by an inhomogeneity of the medium by an acoustic pulse by continuous electromagnetic oscillations with a wavelength equal to twice the length waves of acoustic oscillations, and the reception of electromagnetic oscillations reflected from medium inhomogeneities, successively emit a pair of coherent acoustic their pulses with a spacing interval equal to an odd number of quarters of the wavelength of electromagnetic radiation, measure the power of the received total radar echo from a pair of acoustic pulses and determine the shift of the vertical component of the wind speed by the formula -l- "tf2P arccosl V. de Sw kp shift vertical wind speed components; electromagnetic radiation wave number; electromagnetic radiation wavelength, received total radar echo power} maximum amplitude of total radar echo signal with common-mode addition of electromagnetic fields scattered from a pair of coherent acoustic pulses; the initial spatial interval of the acoustic pulses} t is the time interval of the acoustic pulses. The method is based on the fact that, when a continuous electromagnetic emission is simultaneously cleared from a pair of bushy pulses at the receiving antenna of the radar, vectors are added together by fields scattered by each acoustic pulse. With the distance between two acoustic pulses equal to an odd number

The radiation emitted by these pulses is mutually compensated. When propagating along the sounding path, the wind speed along which is constant, the distance D is also constant and equal to an odd number of quarters of the wavelength of the electromagnetic radiation. In this case, the total electromagnetic field at the input of the radar receiver is constantly zero.

If there is a shift in the vertical component of the wind speed, the distance between a pair of acoustic pulses

I

change, condition & r- ()

is disturbed, and incomplete compensation occurs for electromagnetic fields scattered from acoustic pulses. A signal of a certain amplitude appears at the receiver input, depending on the value of U, and, consequently, on the shift value of the vertical component of the wind speed. Thus, the amplitude of the total echo signal depends on the shift value of the vertical component of the wind speed.

The coefficient D is equal to the maximum amplitude of the echo signal with the in-phase addition of electromagnetic fields scattered from a pair of acoustic pulses, and can be determined before taking measurements during the calibration process.

Since it is not necessary to determine the velocity of propagation of an acoustic pulse when measuring the vertical component of the wind speed by the proposed method, the use of a Doppler radar is not necessary and a simpler and cheaper noncoherent radar can be used.

The drawing shows the setup diagram that implements the proposed method.

The installation contains an acoustic emitter 1, a transmitter 2 of a radar station, a receiver 3 of a radar station, a measurer 4 of the power of the radar signal.

The measurement of the shift of the vertical component of the wind speed by the proposed method is carried out as follows.

Using a coherent acoustic radiator 1, a pair of coherent acoustic pulses with a sinusoidal filling with a distance between them in the space of b

 ,

 t (2 + 1), where n is an integer} the wavelength of the electromagnetic; radiation. Using transmitter

Two radar stations irradiate the acoustic pulses propagating in the atmosphere by continuous, electromagnetic radiation. The total echo signal reflected by a pair of acoustic pulses is received by the receiver 3 of the radar station, the power P of the echo signal is measured using a power meter 4 connected to the output of the receiver

radar, calculate the shift of the vertical component of the wind speed by the formula

with f 2P 1 g

5w Tir orccos n) .u, J.,

29

d k

wave number elektK. magnetic radiation,

T is the wavelength of the electromagnetic radiation P is the measured power

echo signal

  a predetermined constant coefficient;

: Le

AO (1 + 0 - nanzgB1Shy :: spatial interval of a pair of acoustic pulses,

The time interval for a pair of acoustic pulses. The invention makes it possible to determine not only the temperature profiles, but also the shift of the vertical component of the wind velocity network.

Claims (1)

(.57) METHOD FOR DETERMINING WIND SHIFT, based on the emission of an acoustic pulse vertically into the atmosphere by sinusoidal filling, irradiation of inhomogeneities of a medium by continuous electromagnetic waves with a wavelength equal to twice the wavelength of acoustic vibrations, reception of electromagnetic waves reflected from inhomogeneities, characterized in that, in order to determine the shift of the vertical component of the wind velocity, a pair of coherent a of pulsed pulses with a spatial repetition interval equal to an odd number of quarters of the wavelength of electromagnetic radiation, measure the power of the total radar echo signal from a pair of acoustic pulses and find the shift of the vertical component of the wind speed according to the formula where 5 _W is the shift of the vertical component of the wind speed) electromagnetic wave number ·, * X _e - wavelength of electromagnetic radiation, ' P is the power of the received total radar echo - § signalζ O is the maximum amplitude of the total radar echo signal when the in-phase addition of electromagnetic d fields scattered from a pair of coherent acoustic pulses; · Th _b ”(.2n +1) - the initial spatial interval of the sequence of acoustic pulses, * + - the time interval of the sequence of acoustic pulses. bottom layer