SU1610452A1 - Method of determining profile of parameters of atmosphere - Google Patents

Abstract

The invention relates to atmospheric optics and can be used in geophysics, location, geodesy in the study of the characteristics of the atmosphere. Under a given zenith distance, a light pulse is sent, images of a cross section of the volume of space filled with a light pulse are formed relative to two reference points located at a known distance from each other in height. At both points, the centers of gravity are monitored and the coordinates and their differences are measured, as well as meteorological parameters: pressure, temperature, and air humidity, from which refractive indices are calculated. For the selected I-th point of the path of propagation of the light pulse, the refractive index and the refraction angle are found, along which the profile is constructed taking into account the zenith distance of the direction of the pulse. 1 il.

Description

The invention relates to atmospheric optics and can be used in geophysics, location, geodesy in the study of the characteristics of the atmosphere.

The aim of the invention is to expand the functionality of the method by further defining the refractive index profile. .., -.

The method of determining the profile of parameters of the atmosphere consists in sprinkling a light pulse at a given zenith distance, forming an image of a cross section of the volume of space filled with a light pulse, tracking the center of gravity

images of the cross section of the volume of space with simultaneous measurement, the coordinates of the image center of the image relative to the reference point and the distance to the light pulse, and also track the center of image gravity with the coordinates measured relative to the second reference point located at a known height from the first reference point. The difference between the coordinates of the centers of gravity, air pressure, temperature and humidity at the two reference points, which are used to calculate the display, is measured ;;;; refractive index, and for the selected i-point of the trajectory of propagation of the light pulse, we find the index

O5

4 recounted

tN5

refraction and the angle of refraction, according to which their profile is constructed taking into account the zenith distance of the direction of the pulse.

The formulas for calculating are

nf tg3 Z, Z2

7/2

(one

-b + (b2-4a c;) -

, tgz, (1-tg22,) -n ,, (1-tg2z2) t: gZ2

, (0,5tg22, -l) + tgZi (l-0,5tg2z2) - ur;

a (, -n tg3z2) 0.5,

ri (-1) tg, 5 (1-1) 2 tg3z.,

(2 where Д r | is the difference of the angles of refraction

for two paths;

Z, Z J,

and n, 0 are the zenith distances and refractive indices at the first and second points of reference, respectively,

DG, / L; -arctg B cus (90 ° -zj) -L;, (3

where fu - vertical coordinate in

the second point of reference, L j - the current value of the distance to the position of the pulse in the i-th point of space; B - vertical segment (distance) between reference points.

The choice of the sign in front of the radical in expression (1) is determined by the requirement Kr | which must be greater than one.

The drawing shows the measurement scheme.

The laser pulse of the emitter 1 is formed by mirrors 2 and the optical system 3 and is directed to the atmosphere at a given zenith distance (angle) z. Optical systems 3 and

4 form in the plane of the analyzers

5 and 6 are images of a cross section of a volume formed by a light pulse as it propagates in the atmosphere. With

This system 4 is located at a known height B with respect to system 3. Analyzers 5 and 6 track the movement, images of the cross section of the volume formed by the light pulse in the field of view of optical systems and generate signals entering control units 7 and 8.

L with shago

by analyzers, In blocks 7 and 8, signals uj, ul and uf, U are formed, respectively; the first ones are proportional to the coordinates of the image center of gravity relative to the reference point in the receiving system 3, and the second ones in the system 4 These pairs of signals arrive at block 9 of the calculation. Since the angles of refraction and refractive indices are different for different sections of the path, the latter is divided into

plots L ,, 1.2L; ,,

LL; ,, - Lj,

Simultaneously with the measurement of the indicated pairs of coordinates for two trajectories, the meteorological parameters are measured at the altitudes of the systems 3 and 4 and information is entered from them into the computing unit 9, which implements the algorithm (3),

The magnitudes of the signals Ux, Uu, are proportional to the values of the projections of the centers of the cross sections of the volume, occupied by the light pulse, to the direction of sounding at the corresponding points 1. The angular deviations along the axes X and Y are calculated by the formulas

Vx

 Ku uy

(four)

Q u

.

F

where F is the focal distance of a particular optical system; Ku, Ka - coefficients determined by

  when calibrating. Estimating the accuracy of the proposed method based on equations (1) and (2) leads to the conclusion that the error in determining the refraction angles does not exceed 1–3 angular seconds, and the refractive index of the VIO in relative measure, which satisfies many practical needs.

Claims (1)

Invention Formula A method for determining the profile of atmospheric parameters, including the delivery of a light pulse at a given zenith distance, the formation of an image of a cross section of the volume of space filled with a light pulse, tracking of the center of gravity of the image of a cross section of the volume of space relative to the point of reference and range to the light volume, about t l and 5-161  In order to expand functionality due to the additional definition of the refractive index profile, the center of gravity is monitored when measuring coordinates relative to an additional reference point located at a known height from the first reference point, the coordinate difference is determined nat centers of gravity. at the points of the report, the air pressure, temperature and humidity are measured, the refractive indices are calculated at these points, and the refractive index, the refraction angle and the profile taking into account the zenith distance of the direction of the pulse are found at the selected point of the light pulse propagation path. Compiled by E.Trofimov Editor M. Bandura Tehred M. Khodanych Order 3738 Circulation 341 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101 Proofreader M.Samborsk Subscription