SU1318950A1 - Device for checking glide path radio beacon - Google Patents

Description

one

The invention relates to radion geotechnical engineering and can be used in aircraft landing systems.

The purpose of the invention is to simplify the device and increase the accuracy of the control by stabilizing the reflective properties of the reflections.

Control of the glide slope

.. -. ..

radio beacons., CO S TO, and, t FROM transmitter transmitting antyoy, reflector, pemnik with reception of Sh ry antineyny and block registration

From the point of view of accuracy of control, the best form of the reflector is Ellipse with axes

and the distance from its center to the transmitter antenna

G. | (b, + bh}.

2 rm + (h. + Hj)

where is the wavelength;

h ,, h are the heights of the transmitter and receiver antennas, respectively;

d. - distance between these antennas.

If a rectangle with sides a and b is used instead of an ellipse, the deterioration will be insignificant.

 Under the influence of meteorological sediments and grass cover, the radio reflectance of Q would be a meteorological deposition (snow, rain) free properties of the reflector, which leads to a deterioration in the accuracy of control.

To stabilize the reflecting properties of the reflector, it is placed above the surface of the earth at a certain height ho and is made as a set from Editor V. Danko

Compiled by Yu.Korotkih Tehred M.Hodanich

Order 2506/39 Circulation 730 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

individual radio reflective elements, such as cylindrical.

The height of the reflector should be not less than the extreme height of the snow cover observed in the area, but not more than the height at which the glide path reaches the maximum deviation from the given direction. The limiting height he depends on, the height of the transmitter antenna, the wavelength, the glide path angle and the tolerance for its deflection. For specific typical conditions

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Due to the discreteness of the elements of the reflector, some of the radiation energy will pass through the reflector, bounce off the ground, pass through the reflector again and distort the position of the glide path. It is advisable to require that this distortion does not exceed the resolution resolution of the control. This implies the maximum permissible value of K, the coefficient of transmission of radio waves through the reflector in power. This value, in turn, determines the ratio between the dimensions of the elements and the distances between them. For example, for cylindrical elements, 1

 X -iillilhilll-El-i-f 2d h, .h, Rj

a

where R is the radius of the element;

d is the distance between the centers of these elements. The distance d is chosen such that it passes through the reflector. The value of K, in accordance with the specified, should not exceed 0.14. Thus, the above formula allows us to find the radius of a cylindrical element.

Proofreader T. Kolb

Claims (2)

1. DEVICE FOR CONTROL OF A HIGHWAY RADIO BEACON, comprising a transmitter with a transmitting antenna, a reflector, a receiver with a receiving antenna, and a recording unit, distinguished. Yu -a where a, sh e with the fact that, in order to simplify the device, the reflector is made in the form of a rectangle with the sides _j Jj \ _r ^x ar ~ * ~ (h ₄ + ~ h ₂ ) ² ~ ^; »R Ά r + 4h, h, ~ 3 ~ ^X bg + (h, + hj ² “ - the length and width of the reflector, respectively; - the distance between the transmitting and receiving antennas; - radiation wavelength; - the placement heights of the transmitting and receiving antennas, respectively / h ,, h ₂ and the center of the reflector is located at a distance r_ _3 ^r _t 2h ^ £ h _t + ht ^ ~ ”- ^X- xg + ~ (h, + h7) ² ~ from the transmitting antennas. 2. The device according to claim 1, characterized in that, in order to improve the accuracy of control by stabilizing the reflective properties of the reflector, changing under the influence of weather showers and grass cover, the reflector is placed above the ground and is made in the form of a set of radio-reflecting elements, the distance between which provides a free <g the passage of weather showers and the given coefficient of transmission of radio waves, so that for radio-reflecting elements, for example, a cylindrical shape, the radius is determined from the relation] _{+ x} y ¹ 2d h ₄ + h ₂ ί ^R ' ^{4 2} 1π2ίι-7α where K is the specified coefficient of transmission of radio waves through the reflector in power; d is the distance between the centers of adjacent radio-reflecting elements; R is the radius of the radio-reflecting elements, SU., „1318950 1 1318950 2