Method of adjustment of optical axis of viewfinder and electrical axis of aerial

IPC classes for russian patent Method of adjustment of optical axis of viewfinder and electrical axis of aerial (RU 2252427):

G01S7/40 - Means for monitoring or calibrating

G01R29/10 - Radiation diagrams of aerials

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FIELD: radiolocation.

SUBSTANCE: viewfinder is disposed at specific distance from mechanical axis of aerial. Viewfinder is tightly connected with antenna aperture plane. Optical axis of viewfinder is directed in parallel to mechanical axis of aerial. Then electrical axis of aerial is guided to phase center of ancillary aerial which is disposed together with geodetic mark onto post. Optical axis of viewfinder is guided onto geodetic mark. Geodetic mark is tied to angular position detectors and stays apart from phase center of ancillary aerial for distance being equal to shift of viewfinder from mechanical axis of aerial to the plane of normal optical axis of viewfinder. Optical axis of viewfinder is guided onto center of aperture of ancillary aerial. Difference in coordinates is determined by angle of location of initial and final position of viewfinder optical axis. Sword is turned around axis being perpendicular to plane of sword and crossing center of ancillary aerial aperture by angle determined by the relation given in the description of the invention. Electrical axis of aerial is guided onto phase center of ancillary aerial and optical axis of viewfinder is guided onto geodetic mark.

EFFECT: improved precision of adjustment.

2 dwg

Now the present invention relates to the field of radar and can be used when aligning the antenna of the radar stations.

Under the alignment of the antenna refers to the setting of relative position in space of the reference axis of the antenna associated with the sensors of its angular position, and the electrical axis of the antenna. The location of the reference axis in the binding process sensors on geodetic marks on the ground is carried out using optical instruments. For axisymmetric mirror antenna alignment checks for the axis deviation of the antenna from the optical axis of the reticle installed parallel to the geometric axis of the antenna.

There is a method of determining the angular deviation of the axis of the reticle from the electrical axis of the antenna [1], which is as follows: near the aperture of the antenna 1 at a certain distance from the axis of the antenna set and rigidly connected with the plane of the aperture of the reticle 2 with coordinates a and b along the axes X and Y (see figure 1). On the tower 3 located at a certain distance from the antenna, install the shield 4, which is placed geodetic mark 6 and the auxiliary antenna 5 as a radiator. Geodetic mark 6 is removed from the phase center auxiliary antenna 6 at distances a and b along the axes X’ and Y’equal to the displacement of the reticle 2 from the axis of the antenna 1 in the plane, n is malnoy line of sight. For geodetic Marche 6 cable sensors angular position of the antenna 1. The electrical axis of the antenna 1 by the methods of minimum of [2] are sent to the phase center of the auxiliary antenna 5. If the optical axis of the sight is not parallel to the electrical axis of the antenna, the cross hair will not coincide with the geodetic mark. On the angular deviation of the optical axis of the reticle from the direction to the geodetic mark determine the angle between the optical axis of the reticle and the electrical axis of the antenna.

This solution has a major drawback. To the position of the geodetic marks exactly correspond to the position of the reticle on the distance from the phase center of the auxiliary antenna, the coordinate axes X and X’ or Y and Y’ must be parallel. Otherwise, an error occurs when determining the angular deviation of the optical axis of the reticle from the electrical axis of the antenna and the greater the angle between the axes X and X’, the greater will be the error. In practice rig (Y axis’) and azimuthal axis of antenna rotation (Y axis) is some angle that causes the error when determining the angular deviation of the optical axis of the reticle from the electrical axis of the antenna.

The task of the invention is to improve the accuracy of alignment of the optical axis of the reticle and the electrical axis of the antenna. The solution of this problem is achieved by the fact that the act is both the alignment of the optical axis of the reticle with the electrical axis of the antenna, which consists in placing at a certain distance from the mechanical axis of the antenna of the Vizir, rigidly connected to the plane of the aperture, the optical axis is set parallel to the mechanical axis of the antenna, pointing methods minimum electrical axis of the antenna phase center auxiliary antenna located together with geodetic mark on the tower, and the alignment of the optic axis of the reticle mark on the geodesic and geodesic brand is bound to the sensors of the angular position of the antenna and removed from the phase center auxiliary antenna by a distance equal to the offset of the reticle from the mechanical axis of the antenna in the plane normal to the optical axis of the viewfinder, advanced optical axis of the camera is directed to the center of the aperture of the auxiliary antenna, determine the difference between the coordinates in elevation of the initial and end positions of the optical axis of the reticle and the shield rotates around an axis perpendicular to its plane and passing through the center of aperture of the auxiliary antenna on the corner

where α₁that α₂values of the sensor of angular position of the antenna in elevation, respectively, when the target channel was aimed at surveying the brand and on the phase center auxiliary antenna;

L is the distance between the auxiliary antenna and the Vizir

And the geodesic distance between the brand and the center of the aperture of the auxiliary antenna.

Then bring the electrical axis of the antenna phase center auxiliary antenna and the optical axis of the reticle on geodetic mark.

The proposed method is illustrated by figure 2, where 1 - ushiroyama antenna; 2 - Vizir; 3 - tower; 4 - shield 5 - auxiliary antenna; 6 - geodetic mark.

The method of aligning the optical axis of the reticle and the electrical axis of the antenna is as follows: near the aperture esteruelas antenna 1 is installed and rigidly connected with the plane of the aperture of the reticle 2 (see figure 2) with coordinates And the X-axis and 0 on the axis Y. the Y Axis parallel to the azimuth axis of rotation of the antenna 1, and the origin of coordinates coincides with the mechanical axis of the antenna 1.

At a certain distance from esteruelas antenna 1 is installed tower 3, and on it place the shield 4. On the shield have 4 auxiliary antenna 5 as emitter and geodetic mark 6. In the coordinate system X’, Y’ geodetic mark 6 has coordinates along the axes X’ and 0 on the Y-axis’. Axis X’, Y’ respectively parallel to the axes X, Y. the origin of coordinates X’, Y’ coincides with the phase center auxiliary antenna 5. For geodetic Marche 6 cable sensors angular position of the antenna 1.

Using the rotator antenna 1 electric the forge axis of the antenna 1 by the usual methods of minimum of [2] suggest the phase center auxiliary antenna 5. Then the optical axis of the camera is directed to the center of the aperture of the auxiliary antenna 5 and determine the difference between the coordinates in elevation of the original α₁and the final α₂the position of the optical axis of the reticle. This operation is carried out to determine the angle between the axes X and X’. If the axes are parallel, that α₁=α₂. If the angle between the axes X and X’ shield rotates around an axis perpendicular to its plane and passing through the center of aperture of the auxiliary antenna on the corner γ.

After the performed operation axis Y’ and become parallel. Then bring the electrical axis of the antenna phase center auxiliary antenna and the optical axis of the reticle mark on the geodesic. As a result of operations with great precision set the optical axis of the camera parallel to the electrical axis of the antenna.

Sources of information

1 Lntegral, Lai, Vietoris and other Methods of measuring the characteristics of microwave antennas. Edited Namzatovna. - M, Radio and communications, 1985, - 114 C.

2 Umizaru, Whackaloons, Ukito and other Radio system. - M, Owls. radio, 1986, - 40-44 C.

The method of aligning the optical axis of the reticle and the electrical axis of the antenna, which consists in placing at a certain distance from the mechanical axis of the antenna of the Vizir, rigidly connected to the plane of the aperture of the antenna, the optical axis is set parallel to the mechanical axis of the antenna, pointing methods minimum electrical axis of the antenna phase center auxiliary antenna located together with geodetic mark on the shield installed on the tower, and the alignment of the optic axis of the reticle mark on the geodesic, while the geodetic mark attached to the sensors of the angular position of the antenna and removed from the center of the aperture of the auxiliary antenna by a distance equal to the offset of the reticle from the mechanical axis of the antenna in the plane normal to the optical axis of the reticle, wherein induce optical axis of the reticle on the center of the aperture of the auxiliary antenna, determine the difference between the coordinates in elevation of the initial and final provisions the optical axis of the viewfinder and turn the shield around an axis perpendicular to the plane of the shield and passing through the center of aperture of the auxiliary antenna on the corner

where α₁that α₂values of the sensor of angular position of the antenna in elevation, respectively, when the optical axis of the reticle is aimed at surveying the brand and the center of the aperture of the auxiliary antenna;

L is the distance between the auxiliary antenna and the Vizir;

And the geodesic distance between the brand and the center of the aperture vspomogatelnaya,

then bring the electrical axis of the antenna phase center auxiliary antenna and the optical axis of the reticle on geodetic mark.