The method of detection of group objects

 

(57) Abstract:

The invention relates to the field of radar and can be used in radar stations for air traffic control, airspace control. The basis of the invention is the technical task of discovering not resolved group of objects, separated by angular coordinates, which is achievable technical result. The solution is based on the use of properties, namely, that different methods of direction finding group not resolved objects give different bearings. For this purpose, the method of detection not resolved group of objects, based on direction finding, bearing carried out simultaneously in two or more ways and decide there is no unsettled group of objects, if the scatter of the obtained values of the bearing exceeds a threshold. The direction finding is performed using single-channel and q-switched methods. For this purpose, the bearing is determined by the direction of reception of radiation of airborne radio-electronic means and using single-channel or more, and monopulse methods. 2 C.p. f-crystals.

The invention relates to about the of ntrolle airspace.

In the process of management and control requires knowledge of the exact coordinates of all objects in space, to resolve objects separated by angular coordinates 1-2oto detect (recognize) group objects in the event are unable to resolve them.

Resolution on the angular coordinates provide through the use of proper antenna sizes, since the resolution is determined by the width of the beam, a BOTTOM, which in turn is proportional to /d ( - wavelength radars; d is the linear dimension of the aperture of the antenna).

The disadvantage of this method is that in the long wavelength range when the actual values of d it is impossible to provide the above resolution. In this case, the task is: at least detect the presence of the group object, and then may be called short-wave radar to resolve objects within a group (Patent N 2126543). Discover a group object on the basis of its finding.

There are various ways of finding, for example, the direction finding of radio signals on-Board radio-electronic means of the object (the Reference radar, edited by M. of SKOLNIK, M., "Sov. radio", 1978, T. 4, S. 206). The fact of obtaining from b the detection of group object. The disadvantage of this method consist in the fact that groups of objects can emit only one object. For example, when paired object and the presence of radiation of only one of them has one bearing to the radiating object.

Known single-way direction-finding object by measuring the angular position of the center of the package of the reflected signals (Theoretical fundamentals of radar, edited by J. D. Shirman, M., "Sov. radio", 1970, S. 274). The disadvantage of this method is that using this method will identify the coordinates of the center of the total package of the reflected signals from a group of objects, including these coordinates may correspond to a false position of the object. For example, when paired not resolved object, this method provides a bearing between objects (with equal power reflected signals). The most commonly used technical solution is the monopulse method of direction finding, in particular, based on the reception signals with the total pattern (CF) and differential (DN), on the comparison of the amplitudes of the received signals and determining pelengovogo direction (ibid., 301 S., 5.18, and A. I. Leonov, K. I. Fomichev. Monopulse radar, M, Radio and communications, 1984, S. 70-71, III). Largest detect the S. 302, 1st para. above), if it is zero, the direction DNcorresponds to the bearing.

The disadvantage of this method is that it is not applicable for measurements if not resolved group of objects, separated by angular coordinates, because in this case there will be distortion of the phase front of the wave incident on the antenna, and the method may give false bearings.

Let us consider this in more detail.

1. The differential signal channel U0.

There are three possible cases:

a) detected single object, DNrejected from bearing him;

b) has not resolved the group object, the direction DNnot the same as bearing any of the objects;

C) detected no unsettled group object, the direction DNcoincides with the bearing on one of the objects.

2. U= 0

There are two cases:

a) detected a single object, the direction DNcoincides with the bearing;

b) has not resolved the group object, the direction DNnot the same no bearing on one of the objects (method gives "false" Peleng).

From an analysis of these cases shows that when using the sum-dierence method elangovan is for finding a single object. Thus, the disadvantage of the considered methods of direction finding is that group objects, they can give a false bearing, the position of which depends on the composition of the group of objects and properties specific method of direction finding. It follows that the bearings on the group object, obtained in various ways, as a rule, do not match.

The claimed invention is directed to the solution of the following problem: finding not resolved group of objects, separated by angular coordinates.

This problem is solved based on the use of properties, namely, that different methods of direction finding group not resolved objects give different bearings.

This result is achieved in that in the method of detection is not resolved group of objects, based on direction finding, according to the invention the bearing takes place simultaneously in two or more ways and decide there is no unsettled objects, if the scatter of the obtained values of the bearing exceeds the threshold value.

The fact that the direction finding is performed using single-channel and q-switched methods.

The fact that the bearing is determined by e.g. the aqueous ways.

The essence of the invention consists in the following. When browsing space and the detection of, for example, two identical and no unsettled objects single-channel method provides a bearing between objects, and bearing the radiation on one of the objects. The values of the bearings will differ by an amount equal to half of the angular spacing of the objects that will be detected when comparing their values. If you have three objects, receiving radiation from the middle of the object and the symmetric position with respect to it two other possible sign of a group object. To reduce the probability of missing can be used additionally and monopulse method of direction finding.

1. Method detection not resolved group of objects, based on the bearing, wherein the bearing takes place simultaneously in two or more ways and decide there is no unsettled group of objects, if the scatter of the obtained values of the bearing exceeds the threshold value.

2. The method according to p. 1, characterized in that the direction finding is performed using single-channel and q-switched methods.

3. The method according to p. 1, characterized in that the bearing is determined by the direction of the reception radiation Board is

 

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