RU2027199C1 - Method of recognizing group moving targets - Google Patents

Abstract

FIELD: radiolocation survey. SUBSTANCE: single targets are separated to groups of like-type targets by means of comparison of readings of amplitude for any pair of single targets. Average ranges are calculated and the highest one is compared with threshold value. Number of groups of like-type targets and number of targets in any group is calculated. Formalized description is compared with standard one according to number of single targets in any group correspondingly to "closest neighbor" law. EFFECT: improved precision.

Description

 The invention relates to radar systems with recognition of various classes of targets.

 One of the known methods for recognizing group goals is a method based on knowledge of the geometric arrangement of single targets, characteristic of a specific group goal [1].

 The main disadvantage of this method is that for many group ground targets (tank and motorized infantry companies, self-propelled guns battery, etc.), the distance between single moving targets and their number are approximately the same. Therefore, this method is ineffective for recognizing group moving targets.

 Methods for recognizing group goals, based on knowledge of the speed or trajectory characteristics of the goals, are also ineffective, since the above goals practically do not differ in speed and trajectory of movement.

 A more advanced way of recognizing group moving targets is a method based on measuring the amplitude fluctuations of Doppler signals reflected from targets, and comparing them with the reference ones [2].

 The disadvantage of the prototype is the high probability of false recognition of group targets due to the dependence of the amplitude of the reflected signal on the angle and range. It is impossible to precisely set the reference values (absolute values of the amplitude fluctuation parameters), and thus recognition is possible only in a limited range of viewing angles and range.

 The aim of the invention is to increase the likelihood of correct recognition of given group goals, reducing the likelihood of false recognition.

 To do this, it is proposed to use the number of groups of the same type of single goals as part of a group goal and the number of single goals in each of the groups to recognize the class of a group goal. To separate single targets, it is proposed to use, for example, the value of the signal amplitude at the central Doppler frequency. Experimental studies of the amplitude characteristics of Doppler signals reflected from moving ground objects with significantly different values of the effective scattering surface (for example, a ZIL and BRDM car), indicators show a high probability of their separation on sections of the route of different profiles and in a wide range of viewing angles.

,

) = min

-

где К - номер класса групповой цели;
i - номер группы;
а^К _i - количество объектов в i-й группе цели K-го класса;

- формализованное описание групповой цели, и принимают решение о принадлежности групповой цели определенному классу.Thus, the goal is achieved by the fact that after the detection of the group target, the single targets are divided into groups of the same type by comparing the amplitude samples for each pair of single targets, calculating their average first ranks. For this, the amplitudes from samples of volume n for the first and second targets are compared in pairs. The first rank is assigned to the target with a larger signal amplitude, the second - with a smaller one. The average first rank for each goal of the pair is calculated, the larger of which is compared with a threshold value. Then, the number of groups of targets of the same type and the number of targets in each group of the same scattering surface is calculated, the formalized description is compared with the reference ones in terms of the number of single targets in each group according to the “nearest neighbor” rule in accordance with the formula
d (

,

) = min

-

where K is the class number of the group target;
i is the group number;
and ^K _i - the number of objects in the i-th group of the goal of the K-th class;

- a formalized description of the group goal, and decide on whether the group goal belongs to a particular class.

Claims (1)

 METHOD FOR RECOGNITION OF GROUP MOVING TARGETS, which consists in the fact that during the observation interval for a group target generate and emit a coherent signal towards the group target, filtering is carried out consistent with the signal, signals from single targets are distinguished, characterized in that the separation of single targets into groups of the same goals by comparing the samples of the amplitude for each pair of single goals, calculating their average first ranks and comparing the larger of them with a threshold value, counting the number of groups of targets of the same type on the effective scattering surface (EPR) and the number of goals in each group are selected, standards that are the same in the number of groups with a recognizable group target are selected, for comparison with the obtained formalized description of the group target, the formalized description is compared with the standards for the number of single targets in each group according to the “closest neighbor” rule and decide on whether the group goal belongs to a particular class.