RU2667898C1 - Radiating or illuminated by the external radio-electronic means target path tracking method - Google Patents

Abstract

FIELD: radar ranging and radio navigation.SUBSTANCE: inventions relate to the field of radar ranging and can be used in radar location stations (RLS). Radiating or illuminated by the external radioelectronic means target path tracking method is based on its direction finding by radiations or reflections by means of n≥2 space-distributed direction finders and on the target range calculation, at that, during the space scanning with the active radar (RLS) in the active mode, based on transmitted to the RLS from n≥2 direction finders bearings data, performing the targets bearings independent tracking, eliminating corresponding to the false targets bearings intersection points, on the basis of transmitted data on the real targets bearings, forming bearing change graphs from the direction finders location points, by means of extrapolation determining the bearings values for different time points, based on them calculating ranges to the target, keeping tracking in the passive mode along the bearings and the trajectory range, occasionally updating its position in the active mode, in addition, updating the trajectory location when changing the target radiation parameters or during break in radiation.EFFECT: reduction in equipped with the direction finders RLS active mode using time, during radiating or illuminated by the external radioelectronic means target path independent tracking and exclusion of the false targets.1 cl, 2 dwg

Description

The invention relates to the field of radar and can be used in radar stations (radar).

Radars are designed to control air traffic and to control airspace. A necessary condition for ensuring this management and control is knowledge of the coordinates of all targets located in the zone of responsibility of the radar station. To do this, the measured coordinates of the targets during initial detection should be clarified in the process of their movement, i.e. goals must be followed.

There is a method of viewing space and tracking target trajectories, based on detecting a target in the survey mode and developing strobe tracking target trajectories for tracking them (SZ Kuzmin "Fundamentals of designing systems for digital processing of radar information", M., "Radio and communication", 1986, p. 108-110, p. 115, 1 paragraph above). The transition from the review mode to the tracking mode begins with the detection of the radar of a new elevation (new target), which is taken as the initial elevation of the proposed trajectory of the new target.

On the basis of a priori data on this goal, a primary capture gate is formed for the second review, on the basis of which the strobe parameters for the third review are specified. If the mark in the third review has got into this strobe, then it is considered to belong to the detected path, according to its position in the strobe of the 3rd survey, the strobe parameters for the 4th survey are specified, etc. After fulfilling the established criterion by the number of marks that fall into j sequentially formed gates, a decision is made to detect the trajectory, and it is transmitted for tracking.

Known methods for using the radiation energy of onboard sources of energy targets and energy reflections due to illumination of the target by an external (extraneous) electronic means (RES).

A known method of radar detection and tracking of targets, based on the fact that tracking of the target is carried out using a long-wave radar with determining the range to the target in its active mode and in passive - determination of bearings by radiation of the target (patents RU No. 2137152, No. 2194289).

A known method of monitoring airspace based on the fact that the radar signal is emitted only in those directions of the zone in which the reflected energy of external RES is detected (patent RU No. 2215303).

A known method of radar detection and tracking of targets, based on the fact that they detect the target in the active mode of the radar in direction-finding by the radiation of the target direction and maintain tracking (patent RU No. 2149421).

The disadvantage of these methods is the need to use the active mode of operation of the radar when accompanied.

A known method for determining the coordinates of targets, based on the reception of direct radiation from an external RES source and reflected from the target (patent RU No. 2226701); its disadvantage is the need for direct radiation.

A known method for detecting and determining the coordinates of targets, based on the use of radar radiations located beyond the horizon, with known coordinates (for example, radar from neighboring states) (patent RU No. 2530808); its main drawback is the need to know the coordinates of the radar and its parameters.

The closest method is the triangulation method (Handbook of Radar, edited by Skolnik. M: Sov. Radio, 1978, v. 4, p. 194, 2nd abs. From the bottom), which allows for apart from distributed in space n≥2 direction finders bearings, calculate the range to the target from the relations of a triangle formed by intersecting bearings and a line connecting the location of the direction finders.

The disadvantage of this method is that when using it in a radar equipped with direction finders, they need to be used to inspect the tracking strobe in one limited time interval, especially in the case of a discrete nature of emissions, which eliminates the possibility of independent tracking of targets, and this complicates the control them; in addition, the possibility of the appearance of false targets is characteristic of this method (ibid., as well as p. 203, 2nd paragraph above).

The technical problem to be solved of the claimed invention (technical result) is to reduce the time of using the active mode of a radar equipped with direction finders, with independent tracking of the target emitting or illuminated by an external RES and eliminating false targets.

The technical problem is solved through the use of the triangulation method with independent operation of direction finders and in conjunction with an active radar.

The claimed technical result is achieved by the fact that in the method of tracking the path of a target emitting or illuminated by external electronic means, based on its direction finding by radiation or reflection using n≥2 spacers located in space and on calculating the distance to the target, according to the invention, the bearing data is transmitted to active radar station, while on the radar form graphs of the bearing change from the location of the direction finders, by extrapolation determine the position of bearings for At different time points, they are used to calculate the distance to the target, conduct tracking in the passive mode by bearings and the distance of the trajectory detected in the active mode, occasionally clarifying its position in the active mode.

Also, by clarifying the position of the trajectory when changing the radiation parameters of the target or during a break in the radiation.

The claimed technical result is achieved by the fact that in the active radar station according to the invention, in addition to the active channel, n≥2 spaced in the direction finders radiating or illuminated by external electronic means means are introduced, the outputs of the direction finders are connected to the radar inputs.

Also, the fact that one of the direction finders is structurally combined with radar equipment.

The invention is illustrated by drawings. In FIG. 1 shows the process of detecting a target’s trajectory in active mode and the transition to tracking it in passive mode; figure 2 - the process of forming graphs of changes in the bearing of the target from the location of direction finders P ₁ and P ₂ .

Let us explain the essence of the inventions by the example of the operation of a two-coordinate active radar, in which, in addition to the active radar channel, n = 2 passive (spaced apart in direction finders P ₁ and P ₂ ) are introduced.

Consider the initial version of work for a new goal: let the directions of the rays of the antennas of the active and passive channel (P ₁ coincide (for the case when one of the direction finders is structurally combined with the radar equipment) and the moment of direction finding of the target using P _{1 is} ahead of P ₂ .

If at the time t _{1, the} active radar channel detects the first mark C ₁ from the radiating target, the passive channel β _1t1 is determined using the passive channel P ₁ (Fig. 1, Fig. 2). By the time the criterion for detecting the target trajectory in the active mode is fulfilled (fulfilling the criterion with j gates, see. L. 1), according to the passive channel, a bearing change graph consisting of j points will be constructed; similarly, a graph will be constructed according to the data of the passive channel P ₂ , consisting of (j-1) points (with the equality of the review periods P ₁ and P ₂ ) (see Fig. 2).

According to the active radar channel, by the time moment t _j, a decision will be made to detect the target trajectory and to transfer it for tracking, a tracking strobe with the predicted target position C _{j p} in the center of the strobe will be set. From this point in time, the active radar mode for this purpose is not used.

(пунктир на фиг. 2). Точку пересечении пеленгов С _{j э} принимают за положение цели в момент времени t_j, учитывают ее параметры для установки строба для момента времени t_(j+1). В момент времени t_(j+1) по данным пеленгатора П₂ определен азимут β_2t(j+1), а данные от пеленгатора П₁ имеются только на момент t_j<t_(j+1), поэтому за счет экстраполяции его графика определяют β_1t(j+1)э (пунктир на фиг. 2). Точку пересечении пеленгов С принимают за положение цели в момент времени t_(j+1) и учитывают ее параметры для установки строба для момента времени t_(j+2) и т.д.At time t _j , the azimuth β _{1tj is} determined from the direction finder P _{1 data} (Fig. 1, Fig. 2), and according to the direction finder P ₂ data are available only at the time t _i <t _j , therefore, by extrapolating its graph,

(dotted line in Fig. 2). The intersection point of bearings C _{j e is} taken as the position of the target at time t _j , its parameters are taken into account to set the strobe for time t _{(j + 1)} . At time t _{(j + 1)} according to the direction finder P ₂ is defined azimuth β _{2t (j + 1)} and data from the direction-finder P ₁ are only at the time t _j <t _{(j + 1),} however due to the extrapolation of its graph determine β _{1t (j + 1) e} (dashed line in Fig. 2). The intersection point of bearings C is taken as the position of the target at time t _{(j + 1)} and its parameters are taken into account to set the strobe for time t _{(j + 2)} , etc.

In the example considered, it is assumed that the determination of the bearing using P ₁ occurs simultaneously with the detection in the active mode of the first elevation from the target. This coincidence does not matter for the functioning of the method; in order to exclude the active mode from the tracking process, it is important that by the time moment t _{j of} the decision to detect the trajectory the process of building graphs of the bearing change is going on, which will always be done if the period of viewing the space using direction finders is no more than the radar; this will provide an opportunity to start tracking in passive mode immediately after a decision is made to detect a trajectory in active mode. A delay in plotting will delay the tracking process in passive mode, which will reduce the effectiveness of the method in reducing the time it takes to use the active mode.

The addition of the signs of the triangulation method with other signs in the inventive method eliminates the above-mentioned problem of false targets inherent in the triangulation method, since the detection of the trajectory of a real target is carried out as a result of a space survey using the radar in the active mode, and therefore, in the inventive method, only the trajectories of real targets are tracked (i.e. Bearing intersection points corresponding to false targets are eliminated when viewing the space using the radar in active mode).

Thus, the process of tracking the trajectory of a target radiating or illuminated by an external electronic means is carried out without using the active radar mode and false targets are eliminated. This achieves the claimed technical result.

Claims (2)

1. A method for tracking the trajectory of a target radiating or illuminated by an external electronic means, based on its direction-finding by radiation or reflection using n≥2 direction-finding radars and on calculating the distance to the target, characterized in that when viewing the space using an active radar station ( Radar) in active mode, on the basis of data on bearings transmitted to the radar from n≥2 direction finders that independently monitor the bearings of the targets, eliminate the intersection points of the bearings, respectively for false targets, on the basis of the transmitted data about the bearings of real targets, form the graphs of the bearing change from the location of the direction finders, extrapolate determine the values of the bearings for different points in time, calculate the ranges to the target on their basis, conduct tracking in the passive mode by direction-finding and trajectory ranges, occasionally clarifying its position in active mode. 2. The method according to p. 1, characterized in that they specify the position of the trajectory when changing the radiation parameters of the target or during a break in the radiation.

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