The method of determining the horizontal range goals for radiation scanning of the radar

 

The invention relates to radar systems and can be used in ground-based and airborne radar mode passive detection and measurement of coordinates of the non-emitting targets. Achievable technical result of the invention is to extend the scope of application of the method measurement range goals to the case of arbitrary relative position of the receiving position and the scanning radar. The invention lies in the fact that the height of the radar, in addition to the angle-scanning radar, the angle at the receiving position, the time delay of the reflected signal relative to the direct and elevation targets relative to the receiving position, additionally measured the elevation angle of the radar relative to the receiving position and the horizontal range of the target is determined by a mathematical expression. 2 Il.

The invention relates to the field of radar and can be used in terrestrial radio-mode passive detection and measurement of coordinates of the non-emitting targets.

There is a method for passive determination of the range of destination using the signal search radar (L. B. Brant. Handbook on methods for jamming and anti-jamming systems with radar control, 1987).

the m beam in the horizontal plane. At the receiving position determines the angle in the horizontal planeequal to the difference between the azimuths goals and the selection position relative to the radar station at time tthe passage of the beam of the radar station between the target and the receiving positionwhere T is the period of rotation of the antenna.

Measure the difference between the distances radar - target - receiving position and radar - receiving position on the delay of the reflected signal relative to the direct. Using theorem of cosines to determine the range of targets R.

The disadvantage of this method lies in the fact that should be known coordinates of the station.

There is a method of determining the location of the radar, emitting radio pulses from a scanning antenna (Patent EPO 0342529, MKI 4 G 01 S 13/02, 13/87. The method of determining the location of the emitter signals).

First, in the receiving position memorize the coordinates of several within direct visibility of points on the ground. Then measure the time delay of signals reflected from these points, since the reception of the pulse radiated radar. On the basis of the measured time lags calculate the probable location of the radar station and the corresponding reflected signarama is what defines the location of the only targets with radar.

There is a method of determining the coordinates of targets using radar, emitting coded signals (Japan Patent 1-57312, MKI 4 G 01 S 13/46. Passive radar system. The application 06.10.81).

The source of the radio emits pulses using a scanning directional antenna. The pulses are encoded in accordance with the current angles of azimuth and location of the antenna. Reception position by using a directional antenna detects the azimuth of the detected target and decodes the angles of azimuth and location of the radiating antenna from the received reflected electromagnetic pulses. On the measured angles and the known location of the source of radio signals determine target coordinates.

The disadvantages of this method are the need for knowledge at the receiving position of the code used by the source radio, and its location.

The known method described in (Munich A., Schecker E. Bistatic System Passively Tracks Radar Targets. Microwaves & RF, 1991, 30, 9, p. 78-79, 82-83).

The essence of the method is that at the receiving position (PFP) measure the angleequal to the difference between the azimuths goals and PFP relative to the radar at the time of passage of the beam of the radar station between the target and the PFP, the angleStates(Radar - target - PFP and radar - PFP delay of the reflected signal relative to the direct signal, the desired horizontal distance equal:The disadvantage of this method of determining the distance is an error if the target, the radar and the reception position does not lie in the horizontal plane. For the case of terrestrial location of the radar station and the receiving position more than the height of the goal, the greater the measurement error range.

As the prototype is set to the method described in (Patent of Russia 2166199 from 27.04.2001, MKI 7 G 01 S 5/10, 3/02. The method of determining the horizontal range goals for emission scanning radar).

The method of determining the distance of the goal is that measure the difference between the azimuths PFP and objectives relative to the radar, the difference between the azimuth of the radar and the targets relative to the PFP, the difference between the distances radar - target - PFP and radar - PFP, as well as target position angleby using a directional antenna PFP, the horizontal range of the target is determined by the formula:wherethe difference between the azimuths PFP and objectives relative to the radar;the difference between the azimuth of the radar and the targets related to PFP;the difference Rastogi method of determining the distance is limited its use case ground location of the receiving position and the radar.

The technical result of the proposed method is widening its scope for arbitrary mutual arrangement radar and PFP.

The essence of the proposed method of determining the distance of the goal is one that measures the difference between the azimuths of PFP in the target relative to the radar, the difference between the azimuth of the radar and the targets relative to the PFP, the difference between the distances radar - target - PFP and radar - PFP target position angleand the elevation angle radarhorizontal range of the target is determined by the formula:

wherethe difference between the azimuths of the receiving position and the target relative to the radar;
the difference between the azimuth of the radar and the targets relative to the receiving position;
- difference radar - target - receiving position and radar - receiving position;
- target position angle relative to the receiving position;
the elevation angle of the radar relative to the receiving position.

The essence of the method is illustrated as follows. Let the origin of the coordinate system aligned with the PFP, the axis OS directed through the projection of a point location of the radar station on the horizontal plane, a Oz - straight up (with the>/img>andassociated with the coordinates of the radar and target as follows:





Expressthrough corners, and the searched horizontal range goal R:

Considering the positive direction of rotation clockwise, after transformations, we obtain the expression (3). In the particular case when the radar lies in the horizontal plane=0), we arrive at the formula (2).

In Fig. 2 presents a diagram of the device for the implementation of the proposed method. It consists of the main antenna 1, antenna 2 meter 3 meter 4, myCitadel 5, a computer 6. The method is implemented as follows. Highly directional beam of the main antenna 1 is directed at the target. Echo signals are received in the probe 3 and probe 4. The additional antenna 2 is directed to the emitting radar. Direct signals in the probe 3 and probe 4. In the measuring device 4 is determined by the difference between the distancesthe delay of the echo relative to the direct. In the 3 meter opredelaetsa direct pulses with known rotation period of the radar antenna, which can be measured in advance. In myCitadel 5 calculates the angleby finding the difference between the azimuths of the main antenna 1 and antenna 2. In the computer 6 receives the values of,,and the elevation angles of the goaland RLSfrom the main antenna 1. The transmitter is determined by the horizontal distance goal R by the formula (3).

Thus, this method allows you to measure the distance to the target when any mutual position of the radar and PFP by taking into account the elevation of the station. For example, it is possible to measure the range of terrestrial reception position on the radiation side scan radar, or Vice versa, to measure the range of onboard PFP radiation ground-based radar.


Claims

The method of determining the horizontal range goals for radiation scanning of the radar, which measures the difference between the azimuth of the receiving position and the target relative to the radar, the difference between the azimuth of the radar and the targets relative to the receiving position, the difference between the distances radar - target - receiving position and radar - receiving position, target position angledifferent horizontal range goals determined by the formula

wherethe difference between the azimuths of the receiving position and the target relative to the radar;

the difference between the azimuth of the radar and the targets relative to the receiving position;

t - difference radar - target - receiving position and radar - receiving position;

- target position angle relative to the receiving position;

the elevation angle of the radar relative to the receiving position.

 

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