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

 

(57) Abstract:

The invention relates to radar. The scope of the invention can be ground radar mode passive detection and measurement of coordinates of the non-emitting targets. The technical result is an increase in accuracy of measuring the distance vsevyshnii air targets. The invention consists in that the height of the goal, in addition to the angle-scanning radar, the angle at the receiving position and the time delay of the reflected signal relative to the direct, additionally measured target position angle relative to the receiving position. 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 essence of the method consists in the following. The radar station with known coordinates carries a circular scanning a narrow beam in the horizontal plane. At the receiving position definition is the time tthe passage of the beam of the radar station between the target and the receiving position:

< / BR>
where 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 N 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 signals. The reflected signals are compared with stored data points on the ground.

The disadvantage of this method is that defines the location of the only targets with radar.

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 disadvantage of this method is the necessity of knowledge at the receiving position of the code used by the source radio, and its location.

As the prototype is set to the method described in (Munich A., Schecker E. Bistatic System Passively Tracks Radar Targets. Microwaves &RF. - 1991. - 30, N 9, P. 78-79, 82-83).

The essence of the method is that at the receiving position (PFP) measure the angle , equal to the difference of 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 PFP, angle , equal to the difference between the azimuth of the radar and the targets related to PFP using a directional antenna PFP and the difference between the distances radar - target - PFP and radar - PFP delay of the reflected signal Rel is of range-finding is the occurrence of errors in the event that 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.

The technical result of the proposed method is to improve the accuracy of measuring the distance vsevyshnii air targets.

The essence of the proposed 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 angle by using a directional antenna PFP, the horizontal range of the target is determined by the formula:

(2)

where the 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;

- difference radar - target - PFP and radar - PFP;

- target position angle relative to the PFP.

The essence of the method is illustrated by the following reasoning. Let the origin of the coordinate system aligned with the PFP, the OY axis directed through the radar, a OZ - straight up (Fig. 1). The values , , and are related to the coordinates of the radar and target as follows:

< / BR>
< / BR>
< / BR>
< / BR>
Express through the corners and sought-after transformations, we obtain the expression (2). In the particular case when the target lies in a horizontal plane = 0), we arrive at the formula (1).

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 and the 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 in the delay of the echo relative to the direct. In the measuring device 3 is determined by the time interval between the moment of reception packs of echoes and the tutus direct pulses with known rotation period of the radar antenna, which can be measured in advance. In myCitadel 5 angle is calculated by finding the difference between the azimuths of the main antenna 1 and antenna 2. In the computer 6 receives values, , ,, and target position angle from the main antenna 1. The transmitter is determined by the horizontal distance goal R by the formula (2).

Thus, this method allows for more accurate the first cast out the radiation scanning radar, namely, that measure 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 distance difference STGS - target - receiving position and radar - receiving position, wherein the measured target position angle by using a directional antenna receiving position, the horizontal range of the target is determined by the formula

< / BR>
where the 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;

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

- target position angle relative to the receiving position.

 

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