RU2133046C1 - Method of detection of intrusion of moving object into control zone - Google Patents

Abstract

FIELD: radar detection of position of intruder over entire area of controlled territory, at approaches to it over land, sea or air space. SUBSTANCE: proposed method can be employed to safeguard important strategic facilities, water intakes, storages and other objects. In agreement with this method radar surveillance and automatic detection of moving objects within limits of controlled zone with the use of radar detectors having wide radiation pattern and installed in correspondence with configuration of controlled zone in points providing for overlapping of observation sectors. Moving objects are detected within resolution limits of one of range channels simultaneously by several radar detectors from different points. Position of object is found by coordinates of area of crossing of equidistant zones of range channels of radar detectors where signal from moving object is detected. Final decision on intrusion into controlled zone is made if coordinates of position of intruder are found to be in controlled zone. EFFECT: enhanced operational reliability of method. 4 dwg

Description

 The invention relates to the field of radar detection, and in particular to methods for detecting unauthorized entry into a controlled area, and can be used to protect important strategic objects, water intakes, explosive and chemical storage facilities and other objects, ensuring the detection of an intruder over the entire area of the object, on approaches him on land, water and from airspace.

 A known method of detecting intrusion into a controlled area, implemented, for example, see the system "PION-1", Protection of perimeters IV Ivanov.- M .: Radio and communications, 1997, p. fourteen; Equipment "PION-T", technical description and user manual АВЯ1.400.005 ТО.

 The method is carried out using radar sensors with narrow radiation patterns installed along the perimeter and reacting to the intersection of the radar beam by the intruder.

 The disadvantages of this method are the inability to detect the penetration of the intruder through the air and insensitivity to the intruder located inside the controlled territory.

 Known radar Doppler detector that allows you to control the invasion of a moving intruder in a given volume or area, regardless of the penetration method used in security alarm devices, for example: Russian patent N 2033626, G 01 S 13/02, 1992.

 This device, which implements the known detection method, contains radar sensors with a wide radiation pattern, covering a certain volume (area) of the protected area, and does not allow to determine the coordinates of the location of the intruder, which limits its use only in closed rooms or in open areas of small size, enclosed by a gap At the same time, a large-sized target located outside the protected zone can lead to a false response of the device.

 A known method of detecting an invasion of a moving object in a controlled area, implemented in, see US patent N 5132690, G 01 S 13/00, 1992. In this method, a predetermined detection zone is probed with a narrow scanning beam using a phased antenna array (PAR), reception and the detection of echoes from the target is carried out at a certain distance from the transmitter by the receiving device of the radar station.

 However, the implementation of this method requires a complex expensive energy-intensive antenna system, with an arbitrary configuration of the protected area, an increase in the number of radars will be required, which will lead to a significant complication and cost of equipment, limiting the service life.

 A device is known for detecting intruders in a protected area (see patent GB N 2120491, G 01 S 13/56, op. 30.11.83), which allows for radar observation and detection of a moving object using radar sensors with wide radiation patterns with overlapping sectors of their review. However, this device does not solve the problem of measuring the distance to the target and determining its exact location within the observation area.

 The purpose and technical result of this invention is the detection of a moving object in a controlled area, on approaches to it by ground and air, without the use of complex antenna devices, while the controlled area can have an arbitrary configuration.

 This goal is achieved by the fact that in the method of detecting intrusion of moving objects in a controlled area, consisting in radar observation and automatic detection of a moving object within the controlled area, radar observation is carried out by radar sensors having wide radiation patterns and installed with overlapping sectors of their review, carry out multi-channel reception by the range of reflected signals and detection of a moving object within the resolution of one the range channel simultaneously with several radar sensors, determine the coordinates of the moving object from the coordinates of the intersection point of the equidistance of the zones of the range channels in which the moving object was detected, compare the obtained coordinates with the coordinate area of the controlled zone and judge by the results of the comparison about the invasion of the moving object in the controlled zone. The multi-channel reception of reflected signals in range consists in the fact that the distance in the range of each sensor is divided into zones corresponding to a separate range channel, the signal is detected separately in each range zone.

 In FIG. 1 shows a diagram for determining the location of a moving object (intruder) according to the claimed method using two orthogonally-oriented sensors.

Where:
1 - the first and second radar sensors;
2 - violator;
3 - guarded object;
4 - the area of intersection of the range zones (n-th first sensor and m-th for the second sensor, in which the intruder was detected).

 In FIG. 2 shows the relative position of the coordinate grid and the range zones of the sensors in which the detection occurred.

 In FIG. 3 presents a structural diagram of a device that implements the inventive method (for 3 radar sensors).

 In FIG. 4 is an example of a radar sensor.

 To implement the proposed method, radar sensors are installed in accordance with the configuration of the protected area, providing overlap of the viewing sectors.

The location of the intruder can be determined, for example, using the device of FIG. 3, where:
1 - radar sensors;
5 - read-only memory (ROM);
6 is a logical circuit that excludes OR;
7 is a comparison diagram;
8 - ROM of the coordinate area of the controlled zone (terrain map).

 The radar sensor (see Fig. 4) is a short-range Doppler microwave radar with continuous radiation, including two antennas: receiving 9 and transmitting 10, microwave generator 11 with broadband modulator 12, a multi-channel homodyne type correlation receiver, including a microwave mixer 13, the correlator 14, the coupler 15, the synchronizer 16 and the automatic detector of the Doppler signal 17.

The sounding and reception of the reflected signals are carried out in the entire angular sector of the review, due to the width of the radiation patterns of the antennas, constituting a value (60 ... 120 ^o ). The broadband output signal of the microwave generator 11 is fed to the input of the coupler 15, the output of which the signal without attenuation is fed to the input of the transmitting antenna 10 and attenuated to the required level is fed to the heterodyne input of the microwave mixer 13, the signal input of which is connected to the output of the receiving antenna 9. From the output mixer 13, the signal is fed to the input of the multi-channel correlator 14, where the inter-correlation function of the received signal is calculated with the reference signals of each range channel, formed by synchronizers 16. A the automatic detector 17 selects the Doppler signal present in any of the range channels. The sensor output is the detector output, the signal of which is a digital code for the range of the detected target.

 At the time of detection of the intruder, a digital code of the corresponding range zone appears at the output of sensor 1 (see Fig. 3).

 The generated code is fed to the address input of ROM 5. ROM 5 is programmed in such a way that when a range zone code is supplied to the address input, an array of coordinates appears in the physical space on the data bus (input). The coordinate grid step is selected so that at least one coordinate grid point gets into the element formed by the intersection of the range zones of different sensors (see Fig. 2).

 The outputs of the ROM 5 (data bus) are connected to the inputs of the EXCLUSIVE OR 6 logic circuit. At the output of the EXCLUSIVE OR logic circuit, an array of data corresponding to the space element intersects where the range of the sensors in which the target was detected intersects.

 Further, in the comparison scheme 7, the coordinates of the location of the intruder are compared with the coordinate area of the controlled zone (terrain map) programmed in ROM 8, and a decision is made on the intrusion of the violator into the controlled zone.

The application of the proposed method will allow:
- form the lines of protection of arbitrary configuration without carrying out engineering work on the device of these lines on the territory of the protected object;
- detect a moving intruder over the entire area of the controlled territory, having a complex configuration, on approaches to it by ground and air, without expensive scanning radars, while eliminating false alarms from moving objects located outside the controlled territory.

 Despite the wide antenna patterns, the proposed method allows you to accurately determine the location of the intruder. The error in determining the location depends on the width of the zones into which the sensor’s range scale is divided.

Claims (1)

 A method for detecting the intrusion of a moving object in a controlled area, which consists in radar observation by several sensors with wide radiation patterns installed with overlapping sectors of their review, characterized in that they carry out multi-channel reception of reflected signals, the detection of a moving object is carried out within the resolution of one range channel simultaneously several sensors determine the location of a moving object by the coordinates of the intersection of equidistant GOVERNMENTAL zones corresponding channels range in which detection of a moving object has occurred, the coordinates obtained compared with the area of controlled area and coordinates on the comparison decide the invasion of the moving object in the monitored zone.

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