An intrusion detection system for accurately locating buried cables

Abstract

The invention relates to a precisely positioned buried cable intrusion detection system, comprising: an induction cable group electrically connected to a detector host, the detector host being connected to a defense zone monitoring host via a power supply line and a communication line, the defense zone monitoring host controlling various alarm devices via the communication line, the induction cable group comprising an electromagnetic wave radiation leakage cable and an electromagnetic wave receiving cable; and also comprising an auxiliary positioning unit, the auxiliary positioning unit comprising: a plurality of radio frequency receivers arranged at equal intervals along the length direction of the electromagnetic wave receiving cable, and an FPGA signal processor, each radio frequency receiver being connected to a signal input port of the FPGA signal processor via a bus, and a signal output port of the FPGA signal processor being connected to the defense zone monitoring host; the system further improves the intrusion positioning accuracy by combining the auxiliary positioning unit with the setting of an original electromagnetic wave receiving cable alarm unit, helps to quickly and accurately determine the position of the intruder, and provides reliable guarantee for taking various subsequent processing measures in a timely manner.

Description

Technical Field

[0001] The invention relates to the technical field of perimeter intrusion detection systems, and in particular to an intrusion detection system for accurately locating buried cables. Background Art

[0002] Perimeter intrusion detection technology can effectively protect the guarded area and prevent crimes from happening. The guarded area involves important places such as prisons, military material warehouses, nuclear waste treatment sites, missile test sites, and customs control areas.

[0003] Currently, the commonly used perimeter intrusion detection technologies include the following: 1) Infrared counter-radiation system (Application of Optoelectronic Technology, Vol.28, p.1-4, 2013): Infrared counter-radiation system is usually composed of a transmitter and a receiver. After the light beam is focused, an invisible blockade line is formed between the transmitter and the receiver. When the intruder passes through the area, the infrared beam is blocked to trigger an alarm. 2) Pulse electronic fence (Computer Measurement and Control, Vol.20, p.2529-2531, 2012): The pulse electronic fence is composed of a pulse generator and a cable carrying pulse electricity at the front end. Its prevention principle is that the non-lethal high-voltage pulse generated by the front-end cable can effectively repel intruders and provide an alarm. 3) Video motion detector (IEEE Trans. Pattern Anal. Mach. Intell., Vol.19, p.780-785, 1997): The video motion detector electronically analyzes the images generated by the camera, and judges whether the picture has changed by comparing the differences between several frames of images, thereby judging whether there is an intruder breaking in. 4) Microwave radar electronic wall: The microwave radar electronic wall consists of a pair of radar transmitters and receivers. The two devices are installed at a certain distance, which is the warning area. The transmitter emits electromagnetic waves and the receiver receives them. If the electromagnetic waves received by the receiver change abnormally, it can be determined that an intruder has entered. 5) Sensor-based perimeter security equipment: including vibration sensor detectors (IEEE Photon. Technol. Lett., Vol. 27, p. 1349-1352, 2015), pressure sensor detectors (IEEE Photon. Technol. Lett., Vol. 13, p. 618-619, 2001), etc. This type of alarm method is that the intruder directly or indirectly touches the sensor to trigger the alarm.

[0004] The above-mentioned perimeter intrusion detection technology has two common defects: on the one hand, the detection equipment is usually exposed, which is easy to be deliberately avoided and maliciously destroyed by intruders, and has poor concealment; on the other hand, the detection equipment has poor adaptability to weather changes and terrain environment. Weather changes such as wind, rain, snow, fog, hail, day / night and complex and diverse terrain environments will cause serious interference to the detection equipment, resulting in false alarms and detection blind spots.

[0005] The leakage cable perimeter intrusion detection system (IEEE Trans. Antennas Propag., Vol. 59, p. 2396-2403, 2011) is a new type of perimeter intrusion detection technology that has been rapidly developed in recent years. This method uses a pair of leakage cables as the system's transceiver antennas to form an invisible electromagnetic field area between the two cables, and when a person or a large animal passes by, it triggers an alarm. The leakage cable perimeter intrusion detection system fundamentally solves the common defects of the above-mentioned other detection technologies: 1) Since the leakage cable is usually shallowly buried underground or embedded in the wall, it does not affect the surrounding environment or the appearance of the building, and the detection field is invisible, the intruder cannot feel the existence of the leakage cable and does not know the specific location, let alone bypass or destroy it, and it is extremely concealed; 2) The leakage cable is very flexible and can be laid freely and flexibly according to different terrains and warning areas. The shape and direction of the laying can be changed freely and flexibly to achieve full coverage detection without blind spots.

[0006] However, the positioning accuracy of the leaky cable perimeter intrusion detection technology still needs to be improved. At present, the positioning accuracy of the Perimitrax series of leaky cable intrusion detection systems of Senstar-Stellar Company in Israel can reach up to 1m, while the highest positioning accuracy of this technology in China can only reach 20m, which is a big difference. Further improvement of positioning accuracy will help to quickly and accurately determine the location of the intruder, providing reliable guarantee for timely taking various subsequent treatment measures. Summary of the invention

[0007] The technical problem to be solved by the present invention is to solve the problem of low positioning accuracy in the current leakage cable perimeter intrusion detection system.

[0008] The technical solution of the present invention is to provide a precise positioning buried cable intrusion detection system, including: an induction cable group electrically connected to a detector host, the detector host is connected to a defense zone monitoring host through a power supply line and a communication line, the defense zone monitoring host controls each alarm device through the communication line, the induction cable group includes an electromagnetic wave radiation leakage cable and an electromagnetic wave receiving cable; it also includes an auxiliary positioning unit, the auxiliary positioning unit includes: a plurality of radio frequency receivers arranged at equal intervals along the length direction of the electromagnetic wave receiving cable, and an FPGA signal processor, each radio frequency receiver is connected to a signal input port of the FPGA signal processor via a bus, and a signal output port of the FPGA signal processor is connected to the defense zone monitoring host.

[0009] The electromagnetic wave radiation leakage cable and the electromagnetic wave receiving cable are connected to the detector host through feeders respectively. The electromagnetic wave radiation leakage cable and the electromagnetic wave receiving cable are laid horizontally with a spacing of 1m-3m, and the optimal spacing is 1.5m.

[0010] In a preferred embodiment of the present invention, the radio frequency receiver includes an electromagnetic wave receiving module, a frequency selection circuit module, a filtering circuit module, and an amplification module connected in sequence, and also includes an analog-to-digital conversion module, which communicates with the FPGA signal processor via a bus. The analog-to-digital conversion module converts the amplified analog signal into a digital signal and transmits the digital signal to the FPGA signal processor.

[0011] In a preferred embodiment of the present invention, the FPGA signal processor includes a signal processing module and a switch output module. The signal processing module communicates with the analog-to-digital conversion module in each RF receiver via a bus, and the switch output module communicates data with the defense zone monitoring host.

[0012] The intrusion positioning method based on the accurate positioning buried cable intrusion detection system comprises the following steps:

[0013] S1: Preset the alarm threshold. According to the real-life intrusion test, the minimum fluctuation value of the electromagnetic wave measured by the RF receiver during the intrusion is obtained as the threshold. A program is compiled to output the alarm variable when the electromagnetic wave fluctuation value ≥ the threshold is detected, and the program is burned to the FPGA signal processor.

[0014] S2: Fuzzy alarm. When an intrusion occurs, the electromagnetic waves in the space around the electromagnetic wave radiation leakage cable change, which is detected by the electromagnetic wave receiving cable and breaks its electrical balance. The detector host outputs the alarm variable to the defense zone monitoring host.

[0015] S3: Auxiliary positioning: the changes in electromagnetic waves at the place where the intrusion occurs are sensed by a nearby radio frequency receiver, and the changes in the electromagnetic waves are converted into digital information and sent to the FPGA signal processor. The FPGA signal processor uses the signal processing module to analyze the digital information, and when it meets the program settings, it controls the switch output module to output alarm variables to the defense zone monitoring host.

[0016] S4: Output the intrusion location. The defense zone monitoring host outputs the intrusion location information according to the location of the radio frequency receiver that generates the electromagnetic wave changes in step S3.

[0017] In a preferred embodiment of the present invention, each radio frequency receiver has a unique identification code, and the digital information includes the identification code and the measured electromagnetic wave fluctuation value.

[0018] In a preferred embodiment of the present invention, the location information of each radio frequency receiver is preset in the defense zone monitoring host, and the location information corresponds to the identity identification code one by one.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) In the precise positioning buried cable intrusion detection system of the present invention, the auxiliary positioning unit is combined with the original electromagnetic wave receiving cable alarm unit to further improve the intrusion positioning accuracy, which helps to quickly and accurately determine the location of the intruder and provide reliable guarantee for timely taking various subsequent processing measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a topological diagram of the present invention. DETAILED DESCRIPTION

[0023] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] The technical solution of the present invention will be clearly and completely described below through specific implementation methods.

[0025] The present invention provides a kind of, its specific structure is as follows Figure 1 As shown,

[0026] In a preferred embodiment of the present invention, there is provided a precisely positioned buried cable intrusion detection system, comprising: an induction cable group electrically connected to a detector host 1, the detector host 1 being connected to a defense zone monitoring host 3 via a power supply line and a communication line, the defense zone monitoring host 3 controlling each alarm device via a communication line, the induction cable group comprising an electromagnetic wave radiation leakage cable 2 and an electromagnetic wave receiving cable 21; and also comprising an auxiliary positioning unit, the auxiliary positioning unit comprising: a plurality of radio frequency receivers 4 equally spaced along the length direction of the electromagnetic wave receiving cable 21, and an FPGA signal processor 5, each radio frequency receiver 4 being connected to a signal input port of the FPGA signal processor 5 via a bus, and a signal output port of the FPGA signal processor 5 being connected to the defense zone monitoring host 3.

[0027] The electromagnetic wave radiation leakage cable 2 and the electromagnetic wave receiving cable 21 are connected to the detector host 1 through feeders respectively. The electromagnetic wave radiation leakage cable 2 and the electromagnetic wave receiving cable 21 are laid horizontally with a spacing of 1m-3m, and the optimal spacing is 1.5m.

[0028] In a preferred embodiment of the present invention, the radio frequency receiver 4 includes an electromagnetic wave receiving module, a frequency selection circuit module, a filtering circuit module, and an amplification module connected in sequence, and also includes an analog-to-digital conversion module. The analog-to-digital conversion module communicates with the FPGA signal processor 5 via a bus. The analog-to-digital conversion module converts the amplified analog signal into a digital signal and transmits the digital signal to the FPGA signal processor 5.

[0029] In a preferred embodiment of the present invention, the FPGA signal processor 5 includes a signal processing module and a switch output module. The signal processing module communicates with the analog-to-digital conversion module in each RF receiver 4 via a bus, and the switch output module communicates data with the defense zone monitoring host 3.

[0030] The intrusion positioning method based on the accurate positioning buried cable intrusion detection system comprises the following steps:

[0031] S1: preset the alarm threshold, obtain the minimum fluctuation value of the electromagnetic wave measured by the radio frequency receiver 4 when the intrusion is carried out according to the real person intrusion test as the threshold, compile a program to output the alarm variable when the electromagnetic wave fluctuation value ≥ the threshold is detected, and burn the program to the FPGA signal processor 5.

[0032] S2: Fuzzy alarm. When an intrusion occurs, the electromagnetic waves in the space around the electromagnetic wave radiation leakage cable 2 change, which is detected by the electromagnetic wave receiving cable 21 and breaks its electrical balance. The detector host 1 outputs the alarm variable to the defense zone monitoring host 3.

[0033] S3: Auxiliary positioning. The changes in electromagnetic waves at the place where the intrusion occurs are sensed by the nearby radio frequency receiver 4, and the changes in the electromagnetic waves are converted into digital information and sent to the FPGA signal processor 5. The FPGA signal processor 5 uses the signal processing module to analyze the digital information. When it meets the program settings, it controls the switch output module to output alarm variables to the defense zone monitoring host 3.

[0034] S4: Output the intrusion position. The defense zone monitoring host 3 outputs the intrusion position information according to the position where the radio frequency receiver 4 that generates the electromagnetic wave change in step S3 is arranged.

[0035] In a preferred embodiment of the present invention, each radio frequency receiver 4 has a unique identification code, and the digital information includes the identification code and the measured electromagnetic wave fluctuation value.

[0036] In a preferred embodiment of the present invention, the location information of each radio frequency receiver 4 is preset in the defense zone monitoring host 3, and the location information corresponds to the identity identification code one by one.

[0037] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering technicians in the field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have been fully recorded in the technical requirements.

Claims

1. A system for accurately locating buried cable intrusion detection, comprising: An induction cable group electrically connected to a detector host, wherein the detector host is connected to a defense zone monitoring host via a power supply line and a communication line, and the defense zone monitoring host controls each alarm device via the communication line, and the induction cable group includes an electromagnetic wave radiation leakage cable and an electromagnetic wave receiving cable; it is characterized in that it also includes an auxiliary positioning unit, and the auxiliary positioning unit includes: a plurality of radio frequency receivers arranged at equal intervals along the length direction of the electromagnetic wave receiving cable, and an FPGA signal processor, each radio frequency receiver is connected to a signal input port of the FPGA signal processor via a bus, and a signal output port of the FPGA signal processor is connected to the defense zone monitoring host; the defense zone monitoring host is preset with location information of each radio frequency receiver, and the location information corresponds one-to-one to an identity recognition code.

2. According to the precise positioning buried cable intrusion detection system of claim 1, the radio frequency receiver comprises an electromagnetic wave receiving module, a frequency selection circuit module, a filtering circuit module, and an amplification module connected in sequence, characterized in that: It also includes an analog-to-digital conversion module, which communicates with the FPGA signal processor via a bus.

3. The precise positioning buried cable intrusion detection system according to claim 1 or 2, characterized in that: The FPGA signal processor includes a signal processing module and a switch output module. The signal processing module communicates with the analog-to-digital conversion module in each radio frequency receiver via a bus, and the switch output module communicates data with the defense zone monitoring host.

4. The intrusion location method of the accurate location buried cable intrusion detection system according to any one of claims 1, 2 or 3 is characterized in that: The following steps are involved: S1: preset the alarm threshold, obtain the minimum fluctuation value of the electromagnetic wave measured by the radio frequency receiver when the intrusion is carried out according to the real person intrusion test as the threshold, compile a program to output the alarm variable when the electromagnetic wave fluctuation value ≥ the threshold is detected, and burn the program to the FPGA signal processor; S2: Fuzzy alarm. When an intrusion occurs, the electromagnetic waves in the space around the electromagnetic wave radiation leakage cable change, which is detected by the electromagnetic wave receiving cable and breaks its electrical balance. The detector host outputs the alarm variable to the defense zone monitoring host. S3: Auxiliary positioning: the electromagnetic wave changes at the place where the intrusion occurs are sensed by the radio frequency receiver installed nearby, and the electromagnetic wave changes are converted into digital information and sent to the FPGA signal processor. The FPGA signal processor uses the signal processing module to analyze the digital information. When it meets the program setting, the switch output module is controlled to output the alarm variable to the defense zone monitoring host; S4: Output the intrusion location. The defense zone monitoring host outputs the intrusion location information according to the location of the radio frequency receiver that generates the electromagnetic wave changes in step S3.

5. The intrusion positioning method based on the accurate positioning buried cable intrusion detection system according to claim 4 is characterized in that: Each of the radio frequency receivers has a unique identification code, and the digital information includes the identification code and the measured electromagnetic wave fluctuation value.

6. The intrusion positioning method based on the accurate positioning buried cable intrusion detection system according to claim 4 is characterized in that: The defense zone monitoring host is preset with the location information of each radio frequency receiver, and the location information corresponds to the identity identification code one by one.

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