CN107765211B - System for detecting intrusion signal of unknown broadcast television - Google Patents
System for detecting intrusion signal of unknown broadcast television Download PDFInfo
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- CN107765211B CN107765211B CN201710970119.5A CN201710970119A CN107765211B CN 107765211 B CN107765211 B CN 107765211B CN 201710970119 A CN201710970119 A CN 201710970119A CN 107765211 B CN107765211 B CN 107765211B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/04—Details
- G01S3/12—Means for determining sense of direction, e.g. by combining signals from directional antenna or goniometer search coil with those from non-directional antenna
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
- G01S19/45—Determining position by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement
- G01S19/46—Determining position by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement the supplementary measurement being of a radio-wave signal type
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0257—Hybrid positioning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/04—Position of source determined by a plurality of spaced direction-finders
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- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The invention relates to a system for detecting an intrusion signal of an unknown broadcast television, which comprises: the system comprises a plurality of handheld wireless signal receivers, a wireless communication network, a gateway processing center, an internet network and an information processing module, can quickly and simultaneously carry out direction finding and positioning on the intrusion signals of the broadcast television, finds unknown signal sources, is simple to operate, does not need professional knowledge for operators, and can complete measurement according to operation steps; the handheld wireless signal receiver is adopted, so that the size is small, the weight is light, and the condition that vehicles or large-scale equipment cannot arrive in time and cannot position the direction of an intrusion signal in a complex local environment is avoided; the system has a breakpoint continuous transmission function, and can keep tracking the angle information of the intrusion signal when the direction-finding tracking of the wireless signal receiver to the intrusion signal is lost due to short-time shielding or other reasons.
Description
Technical Field
The invention relates to a positioning technology, in particular to a system for detecting an intrusion signal of an unknown broadcast television.
Background
In recent years, with the rapid development of wireless communication services in China, the problem of relative shortage of radio spectrum resources is more and more prominent. The radio frequency spectrum is detected, the use order of electric waves is well maintained, radio frequency spectrum resources are fully utilized and protected, normal use of radio frequency by radio users is protected, illegal regulation is checked and treated, unknown signals are transmitted by illegal stations, and particularly, the illegal transmission of broadcast television signals becomes necessary requirements of radio management.
In the field of radio spectrum monitoring, direction-finding location techniques for wireless signals are divided into active location and passive location. Currently, a passive positioning technology is generally adopted in a radio monitoring system, and the position of a signal source is estimated by detecting some characteristic parameters of a propagation signal between the signal source and a plurality of monitoring stations.
In the prior art, such as japanese patents "azimuth detector (sho 64-78179)" and "angle measuring device (ping 2-141684)", the former designs a simple amplitude-contrast direction measurement method, that is, eight antennas spaced 45 ° apart are arranged in the same plane and connected to a receiver through a switch, and an omnidirectional antenna is also provided and separately connected to another receiver; the latter is a saturation loop which is added, and the defect of the saturation loop is that the saturation loop can only be used for fixing a monitoring station and only relates to direction finding. The integrated fixed or vehicle-mounted wireless monitoring and direction finding system formed by connecting a plurality of instruments and equipment can provide a mobile monitoring function, but the whole system has large volume, complex system, difficult maintenance and high manufacturing cost, the local environmental conditions to be monitored are different, and some environmental vehicles or large-scale equipment are not suitable for use, cannot arrive in time or even cannot arrive at all. At this time, it is impossible to provide direction finding and positioning for unknown wireless signals conveniently, timely, comprehensively and accurately to cope with possible events and provide enough information for emergency response and command. In addition, due to the limitation of use occasions and time, a fixed or vehicle-mounted monitoring system is difficult to comprehensively meet the requirements of early warning and monitoring.
Disclosure of Invention
In view of the above analysis, the present invention provides a system for detecting an intrusion signal of an unknown broadcast television, so as to overcome the above disadvantages of the existing direction-finding positioning technology, and provide a convenient, timely, comprehensive and accurate direction-finding positioning method for an unknown broadcast television signal.
The purpose of the invention is mainly realized by the following technical scheme:
a system for detecting an intrusion on an unknown broadcast television, comprising: the device comprises a handheld wireless signal receiver 1 and an information processing module 5, wherein the handheld wireless signal receiver 1 comprises a plurality of parts;
the handheld wireless signal receiver 1 receives an unknown broadcast television signal and a GPS/Beidou satellite signal, and transmits a data block including position information, an unknown broadcast television signal parameter and angle information of the handheld wireless signal receiver 1 to the information processing module 5 in a wireless mode;
the information processing module 5 receives and processes the data block, performs coordinate conversion on the receiver position information in the data block, and draws a ray from each receiver to an unknown broadcast television signal on an electronic map by taking the latest position information and angle information as references; calculating intersection point coordinates among rays drawn by all receivers; determining the coordinate value of the center point of the polygon according to the polygon formed by the intersection points; and the central point coordinate value is the transmitting place of the unknown broadcast television signal and is displayed on an electronic map.
Further, the handheld wireless receiver 1 comprises a direction-finding antenna 11, a stepping rotating motor 12, a radio-frequency signal real-time measuring device 13, a data storage device 14, a field intensity calculating device 15, an electronic compass 16, a GPS/Beidou positioning device 17 and a wireless communication device 18;
the direction-finding antenna 11 is used for receiving an unknown broadcast television signal;
the stepping rotating motor 12 is connected with the direction-finding antenna 11 and is used for driving the direction-finding antenna 11 to rotate within a range of 360 degrees;
the radio frequency signal real-time measuring device 13 is connected with the direction-finding antenna 11 and is used for measuring field intensity data of the video signal received by the direction-finding antenna 11;
the data storage device 14 is connected with the real-time measuring device 13, buffers and stores the signal field intensity data measured by the real-time measuring device 13, and outputs the stored signal field intensity data to the field intensity calculating device 15;
the electronic compass 16 is connected with the stepping rotating motor 12 and used for measuring an included angle between the antenna pointing direction and the geographical north pole and outputting an angle value obtained by measurement to the field intensity calculating device 15;
the GPS/Beidou positioning device 17 comprises a GPS/Beidou antenna and a positioning resolving module and is used for carrying out satellite navigation positioning on the handheld wireless receiver 1, acquiring geographic position information at the current moment and outputting the geographic position information to the field intensity calculating device 15;
the field intensity calculating device 15 compares the stored field intensity data quickly, screens out the maximum field intensity value of the received signal in the process that the direction-finding antenna 11 rotates for 360 degrees, determines the maximum direction of the field intensity by combining the azimuth angle data given by the electronic compass 16, and packs the test point position information measured and output by the GPS/Beidou positioning device 17 together to form a measurement data block which is output to the wireless communication device 18;
the wireless communication device 18 transmits the measurement data block in a wireless manner.
Further, the field intensity calculation means 15 is set with a loss holding time; when the unknown signal received by the direction-finding antenna 11 is lost, the field intensity calculating device 15 cannot determine the maximum field intensity direction; the field intensity calculating device 15 continues to output the measured data block according to the angle information at the lost moment until the direction-finding antenna 11 receives the unknown signal again; if the loss time exceeds the holding time, the field intensity calculating device 15 considers that the signal is lost and stops outputting the measurement data block.
Further, the loss hold time is 60 seconds.
Further, the direction-finding antenna 11 is a VHF/UHF antenna operating in the meter-wave and decimeter-wave broadcast television bands.
Further, the angle value measured by the electronic compass 16 is calculated by clockwise rotation in a unit of degree according to the true north of 0 degree, and the range is 0-360 degrees.
Further, the data structure of the measurement data block comprises:
the handheld wireless receiver encodes information, and the code corresponds to the handheld wireless receiver and is unique;
the angle information is an angle value of the maximum direction of the measured field intensity;
position information, which is a geographical coordinate (x) measured by the positioning deviced,yd)；
Signal characteristic information, the signal characteristic comprising a frequency value and a signal level value of an unknown signal;
measuring time information including a date and time of measurement;
data numbering information, which is information formed by numbering the data measured each time;
and the check code information comprises a data block word length and a parity check code.
Further, the wireless communication device 18 sends the data blocks in the form of GSM/GPRS/CDMA TCP/IP packets or short messages.
Further, a forwarding device is included, by which the measurement data block of the handheld wireless signal receiver 1 is sent to the information processing module 5.
Further, the forwarding device comprises a wireless communication network 2, a gateway processing center 3 and an internet network 4, wherein the wireless communication network 2 reports the measurement data block of the handheld wireless signal receiver 1 to the gateway processing center 3; the gateway processing center 3 sends the measurement data block to the information processing module 5 through the internet network 4.
The invention has the following beneficial effects:
the method can quickly and simultaneously carry out direction finding and positioning on the intrusion signals of the broadcast television, find unknown signal sources, is simple to operate, does not need professional knowledge for operating personnel, and can finish the measurement work according to the operation steps;
the handheld wireless signal receiver is adopted, so that the size is small, the weight is light, and the condition that vehicles or large-scale equipment cannot arrive in time and cannot position the direction of an intrusion signal in a complex local environment is avoided;
networking a plurality of wireless signal receivers, distinguishing different measuring points through the codes of the wireless signal receivers, and carrying out direction finding on an intrusion signal to realize quick positioning of the intrusion signal;
the unknown signal source is distinguished and determined according to the frequency value and the signal level value, so that the interference of other signal sources is avoided;
the data measurement time is judged according to the date, the time and the message number, and the measurement data at the same time is used for positioning calculation, so that the positioning precision is improved;
the system has a breakpoint continuous transmission function, and can keep tracking the angle information of the intrusion signal when the direction-finding tracking of the wireless signal receiver to the intrusion signal is lost due to short-time shielding or other reasons.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic block diagram of a handheld wireless receiver of the present invention;
fig. 3 is a flow chart of a positioning method of the positioning device.
Fig. 4 is a schematic diagram of the overall structure of the passive positioning device.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention.
In an embodiment of the present invention, a system for detecting intrusion of an unknown broadcast television is disclosed, as shown in fig. 1, including: the wireless signal receiver comprises a plurality of handheld wireless signal receivers 1, a wireless communication network 2, a gateway processing center 3, an information processing module 5 and an internet network 4 connected with the gateway processing center 3 and the information processing module 5.
As shown in fig. 2, the handheld wireless receiver 1 includes a direction-finding antenna 11, a stepping rotating motor 12, a radio frequency signal real-time measuring device 13, a data storage device 14, a field intensity calculating device 15, an electronic compass 16, a GPS/beidou positioning device 17 and a wireless communication device 18;
the direction-finding antenna 11 is used for receiving an unknown broadcast television signal, is a pair of receiving antennas with strong directivity, and adopts a VHF/UHF antenna working in a meter wave and decimeter wave broadcast television frequency band;
the stepping rotating motor 12 is connected with the direction-finding antenna 11 and is used for driving the direction-finding antenna 11 to rotate within a range of 360 degrees;
the radio frequency signal real-time measuring device 13 is connected with the direction-finding antenna 11 and is used for measuring field intensity data of the video signal received by the direction-finding antenna 11;
the data storage device 14 is connected with the real-time measuring device 13, buffers and stores the signal field intensity data measured by the real-time measuring device 13, and outputs the stored signal field intensity data to the field intensity calculating device 15;
the electronic compass 16 is an angle measuring module, is connected with the stepping rotating motor 12, and is used for measuring an included angle between the antenna pointing direction and the geographic north pole, and outputting a measured angle value to the field intensity calculating device 15, wherein the measured angle value is calculated by clockwise rotation in a range of 0-360 degrees according to the true north as 0 degree by taking the degree as a unit;
the GPS/Beidou positioning device 17 comprises a GPS/Beidou antenna and a positioning resolving module and is used for carrying out satellite navigation positioning on the handheld wireless receiver 1, acquiring geographic position information at the current moment and outputting the geographic position information to the field intensity calculating device 15;
the field intensity calculating device 15 compares the stored field intensity data quickly, screens out the maximum field intensity value of the received signal in the process that the direction-finding antenna 11 rotates for 360 degrees, determines the maximum direction of the field intensity by combining the azimuth angle data given by the electronic compass 16, and packs the test point position information measured and output by the GPS/Beidou positioning device 17 together to form a measurement data block which is output to the wireless communication device 18.
When the unknown signals received by the direction-finding antenna 11 are lost due to shielding or other reasons, the field intensity calculating device 15 cannot determine the maximum direction of the field intensity; the field intensity calculating device 15 continues to output the measured data block according to the set loss holding time and the angle information at the loss moment until the direction-finding antenna 11 receives the unknown signal again; if the loss time exceeds the holding time, the field intensity calculating device 15 considers that the signal is lost and stops outputting the measurement data block until an unknown signal is received again; the loss holding time may be set according to an application scenario, and in this embodiment, the loss holding time is set to 60 seconds.
The data structure of the measurement data block comprises:
the handheld wireless receiver encodes information, and the code corresponds to the handheld wireless receiver and is unique;
the angle information is an angle value of the maximum direction of the measured field intensity;
position information, which is a geographical coordinate (x) measured by the positioning deviced,yd)；
Signal characteristic information, the signal characteristic comprising a frequency value and a signal level value of an unknown signal;
measuring time information including a date and time of measurement;
data numbering information, which is information formed by numbering the data measured each time;
and the check code information comprises a data block word length and a parity check code.
The wireless communication device 18 uses GSM/GPRS/CDMA to report the measurement data block to the gateway processing center 3 of the system through the wireless communication network 2 in the form of TCP/IP data packet or short message.
And the gateway processing center 3 sends the measurement data block to an information processing module 5 through the internet network 4.
The information processing module 5 is embedded with a geographic information system platform and is used for processing direction-finding information and geographic position information sent by a plurality of the handheld wireless receivers 1 and displaying an analysis result on an electronic map.
During measurement, a plurality of measuring personnel carry the handheld wireless receiver 1 to carry out direction-finding positioning on unknown wireless signals at different places, and each measuring personnel continuously carries out measurement positioning at different geographic positions in the process of approaching a wireless signal transmitting target and sends the wireless signals to the information processing module 5. The information processing module 5 distinguishes different wireless receivers according to receiver coding information in the information sent by each handheld wireless receiver, converts the geographic position coordinates in the information sent by each wireless receiver into coordinate system coordinate values corresponding to an electronic map, and determines the latest information sent by each receiver according to the measurement time information and the data number information; drawing a ray on the electronic map according to the position information and the angle information sent by each receiver; calculating intersection point coordinates among rays drawn by all receivers; and determining the coordinate value of the central point of the polygon according to the polygon formed by the intersection points, wherein the coordinate value of the central point is the required emission place of the unknown signal, and the coordinate value of the central point is displayed on the electronic map.
As shown in fig. 3, a method for combined multi-point coordinated direction finding of an unknown broadcast television intrusion signal includes the following steps:
step S1, the plurality of handheld wireless receivers monitor the field intensity of the unknown broadcast television intrusion signal at different places to obtain the data block information of each place, and the data block information is sent to the information processing module; the data block information comprises time information and geographic coordinates of the handheld wireless signal receiver, characteristic values of an unknown broadcast television intrusion signal and angle values corresponding to maximum field intensity values.
The format of the data block is defined according to practical application, and the format of this embodiment is defined as: unique code of handheld wireless receiver, angle value corresponding to maximum field intensity value and geographic coordinate xdGeographic coordinate ydFrequency, level, date, time, message number and check code.
The element values in the defined format are sequentially arranged and separated by spaces, and the spaces are sequentially removed during decoding to obtain data required during data analysis. Any other message format that can be wirelessly transmitted and received may be in the format of the cover included in the present invention.
When the handheld wireless receiver cannot determine the maximum direction of the field intensity due to shielding or other reasons, the handheld wireless receiver continues to output the measurement data block according to the set loss holding time and the angle information of the loss moment until the handheld wireless receiver receives the unknown signal again; if the loss time exceeds the holding time, the handheld wireless receiver stops outputting the measurement data block until an unknown signal is received again; the loss holding time may be set according to an application scenario, and in this embodiment, the loss holding time is set to 60 seconds.
And step S2, the information processing module receives and preprocesses the data block.
The information processing module 5 receives data blocks containing wireless direction finding messages sent by the plurality of handheld wireless receivers 1, and performs preprocessing including judging the format of the received messages, decoding the messages, and performing coordinate conversion. As shown in fig. 4, the method specifically includes the following sub-steps:
step S200, information monitoring and receiving
In this step, the information processing module 5 monitors whether there is a message sent from the gateway processing center 3 in real time, and if so, the information processing module 5 receives a data block containing a wireless direction finding message sent from the handheld wireless receiver 1 through the wireless network 2 and the gateway processing center 3 in real time; if not, the monitoring is continued.
Step S201, detecting data block information through check code
The check code comprises an information word length and a parity check code, the information processing module 5 judges the format of the information by judging the information word length and the parity check of the information in the received data block, and if the information word length and the parity check meet the requirement, the information processing module decodes the information; and if the requirement is not met, re-receiving.
Step S202, data decoding is carried out according to the defined format
Decoding according to a defined message format, and sequentially removing spaces and check codes during decoding to obtain data required during data analysis: unique code, angle value and geographic coordinate x of handheld wireless receiverdGeographic coordinate ydFrequency, level, date, time and message number.
Step S203, coordinate conversion is carried out
Judging whether the coordinate conversion is needed, if so, according to the coordinate system adopted by the electronic map, the geographic position coordinate (x) contained in the received message is processedd,yd) And (5) performing coordinate conversion, and directly entering the next step if not needed.
For example, when positioning is performed by using GPS system, the received message is wrappedContaining geographical location coordinates (x)d,yd) The geographic position coordinate (x) of the WGS84 coordinate system in the message is converted into the geographic position coordinate (x) of the Beijing 54 coordinate system adopted by the electronic map and is used as the WGS84 coordinate systemd,yd) Converting into coordinate value (x) of Beijing 54 coordinate system corresponding to electronic mapt,yt)。
And step S204, adding the received data to a data storage queue.
And step S3, drawing rays on the electronic map according to the time information, the geographic coordinates and the angle value corresponding to the maximum field strength value of each handheld wireless receiver.
The information processing module 5 judges the number of the receivers in the message queue according to the unique code of the handheld wireless receiver contained in the data, and the number is determined according to the time information and the geographic coordinate (x)t,yt) And the angle value draws a ray on the map. The method comprises the following steps:
s301, acquiring a geographical coordinate measured by the wireless receiver and an angle value corresponding to the maximum field intensity value, distinguishing different wireless receivers and judging whether the data are latest and are at the same time point; latest, go to step S302; otherwise, the data is discarded.
The latest radio signal direction finding and positioning information transmitted from each handheld radio receiver 1 is acquired from the message queue. And distinguishing different wireless receivers according to codes in the message queue, and judging whether the message is latest and is at the same time point according to the time information and the number information.
Step S302, drawing rays on an electronic map according to the geographic coordinates of the handheld wireless receiver and the angle value corresponding to the maximum field intensity value; and drawing the corresponding rays of all the handheld wireless receivers participating in monitoring.
With the determined geographical coordinates (x) of the radio receiver in the message that is up-to-date and at the same point in timet,yt) And (4) taking the north as 0 degree according to the angle value in the latest message, rotating clockwise for calculation, and drawing a ray on the electronic map.
And drawing rays on a map for all the handheld wireless receivers participating in monitoring according to the codes of the handheld wireless receivers, and drawing direction rays of the positions of the wireless intrusion signals measured by the handheld wireless receivers at different geographic positions.
And step S4, calculating the intersection point coordinates among the rays drawn by all the receivers.
The rays drawn at all receivers are optionally two rays i and j, the coordinates of the points on the ray i satisfying the formula y-k [ i ═ i]×(x-x[i])+y[i]Said (x [ i ]]，y[i]) Coordinates on the electronic map of a handheld wireless receiver drawing a ray i for the current moment, k [ i [ ] i ]]Is the angle value measured by the handheld wireless receiver; the coordinates of the points on the ray j satisfy the formula y ═ k [ j ═ j]×(x-x[j])+y[j]Said (x [ j)]，y[j]) Coordinates on an electronic map of a handheld wireless receiver drawing a ray j for a current time, k [ j ]]Is the angle value measured by the handheld wireless receiver; the coordinates at the intersection of the two lines satisfy the formula: k [ j ]]×(x-x[j])+y[j]＝k[i]×(x-x[i])+y[i]The x-axis coordinates of rays i and j are obtained by transforming the formula
The y-axis coordinates of the rays i and j are divided into two cases, and when the angle value of the ray i is a multiple of 90 degrees, the y-axis coordinate y of the intersection point is k [ j]×(x-x[j])+y[j]Otherwise: the y-axis coordinate y of the intersection is k i]×(x-x[i])+y[i]；
Traversing the rays drawn by all the wireless receivers at the same time point, solving the coordinates of all the cross points according to the calculation method, and storing the coordinate data into arrays Ex and Ey, wherein the length of the array is N, and N is the number of the cross points.
And step S5, determining the coordinate value of the center point of the polygon formed by the intersection point coordinates.
Calculating the coordinate value of the center point of a polygon formed by the intersection points, wherein the step calculates the coordinate value of the center point (X, Y) according to the following formula:
where N is the number of intersections, Ex [ i ]]The x-axis coordinate value of intersection point i, Ey [ i ]]The y-axis coordinate value of the intersection point i. The center point coordinateThe value is the desired location of the wireless transmission source.
And step S6, identifying the center point on the electronic map.
And displaying the calculated central point coordinate values (X, Y) on the electronic map. In the whole wireless signal direction-finding positioning process, direction-finding personnel can send signals to the information processing module 5 through the handheld wireless receiver 1 at different geographic positions, and the information processing module 5 can continuously judge the position of the central point according to sent messages so as to more accurately position the position of a wireless emission source.
In the embodiment, the information processing module 5 is developed based on a MAPGIS platform, but the method is also suitable for other GIS platforms. The coordinate system of the map used in the system may be a coordinate system such as WGS84, beijing 54, and sienna 80, or may be a custom coordinate system.
In summary, the system for detecting an unknown broadcast television intrusion signal provided by the embodiment of the invention can rapidly and simultaneously perform direction finding and positioning on the broadcast television intrusion signal, find an unknown signal source, is simple to operate, does not need professional knowledge for an operator, and can complete measurement according to operation steps;
the handheld wireless signal receiver is adopted, so that the size is small, the weight is light, and the condition that vehicles or large-scale equipment cannot arrive in time and cannot position the direction of an intrusion signal in a complex local environment is avoided;
networking a plurality of wireless signal receivers, distinguishing different measuring points through the codes of the wireless signal receivers, and carrying out direction finding on an intrusion signal to realize quick positioning of the intrusion signal;
the unknown signal source is distinguished and determined according to the frequency value and the signal level value, so that the interference of other signal sources is avoided;
the data measurement time is judged according to the date, the time and the message number, and the measurement data at the same time is used for positioning calculation, so that the positioning precision is improved;
the system has a breakpoint continuous transmission function, and can keep tracking the angle information of the intrusion signal when the direction-finding tracking of the wireless signal receiver to the intrusion signal is lost due to short-time shielding or other reasons.
Those skilled in the art will appreciate that all or part of the flow of the method implementing the above embodiments may be implemented by a computer program, which is stored in a computer readable storage medium, to instruct related hardware. The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (1)
1. A system for detecting intrusion on a broadcast television signal, comprising: the system comprises a handheld wireless signal receiver and an information processing module, wherein the handheld wireless signal receiver comprises a plurality of parts;
the handheld wireless signal receiver receives an unknown broadcast television intrusion signal and a GPS/Beidou satellite signal, and transmits a data block comprising position information, an unknown broadcast television intrusion signal parameter and angle information of the handheld wireless signal receiver to the information processing module in a wireless mode;
the information processing module receives and processes the data block, performs coordinate conversion on the receiver position information in the data block, and draws a ray from each receiver to an unknown broadcast television intrusion signal on an electronic map by taking the latest position information and angle information as references; calculating coordinates of cross points among rays drawn by all the receivers; determining the coordinate value of the center point of the polygon according to the polygon formed by the intersection points; the central point coordinate value is the position of the unknown television intrusion signal, and the central point coordinate value is displayed on an electronic map;
the handheld wireless signal receiver comprises a direction-finding antenna, a stepping rotating motor, a radio-frequency signal real-time measuring device, a data storage device, a field intensity calculating device, an electronic compass, a GPS/Beidou positioning device and a wireless communication device;
the direction-finding antenna is used for receiving an unknown broadcast television intrusion signal;
the stepping rotating motor is connected with the direction-finding antenna and is used for driving the direction-finding antenna to rotate within a range of 360 degrees;
the radio frequency signal real-time measuring device is connected with the direction-finding antenna and is used for measuring field intensity data of the video signal received by the direction-finding antenna;
the data storage device is connected with the real-time measuring device, buffers and stores the signal field intensity data measured by the real-time measuring device, and outputs the stored signal field intensity data to the field intensity calculating device;
the electronic compass is connected with the stepping rotating motor and used for measuring an included angle between the direction of the antenna and the geographic north pole and outputting an angle value obtained by measurement to the field intensity calculating device;
the GPS/Beidou positioning device comprises a GPS/Beidou antenna and a positioning resolving module and is used for carrying out satellite navigation positioning on the handheld wireless signal receiver, acquiring geographic position information at the current moment and outputting the geographic position information to the field intensity calculating device;
the field intensity calculating device rapidly compares the stored field intensity data, screens out the maximum field intensity value of a received signal in the process that the direction-finding antenna rotates for 360 degrees, determines the maximum direction of the field intensity by combining azimuth angle data given by the electronic compass, and simultaneously packages the position information of the test points measured and output by the GPS/Beidou positioning device together to form a measurement data block which is output to the wireless communication device;
the wireless communication device sends out the measured data block in a wireless mode;
the data structure of the measurement data block comprises:
the handheld wireless signal receiver encodes information, the encoded information corresponds to the handheld wireless signal receiver, and the code is unique;
the angle information is an angle value of the maximum direction of the measured field intensity;
position information, which is a geographical coordinate (x) measured by the positioning deviced,yd)；
Signal characteristic information including a frequency value and a signal level value of an unknown broadcast television intrusion signal;
measuring time information, wherein the measuring time information comprises a measuring date and a measuring time;
data numbering information, which is information formed by numbering the data measured each time;
check code information including a data block word length and a parity check code;
during measurement, a plurality of measuring personnel carry the handheld wireless signal receiver to monitor the field intensity of an unknown broadcast television intrusion signal at different places to obtain a measurement data block of each place, and the measurement data block is sent to the information processing module;
the information processing module receives the measured data block sent by the plurality of handheld wireless signal receivers, judges the number of the receivers in the message queue according to the unique code of the handheld wireless signal receiver contained in the data block, and judges the number of the receivers according to the time information and the geographic coordinate (x)d,yd) And the angle value draws a ray on the map; the method comprises the following steps:
step S301, obtaining geographic coordinates (x) measured by the handheld wireless signal receiverd,yd) Distinguishing different handheld wireless signal receivers according to the angle value corresponding to the maximum field intensity value, and judging whether the data is latest and at the same time point; if yes, go to step S302; otherwise, discarding the data;
obtaining the latest wireless signal direction finding and positioning information transmitted by each handheld wireless signal receiver from the message queue; distinguishing different handheld wireless signal receivers according to codes in the message queue, and judging whether the message is latest and is at the same time point according to the time information and the number information;
step S302, according to the geographic coordinates (x) of the handheld wireless signal receiverd,yd) Angle values corresponding to the maximum field strength values, electronicallyRays are drawn on the graph; until all the rays corresponding to the handheld wireless signal receivers participating in monitoring are drawn completely;
to determine the geographic coordinates (x) of the handheld radio signal receiver in the message that is up-to-date and at the same point in timed,yd) Taking the north as 0 degree according to the angle value in the latest message as the origin, clockwise rotating and calculating, and drawing a ray on the electronic map;
drawing rays on a map for all handheld wireless signal receivers participating in monitoring according to codes of the handheld wireless signal receivers, and drawing direction rays of wireless intrusion signal positions measured by the handheld wireless signal receivers at different geographic positions;
the rays drawn at all receivers are optionally two rays i and j, the coordinates of the points on the ray i satisfying the formula y-k [ i ═ i]×(x-x[i])+y[i]Said x [ i ]]，y[i]Coordinates on an electronic map of a handheld wireless signal receiver for drawing a ray i for a current moment, k [ i [ ] i [ i ] ]]Is the tangent of the angle measured by the handheld wireless signal receiver; the coordinates of the points on the ray j satisfy the formula y ═ k [ j ═ j]×(x-x[j])+y[j]Said x [ j ]]，y[j]Coordinates on an electronic map of a handheld wireless signal receiver for drawing a ray j for a current time, k [ j ]]Is the tangent of the angle measured by the handheld wireless signal receiver; the coordinates at the intersection of the two lines satisfy the formula: k [ j ]]×(x-x[j])+y[j]＝k[i]×(x-x[i])+y[i]The x-axis coordinates of rays i and j are obtained by transforming the formula
The y-axis coordinates of the rays i and j are divided into two cases, and when the angle value of the ray i is a multiple of 90 degrees, the y-axis coordinate y of the intersection point is k [ j [ ]]×(x-x[j])+y[j]Otherwise: the y-axis coordinate y of the intersection is k i]×(x-x[i])+y[i]；
Traversing the same time point, obtaining the coordinates of all cross points by rays drawn by all the handheld wireless signal receivers according to the calculation method, and storing the coordinate data into arrays Ex and Ey, wherein the length of the array is N, and N is the number of the cross points;
calculating the polygon formed by the intersection pointsAnd (3) calculating the coordinate value of the center point of the shape according to the following formula:
where N is the number of intersections, Ex [ i ]]The x-axis coordinate value of the intersection point i, Ey [ i ]]Y-axis coordinate value for intersection i; the coordinate value of the central point is the position of the unknown broadcast television intrusion signal;
the field intensity calculating device is set with loss holding time; when the intrusion signal of the unknown broadcast television received by the direction-finding antenna is lost, the field intensity calculating device cannot determine the maximum field intensity direction; the field intensity calculating device continues to output the measured data block according to the angle information at the loss moment until the direction-finding antenna receives the intrusion signal of the unknown broadcast television again; if the loss time exceeds the retention time, the field intensity calculating device considers that the signal is lost and stops outputting the measurement data block;
the loss hold time is 60 seconds;
the direction-finding antenna is a VHF/UHF antenna working at the frequency bands of meter-wave and decimeter-wave broadcast television;
the angle value measured by the electronic compass is calculated by clockwise rotation in a unit of degree according to the true north of 0 degree, and the range is 0-360 degrees;
the wireless communication device sends data blocks in the form of GSM/GPRS/CDMA TCP/IP data packets or short messages;
the handheld wireless signal receiver comprises an information processing module, a transmitting device and a receiving device, wherein the information processing module is used for receiving measurement data blocks of the handheld wireless signal receiver;
the forwarding equipment comprises a wireless communication network, a gateway processing center and an internet network, wherein the wireless communication network reports the measurement data block of the handheld wireless signal receiver to the gateway processing center; and the gateway processing center sends the measurement data block to the information processing module through the internet network.
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