CN110753302A - Path perception electronic fence system for back-and-forth monitoring of students - Google Patents
Path perception electronic fence system for back-and-forth monitoring of students Download PDFInfo
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- CN110753302A CN110753302A CN201910951909.8A CN201910951909A CN110753302A CN 110753302 A CN110753302 A CN 110753302A CN 201910951909 A CN201910951909 A CN 201910951909A CN 110753302 A CN110753302 A CN 110753302A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/021—Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/023—Services making use of location information using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/029—Location-based management or tracking services
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Abstract
The invention provides a path-aware electronic fence system for back-and-forth monitoring of students. The service platform comprises a server and a service staff, the positioning terminal is connected with the server through a communication network and reports monitoring information of the monitored student; the server sets a path-aware electronic fence containing the home, the institution and the round-trip path of the supervised student, including zone information, direction information and expected time-consuming information. The constant path is obtained based on the historical round trip track record of the monitored student. The server receives and analyzes the reported monitoring information, and when the conditions of border crossing, direction error or time abnormity occur, the server gives an alarm to service personnel. The path perception electronic fence system adds the monitoring conditions of time and direction, further improves the monitoring sensitivity, reduces the false alarm rate of the electronic fence system, does not need a guardian to monitor the monitored student in real time, and reduces the monitoring pressure.
Description
Technical Field
The invention relates to an electronic fence system, in particular to a path-aware electronic fence system for the back-and-forth monitoring of students.
Background
In social production and life, the needs of daily fixed-point round trip and two places, such as students participating in learning or training, are met, so that the students need to regularly round trip between families and institutions. For some students whose physical conditions are not suitable for independent reciprocation, such as underage children, mentally disabled persons, etc., the family of the student is required to be delivered every time, which greatly increases the burden of the family of the student. When some families cannot take the call every time, accidents of the students in the round trip can happen.
In order to solve the problems, in the prior art, a student wears a positioning terminal, the positioning terminal captures the position information of the terminal in various positioning modes, and then the data are transmitted back to a service platform through a network. The electronic fence and the dangerous area are arranged on the service platform, when the positioning terminal leaves the fence or approaches the dangerous area, an alarm is realized, and related personnel are informed in time. However, this technique has several problems:
firstly, in the specific arrangement mode of the electronic fence, in order to improve the alarm sensitivity, the electronic fence needs to be arranged to be smaller, but because the positioning always has a certain offset problem, a higher false alarm rate can be caused, meanwhile, the human advancing process is a path, and the arrangement of the fence can be very complicated (if a fence with a simple shape is arranged to include the whole path, the fence range is too large, and the alarm effect cannot be realized).
Secondly, in an actual service scene, a service staff needs to track the positions and paths of a plurality of students in real time until the monitored students arrive at a destination, so that the requirement on the service staff is high, and the problem cannot be found in time under the condition of multiple persons. Under the condition of real-time monitoring of family members, although only one person needs to be tracked, the occupation of the time of the family members is long.
Disclosure of Invention
The invention aims to provide a path perception electronic fence system for the back-and-forth monitoring of a student, which mainly solves the problems in the prior art, can reduce the false alarm rate of the electronic fence on the premise of keeping the monitoring effectiveness, does not need a service staff to monitor a monitored object in real time, and improves the monitoring efficiency. In order to achieve the above object, the technical solution adopted by the present invention is to provide a path-aware electronic fence system for trainee to-and-fro monitoring, which comprises a positioning terminal, a service platform and a communication network, and is characterized in that the service platform comprises a server and a service staff, the positioning terminal is connected with the server through the communication network, and reports monitoring information of the trainee to be monitored; the monitoring information comprises position information and time information;
the server sets a path-aware electronic fence; the path perception electronic fence is formed by combining a first position electronic fence arranged at a first position, a second position electronic fence arranged at a second position and a path electronic fence along the normal path to form an integral electronic fence, and comprises regional information; the path-aware electronic fence also includes the constant path, which is derived based on a trajectory record of historical round trips of the supervised student.
Further, the constant path includes path direction information and also includes time period information allowing the supervised student to make round trip;
when the monitored student leaves the first position electronic fence or the second position electronic fence, the positioning terminal reports the monitoring information every M seconds; at other moments, the positioning terminal reports the monitoring information every N minutes; the server receives and processes the monitoring information;
the communication network comprises Wi-Fi, Bluetooth, ZigBee, LoRa and cellular network communication technologies; the cellular network communication technology comprises 5G, 4G, 3G and 2G; the positioning mode used by the positioning terminal comprises satellite positioning, Wi-Fi positioning, Bluetooth positioning or base station positioning.
Further, the path-aware electronic fence formation includes:
step 101, decomposing the constant path into a plurality of continuous sub-paths;
step 102, expanding towards two sides by taking the sub-path as an axis to form a pipeline shape comprising the sub-path;
103, connecting the shapes of the pipelines end to end;
step 104, removing all the internal lines of the overlapped part and reserving the peripheral lines of the overlapped part to form the path electronic fence;
step 105, forming the first position electronic fence by taking the positioning point of the first position as a center;
step 106, forming the second position electronic fence by taking the positioning point of the second position as a center;
step 107, connecting the first position electronic fence and the path electronic fence in a manner that one end of the path electronic fence is placed on the center of the first position electronic fence;
step 108, removing the inner lines of the overlapped part of the first position electronic fence and the path electronic fence, and reserving the outer lines of the overlapped part;
step 109, connecting the second position electronic fence and the path electronic fence in a manner that one end of the path electronic fence is placed on the center of the second position electronic fence;
step 110, removing the inner lines of the overlapping part of the second position electronic fence and the path electronic fence, and reserving the outer lines of the overlapping part;
step 111, connecting all the reserved lines to form a closed area, and forming the area information of the path sensing electronic fence;
and 112, recording the path direction information of the constant path to form the direction information of the path perception electronic fence.
Further, the constant path is obtained by calculation based on one or more histories of the trainee and the track record; the track record contains the monitoring information; the generation of the constant path comprises the following steps:
step 201, selecting the positions of two positioning points adjacent in time from the track record according to the time information to form adjacent positioning points;
step 202, projecting the adjacent positioning points to a map;
step 203, eliminating unreasonable path selection on the map, and solving the shortest path between the adjacent positioning points to obtain a reasonable path;
step 204, repeating the steps 201 to 203 until all points in the track record are traversed to obtain one or more reasonable paths;
and step 205, sorting the time information, connecting all the reasonable paths, and recording the path direction information to form the constant path, wherein the direction of the reasonable path is recorded as the path direction information of the constant path.
Further, generating the track record comprises the steps of:
step 301, when the supervised student leaves the first location electronic fence or the second location electronic fence, or when a family member or an organization operates and the supervised student leaves the first location or the second location, starting generation of the track record;
step 302, the positioning terminal collects self information to obtain the monitoring information and reports the monitoring information to the server;
step 303, the server records the reported monitoring information, and separates the position information and the time information from the reported monitoring information to obtain the track record;
and 304, repeating the steps 302 to 303 until the trainee enters the first position electronic fence or the second position electronic fence, or when a family member or a mechanism operates and the trainee to be monitored reaches the first position or the second position, stopping the generation of the track record.
Further, the frequent path included in the path-aware electronic fence also includes expected time-consuming information; setting a plurality of specific positioning points in the path perception electronic fence; recording the expected time consumption information of the constant path by the monitored student along the direction specified in the direction information of the constant path, starting from the starting point and reaching each reasonable time consumption of the specific positioning point.
Further, the expected time-consuming information calculating step includes:
step 401, dividing the path-aware electronic fence into a plurality of small areas, wherein each small area comprises one specific positioning point;
step 402, obtaining the time consumed by the trainee from the starting point to each small area from the track record;
step 403, repeating step 402 for a plurality of track records to obtain a plurality of consumed time corresponding to each small region, and calculating an average value of all the consumed time;
step 404, taking the average value as the reasonable time consumption of the specific positioning point corresponding to the small region, and saving the reasonable time consumption as the expected time consumption information of the constant path.
Further, after receiving the monitoring information, the server processes the information according to the following steps:
step 501, the server compares the location information in the monitoring information with the area information of the path-aware electronic fence, and when finding that the location information exceeds the area information of the path-aware electronic fence, reports an abnormal condition to the service staff, and completes processing; otherwise, go to step 502;
step 502, the server compares the time information in the monitoring information with the time period information of the constant path corresponding to the path sensing electronic fence, and when the comparison result does not allow the monitored student to go out, step 503 is executed, otherwise step 504 is executed;
step 503, when the position information is found to exceed the area information contained in the first position electronic fence and the second position electronic fence, reporting an abnormal condition to the service staff, and completing the processing; otherwise, go to step 504;
step 504, when finding that the location information is in the area information included in the path electronic fence, the server calculates a moving direction of the positioning terminal according to a plurality of pieces of location information which are most recent in history, and when the moving direction does not conform to the direction information of the normal path corresponding to the path sensing electronic fence, reports an abnormal condition to the service staff, and completes processing; otherwise, the exception is not reported and the process is completed.
Further, after receiving the monitoring information, the server processes the information according to the following steps:
step 601, the server compares the location information in the monitoring information with the area information of the path-aware electronic fence, and when finding that the location information exceeds the area information of the path-aware electronic fence, reports an abnormal condition to the service staff, and completes processing; otherwise, go to step 602;
step 602, the server compares the time information in the monitoring information with the time period information of the constant path corresponding to the path sensing electronic fence, and when the comparison result does not allow the supervised student to go out, step 603 is entered, otherwise step 604 is entered;
step 603, when the position information is found to exceed the area information contained in the first position electronic fence and the second position electronic fence, reporting an abnormal condition to the service staff, and finishing the processing; otherwise, go to step 604;
step 604, when finding that the location information is in the area information included in the path electronic fence, the server calculates a moving direction of the positioning terminal according to a plurality of pieces of location information which are most recent in history, and when the moving direction does not accord with the direction information of the normal path corresponding to the path sensing electronic fence, reports an abnormal condition to the service staff, and completes processing; otherwise, go to step 605;
step 605, the server finds the specific positioning point which is closest to the position information but has not yet arrived, compares the expected time-consuming information corresponding to the specific positioning point with the time information in the monitored information, and reports an abnormal condition to the service staff when the time information in the monitored information is greater than the expected time-consuming information, and the processing is completed; otherwise, the exception is not reported and the process is completed.
Further, the step of comparing the area information by the server is as follows:
step 701a, obtaining position information in the monitoring information;
step 702a, judging whether the positioning point of the position information is in the range of the area information, and if the positioning point is not in the range, judging that the positioning point exceeds the area information;
the step of comparing the area information by the server may further be:
step 701b, obtaining position information in the monitoring information;
step 702b, expanding a shape range by taking the positioning point of the position information as a center;
and 703b, judging whether the shape range is overlapped with the center of the range of the area information or not, and if not, judging that the shape range is beyond the area information.
In view of the above technical features, the present invention has the following advantages:
1. the path perception electronic fence system sets relatively loose electronic fence areas near the home address and the mechanism address of the monitored student, thereby reducing the false alarm rate of the electronic fence system. In the positions, the activities of the students are directly attended by related personnel in real time, so that the danger probability is low, and meanwhile, the positions are generally indoor environments, the probability of positioning drift is high, and the false alarm is easily caused.
2. The path perception electronic fence system ensures that important monitoring is carried out during the independent round trip which needs monitoring most through learning the habitual round trip paths of the students and arranging relatively small fence areas on the regular paths. Because the frequent path is used as reference for comparison, the real-time monitoring of service personnel or family members is not needed, and the real-time processing is intervened when the alarm that the student deviates from the frequent path is received, so that the monitoring pressure is reduced.
3. The path perception electronic fence system adds time information and direction information in the setting of the electronic fence. Even if the student is always in the area of the electronic fence, if the traveling direction and the constant path do not accord with each other or the advancing speed and the historical records do not accord with each other seriously, an alarm can be triggered, and the monitoring reliability is further improved.
Drawings
FIG. 1 is a schematic diagram of a path-aware electronic fence according to the present invention;
FIG. 2 is a schematic diagram of the round trip path of the present invention;
FIG. 3 is a diagram of the original problem of the constant path generation in the present invention;
FIG. 4 is a schematic diagram of a normal path generation method according to the present invention;
FIG. 5 is a schematic diagram of path division during generation of an electronic fence according to the present invention;
FIG. 6 is a schematic diagram of the generation of sub-fence areas during the generation of electronic fences in the present invention;
FIG. 7 is a schematic diagram of the sub-fence areas being spliced into a complete electronic fence according to the present invention when the electronic fence is generated;
fig. 8 is a schematic diagram of the generation of time information when the electronic fence is generated according to the present invention.
In the figure: 1-home, 2-mechanism, 3-travel path, 4-location point, 5-first location fence, 6-second location fence, 7-path fence, 8-straight path, 9-track, 10-rectangular region, 11-semicircular region, 12-capsule shape region, 13-start point, 14-end point;
4A-the starting point of the adjacent positioning point, and 4B-the end point of the adjacent positioning point.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The invention discloses a path perception electronic fence system for back-and-forth monitoring of students. The service platform comprises a server and service personnel, the positioning terminal is connected with the server through a communication network (Wi-Fi, Bluetooth, ZigBee, LoRa and cellular communication technologies, wherein the cellular communication technologies comprise 5G, 4G, 3G and 2G), monitoring information of the monitored student is reported, and the monitoring information comprises position information (from satellite positioning, Wi-Fi positioning, Bluetooth positioning or base station positioning) and time information. Satellite positioning includes GPS, glonass, galileo and beidou.
The server sets up a path-aware electronic fence. The path aware electronic fence is made up of 3 parts, including a first location electronic fence set at a home address, a second location electronic fence set at a service facility, and a path electronic fence set along a commuting path to and from a trainee. The path-aware electronic fence is an integrated electronic fence, and comprises regional information and constant path information of the fence. The frequent path information includes time period information, direction information and expected time consumption information allowing the monitored student to make round trip. The constant path is obtained based on the track record of historical round trips of the monitored student.
When the monitored student leaves the first position electronic fence or the second position electronic fence, the positioning terminal reports monitoring information every 10 seconds; and at other moments, the positioning terminal reports the monitoring information every 3 minutes.
And after receiving the monitoring information, the server processes and analyzes the monitoring information, automatically compares the analysis result with the area information, the direction information and the expected time-consuming information in the path sensing electronic fence, and informs a service staff of further processing when an abnormality occurs.
Referring to fig. 2, the movement route of the student back to home and the institution forms a movement path 3 connecting the home 1 and the institution 2, which includes intersections, turns, and the like. In a specific implementation, the travel path 3 is calculated by a plurality of positioning points 4 reported by the positioning terminal. The most common travel route 3 is selected as a route used when planning the electronic fence, for example, when the trainee goes home or at a facility.
Fig. 1 describes a specific generation manner of the travel route 3 and a process of extraction of information. The invention discloses a path-aware electronic fence system for the round-trip monitoring of students, which plans an electronic fence area for connecting a home 1 and an organization 2 for each student. At home 1 and organization 2, a first position electronic fence 5 and a second position electronic fence 6 with a radius of 100 meters are planned respectively by taking the address of home 1 and organization 2 as the center. A narrow passage with the width of 10 meters is planned along the traveling path 3 to serve as a path electronic fence 7. Further, in the route electronic fence 7, a plurality of points are selected from the positioning points 4, the travel route 3 is divided into a plurality of small areas, and according to the direction of the travel route 3, the time average value reaching the areas in the history record is used for calculating the reasonable time consumption for reaching the positioning points from the starting point when the travel route advances according to the direction of the travel route 3, and the reasonable time consumption is recorded as the expected time consumption information of the travel route 3. The direction of the travel path 3 is the direction information of the travel path 3.
Referring to fig. 3, the positioning points 4 are discretely distributed on the track 9, and the travel path 3 is calculated according to the track 9. The acquisition of the track 9 comes from position information and time information in monitoring information reported by a terminal, and the specific steps comprise:
step 301, when the student leaves the first position electronic fence 5 or the second position electronic fence 6, or when the family member or the institution operates and the supervised student leaves the family member or the institution, generating a track 9 is started;
step 302, the positioning terminal collects self information to obtain monitoring information and reports the monitoring information to a server;
step 303, the server records the reported monitoring information, and separates out position information and time information from the monitoring information to obtain a track 9;
and step 304, repeating the steps 302 to 303 until the generation of the track 9 is stopped after the student enters the first position electronic fence 5 or the second position electronic fence 6 or when the monitored student enters the house or the institution as the operation of the family members or the institution is set.
When the travel path 3 is calculated, if two positioning points are directly connected, the calculation result and the actual walking track 9 of the person may have some non-conformity. For example, if two positioning points 4 are connected by a straight path 8, it may happen that the straight path 8 does not coincide with the trajectory 9. To solve such problems, it is necessary to obtain an approximate path corresponding to the actual situation in combination with the map because, in general, the trainee only walks on a normal road and cannot walk across a house or across obstacles.
Referring to fig. 4, in a specific calculation manner, the actual road is a curved shape, two adjacent anchor points are an adjacent anchor point starting point 4A and an adjacent anchor point ending point 4B, and if the adjacent anchor point starting point 4A and the adjacent anchor point ending point 4B are directly connected, then the result is a straight line path 8 which is seriously inconsistent with the track 9. However, if the shortest path between two points is solved in conjunction with map information, a curved travel path 3 can be obtained that follows the trajectory 9. The method specifically comprises the following steps:
step 201, selecting positions of two positioning points adjacent in time from the track 9 according to the time information to form an adjacent positioning point starting point 4A and an adjacent positioning point end point 4B;
step 202, projecting a starting point 4A of an adjacent positioning point and an end point 4B of the adjacent positioning point onto a map;
step 203, on the map, eliminating unreasonable path selection, and solving the shortest path between the starting point 4A of the adjacent positioning point and the end point 4B of the adjacent positioning point to obtain a reasonable path;
step 204, repeating the steps 201 to 203 until all points in the track 9 are traversed to obtain one or more reasonable paths;
and step 205, sequencing by time information, connecting all reasonable paths, and recording path direction information to form a traveling path 3.
As shown in fig. 5, after the travel path 3 is calculated, a path-aware electronic fence area can be established based on the travel path 3, which specifically includes:
step 101, decomposing the traveling path 3 into a plurality of continuous sub-paths;
as shown in figure 6 of the drawings,
step 102, expanding the sub-paths to two sides by 5 meters respectively by taking the sub-paths as axes to form a rectangular area 10 by taking the sub-paths as symmetry axes, wherein the width of the rectangular area 10 is 10 meters;
103, placing semicircular areas 11 with the diameter equal to the width of the rectangle (10 meters) at two ends of the rectangular area 10, and combining the semicircular areas 11 with the rectangular area 10 to form a capsule-shaped area 12;
step 104, repeating steps 102 to 103 until all sub-paths form the capsule shaped area 12;
105, connecting the capsule-shaped areas 12 end to end, wherein the connection point is the circle center of the semicircular areas 11 at the two ends of the capsule-shaped area 12;
as shown in figure 7 of the drawings,
106, removing all the internal lines of the overlapped part and reserving the peripheral lines of the overlapped part to form the path electronic fence;
step 107, forming a circular first position electronic fence 5 by taking the home address positioning point as the center of a circle and taking the radius of the home address positioning point as 100 meters;
step 108, forming a circular second position electronic fence 6 by taking the mechanism address positioning point as a circle center and taking the radius of the mechanism address positioning point as 100 meters;
step 109, connecting the first position electronic fence 5 with the path electronic fence 6 in a manner that the semi-circle center of one end of the path electronic fence 7 is placed on the circle center of the first position electronic fence 5;
step 110, removing the inner lines of the overlapped part of the first position electronic fence 5 and the path electronic fence 7, and reserving the outer lines of the overlapped part;
step 111, connecting the second position electronic fence 6 with the path electronic fence 7 in a manner that the circle center of a semicircle at one end of the path electronic fence 7 is placed on the circle center of the second position electronic fence 6;
step 112, removing the inner lines of the overlapped part of the second position electronic fence 6 and the path electronic fence 7, and reserving the outer lines of the overlapped part;
step 113, connecting all the reserved lines to form a closed area, and forming area information of the path sensing electronic fence;
and step 114, recording the path direction information of the traveling path 3 to form the direction information of the path perception electronic fence.
The way of establishing the path-aware electronic fence area based on the travel path may also be:
step 101a, decomposing the traveling path into a plurality of continuous sub-paths, wherein the length of each sub-path is 5 meters;
102a, forming a plurality of circles by taking the center point of each sub-path as the center of a circle and the radius of the circle is 5 meters;
step 103a, removing the internal lines of the overlapped parts of the plurality of circular areas and reserving the peripheral lines of the overlapped parts to form the path electronic fence;
104a, forming a circular first position electronic fence by taking a home address positioning point as a circle center and taking the radius of the home address positioning point as 100 meters;
105a, forming a circular second position electronic fence by taking the mechanism address positioning point as a circle center and taking the radius of the mechanism address positioning point as 100 meters;
106a, connecting the first position electronic fence with the path electronic fence in a manner that the circle center of a 5-meter circle at one end of the path electronic fence is placed on the circle center of the first position electronic fence;
step 107a, removing the inner lines of the overlapped part of the first position electronic fence and the path electronic fence, and reserving the outer lines of the overlapped part;
step 108a, connecting the second position electronic fence with the path electronic fence in a manner that the circle center of a 5-meter circle at one end of the path electronic fence is placed on the circle center of the second position electronic fence;
step 109a, removing the inner lines of the overlapped part of the second position electronic fence and the path electronic fence, and reserving the outer lines of the overlapped part;
step 110a, connecting all the reserved lines to form a closed area and form area information of the path sensing electronic fence;
and step 111a, recording the path direction information of the advancing path to form the direction information of the path perception electronic fence.
Referring to fig. 8, the path-aware electronic fence of the present invention further includes time information for determining whether an abnormal situation occurs during the course of the trainee moving from the starting point 13 to the ending point 14. The time information calculating step includes:
step 401, dividing the path sensing electronic fence into a plurality of small areas, wherein each small area comprises one specific positioning point 4;
step 402, obtaining the time consumed by the trainee from the starting point 13 to each small area from the track 9;
step 403, repeating step 402 for a plurality of track records to obtain a plurality of consumed time corresponding to each small area, and calculating an average value of all consumed time;
and step 404, taking the average value as the expected time consumption of the specific positioning point 4 corresponding to the small area, and storing the expected time consumption into the constant path time information corresponding to the path perception electronic fence.
After the monitoring information is received by the server, analyzing and storing the received monitoring information, and simultaneously comparing the position information in the monitoring information with the area information in the normal path corresponding to the path perception electronic fence:
1. when the position information is found to exceed the area information, an abnormal situation is reported to the service personnel. (fence crossing).
The fence border crossing is realized in 2 ways, one way is that reported position information is used for determining positioning points, then whether the positioning points are positioned in a range specified by the area information of the electronic fence is compared, if the positioning points are not positioned in the range specified by the area information of the electronic fence, the positioning points are judged to be border crossing, and the concrete steps are as follows:
step 701a, obtaining position information in the monitoring information;
step 702a, judging whether the positioning point of the position information is in the range of the area information, and if the positioning point is not in the range, judging that the positioning point exceeds the area information;
considering that there may be drift due to inaccurate positioning, the accuracy can be further improved by using a range comparison method, and the specific steps are as follows:
step 701b, obtaining position information in the monitoring information;
step 702b, if the position is near the path electronic fence (on the constant path), then a circle with a radius of 5 meters is drawn by taking the positioning point of the position information as the center (here, the size of the extended range should be close to the path electronic fence area, too small effect is not obvious, and too large alarm is easy to miss). If the location is near a home or an organization (near the electronic fence at the first location or the second location), a circle with a radius of 100 meters is drawn with the location point of the location information as the center.
And 703b, judging whether the centers of the circular range and the area range defined in the electronic fence are overlapped, and if not, judging that the area range is out of range.
2. And the server side sets a time period for the student to go out reasonably, and if the position information reported by the student exceeds the first position electronic fence area or the second position electronic fence area outside the time period, abnormal conditions are reported to the service staff. During this time period, the trainee is allowed to leave the first location fence area or the second location fence area and enter the pathway fence area.
When a student enters a path electronic fence area in a trip time period, the server calculates the movement direction of the positioning terminal according to a plurality of pieces of nearest position information in the monitoring information, and reports abnormal conditions to service personnel when the movement direction is not consistent with the direction information of a normal path (a traveling path) corresponding to the path sensing fence. (error in orientation)
3. When a student enters a path electronic fence area in a trip time period, after receiving the monitoring information, the server finds a specific positioning point which is closest to the received position information but does not arrive, compares expected time-consuming information corresponding to the specific positioning point with time information in the monitoring information, and reports abnormal conditions to a service staff when the time information in the monitoring information is larger than the expected time-consuming information. (time exception)
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A path perception electronic fence system for back-and-forth monitoring of students comprises a positioning terminal, a service platform and a communication network, and is characterized in that the service platform comprises a server and service personnel, the positioning terminal is connected with the server through the communication network, and monitoring information of the monitored students is reported; the monitoring information comprises position information and time information;
the server sets a path-aware electronic fence; the path perception electronic fence is formed by combining a first position electronic fence arranged at a first position, a second position electronic fence arranged at a second position and a path electronic fence along the normal path to form an integral electronic fence, and comprises regional information; the path-aware electronic fence also includes the constant path, which is derived based on a trajectory record of historical round trips of the supervised student.
2. The path-aware electronic fence system of claim 1, wherein the constant path comprises path direction information and further comprises time period information allowing the supervised student to make round trips;
when the monitored student leaves the first position electronic fence or the second position electronic fence, the positioning terminal reports the monitoring information every M seconds; at other moments, the positioning terminal reports the monitoring information every N minutes; the server receives and processes the monitoring information;
the communication network comprises Wi-Fi, Bluetooth, ZigBee, LoRa and cellular network communication technologies; the cellular network communication technology comprises 5G, 4G, 3G and 2G; the positioning mode used by the positioning terminal comprises satellite positioning, Wi-Fi positioning, Bluetooth positioning or base station positioning.
3. The path-aware electronic fence system of claim 1, wherein the path-aware electronic fence formation comprises:
step 101, decomposing the constant path into a plurality of continuous sub-paths;
step 102, expanding towards two sides by taking the sub-path as an axis to form a pipeline shape comprising the sub-path;
103, connecting the shapes of the pipelines end to end;
step 104, removing all the internal lines of the overlapped part and reserving the peripheral lines of the overlapped part to form the path electronic fence;
step 105, forming the first position electronic fence by taking the positioning point of the first position as a center;
step 106, forming the second position electronic fence by taking the positioning point of the second position as a center;
step 107, connecting the first position electronic fence and the path electronic fence in a manner that one end of the path electronic fence is placed on the center of the first position electronic fence;
step 108, removing the inner lines of the overlapped part of the first position electronic fence and the path electronic fence, and reserving the outer lines of the overlapped part;
step 109, connecting the second position electronic fence and the path electronic fence in a manner that one end of the path electronic fence is placed on the center of the second position electronic fence;
step 110, removing the inner lines of the overlapping part of the second position electronic fence and the path electronic fence, and reserving the outer lines of the overlapping part;
step 111, connecting all the reserved lines to form a closed area, and forming the area information of the path sensing electronic fence;
and 112, recording the path direction information of the constant path to form the direction information of the path perception electronic fence.
4. The path-aware electronic fence system of claim 1, wherein the constant path is computed based on one or more historical trajectories of the trainee; the track record contains the monitoring information; the generation of the constant path comprises the following steps:
step 201, selecting the positions of two positioning points adjacent in time from the track record according to the time information to form adjacent positioning points;
step 202, projecting the adjacent positioning points to a map;
step 203, eliminating unreasonable path selection on the map, and solving the shortest path between the adjacent positioning points to obtain a reasonable path;
step 204, repeating the steps 201 to 203 until all points in the track record are traversed to obtain one or more reasonable paths;
and step 205, sorting the time information, connecting all the reasonable paths, and recording the path direction information to form the constant path, wherein the direction of the reasonable path is recorded as the path direction information of the constant path.
5. The path-aware electronic fence system of claim 1, wherein generating the track record comprises the steps of:
step 301, when the supervised student leaves the first location electronic fence or the second location electronic fence, or when a family member or an organization operates and the supervised student leaves the first location or the second location, starting generation of the track record;
step 302, the positioning terminal collects self information to obtain the monitoring information and reports the monitoring information to the server;
step 303, the server records the reported monitoring information, and separates the position information and the time information from the reported monitoring information to obtain the track record;
and 304, repeating the steps 302 to 303 until the trainee enters the first position electronic fence or the second position electronic fence, or when a family member or a mechanism operates and the trainee to be monitored reaches the first position or the second position, stopping the generation of the track record.
6. The path-aware electronic fence system of claim 1, wherein the path-aware electronic fence comprises the constant path and further comprises expected time-consuming information; setting a plurality of specific positioning points in the path perception electronic fence; recording the expected time consumption information of the constant path by the monitored student along the direction specified in the direction information of the constant path, starting from the starting point and reaching each reasonable time consumption of the specific positioning point.
7. The path-aware electronic fence system of claim 6, wherein the expected time-consuming information calculating step comprises:
step 401, dividing the path-aware electronic fence into a plurality of small areas, wherein each small area comprises one specific positioning point;
step 402, obtaining the time consumed by the trainee from the starting point to each small area from the track record;
step 403, repeating step 402 for a plurality of track records to obtain a plurality of consumed time corresponding to each small region, and calculating an average value of all the consumed time;
step 404, taking the average value as the reasonable time consumption of the specific positioning point corresponding to the small region, and saving the reasonable time consumption as the expected time consumption information of the constant path.
8. The path-aware electronic fence system of claim 1, wherein the server, upon receiving the monitored information, processes the information according to the following steps:
step 501, the server compares the location information in the monitoring information with the area information of the path-aware electronic fence, and when finding that the location information exceeds the area information of the path-aware electronic fence, reports an abnormal condition to the service staff, and completes processing; otherwise, go to step 502;
step 502, the server compares the time information in the monitoring information with the time period information of the constant path corresponding to the path sensing electronic fence, and when the comparison result does not allow the monitored student to go out, step 503 is executed, otherwise step 504 is executed;
step 503, when the position information is found to exceed the area information contained in the first position electronic fence and the second position electronic fence, reporting an abnormal condition to the service staff, and completing the processing; otherwise, go to step 504;
step 504, when finding that the location information is in the area information included in the path electronic fence, the server calculates a moving direction of the positioning terminal according to a plurality of pieces of location information which are most recent in history, and when the moving direction does not conform to the direction information of the normal path corresponding to the path sensing electronic fence, reports an abnormal condition to the service staff, and completes processing; otherwise, the exception is not reported and the process is completed.
9. The path-aware electronic fence system of claim 6, wherein the server, upon receiving the monitored information, processes the information according to the following steps:
step 601, the server compares the location information in the monitoring information with the area information of the path-aware electronic fence, and when finding that the location information exceeds the area information of the path-aware electronic fence, reports an abnormal condition to the service staff, and completes processing; otherwise, go to step 602;
step 602, the server compares the time information in the monitoring information with the time period information of the constant path corresponding to the path sensing electronic fence, and when the comparison result does not allow the supervised student to go out, step 603 is entered, otherwise step 604 is entered;
step 603, when the position information is found to exceed the area information contained in the first position electronic fence and the second position electronic fence, reporting an abnormal condition to the service staff, and finishing the processing; otherwise, go to step 604;
step 604, when finding that the location information is in the area information included in the path electronic fence, the server calculates a moving direction of the positioning terminal according to a plurality of pieces of location information which are most recent in history, and when the moving direction does not accord with the direction information of the normal path corresponding to the path sensing electronic fence, reports an abnormal condition to the service staff, and completes processing; otherwise, go to step 605;
step 605, the server finds the specific positioning point which is closest to the position information but has not yet arrived, compares the expected time-consuming information corresponding to the specific positioning point with the time information in the monitored information, and reports an abnormal condition to the service staff when the time information in the monitored information is greater than the expected time-consuming information, and the processing is completed; otherwise, the exception is not reported and the process is completed.
10. The path-aware electronic fence system according to claim 8 or 9, wherein the server performs the step of comparing the regional information by:
step 701a, obtaining position information in the monitoring information;
step 702a, judging whether the positioning point of the position information is in the range of the area information, and if the positioning point is not in the range, judging that the positioning point exceeds the area information;
the step of comparing the area information by the server may further be:
step 701b, obtaining position information in the monitoring information;
step 702b, expanding a shape range by taking the positioning point of the position information as a center;
and 703b, judging whether the shape range is overlapped with the center of the range of the area information or not, and if not, judging that the shape range is beyond the area information.
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