DESC:FORM-2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)

Title: A NOVEL METHOD OF MAPPING SURVEILLANCE EVENTS IN UNDERGROUND VIBRATION DETECTION SYSTEM

APPLICANT DETAILS:
(a) NAME: BHARAT ELECTRONICS LIMITED
(b) NATIONALITY: Indian
(c) ADDRESS: Outer Ring Road, Nagavara, Bangalore 560045, Karnataka, India

PREAMBLE TO THE DESCRIPTION:
The following specification (particularly) describes the nature of the invention (and the manner in which it is to be performed):

A NOVEL METHOD OF MAPPING SURVEILLANCE EVENTS IN UNDERGROUND VIBRATION DETECTION SYSTEM

FIELD OF INVENTION:
The present disclosure relates to a method of geo-locating intruder surveillance event positions along an optical fibre network in an Underground Vibration Detection System.

BACKGROUND OF THE INVENTION:
The following background discussion includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication expressly or implicitly referenced is prior art.
A Signal Processor and Alerts Generator hardware in the Underground Vibration Detection System provides the location of events of interest in the form of distance from a point of origin in the fibre network. This distance needs to be displayed to the end user in a meaningful manner in a map so that necessary action can be taken at the point of the events of interest. The actions can include reaching the point of interest in the fibre network for taking a security measure for example, to catch an intruder. There is therefore a need for a method that calculates the geo-location of the event of interest in terms of latitude and longitude which can be displayed in a map in a visually distinct manner to the user. There are no existing surveillance event display methods for the same purpose in the industry.
US11726221 titled “Systems and methods for identifying deployed cables” describes a method to maintain an integrity of deployed fibre cables. Network service providers need to repair fibre cable problems in the field, such as a fibre cut, high loss splice points, tightly bending points, and/or the like. When a deployed fibre cable experiences a fault (e.g., a fibre cut), a field technician may be deployed to correct the issue. The field technician needs to identify a location of the fault quickly so that the field technician may travel to the location and correct the fault in the fibre cable. The system may determine a location associated with the characteristic based on the cable map. In this method location is used only to track the deployed cables and is stored as one location per cable.
US9316762 titled “Geo-locating positions along optical waveguides” describes methods for geo-locating positions along optical waveguides. An operator may carry a portable, battery powered, hand-held device containing a Global Positioning System (GPS) satellite receiver, a microprocessor, a speaker and/or vibrator, and an application designed to modulate the GPS coordinates as acoustic information via the speaker or vibrator to the fibre. For example, the device may be a smart phone equipped with a mobile application that automatically performs these functions at the push of a button. A specialized application can be installed on the device that, when directed by an operator, will read the GPS coordinates from the GPS receiver, calculate an acoustic waveform to transmit the location information (e.g., including latitude, longitude and altitude) obtained from the GPS receiver, and transmit the waveform via the speaker or vibrator. The indication of the physical location may include a latitude and longitude of the physical location, and/or a descriptor of the physical location.
Therefore, it is felt for a need for an invention which can provide an integrated approach of displaying geo-location of surveillance events in an Underground Vibration Detection System to the user in a visually distinct manner in a map.

OBJECTIVES OF THE INVENTION:
The primary object of the present invention is to provide a method and system of geo-locating intruder surveillance event positions along an optical fibre network in an Underground Vibration Detection System.

SUMMARY OF THE INVENTION:
In an aspect, present invention provides a system of mapping surveillance events in an underground vibration detection system comprising:
a) a fibre optic cable network where the fibre optic cable network is buried underground where the buried fibre optic cable network forms plurality of vertex points of the polygon, where vertex point of the polygon is stored as GPS co-ordinates;
b) a signal processor is configured to receive vertex point data stored statically as GPS co-ordinates and process the vertex unit data as a set of points with latitude and longitude; and
c) an alerts generator hardware housed inside a server room receives the data from the signal processor to alert a user about an intruder;
wherein the zone of the intruder event in the fibre cable polygon is determined by the vertex points of the polygon.
In an embodiment, the angle made by the zone of the event with the longitude-axis of the longitude-latitude Geo co-ordinate axes is determined using the zone of the event.
In an embodiment, the latitude and longitude of the event is determined using the Angle, Zone and the Distance of the event from the closest vertex.
In an embodiment, the position of the intruder event is displayed in map on the user display device using the latitude and longitude of the event.
In an embodiment, for determining the zone of the event in the fibre cable polygon, the distance of the event location from fibre cable origin is compared with the Total fibre cable length by the signal processor.
In an aspect, present invention provides a method of mapping surveillance events in an underground vibration detection system comprising steps of:
a) burying a fibre optic cable network underground where the buried fibre optic cable network forms plurality of vertex points of the polygon, where vertex point of the polygon is stored as GPS co-ordinates; and
b) alerting a user by an alerts generator hardware housed inside a server room based on the data from the signal processor;
wherein the zone of the intruder event in the fibre cable polygon is determined by the vertex points of the polygon.

DETAILED DESCRIPTION OF DRAWINGS:
To further clarify advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which is illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of their scope. The invention will be described and explained with additional specificity and detail with the accompanying drawings in which:
Fig. 1: illustrates a flowchart that depicts the main blocks involved in order to determine the Geo location of the intruder event, in accordance with an exemplary implementation of the of the present invention.
Fig. 1b: illustrates a flowchart for determining the zone of the event in the fibre cable polygon, inside the function get_zone.
Fig. 1c: illustrates a flowchart in continuation, for determining the zone of the event in the fibre cable polygon, inside the function get_zone.
Fig. 1d: illustrates a flowchart for determining the angle made by the zone of the event with the longitude-axis of the longitude-latitude co-ordinate axes.
Fig. 1e: illustrates the process of finding other point in the zone of the event.
Figure 1f: illustrates the process of finding the distance of the event from the closest vertex.
Fig. 1g: illustrates the process of finding the Latitude and Longitude at the point of event, the Latitude and Longitude Geo Axes, an example cable network with reference points and vertices.
Fig. 1h: illustrates a block diagram of the complete Underground Vibration Detection System.
Figure 1i: illustrates the complex machine learning techniques such as supervised learning and implemented in a neural network, is used to iteratively generate an increasingly accurate model by testing models using the method of present invention. The trained model will be used to predict the intruder event on receiving the realtime field data.

DETAILED DESCRIPTION:
For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated system, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates.
It will be understood by those skilled in the art that the foregoing general description and the following detailed description are exemplary and explanatory of the invention and are not intended to be restrictive thereof.
The terms “comprises”, “comprising”, “includes”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a setup, device or method that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or device or method. In other words, one or more elements in a system or apparatus proceeded by “comprises... a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or method.
The present disclosure embodies an automated method of displaying geo-location of surveillance events in an Underground Vibration Detection System to the user in a visually distinct manner in a map.
This disclosure focuses on the use of the optical networks as part of an Underground Vibration Detection System for surveillance purposes. For example, intruder detection in an area of importance. An Underground Vibration Detection System consists of a Fibre Optic Cable network, a Signal Processor and Alerts Generator hardware housed inside a Server room, a Router for transferring LAN UDP data and a Control Room with a PC and Map Display for Monitoring the Surveillance. The Fibre Optic Cable network is buried underground in order to detect the presence of intruders when the intruder steps on the ground above the fibre cable. The network is connected to a Signal Processor and Alerts Generator hardware housed inside a Server room. The Signal Processor and Alerts Generator hardware detects the presence of an intruder and provides its location to the application. The application needs to geo-locate the intruder positions along the optical fibre network in order to display the positions in the form of latitude and longitude in a map. The Signal Processor and Alerts Generator hardware provides the location of events of interest in the form of distance from a point of origin in the fibre network. The application displays the location of events of interest to the end user in a meaningful manner in a map so that necessary action can be taken at the point of the events of interest. The actions can include reaching the point of interest in the fibre network for taking a security measure for example, to catch an intruder.
In an embodiment, the present invention includes an underground optical fibre network which can be visualized as a polygon of vertices where the geo-location of each vertex is well defined in terms of Latitude and Longitude. The geometry of the polygon of vertices can be used to determine the position of the intruder using an event location mapping technique.
In an embodiment, the present invention provides a system of mapping surveillance events in an underground vibration detection system comprising:
a) a fibre optic cable network where the fibre optic cable network is buried underground where the buried fibre optic cable network forms plurality of vertex points of the polygon, where vertex point of the polygon is stored as GPS co-ordinates;
b) a signal processor is configured to receive vertex point data from stored statically as GPS co-ordinates and process the vertex unit data as a set of points with latitude and longitude; and
c) an alerts generator hardware housed inside a server room receives the data from the signal processor to alert a user about an intruder;
wherein the zone of the intruder event in the fibre cable polygon is determined by the vertex points of the polygon.
In an embodiment, the angle made by the zone of the event with the longitude-axis of the longitude-latitude Geo co-ordinate axes is determined using the zone of the event.
In an embodiment, the latitude and longitude of the event is determined using the Angle, Zone and the Distance of the event from the closest vertex.
In an embodiment, the position of the intruder event is displayed in map on the user display device using the latitude and longitude of the event.
In an embodiment, for determining the zone of the event in the fibre cable polygon, the distance of the event location from fibre cable origin is compared with the Total fibre cable length by the signal processor.
In an embodiment, the present invention provides a method of mapping surveillance events in an underground vibration detection system comprising steps of:
a) burying a fibre optic cable network underground where the buried fibre optic cable network forms plurality of vertex points of the polygon, where vertex point of the polygon is stored as GPS co-ordinates; and
b) alerting a user by an alerts generator hardware housed inside a server room based on the data from the signal processor;
wherein the zone of the intruder event in the fibre cable polygon is determined by the vertex points of the polygon.
A scale factor for converting latitude and longitude differences to distance on the map is pre-determined.
The vertex points of the polygon formed by the fibre optic cable network is stored by using GPS technology as a set of points with latitude and longitude.
The zone of the event in the fibre cable network is determined by using the distance of the Event location from the fibre cable origin which is supplied as a parameter by the Signal Processor and Alerts Generator hardware. One single point of origin is designated in the cable network for reference. All intruder locations will be with reference to this origin.
The Total fibre cable length is the Sum of the distance between all the adjacent vertices of the cable network. The cable is divided into a number of Zones where every two adjacent points starting from the cable origin make a Zone. So the total number of Zones will be one less than the total number of vertices in the network.
The zone (the edge connecting two adjacent vertices) where the event is located is determined. For this purpose, the get_zone function is used. The distance of the Event location from Fibre cable origin is compared with the Total fibre cable length. If the distance of the Event location from Fibre cable origin is greater than the Total fibre cable length, then it is considered as an error of Invalid distance to event. If the distance of the Event location from Fibre cable origin is less than or equal to the Total fibre cable length, it is checked if all vertices in the fibre cable have been processed. If all the vertices have not been processed, then the first two vertices of the network (with respect to origin), are taken as the next Edge for processing. It is checked if the distance of the Event location from Fibre cable origin is less than the Distance between the two vertices in the edge. If not lesser, the next Edge (next pair of vertices) is processed. If it is lesser, The Zone of the event is the edge containing the initial vertices. It is then checked if the distance of the Event location from Fibre cable origin is less than half the Distance between the two vertices in the edge. If it is lesser, then the Nearest_vertex to the event is the first vertex in the edge. If not lesser, then the Nearest_vertex to the event is the next vertex in the edge.
The angle made by the zone of the event with the longitude-axis of the longitude-latitude Geo co-ordinate axes is determined. For this purpose, the Other point in the Zone of the event is determined.
Then it is checked if the Longitude of the Other point is equal to the Longitude of the Nearest_vertex point in the Zone. If it is equal, then an angle of Pi/2 is returned. If not equal, then an angle equal to tan ^ -1 (ratio of difference in longitude to latitude) is returned.
The distance of the event from the nearest vertex in the zone of the event is determined using the function get_dist_from_nearest_vertex. Set the distance to event (Distance_to_event) equal to the distance of the Event location from Fibre cable Origin. The previous zone length (Previous_zone_length) and length up to current zone (Length_upto_current_zone) are initialised to 0. The length up to current Zone is set equal to the sum of the length up to current zone and the distance between the vertices being processed. The distance between the vertices of the zone being processed is found using the function get_distance. If the Zone is the edge being processed, it is checked if the nearest vertex is equal to the first vertex in the edge. If it is equal, then distance of the event from the nearest vertex is the difference between the distance to event and the previous zone length. If the nearest vertex is not equal to the first vertex in the edge, then the distance of the event from the nearest vertex is the difference between the length up to current zone and the distance to event.
The distance between two vertices of an edge is determined using the function get_distance. The value of lat_scale_factor and lon_scale_factor is used for this purpose.
The latitude and longitude of the Event is determined using the function get_lat_long_at_event. The base of the triangle formed by the point of event with the Longitude Geo coordinate axis is calculated as equal to distance from closest vertex multiplied by COS (angle made by the zone of the event with the longitude-axis). The perpendicular of the triangle formed by the point of event with the Longitude Geo coordinate axis is calculated as equal to distance from closest vertex multiplied by SIN (angle made by the zone of the event with the longitude-axis).
It is then checked if the Longitude of the nearest vertex is less than or equal to the Longitude of the Other point in the Zone of the event. The Longitude of the Event point depends on whether the Longitude of the nearest vertex is less than or equal to or greater than the Longitude of the Other point in the Zone of the event.
It is then checked if the Latitude of the nearest vertex is less than or equal to the Latitude of the Other point in the Zone of the event. The Latitude of the Event point depends on whether the Latitude of the nearest vertex is less than or equal to or greater than the Latitude of the Other point in the Zone of the event.
Figure 1a illustrates a flowchart that illustrates the main blocks involved in order to determine the Geo location of the intruder event. It sets Scale factors for Latitude and Longitude axes as lat_scale_factor and Lon_scale_factor. It then Store the vertex points of the polygon formed by the edges of the fiber optic cable. It then Determine the zone of the event in the fiber cable polygon using function get_zone. It then Determines the angle made by the zone of the event with the longitude-axis of the longitude-latitude co-ordinate axes uding function get_theta. It then Determines the distance of the event from the closest vertex in the zone of the event using function get_dist_from_closest_vertex. It then Determine the latitude and longitude of the Event using function get_lat_long_at_event.
Figure 1b illustrates the process of Determining the zone of the event in the fibre cable polygon. It describes the processes inside the function get_zone. The distance of the Event location from Fibre cable origin is compared with the Total fibre cable length. If the distance of the Event location from Fibre cable origin is greater than the Total fibre cable length, then it is considered as an error of Invalid distance to event. If the distance of the Event location from Fibre cable origin is less than or equal to the Total fibre cable length, it is checked if all vertices in the fibre cable have been processed. Initially Index value of vertices is set to 0. If all the vertices have not been processed, then the first two vertices of the network (with respect to origin), i.e., P[Index] and P[Index + 1] are taken as the next Edge for processing. It is checked if the distance of the Event location from Fibre cable origin is less than the Distance between the two vertices in the edge. If not lesser, then the Index value is incremented by 1 to process the next Edge (next pair of vertices). If it is lesser, The Zone of the event is the edge containing vertices P[Index] and P[Index + 1]. It is then checked if the distance of the Event location from Fibre cable origin is less than half the Distance between the two vertices in the edge. If it is lesser, then the Nearest_vertex to the event is P[Index]. If not lesser, then the Nearest_vertex to the event is P[Index + 1].
Figure 1c is a continuation of the processes inside function get_zone.
Figure 1d illustrates the process of determining the angle made by the zone of the event with the longitude-axis of the longitude-latitude co-ordinate axes. It describes the processes inside the function get_theta. For this purpose, the Other point in the Zone of the event is determined. The Other point is the corresponding vertex adjacent to the Nearest_vertex in the same Zone of the event location. It is checked if the Nearest_vertex = P[Index] in the Zone. If so, then the Other point in the Zone is P[Index + 1], else the other point in the Zone is P[Index].
Then it is checked if the Longitude of the Other point is equal to the Longitude of the Nearest_vertex point in the Zone. If it is equal, then an angle of Pi/2 is returned. If not equal, then an angle equal to tan ^ -1 ((Other_point.longitude – Nearest_vertex.longitude) / (Other_point.latitude – Nearest_vertex.latitude))) is returned.
Figure 1e illustrates the process of finding Other point in the Zone of the event. It describes the processes inside the function get_other_point. The Other point is the corresponding vertex adjacent to the Nearest_vertex in the same Zone of the event location. It is checked if the Nearest_vertex = P[Index] in the Zone. If so, then the Other point in the Zone is P[Index + 1], else the other point in the Zone is P[Index].
Figure 1f illustrates the process of finding the distance of the event from the closest vertex in the zone of the event. It describes the processes inside the function get_dist_from_closest_vertex. Initialize point Index to 0. Set the distance to event (Distance_to_event) equal to the distance of the Event location from Fibre cable Origin. Set the previous zone length (Previous_zone_length) and length upto current zone (Length_upto_current_zone) to 0. Set the length up to current Zone equal to the sum of the length upto current zone and the distance between the vertices P[Index] and P[Index + 1]. The distance between the vertices P[Index] and P[Index + 1] is found using the function get_distance. If the Zone is the edge (P[Index], P[Index + 1]), it is checked if the nearest vertex is equal to P[Index]. If it is equal, then distance of the event from the nearest vertex is the difference between the distance to event and the previous zone length. If the nearest vertex is not equal to P[Index], then the distance of the event from the nearest vertex is the difference between the length up to current zone and the distance to event.
Figure 1g illustrates the process of finding the Latitude and Longitude at the point of event, the Latitude and Longitude Geo Axes, an example cable network with reference points and vertices.
Figure 1h illustrates a block diagram of the complete Underground Vibration Detection System. It consists of a Fibre Optic Cable network, a Signal Processor and Alerts Generator hardware housed inside a Server room, a Router for transferring LAN UDP data and a Control Room with a PC and Map Display for Monitoring the Surveillance.

In an embodiment, the present disclosure envisages a Computer Implemented Method of Mapping Surveillance Events in an Underground Vibration Detection System having a EventMap class wherein the vertex points of the Polygon formed by the Edges of the fibre optic cable are stored statically.
According to the method as disclosed herein, the Zone of the intruder event in the fibre cable polygon is determined using the vertex points.
According to the method as disclosed herein, the Angle made by the zone of the event with the longitude-axis of the longitude-latitude Geo co-ordinate axes is determined using the Zone.
According to the method as disclosed herein, the Distance of the event from the closest vertex in the Zone of the event is determined using the Angle and Zone.
According to the method as disclosed herein, the Latitude and Longitude of the Event is determined using the Angle, Zone and the Distance of the event from the closest vertex.
According to the method as disclosed herein, the Position of the Intruder Event is displayed in Map using the Latitude and Longitude of the Event.
According to the method as disclosed herein, the same invention can be ported to any Target Display Hardware with a processor of adequate speed, graphics support for at least 24 colours.
According to the method as disclosed herein, the Polygon formed by the Edges of the Fibre optic cable network can be extended to any number of Vertices depending on the Geometry of the area under surveillance.
According to the method as disclosed herein, the Zone of the Intruder event is found out iteratively by traversing the List of vertices in the Fibre cable network.
According to the method as disclosed herein, the Angle made by the zone of the event with the longitude-axis of the longitude-latitude Geo co-ordinate axes is determined using the Zone.
According to the method as disclosed herein, the Distance of the Intruder Event from the closest Vertex in the Zone of the event is determined iteratively using the Angle and Zone.
According to the method as disclosed herein, the Latitude and Longitude Geo Co-ordinates of the Intruder Event is determined iteratively using the Angle, Zone and the Distance of the event from the closest vertex in claim.
According to the method as disclosed herein, Position of the Intruder Event is determined iteratively and displayed in Map using the Latitude and Longitude of the Event.
Thus, the present disclosure focuses on a system and method of automatically determining geo-location of surveillance events in an Underground Vibration Detection System and displaying to the user in a visually distinct manner in a Map. The invention uses a mathematical formulation and aims at an integrated approach of determining and displaying the Geo location of an Intruder event in Map, in terms of latitude and longitude. The method can be used for any number of Vertices in the polygon formed by the Fibre optic network. The Optical Fibre network is visualized as a polygon with a number of Vertices. The Geo locations of the vertices are statically stored and the geometry of the polygon formed by the vertices is used to determine the position of the Intruder event using an iterative technique.
Thus, at least some of the technical advantages provided by the present disclosure include: providing accurate and visual experience to the user, adding more commercial value to the surveillance products, when run in a PC or any target hardware with a processor of adequate speed and graphics support, can be used as a general event geo-location technique in Underground Vibration Detection System and finds its importance in surveillance critical systems where displaying position of intruder events in map visually is important.
In the present invention more complex machine learning techniques such as supervised learning and implemented in a neural network, is used to iteratively generate an increasingly accurate model by testing models using the method of Figure 1i. The input is processed using a trained machine learning algorithm model in order to generate an output representing information about the accurate position of the intruder event.
The foregoing description has been set merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the substance of the invention may occur to person skilled in the art, the invention should be construed to include everything within the scope of the invention.
,CLAIMS:We Claim:

1. A system of mapping surveillance events in an underground vibration detection system comprising:
a) a fibre optic cable network where the fibre optic cable network is buried underground where the buried fibre optic cable network forms plurality of vertex points of the polygon, where vertex point of the polygon is stored as GPS co-ordinates;
b) a signal processor is configured to receive vertex point data stored statically as GPS co-ordinates and process the vertex unit data as a set of points with latitude and longitude; and
c) an alerts generator hardware housed inside a server room receives the data from the signal processor to alert a user about an intruder;
wherein the zone of the intruder event in the fibre cable polygon is determined by the vertex points of the polygon.
2. The system of mapping surveillance events in an underground vibration detection system as claimed in claim 1, wherein the angle made by the zone of the event with the longitude-axis of the longitude-latitude Geo co-ordinate axes is determined using the zone of the event.
3. The system of mapping surveillance events in an underground vibration detection system as claimed in claim 1, wherein the latitude and longitude of the event is determined using the Angle, Zone and the Distance of the event from the closest vertex.
4. The system of mapping surveillance events in an underground vibration detection system as claimed in claim 1, wherein the position of the intruder event is displayed in map on the user display device using the latitude and longitude of the event.
5. A method of mapping surveillance events in an underground vibration detection system comprising steps of:
a) burying a fibre optic cable network underground where the buried fibre optic cable network forms plurality of vertex points of the polygon, where vertex point of the polygon is stored statically as GPS co-ordinates; and
b) alerting a user by an alerts generator hardware housed inside a server room based on the data from the signal processor;
wherein the zone of the intruder event in the fibre cable polygon is determined by the vertex points of the polygon.