TECHNICAL FIELD
The present invention relates to a system for calibration of a submarine surveillance system and more particularly relates to an onsite calibration of the submarine surveillance system. .
BACKGROUND
Submarine surveillance systems are used in defense to estimate the level of RF signals for various peacetime and wartime operations. The systems are ultra-wideband (UWB) systems and require extensive calibration during the production at factory/installation on a submarine. Many apparatus and automated methods have been developed to perform the calibration at the factory. However, there is no apparatus to calibrate the system at the submarine.
Some of the prior methods and apparatus provide in-situ calibration of instruments.
US 6810753 B2 discloses a displacement transducer capable of measuring very small displacements (on the order of 100 urn or less) comprises a strain gage mounted to the curved arc of a substrate. The transducer can measure positive or negative displacement in a specimen and can also be used as an extremely sensitive load cell for very high-resolution weight, load or mass determinations.

[0005] US 5277054A discloses an apparatus for in-situ calibration of
distance measuring equipment. The method comprises obtaining a first distance
measurement in a first location, then obtaining at least one other distance
measurement in at least one other location of a precisely known distance from
the first location, and calculating a calibration constant. The method is applied
specifically to calculating a calibration constant for obtaining fluid level and
embodied in an apparatus using a pressure transducer and a spacer of precisely
known length. The calibration constant is used to calculate the depth of fluid
from subsequent single pressure measurements at any submerged position.
These instruments are there to measure pressure, liquid depth, and displacement.
The calibration of the instruments is performed by the apparatus to calculate the
depth of a fluid at any submerged position. In one of another prior invention, the
said invention discloses a displacement transducer capable of measuring very
small displacements comprise a gauge mounted on the surface of a submarine.
[0006] However, there is no system for in situ calibrations of the
surveillance system at the submarines.
SUMMARY
[0007] The summary of the present invention provides a method and a
system for accurately and precisely onsite calibration and testing of UWB surveillance system on submarines. This summary is neither intended to identify

essential features of the present invention nor is it intended for use in determining or limiting the scope of the present invention.
[0008] For example, various embodiments herein may include one or
more systems and methods for onsite calibration of a surveillance system installed on the base of a ship or on periscope of submarines. In one embodiment, the system includes a transmitting antenna configured to transmit a radio signals towards a UWB (ultra wideband) surveillance system that is to be calibrated. The said antenna is mounted on a telescopic arm. The said telescopic arm is fitted on a circular rim, so that the telescopic arm direction may be changed to perform the calibration process.
[0009] Further, the circular rim is fitted on the mast, and the said circular
rim may be rotated at different specified angles around the said mast. The system further includes a trolley assembly having a plurality of rollers, and gear & pinion mechanism. The plurality of rollers and gears & pinion mechanism are bolted on the said trolley assembly, to slide the said trolley assembly around the mast. An indication gauge is also mounted on the circular rim to identify the position of the antenna over 360 degrees. Further, the system includes a hand crank fitted to the pinion.
[0010] The system further includes a radio frequency (RF) amplifier
mounted at a fin area of the submarine near the said mast. The said RF amplifier is configured to transmit the signals towards the UWB surveillance system. The

radio frequency amplifier is also connected with an absorber. The absorber in the present invention is used to eliminate unwanted radiation.
[0011] The calibration system further includes a processing system
coupled with the transmitting antenna; the said processing system comprises a memory, a processor coupled to the memory, and a module unit. The said module unit includes a data collection module and a computing module. The said data collection module is configured, to collect data obtained during rotation of the transmitter antenna at variable distances from the surveillance system, at specified angles over azimuth and elevation directions. The said computing module is configured, to compute the data collected by the data collection module.
[0012] In another embodiment, the present invention discloses a method
for onsite calibrating and testing of an ultra-wide band surveillance system on submarines. The method includes transmitting, by an antenna, an RF signal towards a UWB surveillance system. Transmitting of the signals and vis-a-vis collecting the reflected signals, while rotating the transmitter antenna. The said transmitter antenna is rotated at variable distances from the surveillance system at specified angles over azimuth and elevation directions. The reflected signals are collected by a data collection module, and further computing is performed on the said collected data. The data collection modules collect the data obtained during rotation of the antenna at variable distances from the surveillance system

at specified angles over azimuth and elevation directions. The collected data is then computed by the computing module.
[0013] The method further includes eliminating, by an absorber, the
unwanted radiations. Further, the method includes, amplifying, by radio frequency amplifier, the transmitting signals. An indication gauge mounted on the circular rim, for identifying the position of the antenna over 360 degrees are discussed in the method of the present invention.
BRIEFDESCRIPTIONOFACCOMPANYINGDRAWINGS
[0001] The detailed description is described with reference to the
accompanying figures.
[0002] Fig.1 illustrates a schematic diagram depicting a processing system
connected to computing devices through a network, according to an exemplary implementation of the present invention.
[0003] Fig.2 illustrates a schematic diagram depicting a rim and a mast,
arrangement according to an exemplary implementation of the present invention.
[0004] Fig.3 illustrates a schematic diagram depicting fastening of the
circular rim, according to an exemplary implementation of the present invention.
[0005] Fig.4 illustrates a schematic diagram depicting a trolley assembly
having rollers, gear & pinion mechanism, according to an exemplary implementation of the present invention.

[0006] Fig.5A illustrates a schematic diagram depicting a telescopic arm
& antenna support assembly, according to an exemplary implementation of the
present invention.
[0007] Fig.5B illustrates a schematic diagram depicting a transmitting
antenna assembled on antenna support, according to an exemplary
implementation of the present invention.
[0008] Fig.6 illustrates a schematic diagram depicting a 3-d view of
antenna setup on a mast, according to an exemplary implementation of the
present invention.
[0009] Fig.7 illustrates a schematic diagram depicting angular spacing,
according to an exemplary implementation of the present invention.
[0010] Fig.8 illustrates a schematic diagram of hand crank, according to
an exemplary implementation of the present invention.
[0011] Fig.9A illustrates an elevation view of the onsite calibration
system, according to an exemplary implementation of the present invention.
[0012] Fig.9B illustrates a plan view of the onsite calibration system,
according to an exemplary implementation of the present invention.
[0013] Fig.10 illustrates a schematic flow chart of the calibration system,
according to an exemplary implementation of the present invention.

DETAILEDDESCRIPTION
[0014] In the following description, for the purpose of explanation,
specific details are set forth in order to provide an understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these details. One skilled in the art will recognize that embodiments of the present invention, some of which are described below, may be incorporated into several systems.
[0001] The various embodiments of the present invention provide a multi-
purpose system and a method for the onsite calibration of UWB surveillance system on submarines.
[0002] However, the systems and methods are not limited to the specific
embodiments described herein. Further, structures and apparatus shown in the figures are illustrative of exemplary embodiments of the present disclosure and are meant to avoid obscuring of the present disclosure.
[0003] Furthermore, connections between components and/or modules
within the figures are not intended to be limited to direct connections. Rather, these components and modules may be modified, re-formatted or otherwise changed by intermediary components and modules.
[0004] References in the present disclosure to “embodiment” or
“implementation” mean that a particular feature, structure, characteristic, or function described in connection with the embodiment or the implementation n

is included in at least one embodiment or implementation of the invention. The
appearances of the phrase “in an embodiment” in various places in the
specification are not necessarily all referring to the same embodiment.
[0005] It should be noted that the description merely illustrates the
principles of the present invention. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present invention. Furthermore, all examples recited herein are principally intended expressly to be only for explanatory purposes to help the reader in understanding the principles of the invention and the concepts contributed by the inventor to furthering the art and are to be construed as being without limitation to such specifically recited examples and conditions. Moreover, all statements herein reciting principles, aspects, and embodiments of the invention, as well as specific examples thereof, are intended to encompass equivalents thereof.
[0006] In an embodiment, the claimed subject-matter of the present
invention discloses the system for onsite calibration of the surveillance system on the submarines. A transmitting antenna is configured to transmit RF signals towards the UWB surveillance system. The UWB surveillance system may be off (but not limited to) a ship or the submarines. The said transmitting antenna is mounted on a telescopic arm. The said telescopic arm is designed in such a way, that multiple types of the transmitting antenna may be mounted. The

transmitting antennas may be directional antennas. The said telescopic arm is configured to adjust the height of the mounted transmitting antenna. Antenna support is mounted at one edge of the telescopic arm. The said antenna support is configured to hold the transmuting antenna in vertical polarization, horizontal polarization, and slant 45 degrees polarization.
[0007] In another embodiment, the present invention includes the
telescopic arm. The said telescopic arm is composed of a plurality of tabular rod
sections that are mounted so as to be slidable within each other and is connected
to the outermost rod section of the telescopic rod, and to the last inner rod
section of the telescopic rod. A Locking arrangement is also provided in the
areas of the inner end faces of individual sections of the telescopic arm.
[0008] In another embodiment, the present invention includes a trolley
assembly. The trolley assembly contains a plurality of rollers, gear & pinion mechanism. The plurality of the rollers, gear & pinion mechanism is bolted on the said trolley assembly. The said roller, gear and pinion mechanism help in sliding the said trolley assembly around a mast. Due to the rotation of the gear, the plurality of the rollers is rolled on the circular rim, around the mast. The said trolley assembly is mounted on the said circular rim.
[0009] In another embodiment, the present invention provides a spur gear
mechanism. The drive gear is known as input gear, and the gear that is being turned is referred to as output gear. These gears are comparable to continuously

applied levers; as one tooth is engaging, another is disengaging. The number of teeth(s) on each of gear wheel affects the action on the gear wheel it engages or meshes with. The gear wheel being turned is called the input gear and the one it drives is called the output gear. The gears with unequal numbers of teeth alter the speed between the input and the output. This is referred to as the gear ratio. The gears also alter the direction of rotation.
[0010] In another embodiment, the present invention includes the circular
rim. The circular rim and the mast are bolted with each other by a plurality of rim support. The circular rim is marked with angle details. An indication gauge is mounted on the circular rim using M4 screws. The indication gauge is used to identify the position of the system rotated over 360 degrees. Further, a hand crank is disclosed in the present invention, the said hand crank is fitted to the pinion.
[0011] In another embodiment, the present invention includes a processing
system coupled with the antennas, the processing system includes a memory, a processor coupled with the memory, and a module unit coupled with the processor. The module unit includes a data collection module and a computing module. The data collection module is configured to collect the data obtained during the rotation of the transmitting antenna at variable distances from the surveillance system at specified angles over azimuth and elevation directions. At each angle, the data from the surveillance system is collected. Further, the

computing module is configured to compute the data collected by the data
collection module. The computed data is loaded in the memory, in a table form.
[0012] In an embodiment, the present invention includes the onsite
calibration required over the frequency of operation i.e. 1-18 GHz (steps of 10
MHz) and over the dynamic ranges over 60 dB (steps of 0.5 dB) and over
azimuth direction (360-degree coverage) and elevation coverage (120 degrees).
[0013] In another exemplary embodiment, the present invention provides
a system used for calibration and testing of electronic support measure (ESM) system. The ESM system is fitted on to the platform or floating platform or on the submarine. The system is rotatable, high precision, accurately positioned with the line of sight (LOS) arrangement for transmitting radar signals on to the said ESM system.
[0014] In another embodiment, the present invention discloses a method
of an onsite calibrating surveillance system of submarines. The calibration method includes changing a transmitting antenna around a mast at specified angles over azimuth and elevation directions. The method further includes holding, by antenna support, the transmitting antenna in vertical polarization, horizontal polarization, and slant 45 degrees polarization. The antenna support holds the transmitting antenna.

[0015] In another embodiment, the method further includes, changing, by
a hand crank, the directions of the antenna around a mast at specified angles. The hand crank is fitted to the pinion to rotate the said pinion.
[0016] In another embodiment, the method further includes, transmitting,
by the antenna, the signals towards the surveillance system at each specified
angle. The signals are transmitted towards the UWB surveillance system of the
submarines that are to be calibrated. A radio frequency (RF) amplifier is
configured to transmit amplified signals towards the surveillance system.
[0017] In another embodiment, the method further includes, eliminating,
by an absorber, the transmitting signals. The absorber is configured to eliminate the reflections of the transmitted signals.
[0018] In another embodiment, the method further includes collecting, by
data collection module, data obtained during rotation of the transmitting antenna at variable distances from the surveillance system at specified angles over azimuth and elevation directions. At, each angle, the data from the UWB surveillance system is calculated, and the collected data is further sent to a computing module. The system has the capability to rotate by .5 degree step over the azimuth and elevation angles.
[0019] The method further includes computing, by the computing module,
the collected data during rotation of the transmitting antenna at variable distances from the UWB surveillance system at specified angles over azimuth

and elevation directions. The computed data is further tabled in the memory of the processing system to apply corrections.
[0020] It should be noted that the description merely illustrates the
principles of the present invention. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present invention. Furthermore, all examples recited herein are principally intended expressly to be only for explanatory purposes to help the reader in understanding the principles of the invention and the concepts contributed by the inventor to furthering the art and are to be construed as being without limitation to such specifically recited examples and conditions. Moreover, all statements herein reciting principles, aspects, and embodiments of the invention, as well as specific examples thereof, are intended to encompass equivalents thereof.
[0021] Fig. 1 illustrates a schematic block diagram of an onsite calibration
system according to an implementation of the present disclosure. The block diagram (100) includes a processing system (102), a transmitter antenna (118) to transmit the RF signals, ultra-wideband system (112), a database (110) to store the collected or calibrated data or processed data, a network (114) connected to the processing system (102) for communication, and a plurality of devices (116-a – 116n) connected with the network (114).

[0022] The network (114) interconnects the devices (116-a-116n) and the
database (110) with the processing system (102). The network (114) includes wired and wireless networks. Examples of the wired networks include a wide area network (WAN) or a local area network (LAN), a client-server network, a peer-to peer network, and so forth. Examples of the wireless networks include Wi-Fi, a global system for mobile communications (GSM) network, a general packet radio service (GPRS) network, an enhanced data GSM environment (EDGE) network, 802.5 communication networks, code division multiple access (CDMA) networks, or Bluetooth networks.
[0023] In the present implementation, the database (110) may be
implemented as an enterprise database, a remote database, local database, and the like. The database (110) may be located within the vicinity of the processing system (102) or may be located at different geographic locations as compared to that of the processing system (102). Further, the database (110) may themselves be located either within the vicinity of each other or may be located at different geographic locations. Furthermore, the database (110) may be implemented inside the processing system (102) or the database (110) may be implemented as a single database or a separate unit.
[0024] In the present implementation, the processing system (102)
includes one or more processors. The processor (104) may be implemented as one or more microprocessors, microcomputers, microcontrollers, digital signal

processors, central processing units, state machines, logic circuitries, and/or any devices that manipulate signals based on operational instructions. Among other capabilities, at least one processor (104) is configured to fetch and execute computer-readable instructions stored in the memory (106).
[0025] The memory (106) may be coupled to the processor (104). The
memory (106) can include any computer-readable medium known in the art including, for example, volatile memory, such as static random access memory (SRAM) and dynamic random access memory (DRAM), and/or non-volatile memory, such as read-only memory (ROM), erasable programmable ROM, flash memories, hard disks, optical disks, and magnetic tapes. The memory (106) also includes a cache memory to work with the processing system (102) more effectively.
[0026] Furthermore, the processing system (102) includes the module unit
(107). The module unit (107) include routines, programs, objects, components, data structures, etc., which perform tasks or implement particular abstract data types. The module unit (107) includes the data collection module (108-a) and the computing module (108-b). The data collection module (108-a) is configured to collect the data obtained during the rotation of the transmitting antenna (118) at variable distances from the UWB surveillance system (112) at specified angles over azimuth and elevation directions. The computing module (108-b) is

configured to compute the data collected by the data collection module (108-a) using software.
[0027] Fig.2 illustrates a schematic diagram depicting a circular rim (204)
and a mast (202), according to an exemplary implementation of the present invention. The figure depicts the mast (202) of the ship or the submarines and the circular rim (204).
[0028] Fig.3 illustrates a schematic diagram depicting fastening of the
circular rim (204), according to an exemplary implementation of the present invention. The circular rim (204) is rigidly mounted with the said mast (202) by a plurality of rim support (302).
[0029] Fig.4 illustrates a schematic diagram depicting a trolley assembly
(408) having plurality of rollers (402), gear (404) & pinion (406) mechanism, according to an exemplary implementation of the present invention. The trolley assembly (408) is a square shape trolley assembly (408). On the upper side, at both corners, the plurality of rollers (402) is mounted. On the lower side of the trolley assembly (408), at one corner the gear (404) is mounted, and on the other corner, the plurality of roller (402) is mounted. Further, the diagram includes the pinion (406) which is bolted just below the said gear (404). A hand crank (410) is fixed with the said pinion (406). The hand crank (404) is used to start the rotation motion. The gear and pinion mechanism provide rotation to the plurality of the rollers (402) of the trolley assembly (408). The rotation of gear

(404) drives the said plurality of rollers (402), to roll the said trolley assembly (408) on the said circular rim (204), around the said mast (202).
[0030] Fig.5A illustrates a schematic diagram depicting a telescopic arm
(502) & antenna support assembly (504), according to an exemplary implementation of the present invention. The said telescopic arm (502) composed of a plurality of tubular rod sections which are mounted so as to be slidable within each other and is connected to the outermost of the rod section of the telescopic arm (502), and to the last inner rod section of the telescopic arm (502). The locking arrangement is provided in the areas of the inner end faces of the individual sections.
[0031] Further, one end of the said telescopic arm (502) is mounted on the
upper surface of the said trolley assembly (408), and at the other end, the antenna support (504) is fixed.
[0032] Fig.5B illustrates a schematic diagram depicting a transmitting
horn (118) assembled on the antenna support (504), according to an exemplary implementation of the present invention. The transmitting horn or the transmitter antenna (118) is hold by antenna clamps and brackets of the antenna support (504). The transmitter antenna (118) transmits the signals towards the surveillance system (112) of the submarines for calibration. The calibration includes changing the transmitter antenna (118) around the mast (202) at specified angles over azimuth and elevation directions. At each angle, the

reflected signals from the surveillance system (112) are collected in the data collection module (108-a) and computed within the computing module (108-b). Further, the computed data is loaded in the memory (106) to apply the corrections.
[0033] Fig.6 illustrates a schematic diagram (600) depicting a 3-D view of
the antenna setup on the mast (202), according to an exemplary implementation
of the present invention. The diagram (600) depicts the mast (202) of the ship or
periscope of the submarine. The diagram (600) depicts the circular rim (204)
mounted on the mast (202). The said circular rim (204) and the mast (202) are
bolted with each other by the plurality of the rim support (302). The said
circular rim (204) holds the trolley assembly (408) in such a way that the trolley
assembly (408) may be rotated on the said circular rim (204). The said trolley
assembly (408) is having the plurality of rollers (402), gear (404) & pinion (406)
mechanism. The said plurality of the rollers (402), gear (404) & pinion (406)
mechanism is bolted on the said trolley assembly (408), to slide the said trolley
assembly (408) around the mast (202). The system may be rotated by .5 degree
step over azimuth and elevation angles. The rotation to the system is provided
due to the rotation of the gear (404), which further helps in driving the plurality
of the rollers (402) to roll on the circular rim (204), around the mast (202).
[0034] Further, the diagram (600) depicts the telescopic arm (502). The
said telescopic arm (502) is mounted with the front surface of the trolley

assembly (408). The antenna support (504) mounted on the telescopic arm (502) holds the transmitter antenna (118) by the antenna clamps & brackets (not shown in the figure).
[0035] Fig.7 illustrates a schematic diagram depicting an angular spacing,
according to an exemplary implementation of the present invention. The said circular rim (204) is marked with the angle spacing (702), located on an outer surface of the said circular rim (204). Fine angular adjustment is possible by hand cranking.
[0036] Fig.8 illustrates a schematic diagram depicting the hand crank,
according to an exemplary implementation of the present invention. The hand crank (410) is used to start the rotation motion. The said hand crank (410) consisting of a rotating shaft with a parallel handle, the said is fixed with the pinion (406).
[0037] Fig.9A illustrates a schematic diagram (900) depicting an elevation
view of the onsite calibration system, according to an exemplary implementation
of the present invention. The calibration system comprises the circular rim (204)
mounted to the mast (202). The said circular rim (204) and the mast (202) are
attached with each other by the rim support (302). The calibration system also
includes Pin-1 (902), Pin-2 (906), a bearing house (904, 910), and a shaft (908).
[0038] Further, the calibration system also includes the trolley assembly
(408) having the plurality of rollers (402), gear (404) & pinion (406)

mechanism. The rollers (402), gear (404) & pinion (406) mechanism are bolted on the said trolley assembly (408). Further, the said trolley assembly (408) is attached with the telescopic arm (502). The antenna support (504) is mounted on the said telescopic arm (502) to hold the transmitter antenna (118) in vertical polarization, horizontal polarization, and slant 45 degrees polarization. The antenna clamps and brackets are mounted with the antenna support (504) to hold the transmitter antenna (504). The calibration system also includes a radio frequency amplifier (not shown in the diagram) connected with the absorber (not shown in the diagram). The said RF amplifier is fitted at fin area of the submarine near to the mast. The said RF absorber is used to eliminate unwanted radiation.
[0039] The calibration system also includes the hand crank (410). The
detachable hand crank (410) is fitted to the pinion (406) of the trolley assembly (408). The said hand crank (410) rotates the said pinion (406).
[0040] Fig.9B illustrates a schematic diagram (1000) depicting a plan
view of the onsite calibration system, according to an exemplary implementation of the present invention.
[0041] Fig.10 illustrates a schematic flow chart (1100), according to an
exemplary implementation of the present invention. The onsite calibration of the surveillance system is performed by the following steps.

[0042] At step 1002, the antenna supports (504) hold the transmitting
antenna (118) in vertical polarization, horizontal polarization, and slant 45
degrees polarization. At step 1002, the height of the transmitting antenna (118)
is adjusted by sliding the rod section of the telescopic arm (502).
[0043] At step 1004, changing, by the hand crank (410), the directions of
the transmitting antenna (118) around the mast (202) at specified angles over
azimuth and elevations directions.
[0044] At step 1006, transmitting, by the antenna (118), the signal towards
the surveillance system (118) at each specified angle.
[0045] At step 1008, elimination process, by the absorber, the reflections
of the transmitting signal.
[0046] At step 1010, amplifying, by the radio frequency amplifier, the
transmitted signals;
[0047] At step 1012, gauging, by the indication gauge, the angles during
the calibration;
[0048] At step 1014, eliminating, by the indication gauge, the angles
during the calibration;
[0049] At step 1016, collecting, by the data collection modules (108-a),
data obtained during rotation of the antenna (118) at variable distances from the
surveillance system (112) at specified angles over the azimuth and the elevation
directions, and

[0050] At step 1018, computing, by the computing module (108-b), the
collected data during rotation of the transmitting antenna (118) at variable distances from the surveillance system (112) at specified angles over the azimuth and the elevation directions.
[0051] It should be noted that the description merely illustrates the
principles of the present invention. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present invention. Furthermore, all examples recited herein are principally intended expressly to be only for explanatory purposes to help the reader in understanding the principles of the invention and the concepts contributed by the inventor to furthering the art and are to be construed as being without limitation to such specifically recited examples and conditions. Moreover, all statements herein reciting principles, aspects, and embodiments of the invention, as well as specific examples thereof, are intended to encompass equivalents thereof.

List of Reference Numerals
Processing System: 102
Processor: 104
Memory: 106
Module Unit: 107
Data Collection Module: 108-a
Computing Module: 108-b
Database: 110
UWB system: 112
Network: 114
Device: 116a-116n
Transmitter Antenna: 118
Pin-1, Pin-2: 902, 906
Bearing House-1, Bearing House-2: 904, 910
Telescopic Arm: 502
Antenna Support: 504
Circular Rim: 204
Mast; 202
Rim support: 302
Roller: 402
Gear: 404
Pinion: 406
Trolley Assembly: 408
Hand Crank: 410
Spur: 702

We Claim:
1. A system for onsite calibration of a surveillance system, the system comprising:
a circular rim (204) mounted on a mast (202);
antenna support (504) to hold an antenna (118) in vertical polarization, horizontal polarization, and slant 45 degrees polarization;
a telescopic arm (502) to adjust the height of the antenna (118);
a trolley assembly (408) having a plurality of rollers (402), gear (404) & pinion (406) mechanism, wherein the plurality of the rollers (402), gear (404) & pinion (406) mechanism are bolted on the trolley assembly (408) to slide the said trolley assembly (408) around the mast (202);
an indication gauge to identify the position over 360 degrees, wherein the indication gauge is mounted on the circular rim;
a radio frequency amplifier connected with an absorber;
a hand crank (410) fitted to the pinion (406), wherein the hand crank (410) rotates the said pinion (406); and
a processing system (102) configured to calibrate data collection module (108-a) data, wherein the processing system (102) comprising:
a memory (106);
a processor (104) coupled with the memory (106);

a module unit (107) coupled with the processor (104), wherein the said module unit (107) comprises the data collection module (108-a) and a computing module (108-b),
wherein the data collection module (108-a) is configured to collect the data obtained during the rotation of the antenna (118) at variable distances from the surveillance system (112) at specified angles over azimuth and elevation directions; and
wherein the computing module (108-b) is configured to compute the data collected by the data collection module (108-a), and store computed data in the memory (106).
2. The system as claimed in claim 1, wherein the circular rim (204) and the mast (202) are bolted with each other by a plurality of rim support (302).
3. The system as claimed in claim 1, wherein the rotation of gear (404) drives the plurality of the rollers (402) to roll on the circular rim (204), around the mast (202).
4. The system as claimed in claim 1, wherein the telescopic arm (502) is mounted on the front surface of the trolley assembly (408).
5. The system as claimed in claim1, wherein the antenna support (504) is mounted on the telescopic arm (502).
6. The system as claimed in claim 1, wherein the radio frequency amplifiers are configured to amplify the transmitted signals towards the surveillance system (112).

7. The system as claimed in claim 1, wherein the absorber is configured to eliminate the reflections of the transmitted signals.
8. The system as claimed in claim 1, wherein the outer surface of the circular rim (204) is fastened with an angular spacing (702) for angle details.
9. The system as claimed in claim 1, wherein the antenna (118) covers an azimuth and elevation angles.
10. A method for onsite calibrating of a surveillance system comprising:
holding, by antenna support (504), an antenna (118) in vertical polarization, horizontal polarization, and slant 45 degrees polarization;
adjusting, by telescopic arm (502), the height of the antenna (118);
changing, by a hand crank (410), the directions of the antenna (118) around a mast (202), at specified angles;
transmitting, by the antenna (118), the signal towards the surveillance system (112) at each of the specified angles;
amplifying, by radio frequency amplifier, the transmitted signals;
gauging, by an indication gauge, the angles during the calibration;
eliminating, by an absorber, the reflections of transmitting signal;
collecting, by data collection modules (108-a), data obtained during rotation of the antenna (118) at variable distances from the surveillance system (112) at specified angles over azimuth and elevation directions, and

computing, by computing module (108-b), the collected data during rotation of the transmitting antenna (118) at variable distances from the surveillance system (112) at specified angles over azimuth and elevation directions.