CN112116659A - Positioning device based on big data of computer - Google Patents
Positioning device based on big data of computer Download PDFInfo
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- CN112116659A CN112116659A CN202011022177.3A CN202011022177A CN112116659A CN 112116659 A CN112116659 A CN 112116659A CN 202011022177 A CN202011022177 A CN 202011022177A CN 112116659 A CN112116659 A CN 112116659A
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- 238000012545 processing Methods 0.000 claims abstract description 27
- 230000008054 signal transmission Effects 0.000 claims abstract description 13
- 238000013500 data storage Methods 0.000 claims description 16
- 238000007405 data analysis Methods 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/70—Determining position or orientation of objects or cameras
- G06T7/73—Determining position or orientation of objects or cameras using feature-based methods
- G06T7/74—Determining position or orientation of objects or cameras using feature-based methods involving reference images or patches
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0614—Improving the reliability of storage systems
- G06F3/0619—Improving the reliability of storage systems in relation to data integrity, e.g. data losses, bit errors
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0629—Configuration or reconfiguration of storage systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/067—Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18545—Arrangements for managing station mobility, i.e. for station registration or localisation
- H04B7/18547—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18545—Arrangements for managing station mobility, i.e. for station registration or localisation
- H04B7/18556—Arrangements for managing station mobility, i.e. for station registration or localisation using a location database
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10032—Satellite or aerial image; Remote sensing
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Abstract
The invention discloses a positioning device based on computer big data, which comprises a plurality of satellites for positioning objects, wherein the satellites are arranged in a staggered manner; a plurality of base stations for receiving satellite radio signals, a plurality of said base stations being wirelessly connected to a satellite; the back-end processing center is used for processing the ground signal and is electrically connected with the base station; the back-end computer is used for being operated by back-end workers and is electrically connected with the back-end processing center; and the base station is in wireless connection with the satellite through the wireless signal transmission module. The positioning device based on the computer big data comprises an active positioning system and a detection positioning system, wherein the active positioning system can be used for a user to actively position the position of the user, the detection positioning system can help a rear worker to search the position of an object to be positioned, the two systems are matched for use, and the positioning efficiency can be greatly improved under the background of the big data.
Description
Technical Field
The invention relates to the field of positioning devices, in particular to a positioning device based on computer big data.
Background
Big data (big data) refers to a collection of data whose content cannot be captured, managed and processed in a certain time with conventional software tools. Big data has five characteristics, namely large Volume (Volume), high speed (Velocity), diversity (Variety), low Value density (Value), and authenticity (Veracity). It has no statistical sampling method, but only observes and tracks what happens. The use of big data tends to be predictive analysis, user behavior analysis, or the use of some other advanced data analysis method.
The world of big data is not just a single, huge computer network, but an ecosystem of a series of participants, terminal equipment providers, infrastructure providers, network service providers, network access service providers, data service enablers, data service providers, contact services, data service retailers, etc., formed by a large number of active components and a multitude of participant elements. To date, the basic rudimentary form of such a data ecosystem has emerged, and the subsequent development will tend to segment the roles within the system, i.e., the market segment; adjustment of system mechanisms, i.e., innovation of business models; the adjustment of the system structure, namely the adjustment of the competitive environment and the like, thereby gradually enhancing the composite degree of the data ecosystem.
The positioning device, namely a device for accurately finding the position of an object, can be widely applied to the fields of military affairs, search and rescue, scientific research, criminal investigation and the like. The traditional positioning device has the defects of weak data analysis capability, poor positioning accuracy, long positioning time and the like. In order to solve the problems, the positioning device based on the big data of the computer is provided.
Disclosure of Invention
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a positioning device based on computer big data, which comprises a plurality of satellites for positioning objects, wherein the satellites are arranged in a staggered manner; a plurality of base stations for receiving satellite radio signals, a plurality of said base stations being wirelessly connected to a satellite; the back-end processing center is used for processing the ground signal and is electrically connected with the base station; the back-end computer is used for being operated by back-end workers and is electrically connected with the back-end processing center; and the base station is in wireless connection with the satellite through the wireless signal transmission module.
As a preferred technical scheme of the present invention, a cloud computer is disposed in the satellite, the cloud computer includes an image acquisition module for acquiring pictures and videos, a big data analysis module for analyzing data, and a big data processing module for processing data, and the image acquisition module, the big data analysis module, and the big data processing module are electrically connected to the cloud computer.
As a preferred technical solution of the present invention, the cloud computer is electrically connected to a cloud data storage module for storing data.
As a preferred technical scheme of the present invention, the image acquisition module includes a back-beam light guide camera and a multispectral scanner, and both the back-beam light guide camera and the multispectral scanner are electrically connected to the cloud computer.
As a preferred technical solution of the present invention, the back-end processing module includes a back-end processing module for processing the satellite backhaul data, and the back-end processing module is electrically connected to the back-end computer.
As a preferred technical solution of the present invention, the back-end processing unit is electrically connected to a back-end data storage module, and the back-end data storage module is electrically connected to a back-end computer.
The invention relates to a preferable technical scheme, which comprises an active positioning system and a monitoring positioning system, wherein the active positioning system sequentially comprises mobile electronic equipment, a base station, a wireless signal transmission module, a satellite and a rear-end processing center.
As a preferred technical scheme, the monitoring and positioning system sequentially comprises an image acquisition module, a big data analysis module, a big data processing module, a cloud data storage module, a wireless signal transmission module, a base station and a rear-end processing center.
The invention has the beneficial effects that:
the positioning device based on the computer big data comprises an active positioning system and a detection positioning system, wherein the active positioning system can be used for a user to actively position the position of the user, the detection positioning system can help a rear worker to search the position of an object to be positioned, the two systems are matched for use, and the positioning efficiency can be greatly improved under the background of the big data.
And secondly, the plurality of satellites can perform three-dimensional positioning on the object to be positioned, and the positioning precision is higher.
And the cloud computer and the back-end computer are both provided with data storage modules, so that data can be prevented from being lost while high-speed data transmission is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a positioning device based on big computer data according to the present invention;
FIG. 2 is a control schematic diagram of a positioning device based on big data of a computer according to the present invention;
FIG. 3 is a schematic diagram of an image capture module of a positioning device based on big data of a computer according to the present invention;
FIG. 4 is a control schematic diagram of an active positioning system of a positioning device based on big data of a computer according to the present invention;
FIG. 5 is a control schematic diagram of a computerized big data based pointing device detection positioning system of the present invention;
in the figure: 1. a satellite; 2. a base station; 3. a back-end processing center; 4. a back-end computer; 5. a wireless signal transmission module; 6. a cloud computer; 7. an image acquisition module; 71. a reverse-beam light guide camera; 72. a multispectral scanner; 8. a big data analysis module; 9. a big data processing module; 10. a cloud data storage module; 11. a back-end processing module; 12. and the back-end data storage module.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example (b): as shown in fig. 1 and fig. 2, a positioning device based on computer big data comprises a plurality of satellites 1 for positioning an object, wherein the satellites 1 are distributed in a staggered manner, the satellites 1 can perform three-dimensional positioning on the object to be positioned, and the positioning accuracy is higher; a plurality of base stations 2 for receiving wireless signals of the satellite 1, wherein a plurality of base stations 2 are wirelessly connected with the satellite 1; the back-end processing center 3 is used for processing ground signals, and the back-end processing center 3 is electrically connected with the base station 2; the back-end computer 4 can be operated by back-end workers, and the back-end computer 4 is electrically connected with the back-end processing center 3; and the base station 2 is in wireless connection with the satellite 1 through the wireless signal transmission module 5.
Be provided with high in the clouds computer 6 in the satellite 1, high in the clouds computer 6 is including being used for gathering picture and video image acquisition module 7 for big data analysis module 8 of analytic data and the big data processing module 9 that is used for handling data, image acquisition module 7, big data analysis module 8 and big data processing module 9 all with high in the clouds computer 6 electric connection.
The cloud computer 6 is electrically connected with a cloud data storage module 10 for storing data. The back-end processing center 3 is electrically connected to a back-end data storage module 12, and the back-end data storage module 12 is electrically connected to the back-end computer 4. The cloud computer 6 and the back-end computer 4 are both provided with data storage modules, so that data can be prevented from being lost while high-speed data transmission is guaranteed.
As shown in fig. 3, the image collecting module 7 includes a light reflection catheter camera 71 and a multispectral scanner 72, both the light reflection catheter camera 71 and the multispectral scanner 72 are electrically connected to the cloud computer 6, and the device can be used for collecting high-precision images, so that the positioning precision of the invention is higher. The back-end processing center 3 comprises a back-end processing module 11 for processing the data returned by the satellite 1, and the back-end processing module 11 is electrically connected with the back-end computer 4.
As shown in fig. 4, the system comprises an active positioning system and a monitoring positioning system, wherein the active positioning system comprises a mobile electronic device, a base station 2, a wireless signal transmission module 5, a satellite 1 and a back-end processing center 3 in sequence. The active positioning system can be used for the user to actively send the current position of the user, for example; when the user is stranded in the field, the position of accessible cell-phone isoelectron product transmission oneself, positional information is through basic station 2, satellite 1, when finally conveying the rear staff, and the rear staff just can accurately know the positional information of stranded person to can rescue it fast.
As shown in fig. 5, the monitoring and positioning system sequentially includes an image acquisition module 7, a big data analysis module 8, a big data processing module 9, a cloud data storage module 10, a wireless signal transmission module 5, a base station 2, and a back-end processing center 3. The detection positioning system can be used for finding objects or persons by a user according to the appearance characteristics, and specifically comprises the following steps: the rear end staff passes through wireless signal transmission module 5 and conveys the outward appearance information (shape, colour, volume etc.) of the object of undetermining to the satellite, and the information is handled the back through high in the clouds computer 6, and image acquisition module 7 begins to carry out diversified image acquisition, and when gathering the image of matching, wireless data transmission module 5 gives basic station 2 and rear end processing center 3 with data transmission, so the rear end staff just can accurately know the accurate position of the object of undetermining.
The working principle is as follows: the positioning device based on the computer big data comprises an active positioning system and a detection positioning system, wherein the active positioning system can be used for a user to actively position the position of the user, the detection positioning system can help a rear worker to search the position of an object to be positioned, the two systems are matched for use, and the positioning efficiency can be greatly improved under the background of the big data.
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A positioning device based on computer big data, comprising:
a plurality of satellites (1) for positioning objects, a plurality of the satellites (1) being arranged in a staggered manner;
a plurality of base stations (2) for receiving wireless signals of the satellite (1), a plurality of the base stations (2) being wirelessly connected with the satellite (1);
the back end processing center (3) is used for processing ground signals, and the back end processing center (3) is electrically connected with the base station (2);
the back-end computer (4) can be operated by back-end workers, and the back-end computer (4) is electrically connected with the back-end processing center (3);
the wireless signal transmission module (5) is used for data transmission, and the base station (2) is in wireless connection with the satellite (1) through the wireless signal transmission module (5).
2. The positioning device based on big computer data as claimed in claim 1, wherein:
be provided with high in the clouds computer (6) in satellite (1), high in the clouds computer (6) is including image acquisition module (7) that is used for gathering picture and video for big data analysis module (8) of analytical data and big data processing module (9) that are used for handling data, image acquisition module (7), big data analysis module (8) and big data processing module (9) all with high in the clouds computer (6) electric connection.
3. The positioning device based on big computer data as claimed in claim 2, wherein:
the cloud computer (6) is electrically connected with a cloud data storage module (10) used for storing data.
4. The positioning device based on big computer data as claimed in claim 2, wherein:
the image acquisition module (7) comprises a light reflection catheter camera (71) and a multispectral scanner (72), and the light reflection catheter camera (71) and the multispectral scanner (72) are both electrically connected with the cloud computer (6).
5. The positioning device based on big computer data as claimed in claim 1, wherein:
the back-end processing center (3) comprises a back-end processing module (11) used for processing data returned by the satellite (1), and the back-end processing module (11) is electrically connected with the back-end computer (4).
6. The positioning device based on big computer data as claimed in claim 5, wherein:
the rear-end processing center (3) is electrically connected with a rear-end data storage module (12), and the rear-end data storage module (12) is electrically connected with the rear-end computer (4).
7. The positioning device based on big computer data as claimed in claim 1, wherein:
the system comprises an active positioning system and a monitoring positioning system, wherein the active positioning system sequentially comprises mobile electronic equipment, a base station (2), a wireless signal transmission module (5), a satellite (1) and a rear-end processing center (3).
8. The positioning device based on big computer data as claimed in claim 7, wherein:
the monitoring and positioning system sequentially comprises an image acquisition module (7), a big data analysis module (8), a big data processing module (9), a cloud data storage module (10), a wireless signal transmission module (5), a base station (2) and a rear-end processing center (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011022177.3A CN112116659A (en) | 2020-09-25 | 2020-09-25 | Positioning device based on big data of computer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011022177.3A CN112116659A (en) | 2020-09-25 | 2020-09-25 | Positioning device based on big data of computer |
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| CN112116659A true CN112116659A (en) | 2020-12-22 |
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| CN202011022177.3A Pending CN112116659A (en) | 2020-09-25 | 2020-09-25 | Positioning device based on big data of computer |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103576177A (en) * | 2013-11-19 | 2014-02-12 | 潘自强 | Positioning tracking method |
| CN103616708A (en) * | 2013-11-15 | 2014-03-05 | 四川长虹电器股份有限公司 | Positioning search and rescue device based on Beidou satellite navigation system |
| CN106303408A (en) * | 2016-07-17 | 2017-01-04 | 安庆建金智能科技有限公司 | The method and apparatus that a kind of satellite based on positioning analysis is solved a case |
| CN111639204A (en) * | 2020-05-27 | 2020-09-08 | 皖西学院 | Internet of things positioning system based on remote sensing satellite |
-
2020
- 2020-09-25 CN CN202011022177.3A patent/CN112116659A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616708A (en) * | 2013-11-15 | 2014-03-05 | 四川长虹电器股份有限公司 | Positioning search and rescue device based on Beidou satellite navigation system |
| CN103576177A (en) * | 2013-11-19 | 2014-02-12 | 潘自强 | Positioning tracking method |
| CN106303408A (en) * | 2016-07-17 | 2017-01-04 | 安庆建金智能科技有限公司 | The method and apparatus that a kind of satellite based on positioning analysis is solved a case |
| CN111639204A (en) * | 2020-05-27 | 2020-09-08 | 皖西学院 | Internet of things positioning system based on remote sensing satellite |
Non-Patent Citations (1)
| Title |
|---|
| 裴忠民 等: ""面向快速响应产品的星上目标定位及识别方法"", 《南京航空航天大学学报》 * |
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Application publication date: 20201222 |