CN109982306B - Positioning method, device and system based on antenna direction characteristics - Google Patents
Positioning method, device and system based on antenna direction characteristics Download PDFInfo
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- 238000001514 detection method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0252—Radio frequency fingerprinting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
- H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination
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Abstract
The invention discloses a positioning method based on antenna direction characteristics, which comprises the following steps: acquiring a detected preset signal value; the preset signal value is an RSSI value corresponding to the antenna; carrying out difference operation on each detected preset signal value and an appointed signal value to generate a positioning physical quantity; searching a plurality of sub-fingerprint data with the minimum difference value with the positioning physical quantity in a preset fingerprint database; wherein, each sub-fingerprint data has the angle information of the corresponding antenna; acquiring angle information of an antenna corresponding to each sub-fingerprint data, and drawing a direction line of the antenna corresponding to each sub-fingerprint data based on the angle information; and acquiring positioning information of the current position of the intersection point of the direction lines. The embodiment of the invention also discloses a positioning device based on the antenna direction characteristic and a positioning system based on the antenna direction characteristic. By adopting the embodiment of the invention, the positioning precision of the antenna can be effectively improved.
Description
Technical Field
The present invention relates to the field of antennas, and in particular, to a positioning method, apparatus, and system based on antenna directional characteristics.
Background
With the rapid development of cities, large buildings such as large underground parking lots and shopping centers are emerging continuously. In the indoor environment, it is desirable to quickly determine the location of the user and find a desired destination. The bluetooth positioning technology adopted in the prior art only relies on a single physical characteristic (such as RSSI value) of the WiFi signal to implement, and the absolute value of RSSI imposes a significant limitation on positioning accuracy due to environmental complexity. In terms of RSSI positioning, a method of absolute value corresponding to distance is currently used, and when there is an object shielding, the positioning accuracy of the method is greatly reduced. As shown in fig. 1, fig. 1 is a schematic diagram of RSSI change conditions when the ue and the antenna are at different relative positions (there is a blocking object) at the same position, and it can be known that the RSSI changes with the angle change of the ue, that is, the positioning accuracy based on the relationship between the RSSI absolute value and the distance is poor in the case of the blocking object.
Disclosure of Invention
The embodiment of the invention aims to provide a positioning method, a positioning device and a positioning system based on antenna direction characteristics, which can effectively improve the positioning accuracy of an antenna.
In order to achieve the above object, an embodiment of the present invention provides a positioning method based on antenna directional characteristics, including:
acquiring a detected preset signal value; the preset signal value is an RSSI value corresponding to the antenna;
carrying out difference operation on each detected preset signal value and an appointed signal value to generate a positioning physical quantity;
searching a plurality of sub-fingerprint data with the minimum difference value with the positioning physical quantity in a preset fingerprint database; wherein, each sub-fingerprint data has the angle information of the corresponding antenna;
acquiring angle information of an antenna corresponding to each sub-fingerprint data, and drawing a direction line of the antenna corresponding to each sub-fingerprint data based on the angle information;
and acquiring positioning information of the current position of the intersection point of the direction lines.
Compared with the prior art, the positioning method based on the antenna direction characteristic disclosed by the invention comprises the following steps of firstly, carrying out difference operation on each acquired preset signal value and an appointed signal value to generate a positioning physical quantity; secondly, searching a plurality of sub-fingerprint data with the minimum difference value with the positioning physical quantity in a preset fingerprint database; and finally, acquiring angle information of the antenna corresponding to each sub-fingerprint data, drawing direction lines of the antenna based on the angle information, and acquiring positioning information of which the intersection point of the direction lines is the current position.
The RSSI absolute value can be changed greatly when the object is shielded, but the attenuation of the same shielding object to each antenna of the same AP is consistent, so the RSSI relative value (namely the antenna direction characteristic fingerprint) among different antennas is kept unchanged, and by utilizing the information, the positioning method based on the antenna direction characteristic disclosed by the invention solves the problem of poor positioning precision caused by directly using the RSSI absolute value as the positioning information in the prior art, and can still keep high positioning precision when the object is shielded.
As an improvement of the above scheme, the method for generating the fingerprint database includes:
calculating first antenna gains of the detected antennas;
and acquiring a difference value between the first antenna gain and a preset second antenna gain as sub-fingerprint data of the current antenna to generate a fingerprint database containing a plurality of sub-fingerprint data.
As an improvement of the above scheme, the method for generating the fingerprint database includes:
acquiring preset signal values of a plurality of detected antennas;
and acquiring the difference value of each detected preset signal value and the appointed signal value as sub-fingerprint data of the current antenna so as to generate a fingerprint database containing a plurality of sub-fingerprint data.
As an improvement of the scheme, the antenna works in a WiFi mode or a Bluetooth mode.
In order to achieve the above object, an embodiment of the present invention further provides a positioning apparatus based on antenna directional characteristics, including:
the signal value detection unit is used for acquiring a detected preset signal value; the preset signal value is an RSSI value corresponding to the antenna;
the positioning physical quantity generating unit is used for carrying out difference operation on each detected preset signal value and a specified signal value to generate a positioning physical quantity;
the sub-fingerprint data searching unit is used for searching a plurality of sub-fingerprint data with the minimum difference value with the positioning physical quantity in a preset fingerprint database; wherein, each sub-fingerprint data has the angle information of the corresponding antenna;
the direction line obtaining unit is used for obtaining angle information of an antenna corresponding to each sub-fingerprint data and drawing a direction line of the antenna corresponding to each sub-fingerprint data based on the angle information;
and the positioning information acquisition unit is used for acquiring the positioning information of which the intersection point of the direction lines is the current position.
Compared with the prior art, the positioning device based on the antenna direction characteristic disclosed by the invention has the advantages that firstly, the positioning physical quantity generating unit performs difference operation on each preset signal value acquired by the signal value detecting unit and the appointed signal value to generate the positioning physical quantity; secondly, the sub-fingerprint data searching unit searches a plurality of sub-fingerprint data with the minimum difference value with the positioning physical quantity in a preset fingerprint database; and finally, the direction line acquisition unit acquires angle information of the antenna corresponding to each piece of sub-fingerprint data, draws direction lines of the antenna based on the angle information, and the positioning information acquisition unit acquires positioning information of which the intersection point of the direction lines is the current position.
The RSSI absolute value can be changed greatly when the object is shielded, but the attenuation of the same shielding object to each antenna of the same AP is consistent, so the RSSI relative value (namely the fingerprint of the antenna direction characteristic) among different antennas is kept unchanged, and by utilizing the information, the positioning device based on the antenna direction characteristic disclosed by the invention solves the problem of poor positioning precision caused by directly using the RSSI absolute value as the positioning information in the prior art, and can still keep high positioning precision when the object is shielded.
As an improvement of the above scheme, the method for generating the fingerprint database includes:
calculating first antenna gains of the detected antennas;
and acquiring a difference value between the first antenna gain and a preset second antenna gain as sub-fingerprint data of the current antenna to generate a fingerprint database containing a plurality of sub-fingerprint data.
As an improvement of the above scheme, the method for generating the fingerprint database includes:
acquiring preset signal values of a plurality of detected antennas;
and acquiring the difference value of each detected preset signal value and the appointed signal value as sub-fingerprint data of the current antenna so as to generate a fingerprint database containing a plurality of sub-fingerprint data.
As an improvement of the scheme, the antenna works in a WiFi mode or a Bluetooth mode.
In order to achieve the above object, an embodiment of the present invention further provides a positioning system based on antenna directional characteristics, including a plurality of antennas and the positioning device based on antenna directional characteristics described in any of the above embodiments.
Drawings
Fig. 1 is a schematic diagram illustrating RSSI changes when a ue and an antenna are at different relative positions at the same location;
fig. 2 is a flowchart of a positioning method based on antenna directional characteristics according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a positioning apparatus 10 based on antenna direction characteristics according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a positioning system 20 based on antenna direction characteristics according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 2, fig. 2 is a flowchart of a positioning method based on antenna directional characteristics according to an embodiment of the present invention; the method comprises the following steps:
s1, acquiring a detected preset signal value; the preset signal value is an RSSI value corresponding to the antenna;
s2, carrying out difference operation on each detected preset signal value and a specified signal value to generate a positioning physical quantity;
s3, searching a plurality of sub-fingerprint data with the minimum difference value with the positioning physical quantity in a preset fingerprint database; wherein, each sub-fingerprint data has the angle information of the corresponding antenna;
s4, obtaining angle information of an antenna corresponding to each sub-fingerprint data, and drawing a direction line of the antenna corresponding to each sub-fingerprint data based on the angle information;
and S5, acquiring the positioning information of the current position of the intersection point of the direction lines.
It should be noted that the positioning method based on the antenna direction characteristic according to the embodiment of the present invention may be implemented by a mobile terminal, and the mobile terminal may be a mobile phone, a tablet computer, or another mobile terminal capable of implementing a positioning function. In the embodiment of the invention, a plurality of antennas are arranged in a certain programmable range for transmitting signals, each antenna transmits the signals according to the same period, and the transmitted signals have equal strength. When a user holds the mobile terminal by hand and enters the signal range of the antenna, the positioning function can be started to be realized.
Preferably, the selected antenna operates in a WiFi mode or a bluetooth mode. When the antenna works in a WiFi mode, the antenna transmits WiFi signals; when the antenna is operating in a bluetooth mode, the antenna transmits bluetooth signals.
Specifically, in step S1, preset signal values at the current position are detected in a set frequency band, for example, the frequency band is a 2.4G frequency band, a 5G band1 frequency band, and a 5G band4 frequency band, and the detected preset signal values of all the antennas are obtained in the current frequency band.
Specifically, in step S2, the absolute value of RSSI changes greatly when the object is blocked, but since the attenuation of the same barrier for each antenna of the same AP is consistent, the relative value of RSSI (i.e., the antenna direction characteristic fingerprint) between different antennas is kept unchanged. With this information, the inherent disadvantage of using the absolute value of RSSI as positioning information can be avoided. At this time, the preset signal value of each antenna is obtained, and the difference operation is performed on all the preset signal values and the designated signal value to generate a positioning physical quantity, wherein the positioning physical quantity comprises a group of physical quantity data.
Specifically, in step S3, a plurality of sub-fingerprint data with the smallest difference value with the positioning physical quantity are searched in a preset fingerprint database; the fingerprint database comprises a plurality of sub-fingerprint data, and each sub-fingerprint data has angle information of an antenna corresponding to the sub-fingerprint data. That is, the positioning physical quantity is compared with sub-fingerprint data in the fingerprint database (the sub-fingerprint data is also a difference between signal values of all antennas detected at a certain position and a designated signal value sent by a designated antenna, and is also a set of physical quantity data) one by one, and the sub-fingerprint data with the minimum difference between the two sets of data is found out.
Specifically, in steps S4 to S5, angle information of an antenna corresponding to each piece of sub-fingerprint data is obtained, and a direction line of the antenna corresponding to each piece of sub-fingerprint data is drawn based on the angle information; and finally, acquiring the positioning information of the current position of the intersection point of the direction lines. That is, the user may be at/close to the intersection of the direction lines, and the geographical location information of the intersection of the direction lines may be used as the location of the current user.
In an implementation manner, the present invention further provides a method for generating a fingerprint database, where the method for generating a fingerprint database includes:
s21, calculating first antenna gains of the detected antennas;
and S22, acquiring the difference value between the first antenna gain and the preset second antenna gain as sub-fingerprint data of the current antenna to generate a fingerprint database containing a plurality of sub-fingerprint data.
Specifically, the second antenna gain may be an antenna gain of a specific antenna, and the specific antenna is selected according to a specific situation in a field, which is not specifically limited in the present invention. The gain of the antenna is used for measuring the ability of the antenna to transmit and receive signals towards a specific direction, quantitatively describes the degree of concentrated radiation of input power by the antenna, and is one of the most important parameters for selecting the base station antenna; the RSSI value indicates the strength of a signal received by a receiving end, and the strength of the signal has a certain relationship with the distance between the transmitting end and the receiving end (as shown in the following text formula), so that the distance between the signal and a receiving point is measured according to the strength of the received signal, and therefore, the gain of the antenna has a corresponding relationship with the RSSI value of the antenna.
In addition, the following formula is satisfied between the antenna and the client:
PRx＝PTX+GTX+GRX-L formula (1);
wherein, PTXIs the transmit power of the antenna; pRXIs the received power of the antenna; gTXIs an angle-related quantity; gRXIs a parameter of the client, which is irrelevant to the antenna of the transmitting end; l is a function of distance; since the transmit power is fixed, the RSSI difference is equal to GTXThe difference of (a). Therefore, the difference between the gains and the RSSI difference at the time of positioning have a theoretical equivalent relationship, so that the difference between the gains has significance as a fingerprint feature.
In another practical implementation manner, the present invention further provides another method for generating a fingerprint library, where the method for generating a fingerprint library includes:
s31, acquiring preset signal values of the detected antennas;
and S32, acquiring the difference value of each detected preset signal value and the designated signal value as sub-fingerprint data of the current antenna to generate a fingerprint database containing a plurality of sub-fingerprint data.
Specifically, the designated signal value may be an RSSI value corresponding to a designated antenna, and the designated antenna is selected according to a specific situation in a field, which is not specifically limited in the present invention. Each sub-fingerprint data represents the signal value difference between the current antenna and the appointed antenna, and for a single antenna, the fingerprint has the characteristic of an angle dimension, namely, each sub-fingerprint data comprises an angle and fingerprint details corresponding to the angle. Furthermore, the process of steps S31-S32 needs to be guaranteed to be in an ideal open environment (no occlusion, no emission environment), so that the obtained data has higher reliability.
In specific implementation, firstly, performing difference operation on each acquired preset signal value and a specified signal value to generate a positioning physical quantity; secondly, searching a plurality of sub-fingerprint data with the minimum difference value with the positioning physical quantity in a preset fingerprint database; and finally, acquiring angle information of the antenna corresponding to each sub-fingerprint data, drawing direction lines of the antenna based on the angle information, and acquiring positioning information of which the intersection point of the direction lines is the current position.
Compared with the prior art, the positioning method based on the antenna direction characteristic solves the problem that the positioning accuracy is poor due to the fact that the RSSI absolute value is directly used as the positioning information in the prior art. And high positioning precision can be still kept when an object is shielded.
Example two
Referring to fig. 3, fig. 3 is a schematic structural diagram of a positioning apparatus 10 based on antenna directional characteristics according to an embodiment of the present invention; the method comprises the following steps:
a signal value detection unit 11, configured to obtain a detected preset signal value; the preset signal value is an RSSI value corresponding to the antenna;
a positioning physical quantity generating unit 12, configured to perform a difference operation on each detected preset signal value and a specified signal value, so as to generate a positioning physical quantity;
a sub-fingerprint data searching unit 13, configured to search, in a preset fingerprint database, a plurality of sub-fingerprint data having a minimum difference value from the positioning physical quantity; wherein, each sub-fingerprint data has the angle information of the corresponding antenna;
a direction line obtaining unit 14, configured to obtain angle information of an antenna corresponding to each piece of sub-fingerprint data, and draw a direction line of the antenna corresponding to each piece of sub-fingerprint data based on the angle information;
and a positioning information obtaining unit 15, configured to obtain positioning information in which an intersection of the direction lines is a current position.
It should be noted that the positioning apparatus 10 according to the embodiment of the present invention may be a mobile terminal, and the mobile terminal may be a mobile phone, a tablet computer, or another mobile terminal capable of implementing a positioning function. In the embodiment of the invention, a plurality of antennas are arranged in a certain programmable range for transmitting signals, each antenna transmits the signals according to the same period, and the transmitted signals have equal strength. When a user holds the mobile terminal by hand and enters the signal range of the antenna, the positioning function can be started to be realized.
Preferably, the selected antenna operates in a WiFi mode or a bluetooth mode. When the antenna works in a WiFi mode, the antenna transmits WiFi signals; when the antenna is operating in a bluetooth mode, the antenna transmits bluetooth signals.
Specifically, the signal value detecting unit 11 detects preset signal values at a current position in a set frequency band, for example, the frequency band is a 2.4G frequency band, a 5G band1 frequency band, and a 5G band4 frequency band, and obtains the detected preset signal values of all the antennas in the current frequency band.
Specifically, the absolute value of the RSSI changes greatly when the object is blocked, but since the attenuation of the same barrier to each antenna of the same AP is consistent, the relative value of the RSSI (i.e., the fingerprint of the antenna directional characteristic) between different antennas is kept unchanged. With this information, the inherent disadvantage of using the absolute value of RSSI as positioning information can be avoided. That is, the preset signal value of each antenna is obtained at this time, the positioning physical quantity generating unit 12 performs a difference operation on all the preset signal values and the specified signal value to generate a positioning physical quantity, where the positioning physical quantity includes a set of physical quantity data.
Specifically, the sub-fingerprint data searching unit 13 searches a plurality of sub-fingerprint data with the smallest difference value with the positioning physical quantity in a preset fingerprint database; the fingerprint database comprises a plurality of sub-fingerprint data, and each sub-fingerprint data has angle information of an antenna corresponding to the sub-fingerprint data. That is, the positioning physical quantity is compared with sub-fingerprint data in the fingerprint database (the sub-fingerprint data is also a difference between signal values of all antennas detected at a certain position and a designated signal value sent by a designated antenna, and is also a set of physical quantity data) one by one, and the sub-fingerprint data with the minimum difference between the two sets of data is found out.
Specifically, the direction line obtaining unit 14 obtains angle information of an antenna corresponding to each sub-fingerprint data, and draws a direction line of the antenna corresponding to each sub-fingerprint data based on the angle information; finally, the positioning information obtaining unit 15 obtains the positioning information of the current position, which is the intersection of the direction lines. That is, the user may be at/close to the intersection of the direction lines, and the geographical location information of the intersection of the direction lines may be used as the location of the current user.
In an implementation manner, the present invention further provides a method for generating a fingerprint database, where the method for generating a fingerprint database includes:
s21, calculating first antenna gains of the detected antennas;
and S22, acquiring the difference value between the first antenna gain and the preset second antenna gain as sub-fingerprint data of the current antenna to generate a fingerprint database containing a plurality of sub-fingerprint data.
Specifically, the second antenna gain may be an antenna gain of a specific antenna, and the specific antenna is selected according to a specific situation in a field, which is not specifically limited in the present invention. The gain of the antenna is used for measuring the ability of the antenna to transmit and receive signals towards a specific direction, quantitatively describes the degree of concentrated radiation of input power by the antenna, and is one of the most important parameters for selecting the base station antenna; the RSSI value indicates the strength of a signal received by a receiving end, and the strength of the signal has a certain relationship with the distance between the transmitting end and the receiving end (as shown in the following text formula), so that the distance between the signal and a receiving point is measured according to the strength of the received signal, and therefore, the gain of the antenna has a corresponding relationship with the RSSI value of the antenna.
In addition, the following formula is satisfied between the antenna and the client:
PRX＝PTX+GTX+GRX-L formula (1);
wherein, PTXIs the transmit power of the antenna; pRXIs the received power of the antenna; gTXIs an angle-related quantity; gRXIs a parameter of the client, which is irrelevant to the antenna of the transmitting end; l is a function of distance; since the transmit power is fixed, the RSSI difference is equal to GTXThe difference of (a). Therefore, the difference between the gains and the RSSI difference at the time of positioning have a theoretical equivalent relationship, so that the difference between the gains has significance as a fingerprint feature.
In another practical implementation manner, the present invention further provides another method for generating a fingerprint library, where the method for generating a fingerprint library includes:
s31, acquiring preset signal values of the detected antennas;
and S32, acquiring the difference value of each detected preset signal value and the designated signal value as sub-fingerprint data of the current antenna to generate a fingerprint database containing a plurality of sub-fingerprint data.
Specifically, the designated signal value may be an RSSI value corresponding to a designated antenna, and the designated antenna is selected according to a specific situation in a field, which is not specifically limited in the present invention. Each sub-fingerprint data represents the signal value difference between the current antenna and the appointed antenna, and for a single antenna, the fingerprint has the characteristic of an angle dimension, namely, each sub-fingerprint data comprises an angle and fingerprint details corresponding to the angle. Furthermore, the process of steps S31-S32 needs to be guaranteed to be in an ideal open environment (no occlusion, no emission environment), so that the obtained data has higher reliability.
In specific implementation, firstly, the positioning physical quantity generating unit performs difference operation on each preset signal value acquired by the signal value detecting unit and the specified signal value to generate a positioning physical quantity; secondly, the sub-fingerprint data searching unit searches a plurality of sub-fingerprint data with the minimum difference value with the positioning physical quantity in a preset fingerprint database; and finally, the direction line acquisition unit acquires angle information of the antenna corresponding to each piece of sub-fingerprint data, draws direction lines of the antenna based on the angle information, and the positioning information acquisition unit acquires positioning information of which the intersection point of the direction lines is the current position.
Compared with the prior art, the positioning device 10 based on the antenna direction characteristic solves the problem that the positioning accuracy is poor due to the fact that the RSSI absolute value is directly used as the positioning information in the prior art. And high positioning precision can be still kept when an object is shielded.
EXAMPLE III
Referring to fig. 4, fig. 4 is a schematic structural diagram of a positioning system 20 based on antenna direction characteristics according to an embodiment of the present invention; the positioning system 20 based on antenna direction characteristics includes several antennas 21 and the positioning device 10 based on antenna direction characteristics described in the second embodiment.
For the specific working process of the antenna 21 and the positioning apparatus 10 based on the antenna directional characteristic, please refer to the specific working process of the positioning apparatus 10 based on the antenna directional characteristic described in the second embodiment, which is not described herein again.
Compared with the prior art, the positioning system 20 based on the antenna direction characteristic disclosed by the invention firstly performs difference operation on each acquired preset signal value and the appointed signal value to generate the positioning physical quantity; secondly, searching a plurality of sub-fingerprint data with the minimum difference value with the positioning physical quantity in a preset fingerprint database; and finally, acquiring angle information of the antenna corresponding to each sub-fingerprint data, drawing direction lines of the antenna 21 based on the angle information, and acquiring positioning information of which the intersection points of the direction lines are the current positions.
The positioning system 20 based on the antenna direction characteristics disclosed by the invention solves the problem of poor positioning accuracy caused by directly using the RSSI absolute value as positioning information in the prior art. And high positioning precision can be still kept when an object is shielded.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A positioning method based on antenna direction characteristics is characterized by comprising the following steps:
acquiring a detected preset signal value; the preset signal value is an RSSI value corresponding to the antenna;
carrying out difference operation on each detected preset signal value and an appointed signal value to generate a positioning physical quantity; the designated signal value is an RSS I value corresponding to a designated antenna;
searching a plurality of sub-fingerprint data with the minimum difference value with the positioning physical quantity in a preset fingerprint database; each sub-fingerprint data has angle information of an antenna corresponding to the sub-fingerprint data, and the fingerprint database is constructed by RSS I values or antenna gains;
acquiring angle information of an antenna corresponding to each sub-fingerprint data, and drawing a direction line of the antenna corresponding to each sub-fingerprint data based on the angle information;
and acquiring positioning information of the current position of the intersection point of the direction lines.
2. The antenna direction characteristic-based positioning method according to claim 1, wherein the fingerprint library generation method comprises:
calculating first antenna gains of the detected antennas;
and acquiring a difference value between the first antenna gain and a preset second antenna gain as sub-fingerprint data of the current antenna to generate a fingerprint database containing a plurality of sub-fingerprint data.
3. The antenna direction characteristic-based positioning method according to claim 1, wherein the fingerprint library generation method comprises:
acquiring preset signal values of a plurality of detected antennas;
and acquiring the difference value of each detected preset signal value and the appointed signal value as sub-fingerprint data of the current antenna so as to generate a fingerprint database containing a plurality of sub-fingerprint data.
4. The antenna direction characteristic-based positioning method according to claim 1, wherein the antenna operates in a WiFi mode or a bluetooth mode.
5. A positioning device based on antenna directional characteristics, comprising:
the signal value detection unit is used for acquiring a detected preset signal value; the preset signal value is an RSSI value corresponding to the antenna;
the positioning physical quantity generating unit is used for carrying out difference operation on each detected preset signal value and a specified signal value to generate a positioning physical quantity; the designated signal value is an RSSI value corresponding to a designated antenna;
the sub-fingerprint data searching unit is used for searching a plurality of sub-fingerprint data with the minimum difference value with the positioning physical quantity in a preset fingerprint database; each sub-fingerprint data has angle information of the corresponding antenna, and the fingerprint database is constructed by RSSI values or antenna gains;
the direction line obtaining unit is used for obtaining angle information of an antenna corresponding to each sub-fingerprint data and drawing a direction line of the antenna corresponding to each sub-fingerprint data based on the angle information;
and the positioning information acquisition unit is used for acquiring the positioning information of which the intersection point of the direction lines is the current position.
6. The antenna direction characteristic-based positioning device according to claim 5, wherein the fingerprint library generation method comprises:
calculating first antenna gains of the detected antennas;
and acquiring a difference value between the first antenna gain and a preset second antenna gain as sub-fingerprint data of the current antenna to generate a fingerprint database containing a plurality of sub-fingerprint data.
7. The antenna direction characteristic-based positioning device according to claim 5, wherein the fingerprint library generation method comprises:
acquiring preset signal values of a plurality of detected antennas;
and acquiring the difference value of each detected preset signal value and the appointed signal value as sub-fingerprint data of the current antenna so as to generate a fingerprint database containing a plurality of sub-fingerprint data.
8. The antenna directivity characteristic-based positioning device of claim 5, wherein the antenna operates in a WiFi mode or a Bluetooth mode.
9. A positioning system based on antenna direction characteristics, which is characterized by comprising a plurality of antennas and the positioning device based on antenna direction characteristics as claimed in any one of the claims 5-8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910131353.8A CN109982306B (en) | 2019-02-22 | 2019-02-22 | Positioning method, device and system based on antenna direction characteristics |
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| CN201910131353.8A CN109982306B (en) | 2019-02-22 | 2019-02-22 | Positioning method, device and system based on antenna direction characteristics |
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| CN109982306A CN109982306A (en) | 2019-07-05 |
| CN109982306B true CN109982306B (en) | 2022-03-08 |
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