CN103607493B - The correction for direction method of smart mobile phone - Google Patents
The correction for direction method of smart mobile phone Download PDFInfo
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- CN103607493B CN103607493B CN201310626658.9A CN201310626658A CN103607493B CN 103607493 B CN103607493 B CN 103607493B CN 201310626658 A CN201310626658 A CN 201310626658A CN 103607493 B CN103607493 B CN 103607493B
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Abstract
The correction for direction method of smart mobile phone, relates to a kind of bearing calibration.In order to solve current smart mobile phone when perceived direction, cannot modifying factor self attitude and the error caused, the error caused due to geographical position cannot be revised, cause the problem that orientation measurement precision is low.It comprises the steps: step one: the communication system in positioning system services district periodically broadcasts magnetic declination θ and the magnetic dip angle of described service area
step 2: smart mobile phone to be corrected is according to the magnetic declination θ received and magnetic dip angle
in conjunction with the mobile phone inclination alpha that the gravity sensor of described smart mobile phone to be corrected obtains, revise direction measurement ρ and obtain the revised deflection Ω of smart mobile phone to be corrected.The present invention is applicable in the fingerprint location system of smart mobile phone.
Description
Technical field
The present invention relates to a kind of bearing calibration, particularly a kind of correction for direction method of smart mobile phone.
Background technology
Along with people improve gradually to the demand of the service (LBS) of position-based information, stationkeeping ability has become part indispensable in intelligent mobile phone terminal.And in smart mobile phone, the directional information needed for location navigation is gathered by electronic compass.
Electronic compass is by magnetometric sensor, to carry out work by perception magnetic field of the earth.The measurement result in magnetic field of the earth is described by geomagnetic element (north orientation intensity, east orientation intensity, vertical intensity, magnetic declination, magnetic dip angle, absolute force and horizontal intensity) usually, and electronic compass is carry out perceived direction by the angle between perception terminal and horizontal intensity.
And the attitude of user's handheld terminal has great uncertainty, this can make smart mobile phone can introduce the error caused by mobile phone attitude (as pitching) when measurement direction.
In addition, the magnetic declination in earth magnetic field and magnetic dip angle are different because of different geographical position, as depicted in figs. 1 and 2.
Magnetic declination should be revised according to place to use difference, and when magnetic compass inclined work, the impact of magnetic dip angle must take in.Due to the uncertainty of smart mobile phone on place to use, above-mentioned 2 is all not available for intelligent mobile phone terminal.
To sum up, current smart mobile phone, cannot modifying factor self attitude and the error caused when perceived direction, cannot revise the error caused due to geographical position.
Summary of the invention
The object of the invention is to solve current smart mobile phone when perceived direction, cannot modifying factor self attitude and the error caused, the error caused due to geographical position cannot be revised, cause the problem that orientation measurement precision is low, the invention provides a kind of correction for direction method of smart mobile phone.
The correction for direction method of smart mobile phone of the present invention, it comprises the steps:
Step one: the communication system in positioning system services district periodically broadcasts magnetic declination θ and the magnetic dip angle of described service area
Step 2: smart mobile phone to be corrected is according to the magnetic declination θ received and magnetic dip angle
in conjunction with the mobile phone inclination alpha that the gravity sensor of described smart mobile phone to be corrected obtains, revise direction measurement ρ and obtain the revised deflection Ω of smart mobile phone to be corrected.
The invention has the advantages that, ground magnetic characteristic is utilized to change little feature among a small circle, corresponding update information is sent to smart mobile phone by communication system, to correct the measure error of gravity sensor in smart mobile phone, the accuracy of method of the present invention orientation measurement compared with existing mobile phone direction measurement method can obtain the correction of about 10 degree.
Accompanying drawing explanation
Isogonic geomagnetic chart when Fig. 1 is different geographical position, the magnetic declination place in earth magnetic field.
Isoclinic angle geomagnetic chart when Fig. 2 is different geographical position, the magnetic dip angle place in earth magnetic field.Wherein N represents north, direction, and S represents south, direction, and W represents west, direction, and E represents east, direction.
Fig. 3 is the schematic flow sheet of the correction for direction method of the smart mobile phone described in embodiment one.
Embodiment
Embodiment one: composition graphs 3 illustrates present embodiment, the correction for direction method of the smart mobile phone described in present embodiment, it comprises the steps:
Step one: the communication system in positioning system services district periodically broadcasts magnetic declination θ and the magnetic dip angle of described service area
Step 2: smart mobile phone to be corrected is according to the magnetic declination θ received and magnetic dip angle
in conjunction with the mobile phone inclination alpha that the gravity sensor of described smart mobile phone to be corrected obtains, revise direction measurement ρ and obtain the revised deflection Ω of smart mobile phone to be corrected.
Embodiment two: present embodiment is the further restriction of the correction for direction method to the smart mobile phone described in embodiment one,
Smart mobile phone to be corrected in described step 2 is according to the magnetic declination θ received and magnetic dip angle
in conjunction with the mobile phone inclination alpha that the gravity sensor of described smart mobile phone to be corrected obtains, revise direction measurement ρ, the method obtaining the revised deflection Ω of smart mobile phone to be corrected is:
First, according to formula
try to achieve y;
Described y is the corrected value that the gravity sensor of smart mobile phone to be corrected measures the magnetometric sensor registration of y-axis in plane right-angle coordinate when inclination angle is 0,
The gravity sensor that described y ' is smart mobile phone to be corrected measures inclination angle
time in plane right-angle coordinate the magnetometric sensor registration of y-axis,
Described x is the corrected value that the gravity sensor of smart mobile phone to be corrected measures the magnetometric sensor registration of x-axis in plane right-angle coordinate when inclination angle is 0, described x=x ';
The gravity sensor that described x ' is smart mobile phone to be corrected measures inclination angle
time in plane right-angle coordinate the magnetometric sensor registration of x-axis,
Then, direction measurement is: ρ=arctan (x/y); Described direction measurement ρ is the horizontal sextant angle of magnetic induction line and smart mobile phone to be corrected;
Finally, revised deflection is obtained after being compensated by magnetic declination θ: Ω=ρ-θ.
According to the use habit of user, give tacit consent to smart mobile phone to be corrected to rotate around x-axis, so the gravity sensor of smart mobile phone to be corrected to measure when inclination angle is not 0 the magnetometric sensor registration that gravity sensor that the magnetometric sensor registration of x-axis in plane right-angle coordinate equals smart mobile phone to be corrected measures x-axis in plane right-angle coordinate when inclination angle is 0.
Embodiment three: present embodiment is the further restriction of the correction for direction method to the smart mobile phone described in embodiment one or two, and the communication system described in step one is the communication system of mobile base station or navigation system itself.
Embodiment four: present embodiment is the further restriction of the correction for direction method to the smart mobile phone described in embodiment one,
Smart mobile phone to be corrected in described step 3 is according to the magnetic declination θ received and magnetic dip angle
in conjunction with the mobile phone inclination alpha that the gravity sensor of described smart mobile phone to be corrected obtains, revise direction measurement ρ, the method obtaining the revised deflection Ω of smart mobile phone to be corrected is:
Smart mobile phone to be corrected is according to the magnetic declination θ received and magnetic dip angle
in conjunction with the mobile phone inclination alpha that the gravity sensor of described smart mobile phone to be corrected obtains, tabling look-up by contrasting with correction bearing data storehouse, revising direction measurement ρ, obtaining the revised deflection Ω of smart mobile phone to be corrected.
Described database is the magnetic declination θ, the magnetic dip angle that are obtained by lot of experiment validation
when being certain determined value with mobile phone inclination alpha, corresponding deflection Ω.
Embodiment five: present embodiment is the further restriction of the correction for direction method to the smart mobile phone described in embodiment one,
Described magnetic declination θ and magnetic dip angle
to table look-up acquisition according to international earth magnetism reference zone (IGRF).
The present invention is applicable in the fingerprint location system of smart mobile phone, if system can the information broadcasted of customized AP, is then outwards broadcasted when geomagnetic declination information by AP, and sensor error information in direction under different angle.Terminal by above-mentioned information correction self orientation measurement result, and is found corresponding fingerprint image carry out matching operation according to the directional information after correcting, and obtains positioning result.
GNSS navigation system, then by public mobile communications network broadcast corrections information.Several adjacent mobile communication base stations are one group, and by the mode of surfing Internet with cell phone, the control information that outwards broadcast is identical, user, by this information, revises the direction value in fingerprint location.
Claims (3)
1. the correction for direction method of smart mobile phone, it comprises the steps:
Step one: the communication system in positioning system services district periodically broadcasts magnetic declination θ and the magnetic dip angle of described service area
Step 2: smart mobile phone to be corrected is according to the magnetic declination θ received and magnetic dip angle
in conjunction with the mobile phone inclination alpha that the gravity sensor of described smart mobile phone to be corrected obtains, revise direction measurement ρ, obtain the revised deflection Ω of smart mobile phone to be corrected;
It is characterized in that, smart mobile phone to be corrected in described step 2 is according to the magnetic declination θ received and magnetic dip angle
in conjunction with the mobile phone inclination alpha that the gravity sensor of described smart mobile phone to be corrected obtains, revise direction measurement ρ, the method obtaining the revised deflection Ω of smart mobile phone to be corrected is:
First, according to formula
try to achieve y;
Described y is the corrected value that the gravity sensor of smart mobile phone to be corrected measures the magnetometric sensor registration of y-axis in plane right-angle coordinate when inclination angle is 0,
The gravity sensor that described y ' is smart mobile phone to be corrected measures inclination angle
time in plane right-angle coordinate the magnetometric sensor registration of y-axis,
Described x is the corrected value that the gravity sensor of smart mobile phone to be corrected measures the magnetometric sensor registration of x-axis in plane right-angle coordinate when inclination angle is 0, described x=x ';
The gravity sensor that described x ' is smart mobile phone to be corrected measures inclination angle
time in plane right-angle coordinate the magnetometric sensor registration of x-axis,
Then, direction measurement is: ρ=arctan (x/y); Described direction measurement ρ is the horizontal sextant angle of magnetic induction line and smart mobile phone to be corrected;
Finally, revised deflection is obtained after being compensated by magnetic declination θ: Ω=ρ-θ.
2. the correction for direction method of smart mobile phone according to claim 1, is characterized in that, the communication system described in step one is the communication system of mobile base station or navigation system itself.
3. the correction for direction method of smart mobile phone according to claim 1, is characterized in that, described magnetic declination θ and magnetic dip angle
to table look-up acquisition according to international earth magnetism reference zone (IGRF).
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| CN201310626658.9A CN103607493B (en) | 2013-11-29 | 2013-11-29 | The correction for direction method of smart mobile phone |
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| CN201310626658.9A CN103607493B (en) | 2013-11-29 | 2013-11-29 | The correction for direction method of smart mobile phone |
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| CN103607493B true CN103607493B (en) | 2016-03-23 |
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| CN106355647A (en) * | 2016-08-25 | 2017-01-25 | 北京暴风魔镜科技有限公司 | Augmented reality system and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1314015A (en) * | 1999-04-20 | 2001-09-19 | 皇家菲利浦电子有限公司 | Antenna direction finding in mobile phones |
| CN102238589A (en) * | 2011-07-04 | 2011-11-09 | 珠海世纪鼎利通信科技股份有限公司 | Wireless network communication base station antenna performance monitoring device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008020296A (en) * | 2006-07-12 | 2008-01-31 | Citizen Holdings Co Ltd | Azimuth sensor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1314015A (en) * | 1999-04-20 | 2001-09-19 | 皇家菲利浦电子有限公司 | Antenna direction finding in mobile phones |
| CN102238589A (en) * | 2011-07-04 | 2011-11-09 | 珠海世纪鼎利通信科技股份有限公司 | Wireless network communication base station antenna performance monitoring device |
Non-Patent Citations (1)
| Title |
|---|
| 电子磁罗盘航向角误差推导及分析;李艳等;《仪器仪表学报》;20130731;第34卷(第7期);第1566-1572页 * |
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