CN104459612A - Mobile terminal with function of measuring distance and direction of wifi equipment - Google Patents

Mobile terminal with function of measuring distance and direction of wifi equipment Download PDF

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Publication number
CN104459612A
CN104459612A CN201410693509.9A CN201410693509A CN104459612A CN 104459612 A CN104459612 A CN 104459612A CN 201410693509 A CN201410693509 A CN 201410693509A CN 104459612 A CN104459612 A CN 104459612A
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CN
China
Prior art keywords
distance
mobile terminal
wifi equipment
wifi
function
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201410693509.9A
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Chinese (zh)
Inventor
余峰
吴纯彬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan Changhong Electric Co Ltd
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Sichuan Changhong Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sichuan Changhong Electric Co Ltd filed Critical Sichuan Changhong Electric Co Ltd
Priority to CN201410693509.9A priority Critical patent/CN104459612A/en
Publication of CN104459612A publication Critical patent/CN104459612A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
    • G01S3/14—Systems for determining direction or deviation from predetermined direction
    • G01S3/46—Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems
    • 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
    • G01S5/04—Position of source determined by a plurality of spaced direction-finders

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The invention relates to the technology of positioning, in particular to a mobile terminal with the function of measuring the distance and the direction of wifi equipment. The mobile terminal with the function of measuring the distance and the direction of the wifi equipment comprises a mobile terminal body which has the wireless communication function and further comprises three ranging antennas and a phase discrimination ranging module, the ranging antennas are located on the same horizontal plane and used for measuring the distance with the wifi equipment, and the phase discrimination ranging module is used for obtaining the distance and the direction of the wifi equipment relative to the mobile terminal body by calculating the phase difference and the radio frequency carrier frequency of the wifi signals which are received at the same moment by the ranging antennas. The mobile terminal is suitable for measuring the distance and the direction between the mobile terminal and the wifi equipment.

Description

Possesses the mobile terminal measured with wifi equipment distance and direction function
Technical field
The present invention relates to location technology, particularly a kind of possess the mobile terminal measured with wifi equipment distance and direction function.
Background technology
At present in the epoch of Internet of Things and O2O day by day ripe and widespread use, more and more higher to the convenience of mobile terminal positioning technology demand, accuracy requirement.But there is the larger major defect of error in the technology utilizing WiFi signal intensity to carry out mobile terminal indoor positioning at present.The good positioning error level of current control is roughly at about 1 meter, and common error range is at 3 meters-9 meters.Router---the technology of GPS co-located, to the place that indoor GPS cannot cover, such as basement, comparatively closed indoor environment, known nearest router position can only be leaned on to estimate, positioning error is also larger.
Summary of the invention
The object of this invention is to provide a kind of mobile terminal accurately can measuring distance between wifi equipment and direction.
Provided by the invention possess the mobile terminal measured with wifi equipment distance and direction function, comprise terminal body, described terminal body possesses radio communication function, also comprise at least 3 telemetry antennas and phase demodulation distance-finding module, described telemetry antenna is positioned in same level, for measuring the distance between wifi equipment, the phase differential of the wifi signal that described phase demodulation distance-finding module receives at synchronization according to each telemetry antenna and radio frequency carrier frequency calculate the Distance geometry direction of wifi equipment relative to terminal body.
A kind of concrete scheme is, described phase demodulation distance-finding module is phase detector.
Particularly, the quantity of described telemetry antenna is 3.
Preferably, described 3 telemetry antennas are arranged at and are parallel on any three summits of mobile terminal display screen curtain.
Particularly, described mobile terminal is smart mobile phone or panel computer.
The invention has the beneficial effects as follows: mobile terminal of the present invention can accurately measure and wifi equipment, such as, distance between router and direction.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the space coordinates that the telemetry antenna of the mobile terminal of embodiment and wifi equipment antenna form.
Embodiment
Below in conjunction with drawings and Examples, technical scheme of the present invention is further described, it should be noted that embodiment is only used to help reader to understand technical scheme of the present invention design better, not in order to limit the protection domain of the claims in the present invention.
The invention provides a kind of mobile terminal possessing measurement and wifi equipment distance and direction function, comprise terminal body, described terminal body possesses radio communication function, also comprise at least 3 telemetry antennas and phase demodulation distance-finding module, described telemetry antenna is positioned in same level, for measuring the distance between wifi equipment, the phase differential of the wifi signal that described phase demodulation distance-finding module receives at synchronization according to each telemetry antenna and radio frequency carrier frequency calculate the Distance geometry direction of wifi equipment relative to terminal body.
Embodiment
Below for 3 telemetry antennas, the range finder orientation method of mobile terminal of the present invention is described in detail.The flow process that mobile terminal carries out range finding directed comprises the following steps:
1, on mobile terminals, configure that minimum 3 tunnels interfix, independently telemetry antenna; Can think that these telemetry antennas are in same plane, regard reference surface as this plane, and set up reference coordinate space, the volume coordinate schematic diagram formed between telemetry antenna and the antenna of wifi equipment as shown in Figure 1 near-sightedly.
2, the radiofrequency signal simultaneously sent from WiFi, after the propagation in different path, space, arrives each independently telemetry antenna on mobile terminal.Because propagation distance is different, the radiofrequency signal that each telemetry antenna receives can produce phase differential.3, known mobile terminal telemetry antenna point is A, B, C 3 point, for ease of analyzing, and A point and true origin coincidence.Angle between Distance geometry between 3 three limits is all known quantity, AB=S1, AC=S2, BC=S3, ∠ A=α, ∠ B=β.Then B point coordinate (S1,0), C point coordinate (S2*COS α, S2*SIN α).There is following care S2*COS α+S3*COS β=S1, S2*SIN α=S3*SIN β.The volume coordinate of spatial point WiFi antenna D is (x, y, z), and the subpoint that it projects to ABC plane is E, and coordinate is (x, y).WiFi antenna transmission o'clock is DA, DB, DC to the rectilinear propagation distance of 3 telemetry antennas.According to geometrical principle, so following equation can be listed:
DA＝SQR(EA 2+ED 2)＝SQR((X 2+Y 2)+Z 2)
DC＝SQR(EC 2+ED 2)＝SQR((X-S2*COSα) 2+(Y-S2*SINα) 2+Z 2)
DB＝SQR(EB 2+ED 2)＝SQR((X-S1) 2+Y 2+Z 2)
3, phase demodulation distance-finding module work principle, the signal that certain moment WiFi sends is received by telemetry antenna, the phase differential of these signals is compared simultaneously, phase differential △ θ can be recorded, with reference to radio frequency carrier frequency fc, convert and obtain travel path time difference progressive error △ t=△ θ/fc, this can obtain propagating progressive error is △ L=△ t*C, (C is the aerial velocity of propagation of electromagnetic wave, is constant 300000Km/S).By this, can DA be obtained, the progressive error of DC, DB:
△L1＝DA-DC＝SQR((X 2+Y 2)+Z 2)-SQR((X-S2*COSα) 2+(Y-S2*SINα) 2+Z 2)
△L2＝DA-DB＝SQR((X 2+Y 2)+Z 2)-SQR((X-S1) 2+Y 2+Z 2)
△L3＝DC-DB＝SQR((X-S2*COSα) 2+(Y-S2*SINα) 2+Z 2)-SQR((X-S1) 2+Y 2+Z 2)
4, system of equations can solve the coordinate (x, y, z) of D thus, can in the hope of the Distance geometry direction of WiFi equipment relative to 3 telemetry antenna coordinate systems.Current disclosed phase detector, the stroke time difference precision measured is the highest can reach for 0.1 nanosecond, and forming mistake difference can reach micron accuracies, and the precision of finding range thus can be very accurate.

Claims (5)

1. possesses the mobile terminal measured with wifi equipment distance and direction function, comprise terminal body, described terminal body possesses radio communication function, it is characterized in that, also comprise at least 3 telemetry antennas and phase demodulation distance-finding module, described telemetry antenna is positioned in same level, for measuring the distance between wifi equipment, the phase differential of the wifi signal that described phase demodulation distance-finding module receives at synchronization according to each telemetry antenna and radio frequency carrier frequency calculate the Distance geometry direction of wifi equipment relative to terminal body.
2. possess the mobile terminal measured with wifi equipment distance and direction function as claimed in claim 1, it is characterized in that, described phase demodulation distance-finding module is phase detector.
3. possess the mobile terminal measured with wifi equipment distance and direction function as claimed in claim 1 or 2, it is characterized in that, the quantity of described telemetry antenna is 3.
4. possess the mobile terminal measured with wifi equipment distance and direction function as claimed in claim 3, it is characterized in that, described 3 telemetry antennas are arranged on any three summits of the display screen being parallel to terminal body.
5. possess the mobile terminal measured with wifi equipment distance and direction function as claimed in claim 1, it is characterized in that, described mobile terminal is smart mobile phone or panel computer.
CN201410693509.9A 2014-11-26 2014-11-26 Mobile terminal with function of measuring distance and direction of wifi equipment Pending CN104459612A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410693509.9A CN104459612A (en) 2014-11-26 2014-11-26 Mobile terminal with function of measuring distance and direction of wifi equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410693509.9A CN104459612A (en) 2014-11-26 2014-11-26 Mobile terminal with function of measuring distance and direction of wifi equipment

Publications (1)

Publication Number Publication Date
CN104459612A true CN104459612A (en) 2015-03-25

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017088591A1 (en) * 2015-11-27 2017-06-01 上海斐讯数据通信技术有限公司 Wireless access point apparatus, and method and system for positioning terminal
WO2018053676A1 (en) * 2016-09-21 2018-03-29 东莞华南设计创新院 Wifi positioning method and system thereof, having non-planar mimo antenna

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1137662A (en) * 1995-02-21 1996-12-11 Gec阿尔斯托姆运输公司 Locating device for vehicle running along electromagnetic wave transmission device
CN102043151A (en) * 2009-10-19 2011-05-04 中兴通讯股份有限公司 Mobile terminal and method for positioning based on radio frequency identification
WO2011140308A1 (en) * 2010-05-06 2011-11-10 Digi International Inc. Signal phase-based location of network nodes
CN102460202A (en) * 2009-05-27 2012-05-16 首尔大学校产学协力团 Positioning system and method based on radio communication apparatus comprising multiple antenna
CN103176165A (en) * 2011-12-20 2013-06-26 北京北大千方科技有限公司 Vehicle-mounted unit positioning device and method
US20130250791A1 (en) * 2010-11-02 2013-09-26 Diani Systems, Inc. Indoor Positioning System for Standards-Based Narrowband mobile Radios Using Spectrally Overlapping Transmissions
US20140185464A1 (en) * 2012-12-27 2014-07-03 Lei Yang Systems and Methods for Reducing Variations in Received Signal Strength Indicator (RSSI) Measurements for Location Sensing

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1137662A (en) * 1995-02-21 1996-12-11 Gec阿尔斯托姆运输公司 Locating device for vehicle running along electromagnetic wave transmission device
CN102460202A (en) * 2009-05-27 2012-05-16 首尔大学校产学协力团 Positioning system and method based on radio communication apparatus comprising multiple antenna
CN102043151A (en) * 2009-10-19 2011-05-04 中兴通讯股份有限公司 Mobile terminal and method for positioning based on radio frequency identification
WO2011140308A1 (en) * 2010-05-06 2011-11-10 Digi International Inc. Signal phase-based location of network nodes
US20130250791A1 (en) * 2010-11-02 2013-09-26 Diani Systems, Inc. Indoor Positioning System for Standards-Based Narrowband mobile Radios Using Spectrally Overlapping Transmissions
CN103176165A (en) * 2011-12-20 2013-06-26 北京北大千方科技有限公司 Vehicle-mounted unit positioning device and method
US20140185464A1 (en) * 2012-12-27 2014-07-03 Lei Yang Systems and Methods for Reducing Variations in Received Signal Strength Indicator (RSSI) Measurements for Location Sensing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017088591A1 (en) * 2015-11-27 2017-06-01 上海斐讯数据通信技术有限公司 Wireless access point apparatus, and method and system for positioning terminal
WO2018053676A1 (en) * 2016-09-21 2018-03-29 东莞华南设计创新院 Wifi positioning method and system thereof, having non-planar mimo antenna

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Application publication date: 20150325