CN104053230A - Distance measurement method based on Bluetooth protocol - Google Patents
Distance measurement method based on Bluetooth protocol Download PDFInfo
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- CN104053230A CN104053230A CN201410244131.4A CN201410244131A CN104053230A CN 104053230 A CN104053230 A CN 104053230A CN 201410244131 A CN201410244131 A CN 201410244131A CN 104053230 A CN104053230 A CN 104053230A
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Abstract
The invention discloses a distance measurement method based on a Bluetooth protocol. An RSSI(Received Signal Strength Indication) value during interaction of master Bluetooth equipment and slave Bluetooth equipment is obtained, after data mining, a final RSSI value is substituted into a decline model of RSSI and a distance, and the distance d is obtained. According to the distance measurement method based on the Bluetooth protocol, a data mining technology is adopted to eliminate interference of multipath effects in the RSSI value, and distance measurement precision is improved greatly; the distance measurement method based on the Bluetooth protocol makes up for the deficiency of a short range distance measurement function of an existing distance measurement device, and the precision in short range distance measurement can be controlled within 8 cm.
Description
Technical field
The present invention relates to a kind of distance-finding method based on Bluetooth protocol.
Background technology
As everyone knows, the device of using rfid technology measuring distance has a variety of.As the GPS navigation system that everybody is familiar with, the inside has just been applied to ranging technology; Certainly, the range unit of application Bluetooth protocol exists equally.Their general principle is the RSSI value while utilizing bluetooth equipment slave mutual, and the decline model of application RSSI value and distance draws distance thereby convert.But GPS localization method is not suitable for indoor range finding, range accuracy is very poor; And part bluetooth range unit application is the bluetooth protocol version (bluetooth 3.0 versions and following) before 2010, no longer applicable, and they have common shortcoming: positioning precision is poor, closely distance measurement function disappearance.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, a kind of distance-finding method based on Bluetooth protocol is provided.
The object of the invention is to be achieved through the following technical solutions: a kind of distance-finding method based on Bluetooth protocol, the method realizes in the ranging system based on Bluetooth protocol, described ranging system comprises single-chip microcomputer, the first bluetooth module and Android system smart mobile phone, described Android system smart mobile phone has the second bluetooth module, and the method comprises the following steps:
(1) the first bluetooth module is set is visible state to single-chip microcomputer, and the first bluetooth module transmits;
(2) Android system smart mobile phone receives by the second bluetooth module on mobile phone the signal that the first bluetooth module sends;
(3) the signal receiving from the second bluetooth module, extract RSSI value;
(4) the RSSI value of extraction is made as to initial set, then applies K-means clustering algorithm and eliminate the interference of multipath effect to RSSI value, the RSSI value being eliminated after disturbing;
(5) in the middle of RSSI value substitution RSSI step (4) being obtained and the decline model of distance, thereby try to achieve apart from d, the decline model of described RSSI and distance is:
；
Described decline model
in A be the distance of the first bluetooth module and the Android system smart mobile phone signal receiving strength while being 1 meter,
for the signal parameter factor, A with
obtain in the following manner:
(5.1) single-chip microcomputer and the first bluetooth module are placed in apart from Android system smart mobile phone 1m, 2m, 3m, 4m, 5m, 6m, 7m place; It is visible state that single-chip microcomputer arranges the first bluetooth module, and the first bluetooth module transmits at the 1m apart from Android system smart mobile phone, 2m, 3m, 4m, 5m, 6m, 7m place;
(5.2) repeating step (1)-(4), corresponding different distance obtains different RSSI values;
(5.3) corresponding 7 known distances in 7 RSSI values that obtain according to step (5.2) and step (1), by least square method, obtain, A with
.
The invention has the beneficial effects as follows, maintenance data digging technology, can eliminate the interference that multipath effect causes RSSI value effectively, thereby improves range accuracy.
Brief description of the drawings
Fig. 1 is the main modular of software;
Fig. 2 is experimental results figure.
Embodiment
A kind of distance-finding method based on Bluetooth protocol, the method realizes in the ranging system based on Bluetooth protocol, described ranging system comprises single-chip microcomputer, the first bluetooth module and Android system smart mobile phone, and described Android system smart mobile phone has the second bluetooth module, and the method comprises the following steps:
(1) ask for the decline model of RSSI and distance
in parameter factors A with
:
(1.1) single-chip microcomputer and the first bluetooth module are placed in to the place apart from Android system smart mobile phone 1m;
(1.2) the first bluetooth module is set is visible state to single-chip microcomputer, and the first bluetooth module is transmitting apart from Android system smart mobile phone 1m place;
(1.3) Android system smart mobile phone receives by the second bluetooth module on mobile phone the signal that the first bluetooth module sends;
(1.4) the signal receiving from the second bluetooth module, extract RSSI value;
(1.5) multiple RSSI values of extracting are made as to initial set, then apply K-means clustering algorithm and eliminate the interference of multipath effect to RSSI value, while obtaining distance for 1m, the RSSI value of eliminating after disturbing is-53.3dBm;
(1.6) single-chip microcomputer and the first bluetooth module are placed in apart from Android system smart mobile phone 2m, 3m, 4m, 5m, 6m, 7m place, repeating step (1.1)-(1.5), corresponding different distance obtains different RSSI values: the be followed successively by-60.4dBm of RSSI value when distance is 2m, 3m, 4m, 5m, 6m, 7m,-62.8dBm,-65.4dBm,-69.4dBm ,-72.6dBm ,-75.1dBm;
(1.7) corresponding 7 known distances in 7 RSSI values that obtain according to step (1.6) and step (1.1), by least square method, obtain, A=-52.4007 with
=2.4901.
(2) the first bluetooth module is placed in to testing distance place, it is visible state that single-chip microcomputer arranges the first bluetooth module, and the first bluetooth module transmits;
(3) Android system smart mobile phone receives by the second bluetooth module on mobile phone the signal that the first bluetooth module sends;
(4) in the signal that the second bluetooth module receives from step (3), extract RSSI value;
(5) the RSSI value of step (4) being extracted is made as initial set, then applies K-means clustering algorithm and eliminates the interference of multipath effect to RSSI value, the RSSI value being eliminated after disturbing;
(6) in the middle of RSSI value substitution RSSI step (5) being obtained and the decline model of distance, thereby try to achieve apart from d, the decline model of described RSSI and distance is:
；
In formula, A=-52.4007,
=2.4901.
As shown in Figure 2, the error between the method records distance d and actual range is in 8cm.
Claims (1)
1. the distance-finding method based on Bluetooth protocol, the method realizes in the ranging system based on Bluetooth protocol, described ranging system comprises single-chip microcomputer, the first bluetooth module and Android system smart mobile phone etc., described Android system smart mobile phone has the second bluetooth module, it is characterized in that, the method comprises the following steps:
(1) the first bluetooth module is set is visible state to single-chip microcomputer, and the first bluetooth module transmits;
(2) Android system smart mobile phone receives by the second bluetooth module on mobile phone the signal that the first bluetooth module sends;
(3) the signal receiving from the second bluetooth module, extract RSSI value;
(4) the RSSI value of extraction is made as to initial set, then applies K-means clustering algorithm and eliminate the interference of multipath effect to RSSI value, the RSSI value being eliminated after disturbing;
(5) in the middle of RSSI value substitution RSSI step (4) being obtained and the decline model of distance, thereby try to achieve apart from d;
The decline model of described RSSI and distance is
;
In formula, A is the signal receiving strength of the distance of the first bluetooth module and Android system smart mobile phone while being 1 meter,
for the signal parameter factor, A with
obtain in the following manner:
(5.1) single-chip microcomputer and the first bluetooth module are placed in apart from Android system smart mobile phone 1m, 2m, 3m, 4m, 5m, 6m, 7m place; It is visible state that single-chip microcomputer arranges the first bluetooth module, and the first bluetooth module transmits at the 1m apart from Android system smart mobile phone, 2m, 3m, 4m, 5m, 6m, 7m place;
(5.2) repeating step (1)-(4), corresponding different distance obtains different RSSI values;
(5.3) corresponding 7 known distances in 7 RSSI values that obtain according to step (5.2) and step (1), by least square method, obtain A with
.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407343A (en) * | 2014-12-01 | 2015-03-11 | 福建联迪商用设备有限公司 | Method and system for distance measurement by bluetooth |
| CN105425229A (en) * | 2015-11-02 | 2016-03-23 | 上海中船船舶设计技术国家工程研究中心有限公司 | Anti-collision monitoring device for lighter aboard ship |
| CN106443648A (en) * | 2015-08-13 | 2017-02-22 | 株式会社理光 | Method for judging approaching of electronic device and device thereof |
| CN106685543A (en) * | 2016-12-09 | 2017-05-17 | 广州视源电子科技股份有限公司 | Wireless signal detection method and device |
| CN106941692A (en) * | 2017-04-27 | 2017-07-11 | 北京爱康泰科技有限责任公司 | Test method, device and the storage medium of wireless device |
| CN107140549A (en) * | 2017-06-29 | 2017-09-08 | 上海海事大学 | Two-electron atom bridge crane pivot angle and rope length detection means and its measuring method |
| CN110231595A (en) * | 2019-05-28 | 2019-09-13 | 武汉盛硕电子有限公司 | A kind of method of bluetooth ranging, the test method of bluetooth equipment and system |
| CN111325880A (en) * | 2020-02-26 | 2020-06-23 | 广州市艾森斯软件研发有限公司 | Bluetooth-based positioning door opening method and device, intelligent terminal and storage medium |
| CN112433201A (en) * | 2020-11-27 | 2021-03-02 | 歌尔科技有限公司 | Distance measurement method and device and terminal equipment |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407343A (en) * | 2014-12-01 | 2015-03-11 | 福建联迪商用设备有限公司 | Method and system for distance measurement by bluetooth |
| CN106443648A (en) * | 2015-08-13 | 2017-02-22 | 株式会社理光 | Method for judging approaching of electronic device and device thereof |
| CN106443648B (en) * | 2015-08-13 | 2019-06-21 | 株式会社理光 | Judge the close method and apparatus of electronic device |
| CN105425229A (en) * | 2015-11-02 | 2016-03-23 | 上海中船船舶设计技术国家工程研究中心有限公司 | Anti-collision monitoring device for lighter aboard ship |
| CN105425229B (en) * | 2015-11-02 | 2017-11-24 | 上海中船船舶设计技术国家工程研究中心有限公司 | A kind of lighter aboard ship anti-collision monitoring device |
| CN106685543A (en) * | 2016-12-09 | 2017-05-17 | 广州视源电子科技股份有限公司 | Wireless signal detection method and device |
| CN106941692A (en) * | 2017-04-27 | 2017-07-11 | 北京爱康泰科技有限责任公司 | Test method, device and the storage medium of wireless device |
| CN107140549A (en) * | 2017-06-29 | 2017-09-08 | 上海海事大学 | Two-electron atom bridge crane pivot angle and rope length detection means and its measuring method |
| CN110231595A (en) * | 2019-05-28 | 2019-09-13 | 武汉盛硕电子有限公司 | A kind of method of bluetooth ranging, the test method of bluetooth equipment and system |
| CN111325880A (en) * | 2020-02-26 | 2020-06-23 | 广州市艾森斯软件研发有限公司 | Bluetooth-based positioning door opening method and device, intelligent terminal and storage medium |
| CN112433201A (en) * | 2020-11-27 | 2021-03-02 | 歌尔科技有限公司 | Distance measurement method and device and terminal equipment |
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Application publication date: 20140917 |