CN104936286A - Tunnel three-channel difference range finding method based on RSSI - Google Patents
Tunnel three-channel difference range finding method based on RSSI Download PDFInfo
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- CN104936286A CN104936286A CN201510240291.6A CN201510240291A CN104936286A CN 104936286 A CN104936286 A CN 104936286A CN 201510240291 A CN201510240291 A CN 201510240291A CN 104936286 A CN104936286 A CN 104936286A
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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
- H04W64/003—Locating users or terminals or network equipment for network management purposes, e.g. mobility management locating network equipment
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Abstract
A tunnel three-channel difference range finding method based on a RSSI relates to the wifi positioning technical field, and comprises the following steps: 1, deploying a wifi positioning anchor node in a tunnel narrow long space, wherein the wifi anchor node completes three non-disturbance channels switching in certain time period, respectively receives mobile target signal intensity from three channels, thus obtaining three related RSSI values; 2, selecting the middle channel as a reference according to the three related RSSI values, and the other two channels respectively carries out difference calculation with the middle channel, if a difference absolute value is bigger than a certain threshold, the position is considered to be a deep fading zone, thus correcting a distance position; 3, firstly using three-channel difference value to compensate the deep fading zone, then carrying out distance-loss model fitting, thus determining distance information of the target node. The tunnel three-channel difference range finding method can greatly reduce anchor node device number and antenna complexity, and can improve range finding precision.
Description
Technical field
The present invention relates to WiFi field of locating technology, be specifically related to the three channel differential distance-finding methods based on RSSI in a kind of tunnel.
Background technology
As in the WiFi distance-finding methods such as mine laneway, subway, highway bridge opening in existing various long and narrow space, according to RSSI(received signal strength indicator) value combination " distance-loss " matched curve, calculate the distance of moving target node, remain uniquely simple and practical method.But in the long and narrow space of tunnel, due to reflection and the multipath of symmetrical wall, at the very large formation deep fade of some fixed position electromagnetic wave fluctuation, impact " distance-loss " model steadily declines and adds the deviate of matched curve, therefore, range accuracy is greatly affected, especially in deep fade district because signal strength signal intensity is very little, range error is very big.
The method of multifrequency RSSI range finding, once for RFID range finding, uses 125kHz frequency to trigger and closely accurately locates, utilize 2.4GHz frequency to identify at a distance and uploading data.In radar fix system, also adopt multi-frequency method location, the probing wave of two or more frequency launched by multifrequency radar simultaneously, detects the target of different performance position according to echo angle or the time difference.
Summary of the invention
The object of the invention is to the defect for prior art and deficiency, the three channel differential distance-finding methods based on RSSI in a kind of tunnel are provided, can reduce in a large number on the quantity of anchor node device and the basis of antenna complex degree and improve range accuracy.
For achieving the above object, the technical solution used in the present invention is: based on the three channel differential distance-finding methods of RSSI in a kind of tunnel, comprise following steps: 1, in the long and narrow space of tunnel, dispose WiFi positioning anchor node, WiFi anchor node completes the switching that three do not interfere with each other channel within a certain period of time, in three channels, receive the intensity of moving target signal respectively, obtain three groups of RSSI value of being correlated with;
2, three groups of RSSI value of being correlated with, choosing intermediate channels is reference, and other two channels carry out Difference Calculation with intermediate channels respectively, when difference absolute value is greater than certain threshold value, thinks that this position is positioned at deep fade district, with this corrected range position.
3, first utilize three bad channel score values to compensate deep fade district, and then to " distance-loss " models fitting, judge the range information of destination node.
As preferably, in described step 1, three do not interfere with each other the centre frequency that alternate channel between channel is more than or equal between 5 channels and channel and are greater than 25MHz, and symmetrical relative to intermediate channels frequency difference, and having 4 groups of channels can use.
As preferably, in described step 2, three channels take intermediate channels as reference, the absolute value of the relative intermediate channels calculated difference of two other channel.
As preferably, in described step 3, utilize three bad channel score values first to compensate deep fade district, namely add the mean value of the absolute value of two differences with the RSSI value of intermediate channels, reduce the deviation of relative " distance-loss " matched curve of deep fade.
As preferably, in described step 3, utilize " distance-loss " matched curve, obtain the ranging information of moving target node according to the RSSI value after compensation.
The present invention utilizes WiFi tri-non-interfering channels, namely three UHF band reception to three RSSI value difference processing weaken the impact of down-hole multipath effect, the special deep fade district, local that reduces is on the impact of positional accuracy.The RSSI value that single channel detects is very large by the impact of multipath effect, and produce deep fade in some specific position, corresponding RSSI value far departs from matched curve, makes range error very large.But deep fade point has certain regularity, is namely closely related with tranmitting frequency; During three Channel Detection, in RSSI curve, deep fade point has in-plant deviation with the deviation of frequency, utilizes micro-deviation of deep fade point can the RSSI value of compensate for deep fades point, makes it close to matched curve.
The beneficial effect that the present invention produces is: the present invention can reduce the impact of multipath effect, reduce the worst error of range finding, improve accuracy and the precision of range finding, on the basis of existing system WiFi, software simulating provides cost savings, and can become the comparatively effective personnel positioning method in down-hole.
Accompanying drawing explanation
Fig. 1 is underground coal mine navigation system principle schematic of the present invention;
Fig. 2 is the selection schematic diagram that WiFi of the present invention tri-does not interfere with each other channel;
Fig. 3 is the schematic diagram of RSSI value and matched curve relation after the present invention utilizes three channel differential to compensate.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Referring to such as Fig. 1---shown in Fig. 3, this embodiment adopts following technical scheme: based on the three channel differential distance-finding methods of RSSI in a kind of tunnel, comprise following steps: 1, in the long and narrow space of tunnel, dispose WiFi positioning anchor node, WiFi anchor node completes the switching that three do not interfere with each other channel within a certain period of time, in three channels, receive the intensity of moving target signal respectively, obtain three groups of RSSI value of being correlated with;
2, three groups of RSSI value of being correlated with, choosing intermediate channels is reference, and other two channels carry out Difference Calculation with intermediate channels respectively, when difference absolute value is greater than certain threshold value, thinks that this position is positioned at deep fade district, with this corrected range position.
In above-mentioned steps 1, described multiple non-interfering channel quantity is 3.
In above-mentioned steps 1, described three do not interfere with each other the centre frequency that alternate channel between channel is more than or equal between 5 channels and channel and are greater than 25MHz, and symmetrical relative to intermediate channels frequency difference, and having 4 groups of channels can use, as: 1,6,11 or 1,7,13; 2,7,12; 3,8,13.
According to compensation difference algorithm: RSSI=I2+(|I1-I2|+|I3-I2|)/2, obtain three RSSI value of destination node: I1, I2, I3.
3, first utilize three bad channel score values to compensate deep fade district, and then to " distance-loss " models fitting, judge the range information of destination node.
" distance-loss " model logarithm-normal functional describes: RSSI=-10nlgd-A; In formula, parameter A represents the RSSI absolute value that distance anchor node receives when being 1m; N is Signal transmissions attenuation constant in tunnel; D is the distance apart from WiFi positioning anchor node.
Data Comparison finds by experiment, and three channel differential distance-finding methods, the RSSI value after process and the maximum deflection difference value of matched curve can be reduced to 20dB, thus maximum measure distance error can reduce to 2m.
The beneficial effect that the present invention produces is: the present invention can reduce the impact of multipath effect, reduce the worst error of range finding, improve accuracy and the precision of range finding, on the basis of existing system WiFi, software simulating provides cost savings, and can become the comparatively effective personnel positioning method in down-hole.
Claims (5)
1. in a tunnel based on the three channel differential distance-finding methods of RSSI, it is characterized in that it comprises following steps: (1), in the long and narrow space of tunnel, dispose WiFi positioning anchor node, WiFi anchor node completes the switching that three do not interfere with each other channel within a certain period of time, in three channels, receive the intensity of moving target signal respectively, obtain three groups of RSSI value of being correlated with;
(2), three groups of relevant RSSI value, choosing intermediate channels is reference, and other two channels carry out Difference Calculation with intermediate channels respectively, when difference absolute value is greater than certain threshold value, thinks that this position is positioned at deep fade district, with this corrected range position;
(3), first utilize three bad channel score values to compensate deep fade district, and then to " distance-loss " models fitting, judge the range information of destination node.
2. in a kind of tunnel according to claim 1 based on the three channel differential distance-finding methods of RSSI, it is characterized in that: in described step 1, three do not interfere with each other the centre frequency that alternate channel between channel is more than or equal between 5 channels and channel and are greater than 25MHz, and symmetrical relative to intermediate channels frequency difference, having 4 groups of channels can use.
3. in a kind of tunnel according to claim 1 based on the three channel differential distance-finding methods of RSSI, it is characterized in that: in described step 2, three channels take intermediate channels as reference, the absolute value of the relative intermediate channels calculated difference of two other channel.
4. in a kind of tunnel according to claim 1 based on the three channel differential distance-finding methods of RSSI, it is characterized in that: in described step 3, three bad channel score values are utilized first to compensate deep fade district, namely add the mean value of the absolute value of two differences with the RSSI value of intermediate channels, reduce the deviation of relative " distance-loss " matched curve of deep fade.
5. in a kind of tunnel according to claim 1 based on the three channel differential distance-finding methods of RSSI, it is characterized in that: in described step 3, utilize " distance-loss " matched curve, obtain the ranging information of moving target node according to the RSSI value after compensation.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106610293A (en) * | 2015-10-23 | 2017-05-03 | 北斗导航位置服务（北京）有限公司 | Indoor positioning method and system based on intensity difference |
| CN117769099A (en) * | 2024-01-29 | 2024-03-26 | 深圳市汇德科技有限公司 | Remote control method and device for LED lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106610293A (en) * | 2015-10-23 | 2017-05-03 | 北斗导航位置服务（北京）有限公司 | Indoor positioning method and system based on intensity difference |
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| CN117769099A (en) * | 2024-01-29 | 2024-03-26 | 深圳市汇德科技有限公司 | Remote control method and device for LED lamp |
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Application publication date: 20150923 |