CN106375936B - A kind of RSSI fitting system - Google Patents
A kind of RSSI fitting system Download PDFInfo
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- CN106375936B CN106375936B CN201610727339.0A CN201610727339A CN106375936B CN 106375936 B CN106375936 B CN 106375936B CN 201610727339 A CN201610727339 A CN 201610727339A CN 106375936 B CN106375936 B CN 106375936B
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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
- H04W4/02—Services making use of location information
- H04W4/023—Services making use of location information using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
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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
- H04W4/02—Services making use of location information
- H04W4/025—Services making use of location information using location based information parameters
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Abstract
The invention discloses a kind of RSSI to be fitted system, can be effectively reduced the difficulty of Range finding experiments, prevents operating error, improves fitting precision.A kind of RSSI of the invention is fitted system, comprising: detector sends program request packet to coordinator respectively in different location first；Coordinator receives program request packet, obtains RSSI value and extracts actual distance value in program request packet；Coordinator by the program request packet of predetermined quantity RSSI value and actual distance value be integrated into a RSSI data packet and to host computer send RSSI data packet；Host computer receives RSSI data packet, all RSSI values and corresponding actual distance value is extracted from RSSI data packet, and shown to all RSSI values and corresponding actual distance value with curve graph；Whether the dispersion degree feature of host computer judgment curves is significant, if so, returning to the first step；Otherwise, host computer carries out precision processing to all RSSI values, obtains RSSI exact value；Finally, host computer is fitted processing to RSSI exact value, obtains A and n then according to predetermined process rule.
Description
Technical field
The present invention relates to the communications field more particularly to a kind of RSSI range-measurement system, system, detector, coordinators and upper
Machine.
Background technique
With economic and science and technology development, people have higher requirement to life, and various novel sensors are various high-new
Science and technology emerges one after another.And wherein, indoor locating system is doted at the love of science and technology, when environment is not available satellite positioning indoors,
Use indoor positioning technologies as the auxiliary positioning of satellite positioning, solution satellite-signal is weaker when reaching ground, cannot penetrate and build
The problem of building object.And most indoor locating system uses RSSI (Received Signal Strength
Indication received signal strength indicator) range measurement principle.
Currently, there are many technical solutions for the realization of indoor positioning technologies, wherein based on Zigbee protocol stack RSSI positioning
Scheme is due to little power consumption, and at low cost, highly reliable advantage is widely used in indoor ranging, it is according to RSSI- range attenuation
For law curve come what is positioned, RSSI range measurement principle uses Shadowing gradual change theoretical model, formula are as follows: RRSSI=A-
The average energy absolute value that the distance emitter 1m that 10nlg (d), radio frequency parameter A are defined as being indicated with dBm is received, also
It is away from the received signal strength at transmitting node 1m；N is propagation factor, and propagation factor depends primarily on wireless signal in air
The interference such as decaying, reflection, multipath effect, it is related with signal transmission environment；D is the distance away from transmitting node.
Therefore, Yao Yingyong indoor positioning, it is necessary first to measure the RSSI- distance between positioning node and reference mode in advance
Attenuation law curve values A, n.Since positioning accuracy greatly depends on parameter A, the accuracy of n, especially n value, n value it is correct with
The no influence to positioning accuracy can reach 2m or more, therefore it is necessary to accurately measure the two parameters.
It is common at present that there are three types of systems:
The estimation technique
It is using the system of estimation that indoor positioning is simplest to the determination of channel fading factor of n at present, this is a kind of fixed
Property system and positioning node is placed in survey for example, first passing through experiment after positioning system completion and determining radio frequency parameter A
Away from face center, by constantly finely tuning channel fading factor of n, makes to position calibrated, then decide n at this time.But relatively more mixed
In miscellaneous indoor positioning, only determine that the n of some position makes accurate positioning be inadequate, it is more likely that it is quasi- but another certain point occur
Outer situation about being a little not allowed.At this time, it is necessary to use detector, could quantitatively understand ambient enviroment, and make corresponding change.
Weighted average calculation method:
Shanghai Inst. of Microsystem and Information Technology, Chinese Academy of Sci, application number (CN201110300384.5) disclose one
WLS node self-localization system based on RSSI ranging in kind wireless sense network:
Multiple channel fading factor of n are obtained by weighted calculation first in position fixing process, this system is actually adopted
The distance number of sample is quite few, and each distance value is not equidistant, and is excessively concentrated, for example, it is assumed that in actual use,
One panel region is positioned (8 quite a lot of, minimum 3) with 8 beaconing nodes, the distance between different beacons value
Be up toKind, and this 28 distance values are not equidistant, but Relatively centralized is between some distance regions, reason
Be, when reality uses location technology, this 8 beaconing nodes can close to equidistantly putting, so that location area is larger, so when
With Unequal distance and less test sample is calculated, and n value has certain error.
This algorithm can be to increase system resource as cost.Moreover, which is black box algorithm, and operator can not
It can be visually seen the calculating accuracy of n value, the positioning in actual use is once inaccurate, it is difficult to exclude whether to be because n value error is big
The reason of.
Field measurement method:
In the actual operation process, in order to measure the parameter A, n in RSSI characteristic curve.Generally there is following process:
Zigbee data packet is constantly sent to coordinator, after coordinator is collected into data packet, initial value at detector end
All RSSI values that rice is surveyed are packaged into packet.Above procedure is repeated, the RSSI value data packet that detector is surveyed in rice is sequentially complete
Portion is sent to host computer.(wherein Di+1-Di=a (often, i.e., operator needs to operate at equal intervals when detection)
Host computer collects RSSI data packet, imagineering's RSSI value therein, resulting at equal intervals with serial ports assistant
RSSI value discharges arrangement in order and forms RSSI matrix, is put into the fitting code finished writing, and fitting obtains A, n.Actual measurement
RSSI matrix example is as follows:
The exact value that A, n value are surveyed as the environment substitutes into RRSSIIn=A-10nl, it can convert and obtain from RSSI
Distance d is used for subsequent location algorithm.
Since the prior art has, fitting precision is not high or fit procedure is not intuitive, more many and diverse, it is difficult to the disadvantages of examining, therefore
A RSSI fitting system is urgently devised, allows RSSI Range finding experiments to become simple and easy, raising while reducing maloperation
Fitting precision.
Summary of the invention
The embodiment of the invention provides a kind of RSSI to be fitted system, can be effectively reduced the difficulty of Range finding experiments, prevents from grasping
Make error, improves fitting precision.
A kind of RSSI provided in an embodiment of the present invention is fitted system, comprising:
Detector, coordinator and host computer；
Detector carries detector and coordination for sending respectively to coordinator according to predetermined movement rule in different location
The program request packet of actual distance value between device；
Coordinator includes:
First receiving unit for receiving program request packet, and obtains RSSI value；
First extraction unit, for extracting actual distance value in program request packet；
Integral unit, in the program request packet by predetermined quantity RSSI value and actual distance value be integrated into a RSSI number
According to packet；
First transmission unit sends RSSI data packet to host computer for coordinator；
Host computer includes:
Second receiving unit, for receiving RSSI data packet；
Second extraction unit, for extracting all RSSI values and corresponding actual distance value from RSSI data packet；
Display unit, for being shown with curve graph to all RSSI values and corresponding actual distance value；
Acquiring unit, for obtaining the dispersion degree feature of curve graph；
First judging unit, for judging whether dispersion degree feature is significant；
It refines processing unit and obtains RSSI exact value for carrying out precision processing to all RSSI values；
Process of fitting treatment unit is fitted processing for the RSSI exact value, obtains A and n.
Optionally,
Coordinator further include: storage unit and accumulated unit；
The RSSI value of every program request packet is stored in an array by storage unit for coordinator；
Accumulated unit adds up the quantity of received program request packet for coordinator.
Optionally,
Host computer further include:
Reading unit, for reading current RSSI data packet using LABview serial ports control.
Optionally,
Refining processing unit includes:
Filtering subunit filters off the mutation value in all RSSI values for using LABview gaussian filtering method；
Average handles subelement, and for carrying out average processing to the RSSI value for filtering off mutation value, it is accurate to obtain RSSI
Value.
Optionally,
Host computer further includes substituting into unit, for RSSI exact value to be substituted into formula, obtains measurement distance value；
Host computer further includes the second transmission unit, for sending measurement distance value to coordinator；
Coordinator further includes third transmission unit, for sending measurement distance value to detector；
Detector further includes second judgment unit, for judging that measuring distance value and the absolute value of actual distance value difference value is
It is no to meet error requirements.
Optionally,
Detector further includes first distance display unit, the actual distance value for showing.
Optionally,
Detector further includes second distance display unit, for showing measurement distance value.
As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that
In the embodiment of the present invention, detector is taken to coordinator transmission according to predetermined movement rule in different location respectively first
Program request packet with the actual distance value between detector and coordinator；Then, coordinator receives program request packet, and obtains RSSI value；
Then, coordinator extracts actual distance value in program request packet；When the quantity of program request packet reaches predetermined quantity, coordinator is by predetermined number
RSSI value and actual distance value in the program request packet of amount are integrated into a RSSI data packet；It is sent again from coordinator to host computer
RSSI data packet；Then, host computer receives RSSI data packet；Then, host computer extracts all RSSI values from RSSI data packet
With corresponding actual distance value；Then, host computer shows all RSSI values and corresponding actual distance value with curve graph；
Again by host computer obtains the dispersion degree feature of the curve graph；Then, host computer judges whether the dispersion degree feature shows
It writes, if so, return step detector is sent to coordinator according to predetermined movement rule in different location respectively carries detector
The program request packet of actual distance value between coordinator；Otherwise, host computer carries out precision processing to all RSSI values, obtains
RSSI exact value；Finally, host computer is fitted processing to RSSI exact value, obtains A and n then according to predetermined process rule.With
The prior art is compared, and technical solution of the present invention then obtains dispersion degree feature by drawing curve graph, and according to dispersion degree come
Judge whether to be fitted.To which operator can intuitively analyze RSSI attenuation process in the environment, judge whether its decaying is stable,
To improve fitting precision.
Detailed description of the invention
Fig. 1 is that RSSI in the prior art is fitted system schematic structural diagram of the first embodiment；
Fig. 2 is that RSSI in the prior art is fitted system schematic structural diagram of the second embodiment；
Fig. 3 is that RSSI in the prior art is fitted system 3rd embodiment structural schematic diagram；
Fig. 4 is that RSSI in the prior art is fitted system fourth embodiment structural schematic diagram.
Specific embodiment
The embodiment of the invention provides a kind of RSSI to be fitted system, can be effectively reduced the difficulty of Range finding experiments, prevents from grasping
Make error, improves fitting precision.
Referring to Fig. 1, a kind of RSSI fitting system first embodiment provided by the invention includes:
Detector 100, coordinator 200 and host computer 300；
Detector 100, for according to predetermined movement rule different location respectively to coordinator send carry detector with
The program request packet of actual distance value between coordinator；
Coordinator 200 includes:
First receiving unit 201, for receiving program request packet, and obtains RSSI value；
First extraction unit 202, for extracting actual distance value in program request packet；
Integral unit 203, in the program request packet by predetermined quantity RSSI value and actual distance value be integrated into one
RSSI data packet；
First transmission unit 204 sends RSSI data packet to host computer for coordinator；
Host computer 300 includes:
Second receiving unit 301, for receiving RSSI data packet；
Second extraction unit 302, for extracting all RSSI values and corresponding actual distance value from RSSI data packet；
Display unit 303, for being shown with curve graph to all RSSI values and corresponding actual distance value；
Acquiring unit 304, for obtaining the dispersion degree feature of curve graph；
First judging unit 305, for judging whether dispersion degree feature is significant；
It refines processing unit 306 and obtains RSSI exact value for carrying out precision processing to all RSSI values；
Process of fitting treatment unit 307 is fitted processing for the RSSI exact value, obtains A and n.
The correspondence between said units is illustrated with the example in a practical application below:
Detector 100 sends to coordinator respectively in different location according to predetermined movement rule and carries detector and association first
Adjust the program request packet of the actual distance value between device；
In the present embodiment, detector 100 is taken to the transmission of coordinator 200 according to predetermined movement rule in different location respectively
Program request packet with the actual distance value between detector and coordinator；
It should be noted that detector 100 can be the CC2530 chip based on the operation of Zigbee protocol stack, it can be with
Low-down total material cost establishes powerful network node.CC2530 chip has the compatible nothing of an IEEE 802.15.4
Line transceiver.Wireless module is simulated in nuclear control in RF.In addition, it provides an interface between MCU and wireless device, this makes
Order can be issued by obtaining, and reading state is automatically brought into operation and determines the sequence of wireless device event.Wireless device further includes a number
According to packet filtering and Address Recognition module.It is mainly made of, including detector chip CC2530, shows four modules on detector hardware
Show modular LCD 1602, power module (charging module TP4056,500mAh lithium battery), key module.We are made using CC2530
It for the terminal device in zigbee agreement stack, is triggered with key, sends program request packet to coordinator 200.
Detector 100 different positions to the purpose that coordinator 200 sends program request packet be to improve the steady of RSSI value
It is qualitative, due to its Gaussian distributed, it can generally send at least 20 program request packets.
Wherein, it is from the mobile fixed range in current location that scheduled movement rule, which includes: the predetermined movement rule,.For example,
Using current location as the center of circle, with 0.5 meter for radius, it is arbitrarily moved to any point on the circle, then carry out by the center of circle of the point
It moves next time.
Alternatively, predetermined movement rule is from the mobile specific range in current location, the instruction of mobile specific range is by host computer
It issues.Since host computer can draw characteristic curve, and decayed in the environment in characteristic dispersion degree characterization RSSI
Journey judges whether its decaying is stable, and estimation influences in advance, is adjusted simultaneously.Wherein adjustment distance is a feasible side
Case.To which host computer directly can send move to detector, it is desirable that the mobile specific distance of detector.
It should be noted that detector 100 is initialized before sending program request packet to coordinator 200, initially
The purpose of change is to keep experiment more smooth.Detector 100 initializes zigbee agreement stack, including af address style, endpoint are retouched
It states, format is briefly described.
Then, the first receiving unit 201 receives program request packet, and obtains RSSI value；
In the present embodiment, the first receiving unit 201 receives program request packet, and obtains RSSI value；CC2530 in detector 100
Chip has the received signal strength indicator device built in one, automatic to calculate the one 8 unlimited power digital values for having symbol, RSSI
Value is averaged always by (128 microsecond) in 8 symbol periods, is consistent with IEEE 802.15.4.Coordinator
Zigbee agreement stack can read it from register when receiving program request packet, and be attached in the frame received automatically.
It should be noted that in order to keep experiment more smooth.Coordinator 200 initializes zigbee agreement stack, including the address af
Endpoint description, format is briefly described in type.
Then, the first extraction unit 202 extracts actual distance value in program request packet；
In the present embodiment, the first extraction unit 202 extracts actual distance value from program request packet.The actual distance value is inspection
The actual range between instrument 100 and coordinator 200 is surveyed, which will change with the movement of detector 100.It is believed that
As soon as coordinator 200 does not receive a program request packet, wherein including an actual distance value.
When the quantity of program request packet reaches predetermined quantity, integral unit 203 is by the RSSI value in the program request packet of predetermined quantity
It is integrated into a RSSI data packet with actual distance value；
In the present embodiment, when the quantity of program request packet reaches predetermined quantity, integral unit 203 is by the program request of predetermined quantity
RSSI value and actual distance value in packet are integrated into a RSSI data packet；
It should be noted that in order to improve the stability of RSSI value, it is general to receive extremely due to its Gaussian distributed
Few 20 program request packets are just integrated, such as obtain the RSSI data packet for carrying 50 RSSI values and actual distance value.
RSSI data packet is sent from the first transmission unit 204 to host computer 300 again；
In the present embodiment, RSSI data packet is issued host computer 300 with serial ports by the first transmission unit 204.It is wherein upper
Machine 300 can be one or more kinds of combinations in special purpose computer, PC and plate.
Second receiving unit 301 of host computer 300 receives RSSI data packet first；
Reading unit 312 reads current RSSI data packet by LABVIEW serial ports control.
Second extraction unit 302 extracts all RSSI values and corresponding actual distance value from RSSI data packet；
In the present embodiment, the second extraction unit 302 extracts all RSSI values and corresponding reality from RSSI data packet
Distance value.
Then, display unit 303 shows all RSSI values and corresponding actual distance value with curve graph；
In this example it is shown that unit 303 shows all RSSI values and corresponding actual distance value with curve graph
Show.
It should be noted that having RSSI characteristic curve detector interface, wherein abscissa on the interface UI of host computer 300
It can indicate distance, ordinate can indicate that RSSI value, all RSSI values of host computer and corresponding actual distance value are marked on the diagram
Note, and formation characteristic curve.
Then, acquiring unit 304 obtains the dispersion degree feature of the curve graph；
In the present embodiment, acquiring unit 304 obtains the dispersion degree feature of curve graph, and dispersion degree characterization RSSI exists
It is whether stable under environment.
Then, the first judging unit 305 judges whether the dispersion degree feature is significant；
Precision processing unit 306 carries out precision processing to all RSSI values if not, obtains RSSI exact value；
Finally, process of fitting treatment unit 307 according to predetermined process rule, processing is fitted to RSSI exact value, obtain A with
n。
In the present embodiment, the first judging unit 305 judges whether the dispersion degree feature is significant, if so, returning
Step detector 100 sends to coordinator 200 respectively in different location according to predetermined movement rule and carries detector 100 and coordination
The program request packet of actual distance value between device 200；Otherwise, precision processing unit 306 carries out at precision all RSSI values
Reason, obtains RSSI exact value.Specific predetermined process rule will be described in detail in subsequent embodiment.
In the embodiment of the present invention, compared with prior art, technical solution of the present invention is by drafting curve graph, then obtains discrete
Degree feature, and according to dispersion degree to determine whether fitting.It declines in the environment to which operator can intuitively analyze RSSI
Subtract process, judges whether its decaying is stable, to improve fitting precision.
A kind of RSSI fitting system first embodiment provided by the invention is illustrated above, below referring to Fig. 2,
A kind of RSSI fitting system second embodiment provided by the invention, which is different from the first embodiment, to be,
Coordinator 200 further comprises:
Storage unit 205, for the RSSI value of every program request packet to be stored in an array；
Accumulated unit 206, for adding up the quantity of received program request packet；
In the present embodiment, the RSSI value of every program request packet is stored in an array by storage unit 205, which can be with
Its capacity, such as [50] array are pre-defined, indicates that array stores 50 objects.Accumulated unit 206 adds up received point
Broadcast the quantity of packet.
In the present embodiment, host computer judges whether the dispersion degree feature is significant, if so, return step detector
Send the actual distance value carried between detector and coordinator to coordinator respectively in different location according to predetermined movement rule
Program request packet；Otherwise, host computer carries out precision processing to all RSSI values, obtains RSSI exact value.Specific predetermined process rule
It will be then described in detail in subsequent embodiment.
In the embodiment of the present invention, in addition to the beneficial effect for having first embodiment, the embodiment of the present invention is stored by array
With the quantity of accumulative object, to reduce the difficulty of operating system.
A kind of RSSI fitting system second embodiment provided by the invention is described above, the present invention is mentioned below
A kind of RSSI supplied is fitted system 3rd embodiment and is in aforementioned any embodiment difference,
Host computer 300 further include:
Filtering subunit 3061 filters off the mutation value in all RSSI values for using LABview gaussian filtering method；
Average handles subelement 3062, for carrying out average processing to the RSSI value for filtering off mutation value, obtains RSSI
Exact value.
In the present embodiment, filtering subunit 3061 uses LABview gaussian filtering method, filters off in all RSSI values
Mutation value；
The RSSI value that average handles 3062 pairs of subelement elimination mutation values carries out average processing, and it is accurate to obtain RSSI
Value.
In the present embodiment, 50 RSSI carry out gaussian filtering, and algorithm is as follows:
Probability density function are as follows:
Wherein:
M is measurement number (the design is set as 50)
High-probability event occurs to be greater than 0.6 (empirical value) in probability:
0.6≤f (x)≤1,0.15 σ+μ≤σ+μ of x≤3.09 filter wherein unstable RSSI value by gaussian filtering
It removes, then arithmetic average operation is carried out to remaining virtual value, find out accurate radio reception power value RSSIexnet。
Fitting algorithm is as follows:
Such as the value of A and n are estimated by linear regression analysis, it is assumed that the measured data of experiment obtained from indoor environment is
(RSSIi, Di), i=1,2 ..., n, RSSIiIndicate rssi measurement value corresponding after gaussian filtering.
Definition: ρi=-10lgDi, i=1,2 ..., m；
Wherein, m is signal strength hits, if primary every 0.5m sampling, samples 20 meters, then m=40.Have and following estimates
Meter:
Wherein:
Regression coefficient R2, is defined as:
Wherein
The standard deviation of prediction signal intensity
In the present embodiment, in addition to the beneficial effect for having aforementioned any one embodiment, after gaussian filtering noise reduction,
The accuracy of laboratory sample is ensured, then RSSI exact value fitting result that average value is handled is carried out to it will be more accurate.
A kind of RSSI fitting system 3rd embodiment provided by the invention is described above, the present invention is mentioned below
A kind of RSSI fitting system fourth embodiment supplied is illustrated:
The embodiment is with previous embodiment difference,
Host computer 300 further includes substituting into unit 308, for RSSI exact value to be substituted into formula, obtains measurement distance value；
Host computer 300 further includes the second transmission unit 309, for sending measurement distance value to coordinator 200；
Coordinator 200 further includes third transmission unit 207, for sending measurement distance value to detector 100；
Detector 100 further include:
Second judgment unit 101, for judging whether the absolute value for measuring distance value and actual distance value difference value meets mistake
Difference requires；
First distance display unit 102, for showing actual distance value；
Second distance display unit 103, for showing measurement distance value.
It substitutes into unit 308 and RSSI exact value is substituted into formula, obtain measurement distance value；Second transmission unit 309 is to coordination
Device 200 sends measurement distance value；Third transmission unit 207 sends measurement distance value to detector 100；Second judgment unit 101
Judge whether measure distance value and the absolute value of actual distance value difference value meets error requirements.
In the present embodiment, in addition to the beneficial effect for having any one of aforementioned embodiment, judge to measure distance value and true
Whether the absolute value of distance value difference meets error requirements；If then terminating process, if it is not, then return step detector 100
Send the reality carried between detector 100 and coordinator 200 to coordinator 200 respectively in different location according to predetermined movement rule
The program request packet of distance value.To further improve fitting precision.
It should be noted that detector 200 can show actual distance value and measurement distance value.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before
Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (7)
1. a kind of RSSI is fitted system characterized by comprising
Detector, coordinator and host computer；
Detector, for according to predetermined movement rule different location sent respectively to coordinator carry the detector with it is described
The program request packet of actual distance value between coordinator；
The coordinator includes:
First receiving unit for receiving the program request packet, and obtains RSSI value；
First extraction unit, for extracting actual distance value in the program request packet；
Integral unit, in the program request packet by predetermined quantity RSSI value and actual distance value be integrated into a RSSI data
Packet；
First transmission unit sends the RSSI data packet to host computer for coordinator；
The host computer includes:
Second receiving unit, for receiving the RSSI data packet；
Second extraction unit, for extracting all RSSI values and corresponding actual distance value from the RSSI data packet；
Display unit, for being shown with curve graph to all RSSI values and corresponding actual distance value；
Acquiring unit, for obtaining the dispersion degree feature of the curve graph；
First judging unit, for judging whether the dispersion degree feature is significant；
It refines processing unit and obtains RSSI exact value for carrying out precision processing to all RSSI values；
Process of fitting treatment unit is fitted processing for the RSSI exact value, obtains A and n, and the A is away from the detector
Received signal strength at 1m, the n are propagation factor.
2. RSSI according to claim 1 is fitted system, which is characterized in that
The coordinator further include: storage unit and accumulated unit；
The RSSI value of every program request packet is stored in an array by the storage unit for coordinator；
The accumulated unit adds up the quantity of received program request packet for coordinator.
3. RSSI according to claim 1 is fitted system, which is characterized in that
The host computer further include:
Reading unit, for reading current RSSI data packet using LABview serial ports control.
4. RSSI according to claim 1 is fitted system, which is characterized in that
The precision processing unit includes:
Filtering subunit filters off the mutation value in all RSSI values for using LABview gaussian filtering method；
Average handles subelement, for carrying out average processing to the RSSI value for filtering off mutation value, obtains RSSI exact value.
5. RSSI according to claim 1 is fitted system, which is characterized in that
The host computer further includes substituting into unit, for the RSSI exact value to be substituted into formula, obtains measurement distance value；
The host computer further includes the second transmission unit, for sending the measurement distance value to the coordinator；
The coordinator further includes third transmission unit, for sending the measurement distance value to the detector；
The detector further includes second judgment unit, for judging the absolute of measurement distance value and the actual distance value difference value
Whether value meets error requirements.
6. RSSI according to claim 1 is fitted system, which is characterized in that
The detector further includes first distance display unit, for showing the actual distance value.
7. RSSI according to claim 5 is fitted system, which is characterized in that
The detector further includes second distance display unit, for showing the measurement distance value.
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| CN104125537A (en) * | 2014-08-12 | 2014-10-29 | 湖北工业大学 | CC2530-based multi-mode co-location system and method |
| CN105430745A (en) * | 2015-12-28 | 2016-03-23 | 迈普通信技术股份有限公司 | Wireless network positioning method based on RSSI (Received Signal Strength Indicator) |
| CN105530702A (en) * | 2016-01-25 | 2016-04-27 | 杭州电子科技大学 | Wireless sensing network mobile node positioning method based on self-organizing mapping |
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