CN109709539A - Intelligent electric meter method of locating terminal and system - Google Patents
Intelligent electric meter method of locating terminal and system Download PDFInfo
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- CN109709539A CN109709539A CN201910091928.8A CN201910091928A CN109709539A CN 109709539 A CN109709539 A CN 109709539A CN 201910091928 A CN201910091928 A CN 201910091928A CN 109709539 A CN109709539 A CN 109709539A
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Abstract
The invention discloses a kind of intelligent electric meter method of locating terminal and system, it is used for the positioning intelligent ammeter terminal in smart grid, which to include: that intelligent electric meter terminal sends Chirp signal；Multiple smart grid gateways receive the Chirp signal that intelligent electric meter terminal is sent, and each smart grid gateway goes out the Chirp signal received according to the information reconstruction of the Chirp signal received and the Chirp signal and smart grid gateway that the reproduction goes out are sent to intelligent electric meter terminal to the processing delay information of Chirp signal jointly；After intelligent electric meter terminal receives the Chirp signal of each smart grid gateway passback, itself is calculated at a distance from each smart grid gateway according to the information of the Chirp signal received and processing delay information；Intelligent electric meter terminal calculates the position of itself according to the position of distance and each smart grid gateway.The intelligent electric meter method of locating terminal and its cost of system are lower, and reliability of positioning and precision are higher.
Description
Technical field
The present invention relates to smart grid fields, especially with regard to a kind of intelligent electric meter method of locating terminal and system.
Background technique
In power grid, it usually needs positioned to ammeter terminal.For example, passing through ammeter end when ammeter breaks down
The location information at end can help maintenance personnel find the problem in time ammeter specific location to repairing, effectively improve work
Make efficiency.For another example, Utilities Electric Co., can be easily right according to the location information of ammeter terminal when asset statistical is fixed
Ammeter terminal takes statistics, while also contributing to obtaining the relevant information for the ammeter terminal lost by special circumstances.
At present in smart grid, locating scheme mainly includes satellite positioning, RSSI (instruction of received signal intensity) ranging
Positioning etc..
Satellite positioning method is as follows: GNSS (Global Navigation Satellite System) satellite leads satellite clock and orbital data write-in
Avionics text, is sent to ground receiver.Receiver handles satellite-signal, obtains self-position and precise time information.
Receiver treatment process includes: that satellite-signal enters radio-frequency front-end, completes amplification, mixing and A/D conversion, obtains digital signal,
It is input to baseband portion, rough spreading code and carrier frequency is obtained by acquisition procedure, then be transferred to tracking process and obtain accurately
Spreading code and carrier information, and parse navigation message, including satellite position and temporal information.In order to correctly solve reception
The three-dimensional position and clock jitter of machine at least need four satellite datas, establish equation group, to obtain accurate receiver
Position and clock information.
Inventor has found that satellite positioning precision is although high in the implementation of the present invention, and satellite positioning needs to use
Special positioning chip, high performance positioning chip design is complicated, and price is also higher, if answered on a large scale in smart grid
With the cost that can to arrange net greatly improves.
RSSI ranging localization is that distance measuring signal is sent by base station, and ammeter terminal receives the signal and calculates RSSI, and then
To transmission range, terminal location is obtained in conjunction with the known location of base station.Specifically, at least four groups of gateways send data letter respectively
Number, ammeter terminal extracts the identifier of each gateway after receiving, and then tables look-up to obtain the position of each gateway.Meanwhile ammeter
Terminal calculates the RSSI for receiving signal, is obtained at a distance from each gateway according to corresponding algorithm.Receive power and transmission range it
Between relationship are as follows: Pr=A-10*n*lg (R), wherein Pr be receive power, A be send signal transmit 1m apart from when power, n
For propagation factor, R is transmission range.Resulting transmission range and respective gateway location are distinguished in conjunction with 4 groups of gateway rangings, obtain electricity
Meter terminal position.
Inventor has found in the implementation of the present invention, its range accuracy of RSSI ranging localization by channel effects compared with
Greatly, and the use environment of intelligent electric meter terminal often decays very big, and there are a large amount of multipath signals, therefore its range error is big,
Positioning accuracy is very low, it is difficult to meet the requirements.
The information disclosed in the background technology section is intended only to increase the understanding to general background of the invention, without answering
When being considered as recognizing or imply that the information constitutes the prior art already known to those of ordinary skill in the art in any form.
Summary of the invention
The purpose of the present invention is to provide a kind of intelligent electric meter method of locating terminal and systems, and cost is lower, and positioning can
It is higher by property and precision.
To achieve the above object, the present invention provides a kind of intelligent electric meter method of locating terminal, the intelligent electric meter terminal is fixed
Position method is used for the positioning intelligent ammeter terminal in smart grid, and the intelligent electric meter method of locating terminal includes: intelligent electric meter
Terminal sends Chirp signal；Multiple smart grid gateways receive the Chirp signal that the intelligent electric meter terminal is sent, Mei Gesuo
Smart grid gateway is stated to go out the Chirp signal received according to the information reconstruction of the Chirp signal received and go out the reproduction
Chirp signal and the smart grid gateway to the processing delay information of Chirp signal be sent to jointly it is described intelligence electricity
Meter terminal；After the intelligent electric meter terminal receives the Chirp signal of each smart grid gateway passback, according to receiving
Chirp signal information and the processing delay information calculate itself at a distance from each smart grid gateway；
The intelligent electric meter terminal calculates the position of itself according to the position of the distance and each smart grid gateway.
In a preferred embodiment, the intelligent electric meter terminal receives each smart grid gateway passback
After Chirp signal, itself and each intelligence are calculated according to the information of the Chirp signal received and the processing delay information
Can the distance of power grid gateway include: that the intelligent electric meter terminal receives and processes each smart grid gateway and returns
Chirp signal obtains the frequency f of each Chirp signaljWith phase pj, while received signal is filtered and is demodulated to
Obtain the processing delay information Δ T of each smart grid gatewayj；Obtain the intelligent electric meter terminal currently newest transmission
The frequency f0 of Chirp signal, and Chirp signal frequency change rate u is combined, the Chirp signal is obtained from the intelligent electric meter
One-way transmission time [(f0-f of the terminal to each smart grid gatewayj)/u-ΔTj]/2；It is whole to calculate the intelligent electric meter
End and each smart grid gateway distance Rj, Rj=c [(f0-fj)/u-ΔTj]/2, wherein c is the light velocity.
In a preferred embodiment, the intelligent electric meter terminal is according to the distance and each smart grid net
The position that the position of pass calculates itself includes: to set the position of the intelligent electric meter terminal as (x, y, z), the intelligent electric meter terminal
Clocking error with each smart grid gateway is Δ t；The position of j-th of smart grid gateway is (xj,yj,zj), it produces
Life is using x, y, z, Δ t as the first relational expression of unknown quantity:
By first relational expression by Taylor expansion, following second relational expression is obtained:Wherein,It is that the intelligent electric meter is whole
The calculating pseudorange at end and each smart grid gateway, ρjIt is the intelligent electric meter terminal and each smart grid gateway
Measurement pseudorange,For the estimated location of the intelligent electric meter terminal, [Δ xu Δyu Δzu] it is described
The position correction amount of intelligent electric meter terminal, and unknown quantity to be solved, Δ tuIt is time complexity curve amount；Second relational expression is parsed,
The position for obtaining the intelligent electric meter terminal is (x, y, z).
The present invention also provides a kind of intelligent electric meter Terminal Position Location System, which is used in intelligence
Positioning intelligent ammeter terminal in energy power grid, which is characterized in that the intelligent electric meter Terminal Position Location System includes: intelligent electric meter terminal
With multiple smart grid gateways.Intelligent electric meter terminal is for sending Chirp signal.Multiple smart grid gateways and the intelligence electricity
It is carried out wireless communication between meter terminal, each smart grid gateway is used to receive what the intelligent electric meter terminal was sent
Chirp signal, and the Chirp signal that receives gone out according to the information reconstruction of the Chirp signal received and goes out the reproduction
Chirp signal and the smart grid gateway are sent to the intelligent electric meter to the processing delay information of Chirp signal jointly
Terminal.Wherein, the intelligent electric meter terminal is also used in the Chirp signal for receiving each smart grid gateway passback
Afterwards, itself and each intelligence electricity are calculated according to the information of the Chirp signal received and the processing delay information
The distance of net gateway, and the intelligent electric meter terminal is counted according to the position of the distance and each smart grid gateway
Calculate the position of itself.
In a preferred embodiment, the intelligent electric meter terminal includes: the first sending module and the first receiving module.
First sending module includes Chirp signal generation module and control module, and it is raw that the control module controls the Chirp signal
At module generate Chirp signal, and by the Chirp signal generation module generate Chirp signal carry out Frequency mixing processing to
Radiofrequency signal is obtained, and sends the radiofrequency signal.First receiving module is returned for receiving and processing the smart grid gateway
The Chirp signal of biography.
In a preferred embodiment, the smart grid gateway includes: the second receiving module and reproduction sending module.
Second receiving module is used to receive and process the Chirp signal that the intelligent electric meter terminal is sent.Reappear sending module with it is described
Second receiving module is coupled, and the information reconstruction of the Chirp signal for being received according to second receiving module goes out to receive
The processing delay of the Chirp signal that arrives and the Chirp signal for going out the reproduction and the smart grid gateway to Chirp signal
Information is sent to the intelligent electric meter terminal jointly.
In a preferred embodiment, the intelligent electric meter terminal receives each smart grid gateway passback
After Chirp signal, itself and each intelligence are calculated according to the information of the Chirp signal received and the processing delay information
Can the distance of power grid gateway include: that the intelligent electric meter terminal receives and processes each smart grid gateway and returns
Chirp signal obtains the frequency f of each Chirp signaljWith phase pj, while received signal is filtered and is demodulated to
Obtain the processing delay information Δ T of each smart grid gatewayj；Obtain the intelligent electric meter terminal currently newest transmission
The frequency f0 of Chirp signal, and Chirp signal frequency change rate u is combined, the Chirp signal is obtained from the intelligent electric meter
One-way transmission time [(f0-f of the terminal to each smart grid gatewayj)/u-ΔTj]/2；It is whole to calculate the intelligent electric meter
End and each smart grid gateway distance Rj, Rj=c [(f0-fj)/u-ΔTj]/2, wherein c is the light velocity.
In a preferred embodiment, the intelligent electric meter terminal is according to the distance and each smart grid
The position that the position of gateway calculates itself includes: to set the position of the intelligent electric meter terminal as (x, y, z), the intelligent electric meter
The clocking error of terminal and each smart grid gateway is Δ t；The position of j-th of smart grid gateway is (xj,yj,
zj), it generates using x, y, z, Δ t as the first relational expression of unknown quantity:
By first relational expression by Taylor expansion, following second relational expression is obtained:Wherein,It is the intelligent electric meter terminal and every
The calculating pseudorange of a smart grid gateway, ρjIt is the measurement of the intelligent electric meter terminal Yu each smart grid gateway
Pseudorange,For the estimated location of the intelligent electric meter terminal, [Δ xu Δyu Δzu] it is the intelligence electricity
The position correction amount of meter terminal, and unknown quantity to be solved, Δ tuIt is time complexity curve amount；Second relational expression is parsed, institute is obtained
The position for stating intelligent electric meter terminal is (x, y, z).
Compared with prior art, intelligent electric meter method of locating terminal according to the present invention and system, certainly using ammeter terminal
Master positioning sends Chirp signal to neighbouring power grid gateway by ammeter terminal, and progress is accurate same after power grid gateway receives the signal
Step, reappears the signal and returns to electric network terminal, electric network terminal according between signal frequency measure of the change and power grid gateway away from
From in conjunction with known power grid gateway location, terminal self-position can be obtained, power grid gateway reproduction signal simultaneously returns, guarantees
The signal that power grid gateway is sent has sufficiently high signal-to-noise ratio, while sending processing delay information, so that intelligent terminal can be with
Range error is corrected, can be improved measurement accuracy, and the shadow that ranging inhibits multipath to a certain extent is changed according to frequency
It rings.Therefore compared to satellite positioning method, cost is substantially reduced, and is more applicable for for the intelligent electric meter method of locating terminal and system
Smart grid large-scale application, and compared to RSSI ranging localization, multi-path influence is smaller, and positioning accuracy is higher, reliability
It is higher.
Detailed description of the invention
Fig. 1 is the flow chart of intelligent electric meter method of locating terminal according to an embodiment of the present invention；
Fig. 2 is the schematic diagram of intelligent electric meter Terminal Position Location System according to an embodiment of the present invention；
Fig. 3 is the emulation knot of RSSI distance-measuring and positioning method and localization method of the invention according to an embodiment of the present invention
Fruit is compared.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in detail, it is to be understood that guarantor of the invention
Shield range is not limited by the specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " includes " or its change
Changing such as "comprising" or " including " etc. will be understood to comprise stated element or component, and not exclude other members
Part or other component parts.
In order to which the disadvantage for overcoming above-mentioned satellite positioning method at high cost and above-mentioned RSSI ranging localization range error are big
Disadvantage, the present invention provide a kind of intelligent electric meter method of locating terminal and system, and positioning accuracy is higher, cost is lower and reliability
It is higher.
The principle of the present invention is to send chirp signal to neighbouring power grid by ammeter terminal using ammeter terminal autonomous positioning
Gateway, power grid gateway carry out precise synchronization after receiving the signal, reappear the signal and return to ammeter terminal, ammeter terminal according to
Ammeter terminal self-position and clock can be obtained in conjunction with known power grid gateway location in signal frequency measure of the change distance
Error.Gateway passback guarantees that signal has sufficiently high signal-to-noise ratio, is inhibited to a certain extent according to frequency variation ranging more
The influence of diameter.
Fig. 1 is intelligent electric meter method of locating terminal according to an embodiment of the present invention, the intelligent electric meter terminal positioning side
Method includes step S1~S4.
In step sl, intelligent electric meter terminal sends Chirp signal.
In step s 2, multiple smart grid gateways receive and reappear Chirp signal: each smart grid gateway acquisition connects
The precise frequency and phase information of the Chirp signal received, reappear the Chirp signal received out and by the reproduction go out
Chirp signal and smart grid gateway are sent to intelligent electric meter terminal to the processing delay information of Chirp signal jointly.The step
In rapid, when can guarantee that intelligent electric meter terminal can receive sufficiently strong signal by reappearing Chirp signal, while send processing
Prolong information, intelligent terminal is allowed to correct range error, can be improved measurement accuracy.
In step s3, intelligent electric meter terminal calculates the distance between each smart grid gateway Rj: intelligent electric meter is whole
After termination receives the Chirp signal of each smart grid gateway passback, according to the information and processing of the Chirp signal received
Delay calculates itself and each smart grid gateway distance Rj。
In one embodiment, after intelligent electric meter terminal receives the Chirp signal that each smart grid gateway returns, root
Itself packet at a distance from each smart grid gateway is calculated according to the information and processing delay information of the Chirp signal received
Include: intelligent electric meter terminal receives and processes the Chirp signal of each smart grid gateway passback, obtains each Chirp signal
Frequency fjWith phase pj, while received signal is filtered and is demodulated thus when obtaining the processing of each smart grid gateway
Prolong information Δ Tj；The frequency f0 of the Chirp signal of intelligent electric meter terminal currently newest transmission is obtained, and combines Chirp signal frequency
Rate change rate u obtains one-way transmission time [(f0- of the Chirp signal from intelligent electric meter terminal to each smart grid gateway
fj)/u-ΔTj]/2；Computational intelligence ammeter terminal and each smart grid gateway distance Rj, Rj=c [(f0-fj)/u-ΔTj]/
2, wherein c is the light velocity.In this embodiment, changed by frequency and obtain transmission time and ranging, receive signal frequency by with
Track loop provides, and precision is higher after completing locking, and currently transmitted frequency is provided by local intelligent ammeter terminal, therefore range accuracy
It is higher.
In step s 4, intelligent electric meter terminal is according to distance RjAnd the position of each smart grid gateway calculates itself
Position.
In one embodiment, intelligent electric meter terminal calculates according to the position of distance and each smart grid gateway and comes from
The position of body includes: to set the position of intelligent electric meter terminal as (x, y, z), intelligent electric meter terminal and each smart grid gateway when
Clock error is Δ t；The position of j-th of smart grid gateway is (xj,yj,zj), it generates using x, y, z, Δ t as the first of unknown quantity
Relational expression:First relational expression is passed through into Taylor's exhibition
It opens, obtains following second relational expression:Its
In,It is the calculating pseudorange of intelligent electric meter terminal Yu each smart grid gateway, ρjIt is intelligent electric meter terminal and each intelligence electricity
The measurement pseudorange of net gateway,For the estimated location of intelligent electric meter terminal, [Δ xu Δyu Δzu] it is intelligence
The position correction amount of energy ammeter terminal, and unknown quantity to be solved, Δ tuIt is time complexity curve amount；The second relational expression is parsed, intelligence is obtained
The position of energy ammeter terminal is (x, y, z).It should be noted that needing to solve the three of intelligent electric meter terminal in the present embodiment
Dimension position, unknown quantity to be solved totally 4, including x, y, z, Δ t, need at least 4 group of second relational expression to solve, therefore desired signal
The number for the smart grid gateway that intensity is met the requirements should at least four.If only needing to orient in other embodiments
The two-dimensional position of intelligent electric meter terminal, then unknown quantity to be solved can reduce 1, need at least 3 group of second relational expression to solve, therefore
The number for the smart grid gateway that desired signal intensity is met the requirements should at least three.
Fig. 1 is intelligent electric meter Terminal Position Location System according to an embodiment of the present invention, the intelligent electric meter terminal positioning system
System includes: intelligent electric meter terminal 10 and 4 smart grid gateways 11.
Intelligent electric meter terminal 10 is for sending Chirp signal.
It is carried out wireless communication between 4 smart grid gateways 11 and intelligent electric meter terminal 10, each smart grid gateway 11
For receiving the Chirp signal of the transmission of intelligent electric meter terminal 10, and according to the precise frequency and phase of the Chirp signal received
Information reconstruction goes out the Chirp signal received and the Chirp signal and smart grid gateway 11 for going out the reproduction believe Chirp
Number processing delay information be sent to intelligent electric meter terminal 10 jointly.
Intelligent electric meter terminal 10 is also used to after receiving the Chirp signal that each smart grid gateway 11 returns, according to
The information and processing delay information of the Chirp signal received calculate itself at a distance from each smart grid gateway 11,
And intelligent electric meter terminal 10 is according to this distance and the position of each smart grid gateway 11 calculates itself position.
In one embodiment, intelligent electric meter terminal 10 includes: the first sending module 10a and the first receiving module 10b.The
One sending module 10a includes Chirp signal generation module 10a1 and control module 10a2, and control module 10a2 controls Chirp
Signal generation module 10a1 generates Chirp signal, and the Chirp signal generation module 10a1 Chirp signal generated is mixed
Frequency processing sends radiofrequency signal to each smart grid gateway 11 to obtain radiofrequency signal.First receiving module 10b is used for
Receive and process the Chirp signal of the passback of smart grid gateway 11.
In one embodiment, smart grid gateway 11 includes: the second receiving module 11a and reproduction sending module 11b.
Second receiving module 11a is used to receive and process the Chirp signal of the transmission of intelligent electric meter terminal 10.Reappear sending module 11b to use
Go out the Chirp signal that receives in the information reconstruction of the Chirp signal received according to the second receiving module 11a and by the reproduction
Chirp signal and smart grid gateway 11 out is sent to intelligent electric meter end to the processing delay information of Chirp signal jointly
End 10.
In one embodiment, intelligent electric meter terminal 10 receives the Chirp signal that each smart grid gateway 11 returns
Afterwards, itself and each smart grid gateway 11 are calculated according to the information of the Chirp signal received and processing delay information
Distance include: that the first receiving module 10b of intelligent electric meter terminal 10 receives and processes what each smart grid gateway 11 returned
Chirp signal obtains the frequency f of each Chirp signaljWith phase pj, while received signal is filtered and is demodulated to
Obtain the processing delay information Δ T of each smart grid gateway 11j。
Control module 10a2 obtains the frequency f0 of the Chirp signal of the current newest transmission of intelligent electric meter terminal 10, and combines
Chirp signal frequency change rate u obtains Chirp signal from intelligent electric meter terminal 10 to the unidirectional of each smart grid gateway 11
Transmission time [(f0-fj)/u-ΔTj]/2。
Computational intelligence ammeter terminal 10 and each 11 distance R of smart grid gatewayj=c [(f0-fj)/u-ΔTj]/2,
Middle c is the light velocity.
In one embodiment, it includes: to set intelligent electric meter terminal 10 that intelligent electric meter terminal 10, which calculates the position of itself,
Position is (x, y, z), and the clocking error of intelligent electric meter terminal 10 and each smart grid gateway 11 is Δ t；J-th of smart grid
The position of gateway 11 is (xj,yj,zj), it generates using x, y, z, Δ t as the first relational expression of unknown quantity:By the first relational expression by Taylor expansion, following second is obtained
Relational expression:Wherein,It is intelligent electric meter terminal
10 with the calculating pseudorange of each smart grid gateway 11, ρjIt is the measurement of intelligent electric meter terminal 10 Yu each smart grid gateway 11
Pseudorange,For the estimated location of intelligent electric meter terminal 10, [Δ xu Δyu Δzu] it is intelligent electric meter terminal
10 position correction amount, and unknown quantity to be solved, Δ tuIt is time complexity curve amount；The second relational expression is parsed, intelligent electric meter end is obtained
The position at end 10 is (x, y, z).
In order to preferably carry out compliance test result, RSSI distance-measuring and positioning method and localization method of the invention are imitated respectively
Very, simulation result is as shown in Figure 3.It can be seen from the figure that, because signal decaying is larger, being caused using RSSI distance-measuring and positioning method
Range error is big, and position error is larger, and the range error and position error of localization method of the invention are smaller.
In conclusion intelligent electric meter method of locating terminal and system according to the present embodiment, autonomous using ammeter terminal
Positioning sends Chirp signal to neighbouring power grid gateway by ammeter terminal, and power grid gateway carries out precise synchronization after receiving the signal,
Reappear the signal and return to electric network terminal, electric network terminal according to the distance between signal frequency measure of the change and power grid gateway,
In conjunction with known power grid gateway location, terminal self-position can be obtained, power grid gateway reproduction signal simultaneously returns, and ensure that electricity
The signal that net gateway is sent has sufficiently high signal-to-noise ratio, while sending processing delay information, and intelligent terminal is corrected
Range error can be improved measurement accuracy, and change the influence that ranging inhibits multipath to a certain extent according to frequency.Cause
Compared to satellite positioning method, cost is substantially reduced, and is more applicable for intelligence for this intelligent electric meter method of locating terminal and system
Power grid large-scale application, and compared to RSSI ranging localization, multi-path influence is smaller, and positioning accuracy is higher, and reliability is higher.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The aforementioned description to specific exemplary embodiment of the invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explaining specific principle of the invention and its actually answering
With so that those skilled in the art can be realized and utilize a variety of different exemplary implementation schemes of the invention and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (8)
1. a kind of intelligent electric meter method of locating terminal, which is used for the positioning intelligent in smart grid
Ammeter terminal, which is characterized in that the intelligent electric meter method of locating terminal includes:
Intelligent electric meter terminal sends Chirp signal；
Multiple smart grid gateways receive the Chirp signal that the intelligent electric meter terminal is sent, each smart grid gateway
Go out the Chirp signal that receives according to the information reconstruction of the Chirp signal received and the Chirp signal that goes out the reproduction and
The smart grid gateway is sent to the intelligent electric meter terminal to the processing delay information of Chirp signal jointly；
After the intelligent electric meter terminal receives the Chirp signal of each smart grid gateway passback, according to what is received
The information of Chirp signal and the processing delay information calculate itself at a distance from each smart grid gateway；With
And
The intelligent electric meter terminal calculates the position of itself according to the position of the distance and each smart grid gateway
It sets.
2. intelligent electric meter method of locating terminal as described in claim 1, which is characterized in that the intelligent electric meter terminal receives
After the Chirp signal of each smart grid gateway passback, according to the information and the processing of the Chirp signal received
Delay calculates itself
The intelligent electric meter terminal receives and processes the Chirp signal of each smart grid gateway passback, obtains each
The frequency f of Chirp signaljWith phase pj, while received signal is filtered and is demodulated to obtain each intelligence electricity
The processing delay information Δ T of net gatewayj；
The frequency f0 of the Chirp signal of the intelligent electric meter terminal currently newest transmission is obtained, and Chirp signal frequency is combined to become
Rate u obtains the Chirp signal from the intelligent electric meter terminal to the one-way transmission time of each smart grid gateway
[(f0-fj)/u-ΔTj]/2；And
Calculate the intelligent electric meter terminal and each smart grid gateway distance Rj, Rj=c [(f0-fj)/u-ΔTj]/2,
Wherein c is the light velocity.
3. intelligent electric meter method of locating terminal as claimed in claim 2, which is characterized in that the intelligent electric meter terminal is according to institute
The position for stating distance and each smart grid gateway calculates itself position and includes:
If the position of the intelligent electric meter terminal is (x, y, z), the intelligent electric meter terminal and each smart grid gateway
Clocking error be Δ t；The position of j-th of smart grid gateway is (xj,yj,zj), it is unknown for generating with x, y, z, Δ t
First relational expression of amount:
By first relational expression by Taylor expansion, following second relational expression is obtained:Wherein,It is that the intelligent electric meter is whole
The calculating pseudorange at end and each smart grid gateway, ρjIt is the intelligent electric meter terminal and each smart grid gateway
Measurement pseudorange,For the estimated location of the intelligent electric meter terminal, [Δ xu Δyu Δzu] it is described
The position correction amount of intelligent electric meter terminal, and unknown quantity to be solved, Δ tuIt is time complexity curve amount；And
Second relational expression is parsed, the position for obtaining the intelligent electric meter terminal is (x, y, z).
4. a kind of intelligent electric meter Terminal Position Location System, which is used for the positioning intelligent in smart grid
Ammeter terminal, which is characterized in that the intelligent electric meter Terminal Position Location System includes:
Intelligent electric meter terminal, for sending Chirp signal；And
It is carried out wireless communication between multiple smart grid gateways, with the intelligent electric meter terminal, each smart grid gateway
The Chirp signal sent for receiving the intelligent electric meter terminal, and go out to connect according to the information reconstruction of the Chirp signal received
When the Chirp signal that receives and the Chirp signal for going out the reproduction and the smart grid gateway are to the processing of Chirp signal
Prolong information and is sent to the intelligent electric meter terminal jointly；
Wherein, the intelligent electric meter terminal is also used to after the Chirp signal for receiving each smart grid gateway passback,
Itself and each smart grid net are calculated according to the information of the Chirp signal received and the processing delay information
The distance of pass, and the intelligent electric meter terminal is calculated according to the position of the distance and each smart grid gateway
The position of itself.
5. intelligent electric meter Terminal Position Location System as claimed in claim 4, which is characterized in that the intelligent electric meter terminal includes:
First sending module, including Chirp signal generation module and control module, the control module control the Chirp
Signal generation module generates Chirp signal, and the Chirp signal that the Chirp signal generation module generates is carried out at mixing
Reason sends the radiofrequency signal to obtain radiofrequency signal；And
First receiving module, for receiving and processing the Chirp signal of the smart grid gateway passback.
6. intelligent electric meter Terminal Position Location System as claimed in claim 4, which is characterized in that the smart grid gateway includes:
Second receiving module, the Chirp signal sent for receiving and processing the intelligent electric meter terminal；And
Reappear sending module, is coupled with second receiving module, for what is received according to second receiving module
The Chirp signal that the information reconstruction of Chirp signal receives out and the Chirp signal for going out the reproduction and the smart grid
Gateway is sent to the intelligent electric meter terminal to the processing delay information of Chirp signal jointly.
7. intelligent electric meter Terminal Position Location System as claimed in claim 4, which is characterized in that the intelligent electric meter terminal receives
After the Chirp signal of each smart grid gateway passback, according to the information and the processing of the Chirp signal received
Delay calculates itself
The intelligent electric meter terminal receives and processes the Chirp signal of each smart grid gateway passback, obtains each
The frequency f of Chirp signaljWith phase pj, while received signal is filtered and is demodulated to obtain each intelligence electricity
The processing delay information Δ T of net gatewayj；
The frequency f0 of the Chirp signal of the intelligent electric meter terminal currently newest transmission is obtained, and Chirp signal frequency is combined to become
Rate u obtains the Chirp signal from the intelligent electric meter terminal to the one-way transmission time of each smart grid gateway
[(f0-fj)/u-ΔTj]/2；And
Calculate the intelligent electric meter terminal and each smart grid gateway distance Rj, Rj=c [(f0-fj)/u-ΔTj]/2,
Wherein c is the light velocity.
8. intelligent electric meter Terminal Position Location System as claimed in claim 7, which is characterized in that the intelligent electric meter terminal is according to institute
The position for stating distance and each smart grid gateway calculates itself position and includes:
If the position of the intelligent electric meter terminal is (x, y, z), the intelligent electric meter terminal and each smart grid gateway
Clocking error be Δ t；The position of j-th of smart grid gateway is (xj,yj,zj), it is unknown for generating with x, y, z, Δ t
First relational expression of amount:
By first relational expression by Taylor expansion, following second relational expression is obtained:Wherein,It is the intelligent electric meter terminal and every
The calculating pseudorange of a smart grid gateway, ρjIt is the measurement of the intelligent electric meter terminal Yu each smart grid gateway
Pseudorange,For the estimated location of the intelligent electric meter terminal, [Δ xu Δyu Δzu] it is the intelligence electricity
The position correction amount of meter terminal, and unknown quantity to be solved, Δ tuIt is time complexity curve amount；And
Second relational expression is parsed, the position for obtaining the intelligent electric meter terminal is (x, y, z).
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