CN103167608B - A kind of localization method based on feedback radio frequency loss estimated distance and base station - Google Patents
A kind of localization method based on feedback radio frequency loss estimated distance and base station Download PDFInfo
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- CN103167608B CN103167608B CN201310098442.XA CN201310098442A CN103167608B CN 103167608 B CN103167608 B CN 103167608B CN 201310098442 A CN201310098442 A CN 201310098442A CN 103167608 B CN103167608 B CN 103167608B
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Abstract
The present invention relates to field of radio frequency identification, disclose a kind of localization method based on feedback radio frequency loss estimated distance and base station.The method comprises: base station sends carrier wave to mobile tag, and receives the packet of feedback; According to data in packet, the first radiofrequency propagation loss between calculation base station and mobile tag; Inquire about the propagation loss mapping table that the transmitted power of this carrier wave is corresponding, if the first radiofrequency propagation loss is not in this propagation loss mapping table, then reduce the transmitted power of carrier wave, again send carrier wave to mobile tag, return step: the packet receiving mobile tag feedback; Otherwise, according to the received signal strength of data, base station in packet, calculate the second radiofrequency propagation loss; In conjunction with the data in propagation loss mapping table, adopt linear difference method, calculate distance between the two.Employing the technical program can according to the radio frequency loss estimated distance of feedback, and Automatic adjusument radio frequency transmitted power improves the accuracy of location, reduces error.
Description
Technical field
The present invention relates to field of radio frequency identification, particularly a kind of localization method based on feedback radio frequency loss distance estimations and base station.
Background technology
Along with the development of Internet of Things, Internet of Things location starts to be paid close attention to widely and apply.In existing Internet of Things location technology, REID (Radio Frequency Identification is called for short RFID) is often adopted to position.The localization method of the wireless sensor network based on RSSI that the patent No. 201010134769.4 proposes, range information is between the two obtained according to the RSSI (Received Signal StrengthIndication, received signal strength) of tested point and anchor node.Anchor node, by sending fixing power and receiving the power of tested point feedback, calculates the corresponding distance of tested point according to propagation loss.
But, the minor variations of tested point distance just causes the larger change of loss when the distance is small, and the change that propagation loss is adjusted the distance when distant is insensitive, meanwhile, the propagation loss that remote unobstructed direct-view is seen and in-plant have stop as equal in propagation losses such as walls or close to time, very large error can be produced, and in Practical Project, node to be measured and anchor node all at direct-view atmosphere, can not reflect because stopping, the multipath fading loss etc. that reflection etc. causes.Therefore the accuracy adopting this technical scheme to position is not high, error is comparatively large, and practicality is not strong.
Summary of the invention
The embodiment of the present invention first object is to provide a kind of localization method based on feedback radio frequency loss estimated distance, adopt the technical program can estimate the distance of mobile tag according to the radio frequency loss of feedback, Automatic adjusument radio frequency transmitted power, improves the accuracy of location, reduces error.
The embodiment of the present invention second object is to provide a kind of base station, and adopt the technical program can estimate the distance of mobile tag according to the radio frequency loss of feedback, Automatic adjusument radio frequency transmitted power, improves the accuracy of location, reduces error.
First aspect, the invention provides a kind of localization method based on feedback radio frequency loss estimated distance, comprising:
Base station sends carrier wave to mobile tag, and receives the packet of described mobile tag feedback;
Wherein, described packet comprises information: the transmitted power that the identify label of described mobile tag, described mobile tag use when sending described packet, received signal strength when described mobile tag receives described carrier wave;
Received signal strength when described base station receives described carrier wave according to the described mobile tag comprised in the transmitted power of described carrier wave and described packet, calculates the first radiofrequency propagation loss between described base station and described mobile tag;
Described base station is according to described first radiofrequency propagation loss, inquire about the propagation loss mapping table that the transmitted power of described carrier wave is corresponding, described propagation loss mapping table is: the propagation loss between described base station and described mobile tag and the mapping relations table between effective coverage distance of described carrier wave;
If described first radiofrequency propagation loss is higher than the propagation loss upper limit of described propagation loss mapping table or the propagation loss lower limit lower than described propagation loss mapping table,
Then described base station reduces the transmitted power of described carrier wave, again sends described carrier wave to described mobile tag, returns step: the packet receiving described mobile tag feedback; Wherein, described base station sends the transmitted power of described carrier wave is for the first time the maximum transmit power that described base station allows;
If described first radiofrequency propagation loss is lower than the propagation loss upper limit of described propagation loss mapping table and the propagation loss lower limit higher than described propagation loss mapping table,
Transmitted power when then base station sends described packet according to described mobile tag, received signal strength when to receive described packet with described base station, calculate the second radiofrequency propagation loss between described base station and described mobile tag;
According to the data in the value of described second radiofrequency propagation loss and described propagation loss mapping table, adopt linear difference method, calculate the distance between described base station and described mobile tag, to determine the position of described mobile tag.
In conjunction with first aspect, under the first implementation, in the described distance calculating described base station and described mobile tag, after the position determining described mobile tag, also comprise:
Described base station sends localization message to navigation system, and wherein, described localization message comprises: the identify label of described base station, the identify label of described mobile tag, distance between described base station and described mobile tag and temporal information,
For described navigation system according at least three identify labels with identical described mobile tag and the described localization message of identify label with different described base station, calculate that to obtain described mobile tag current relative to the plane coordinates between at least three described base stations.
Second aspect, the invention provides a kind of base station, comprising:
Radio-frequency (RF) transceiver, for sending carrier wave to mobile tag, and receives the packet of described mobile tag feedback;
Wherein, described packet comprises information: the transmitted power that the identify label of described mobile tag, described mobile tag use when sending described packet, received signal strength when described mobile tag receives described carrier wave;
Calculator, for receiving received signal strength during described carrier wave according to the described mobile tag comprised in the transmitted power of described carrier wave and described packet, calculates the first radiofrequency propagation loss between described base station and described mobile tag,
And for inquiring about propagation loss mapping table at inquiry determiner, determine that described first radiofrequency propagation loss is prescribed a time limit lower than the propagation loss upper limit of described propagation loss mapping table and higher than under the propagation loss of described propagation loss mapping table, transmitted power when sending described packet according to described mobile tag, received signal strength when to receive described packet with described base station, calculate the second radiofrequency propagation loss between described base station and described mobile tag
And for according to the data in the value of described second radiofrequency propagation loss and described propagation loss mapping table, adopt linear difference method, calculate the distance between described base station and described mobile tag, to determine the position of described mobile tag;
Wherein, described propagation loss mapping table is: the propagation loss between described base station and described mobile tag and the mapping relations table between effective coverage distance of described carrier wave;
Described inquiry determiner, for according to described first radiofrequency propagation loss, inquires about the propagation loss mapping table that the transmitted power of described carrier wave is corresponding, determines described first radiofrequency propagation loss whether in described loss mapping table within the propagation loss upper limit and lower limit;
Described radio-frequency (RF) transceiver also for: described inquiry determiner determine described first radiofrequency propagation loss higher than the propagation loss upper limit of described propagation loss mapping table or lower than the propagation loss of described propagation loss mapping table under in limited time, reduce the transmitted power of described carrier wave, again send described carrier wave to described mobile tag, wherein, described base station sends the transmitted power of described carrier wave is for the first time the maximum transmit power that described base station allows.
In conjunction with second aspect, under the first implementation, described radio-frequency (RF) transceiver also for: to navigation system send localization message, wherein, described localization message comprises: the identify label of described base station, the identify label of described mobile tag, distance between described base station and described mobile tag and temporal information
For described navigation system according at least three identify labels with identical described mobile tag and the described localization message of identify label with different described base station, calculate that to obtain described mobile tag current relative to the plane coordinates between at least three described base stations.
Therefore, compared to adopting fixing transmitted power in prior art, determine distance according to the radiofrequency propagation loss between base station and mobile tag, due to radiofrequency propagation loss and propagation distance and non-linear relation, the distance accuracy determined is not high, there is larger error.And adopt technical solution of the present invention, base station sends carrier wave to mobile tag, according to the packet of mobile tag feedback, calculates the first radiofrequency propagation loss, and inquire about propagation loss mapping table, determine in the effective coverage range of this mobile tag whether under this transmitted power.If not, then according to the transmitted power reducing carrier wave, again send carrier wave, and again receive the packet of feedback, until determine in the effective coverage range of this mobile tag under this transmitted power.Then transmitted power when base station sends this packet according to this mobile tag that this packet comprises and this base station receive received signal strength during this packet, the second radiofrequency propagation loss between calculation base station and mobile tag.Base station, according to the data in the value of the second radiofrequency propagation loss and propagation loss mapping table, adopts linear difference method, calculates the distance between base station and mobile tag, to determine the position of mobile tag.
Although radiofrequency propagation loss and propagation distance non-linear relation, in the propagation distance of certain limit, radiofrequency propagation loss and propagation distance can be approximately linear.Received signal strength is deducted because propagation loss equals transmitted power, technical solution of the present invention is according to the radio frequency loss of feedback, regulate the radio frequency transmitted power of carrier wave, thus regulate the relation between radiofrequency propagation loss and propagation distance, different distances adopts different transmitted powers, both functional relations are converted into Decentralized Linear relation by non-linear relation, make in different intervals, radiofrequency propagation loss and propagation distance are all linear, adopt the distance of linear difference method calculation base station and mobile tag again, the accuracy of location can be improved, reduce error.
Further, own identification identifies by base station, mobile tag mark, temporal information and range information between the two send to navigation system, the range information that navigation system is identified about same mobile tag by least three base stations, determine the plane coordinates between current and these at least three base stations of this mobile tag, improve the accuracy of location further.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The schematic flow sheet of a kind of localization method based on feedback radio frequency loss estimated distance that Fig. 1 provides for the embodiment of the present invention 1;
The structural representation of a kind of base station that Fig. 2 provides for the embodiment of the present invention 2.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1:
See Fig. 1, present embodiments provide a kind of localization method based on feedback radio frequency loss estimated distance, be applicable to the target location management of Internet of Things.For example indoor positioning, cannot use satellite fix to carry out the sector application of target location management, as logistics, and prison, club, the home for the aged, large-scale industrial enterprise etc.
Its key step and principle as follows:
Step 101: base station sends carrier wave to mobile tag.
In the present embodiment, what base station was given tacit consent to sends carrier wave with maximum transmit power to mobile tag.Radio-frequency (RF) transmitter and the radio frequency receiver of base station work simultaneously, but channel staggers.On the frequency isolation basis ensureing more than 5Mhz, the spendable transmission frequency in micropower base station is Fi (i=1,2,3,4,5,6), and reception frequency is Fij (i=1,2,3,4,5,6; J=1,2,3,4,5 ... .12), corresponding 12 of each transmission frequency receives frequency, determines, just no longer change once send frequency, but reception frequency can realize frequency hopping by certain rule between 12 frequencies.Micropower base station adopts 6 transmission frequencies to guarantee, any spatially adjacent micropower base station can use different frequencies, avoids co-channel interference.
In the present embodiment, base station can be, but not limited to as micropower base station.
Step 102: the packet receiving this mobile tag feedback.
In the present embodiment, mobile tag before the movement, can enter silent status, do not send any radiofrequency signal, only when detecting that the motion of self just starts carrier detect, only when detecting micropower base station and existing, just can send radiofrequency signal to micropower base station.Concrete steps are:
During label power-up initializing, once the motion of mobile tag be detected, just start to detect Fi (i=1,2,3,4,5,6) respectively, detecting is spaced apart 1 second, and the detecting duration is 1 millisecond.When mobile tag detecting is less than any frequency, represent that mobile tag is not in base station range, label just enters dormancy again, and wait for label timing wake-up, whether tags detected moves again.
This mobile tag enters silent status and mobile tag can be avoided to continue to send radiofrequency signal or continuous reception radiofrequency signal, avoids battery pre-mature exhaustion, improves the working life of mobile tag.
Mobile tag is after this carrier wave of reception, can feed back a packet to base station, this packet comprises information to be had: the transmitted power that the identify label of this mobile tag, this mobile tag use when sending described packet, received signal strength when this mobile tag receives this carrier wave.
In the present embodiment, the frequency hopping rule that this base station allows the some Fij of the reception frequency used is comprised in this carrier wave.By hopping, mobile tag can ensure that multiple label does not disturb when mutual with micropower base station, also increase fail safe, effectively prevents eavesdropping and distorts label information.
Step 103: base station according to received signal strength during this mobile tag reception carrier comprised in the transmitted power of this carrier wave and packet, the first radiofrequency propagation loss between calculation base station and mobile tag.
In the present embodiment, because the propagation loss formula of wireless signal under free space is: Los=32.44+20lg (d)+20lg (f), wherein, Pout – Pin=Los, therefore Pout-Pin=32.44+20lg (d)+20lg (f).In formula, letter represents implication and is:
In the present embodiment, base station, according to received signal strength during this mobile tag reception carrier comprised in the transmitted power of this formula and carrier wave and packet, calculates the first radiofrequency propagation loss between described base station and described mobile tag.
Step 104: the propagation loss mapping table that the transmitted power of this carrier wave is corresponding, according to this first radiofrequency propagation loss, is inquired about in base station.
In the present embodiment, this propagation loss mapping table is: the mapping relations table between the propagation loss of base station and mobile tag and effective coverage distance of described carrier wave.
As the citing of the present embodiment, following form is wherein a kind of form:
Table one: base station sends radio-frequency power-20dBm, and maximum effective coverage range is radius 5 meters.
| Propagation loss Δ P unit dBm | Coverage radius r unit rice |
| ΔP11 | 1 |
| ΔP12 | 2 |
| ΔP13 | 3 |
| ΔP14 | 4 |
| ΔP15 | 5 |
Table two: base station sends radio-frequency power-5dBm, and maximum effective coverage range is radius 30 meters.
| Propagation loss Δ P unit dBm | Coverage radius r unit rice |
| ΔP21 | 10 |
| ΔP22 | 15 |
| ΔP23 | 20 |
| ΔP24 | 25 |
| ΔP25 | 30 |
Table three: base station sends radio-frequency power-0dBm, and maximum effective coverage range is radius 80 meters.
| Propagation loss Δ P unit dBm | Coverage radius r unit rice |
| ΔP31 | 40 |
| ΔP32 | 50 |
| ΔP33 | 60 |
| ΔP34 | 70 |
| ΔP35 | 80 |
In the present embodiment, the propagation loss mapping table that this transmitted power of base station inquiry is corresponding, confirms this mobile tag whether in the effective coverage range changing base station.
Step 105: this first radiofrequency propagation loss whether propagation loss upper limit higher than this propagation loss mapping table or propagation loss lower limit lower than this propagation loss mapping table, then perform step 106, otherwise, perform step 107.
In the present embodiment, if the propagation loss upper limit of this first radiofrequency propagation loss higher than this propagation loss mapping table or the propagation loss lower limit lower than this propagation loss mapping table, namely illustrate that this propagation loss is not in the scope of application of this mapping table.Due in the present embodiment, base station starts to give tacit consent to a maximum transmit power and sends carrier wave, therefore when propagation loss is prescribed a time limit higher than in the propagation loss of this propagation loss mapping table, has two kinds of contingent situations.One is the maximum effective coverage range that mobile tag has exceeded base station, and two is effective coverage ranges that mobile tag does not exceed base station, but the environment space between base station and mobile tag blocks a year wave propagation, causes propagation loss too high.
If this first radiofrequency propagation loss is lower than the propagation loss lower limit of this propagation loss mapping table, illustrate that this mobile tag is in the effective coverage range of base station, but as can be seen from formula, propagation loss not to increase with distance and linear growth, if by the distance of this first radiofrequency propagation loss calculation base station and mobile tag, have larger error, accuracy is not high.
Step 106: base station reduces the transmitted power of described carrier wave, returns step 101.
In the present embodiment, base station is according to each transmitted power in propagation loss mapping table, reduce transmitted power successively from big to small, until within the propagation loss upper limit of the first radiofrequency propagation loss drawn in the propagation loss mapping table that this transmitted power is corresponding and lower limit.Otherwise, reduce transmitted power, repeat, to mobile tag transmitted power, to return step 101.
Step 107: transmitted power when base station sends described packet according to this mobile tag, received signal strength when to receive this packet with base station, the second radiofrequency propagation loss of calculation base station and mobile tag.
In the present embodiment, if the first radiofrequency propagation loss is lower than the propagation loss upper limit of described propagation loss mapping table and the propagation loss lower limit higher than described propagation loss mapping table, transmitted power when then base station sends described packet according to this mobile tag, received signal strength when to receive this packet with base station, the second radiofrequency propagation loss of calculation base station and mobile tag.
Step 108: according to the data in the value of the second radiofrequency propagation loss and propagation loss mapping table, adopts linear difference method, calculates the distance between base station and mobile tag, to determine the position of mobile tag.
In the present embodiment, because this first radiofrequency propagation loss is in this propagation loss mapping table, this radiofrequency propagation loss meets the linear functional relation of this propagation loss mapping table, estimate and gather two values the most close with this second radiofrequency propagation loss in form and mapping value corresponding to this two values, adopt linear difference method, the distance between base station and mobile tag can be calculated, to determine the position of described mobile tag.
One as the present embodiment is illustrated, in the present embodiment, base station can be, but not limited to send localization message to navigation system, and wherein, this localization message comprises: the identify label of base station, the identify label of mobile tag, distance between base station and mobile tag and temporal information.This temporal information can be, but not limited to the positioning time into this mobile tag.Navigation system is according at least three identify labels with same mobile tag and this localization message of identify label with different base station, and this positioning time differed within four seconds, calculate this mobile tag of acquisition current relative to the plane coordinates between at least three base stations, determine the position of mobile tag further.
Therefore, compared to adopting fixing transmitted power in prior art, determine distance according to the radiofrequency propagation loss between base station and mobile tag, due to radiofrequency propagation loss and propagation distance and non-linear relation, the distance accuracy determined is not high, there is larger error.And adopt technical solution of the present invention, base station sends carrier wave to mobile tag, according to the packet of mobile tag feedback, calculates the first radiofrequency propagation loss, and inquire about propagation loss mapping table, determine in the effective coverage range of this mobile tag whether under this transmitted power.If not, then according to the transmitted power reducing carrier wave, again send carrier wave, and again receive the packet of feedback, until determine in the effective coverage range of this mobile tag under this transmitted power.Then transmitted power when base station sends this packet according to this mobile tag that this packet comprises and this base station receive received signal strength during this packet, calculate the second radiofrequency propagation loss of described base station and described mobile tag.Base station, according to the data in the value of described second radiofrequency propagation loss and described propagation loss mapping table, adopts linear difference method, calculates the distance of described base station and described mobile tag, to determine the position of described mobile tag.
Although radiofrequency propagation loss and propagation distance non-linear relation, in the propagation distance of certain limit, radiofrequency propagation loss and propagation distance can be approximately linear.Received signal strength is deducted because propagation loss equals transmitted power, technical solution of the present invention is according to the radio frequency loss of feedback, regulate the radio frequency transmitted power of carrier wave, thus regulate the relation between radiofrequency propagation loss and propagation distance, different distances adopts different transmitted powers, both functional relations are converted into Decentralized Linear relation by non-linear relation, make in different intervals, radiofrequency propagation loss and propagation distance are all linear, adopt the distance of linear difference method calculation base station and mobile tag again, the accuracy of location can be improved, reduce error.
Further, own identification identifies by base station, mobile tag mark, temporal information and range information between the two send to navigation system, the range information that navigation system is identified about same mobile tag by least three base stations, determine the plane coordinates between current and these at least three base stations of this mobile tag, improve the accuracy of location further.
Embodiment 2
See Fig. 2, the invention provides a kind of base station, this base station can be, but not limited to as micropower base station.This base station mainly comprises: radio-frequency (RF) transceiver 201, calculator 202, inquiry determiner 203.
Syndeton and the operation principle of its each parts are as follows:
Radio-frequency (RF) transceiver 201, for sending carrier wave to mobile tag, and receives the packet of this mobile tag feedback.Wherein, this packet comprises information: the transmitted power used when the identify label of mobile tag, mobile tag send this packet, mobile tag receive received signal strength during this carrier wave.
Calculator 202, is electrically connected with radio-frequency (RF) transceiver 201, for receiving received signal strength during this carrier wave according to the mobile tag comprised in the transmitted power of this carrier wave and this packet, the first radiofrequency propagation loss between calculation base station and mobile tag.
Calculator 202 is also for inquiring about propagation loss mapping table at inquiry determiner 203, prescribe a time limit under determining the propagation loss upper limit of the first radiofrequency propagation loss lower than this propagation loss mapping table and the propagation loss higher than this propagation loss mapping table, transmitted power when sending this packet according to mobile tag, received signal strength when to receive this packet with base station, the second radiofrequency propagation loss between calculation base station and mobile tag.Wherein, described propagation loss mapping table is: the propagation loss between described base station and described mobile tag and the mapping relations table between effective coverage distance of described carrier wave.
Calculator 202 also for according to the data in the value of the second radiofrequency propagation loss and propagation loss mapping table, adopts linear difference method, calculates the distance between base station and mobile tag, to determine the position of mobile tag.
Inquiry determiner 203, be electrically connected respectively with radio-frequency (RF) transceiver 101, calculator 202, for according to the first radiofrequency propagation loss, inquire about the propagation loss mapping table that the transmitted power of this carrier wave is corresponding, determine the first radiofrequency propagation loss whether in described loss mapping table within the propagation loss upper limit and lower limit.
Radio-frequency (RF) transceiver 201 also for: to determine under the propagation loss upper limit of the first radiofrequency propagation loss higher than this propagation loss mapping table or the propagation loss lower than this propagation loss mapping table in limited time at inquiry determiner 203, reduce the transmitted power of carrier wave, again send carrier wave to mobile tag.
The more operation principle of each device and content can be, but not limited to see the corresponding record in embodiment 1.
One as the present embodiment is illustrated, radio-frequency (RF) transceiver 201 also for: to navigation system send localization message, wherein, localization message comprises: the identify label of base station, the identify label of mobile tag, distance between described base station and described mobile tag and temporal information.Wherein, this temporal information can be, but not limited to the positioning time into this mobile tag.Navigation system has the identify label of this mobile tag identical according at least three and has this localization message of different base station identify label, and this positioning time is within 4 seconds, it is current relative to the plane coordinates between these at least three base stations that calculating acquisition changes mobile tag.
Therefore, compared to adopting fixing transmitted power in prior art, determine distance according to the radiofrequency propagation loss between base station and mobile tag, due to radiofrequency propagation loss and propagation distance and non-linear relation, the distance accuracy determined is not high, there is larger error.And adopt technical solution of the present invention, the radio-frequency (RF) transceiver 201 of base station sends carrier wave to mobile tag, according to the packet of mobile tag feedback, calculator 202 calculates the first radiofrequency propagation loss, inquire about propagation loss mapping table by inquiry determiner 203, determine in the effective coverage range of this mobile tag whether under this transmitted power.If not, then radio-frequency (RF) transceiver 201 is according to the transmitted power reducing carrier wave, again sends carrier wave, and again receives the packet of feedback, until determine in the effective coverage range of this mobile tag under this transmitted power.Then transmitted power when calculator 202 sends this packet according to this mobile tag that this packet comprises and this base station receive received signal strength during this packet, the second radiofrequency propagation loss between calculation base station and mobile tag.Finally, calculator 202, according to the data in the value of the second radiofrequency propagation loss and propagation loss mapping table, adopts linear difference method, calculates the distance of base station and mobile tag, to determine the position of mobile tag.
Although radiofrequency propagation loss and propagation distance non-linear relation, in the propagation distance of certain limit, radiofrequency propagation loss and propagation distance can be approximately linear.Received signal strength is deducted because propagation loss equals transmitted power, technical solution of the present invention is according to the radio frequency loss of feedback, regulate the radio frequency transmitted power of carrier wave, thus regulate the relation between radiofrequency propagation loss and propagation distance, different distances adopts different transmitted powers, both functional relations are converted into Decentralized Linear relation by non-linear relation, make in different intervals, radiofrequency propagation loss and propagation distance are all linear, adopt the distance of linear difference method calculation base station and mobile tag again, the accuracy of location can be improved, reduce error.
Further, own identification mark, mobile tag mark and distance between the two and temporal information are sent to navigation system by the radio-frequency (RF) transceiver 201 of base station.The range information that navigation system is identified about same mobile tag by least three base stations, and positioning time is in 4 seconds, calculates and determines that this mobile tag is current relative to the plane coordinates between at least three base stations, improves the accuracy of location further.
Device embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying performing creative labour, are namely appreciated that and implement.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that each execution mode can add required general hardware platform by software and realize, and can certainly pass through hardware.Based on such understanding, technique scheme can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product can store in a computer-readable storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment or embodiment.
Above-described execution mode, does not form the restriction to this technical scheme protection range.The amendment done within any spirit at above-mentioned execution mode and principle, equivalently to replace and improvement etc., within the protection range that all should be included in this technical scheme.
Claims (4)
1., based on a localization method for feedback radio frequency loss estimated distance, it is characterized in that, comprising:
Base station sends carrier wave to mobile tag, and receives the packet of described mobile tag feedback;
Wherein, described packet comprises information: the transmitted power that the identify label of described mobile tag, described mobile tag use when sending described packet, received signal strength when described mobile tag receives described carrier wave;
Received signal strength when described base station receives described carrier wave according to the described mobile tag comprised in the transmitted power of described carrier wave and described packet, calculates the first radiofrequency propagation loss between described base station and described mobile tag;
Described base station is according to described first radiofrequency propagation loss, inquire about the propagation loss mapping table that the transmitted power of described carrier wave is corresponding, described propagation loss mapping table is: the propagation loss between described base station and described mobile tag and the mapping relations table between effective coverage distance of described carrier wave;
If described first radiofrequency propagation loss is higher than the propagation loss upper limit of described propagation loss mapping table or the propagation loss lower limit lower than described propagation loss mapping table,
Then described base station reduces the transmitted power of described carrier wave, again sends described carrier wave to described mobile tag, returns step: the packet receiving described mobile tag feedback; Wherein, described base station sends the transmitted power of described carrier wave is for the first time the maximum transmit power that described base station allows;
If described first radiofrequency propagation loss is lower than the propagation loss upper limit of described propagation loss mapping table and the propagation loss lower limit higher than described propagation loss mapping table,
Transmitted power when then base station sends described packet according to described mobile tag, received signal strength when to receive described packet with described base station, calculate the second radiofrequency propagation loss between described base station and described mobile tag;
According to the data in the value of described second radiofrequency propagation loss and described propagation loss mapping table, adopt linear difference method, calculate the distance between described base station and described mobile tag, to determine the position of described mobile tag.
2. method according to claim 1, is characterized in that,
In the described distance calculating described base station and described mobile tag, after the position determining described mobile tag, also comprise:
Described base station sends localization message to navigation system, and wherein, described localization message comprises: the identify label of described base station, the identify label of described mobile tag, distance between described base station and described mobile tag and temporal information,
For described navigation system according at least three identify labels with identical described mobile tag and the described localization message of identify label with different described base station, calculate that to obtain described mobile tag current relative to the plane coordinates between at least three described base stations.
3. a base station, is characterized in that, comprising:
Radio-frequency (RF) transceiver, for sending carrier wave to mobile tag, and receives the packet of described mobile tag feedback;
Wherein, described packet comprises information: the transmitted power that the identify label of described mobile tag, described mobile tag use when sending described packet, received signal strength when described mobile tag receives described carrier wave;
Calculator, for receiving received signal strength during described carrier wave according to the described mobile tag comprised in the transmitted power of described carrier wave and described packet, calculates the first radiofrequency propagation loss between described base station and described mobile tag,
And for inquiring about propagation loss mapping table at inquiry determiner, determine that described first radiofrequency propagation loss is prescribed a time limit lower than the propagation loss upper limit of described propagation loss mapping table and higher than under the propagation loss of described propagation loss mapping table, transmitted power when sending described packet according to described mobile tag, received signal strength when to receive described packet with described base station, calculate the second radiofrequency propagation loss between described base station and described mobile tag
And for according to the data in the value of described second radiofrequency propagation loss and described propagation loss mapping table, adopt linear difference method, calculate the distance between described base station and described mobile tag, to determine the position of described mobile tag;
Wherein, described propagation loss mapping table is: the propagation loss between described base station and described mobile tag and the mapping relations table between effective coverage distance of described carrier wave;
Described inquiry determiner, for according to described first radiofrequency propagation loss, inquires about the propagation loss mapping table that the transmitted power of described carrier wave is corresponding, determines described first radiofrequency propagation loss whether in described loss mapping table within the propagation loss upper limit and lower limit;
Described radio-frequency (RF) transceiver also for: described inquiry determiner determine described first radiofrequency propagation loss higher than the propagation loss upper limit of described propagation loss mapping table or lower than the propagation loss of described propagation loss mapping table under in limited time, reduce the transmitted power of described carrier wave, again send described carrier wave to described mobile tag, wherein, described base station sends the transmitted power of described carrier wave is for the first time the maximum transmit power that described base station allows.
4. base station according to claim 3, is characterized in that,
Described radio-frequency (RF) transceiver also for: send localization message to navigation system, wherein, described localization message comprises: the identify label of described base station, the identify label of described mobile tag, distance between described base station and described mobile tag and temporal information,
For described navigation system according at least three identify labels with identical described mobile tag and the described localization message of identify label with different described base station, calculate that to obtain described mobile tag current relative to the plane coordinates between at least three described base stations.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310098442.XA CN103167608B (en) | 2013-03-25 | 2013-03-25 | A kind of localization method based on feedback radio frequency loss estimated distance and base station |
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| CN104767947A (en) * | 2014-01-07 | 2015-07-08 | 冠捷投资有限公司 | Electronic device controlled by radio frequency remote controller |
| CN104299016B (en) * | 2014-09-30 | 2018-02-02 | 小米科技有限责任公司 | Object positioning method and device |
| CN109525970B (en) * | 2018-10-29 | 2022-06-07 | 南京昆睿通信技术有限公司 | Method for realizing wireless terminal positioning in application plane |
| CN110381580B (en) * | 2019-07-25 | 2021-03-26 | 上海开域信息科技有限公司 | WiFi positioning method based on proportion optimization |
| CN113115439B (en) * | 2021-04-20 | 2023-06-13 | Oppo广东移动通信有限公司 | Positioning method and related equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008079626A1 (en) * | 2006-12-20 | 2008-07-03 | Intel Corporation | Mobile station localization apparatus, systems, and methods |
| CN101778463A (en) * | 2009-01-08 | 2010-07-14 | 中国移动通信集团公司 | Home base station and transmitting power setting method thereof |
| CN201674533U (en) * | 2010-06-02 | 2010-12-15 | 芜湖市第二人民医院 | Diagnosis guiding system of hospital |
| CN202383284U (en) * | 2011-09-19 | 2012-08-15 | 哈尔滨汇美恒科技开发有限公司 | Wireless monitoring locator |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008079626A1 (en) * | 2006-12-20 | 2008-07-03 | Intel Corporation | Mobile station localization apparatus, systems, and methods |
| CN101778463A (en) * | 2009-01-08 | 2010-07-14 | 中国移动通信集团公司 | Home base station and transmitting power setting method thereof |
| CN201674533U (en) * | 2010-06-02 | 2010-12-15 | 芜湖市第二人民医院 | Diagnosis guiding system of hospital |
| CN202383284U (en) * | 2011-09-19 | 2012-08-15 | 哈尔滨汇美恒科技开发有限公司 | Wireless monitoring locator |
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