CN103167608A - Positioning method and base station for estimating distance based on feedback radio frequency losses - Google Patents
Positioning method and base station for estimating distance based on feedback radio frequency losses Download PDFInfo
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- CN103167608A CN103167608A CN201310098442XA CN201310098442A CN103167608A CN 103167608 A CN103167608 A CN 103167608A CN 201310098442X A CN201310098442X A CN 201310098442XA CN 201310098442 A CN201310098442 A CN 201310098442A CN 103167608 A CN103167608 A CN 103167608A
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Abstract
The invention relates to a radio frequency identification field, and discloses a positioning method and a base station for estimating distance based on feedback radio frequency losses. The method includes: sending a carrier wave to a moving label and receiving a feedback data package through the base station; calculating a first radio frequency propagation loss between the base station and the moving label according to data in the data package; inquiring a propagation loss mapping table which sending power of the carrier wave corresponds to; if the first radio frequency propagation loss is not in the propagation loss mapping table, reducing the sending power of the carrier wave, sending the carrier wave to the moving label again, returning to the step of receiving the data package fed back by the moving label, and otherwise, calculating a second radio frequency propagation loss according to data in the data package and receipt signal intensity of the base station; and using a linear difference method to figure out the distance between the base station and the moving label according to data in the propagation loss mapping table. The positioning method and the base station can estimate the distance according to the feedback radio frequency losses, adaptively adjust radio frequency sending power, improve accuracy of positioning, and reduce errors.
Description
Technical field
The present invention relates to field of radio frequency identification, particularly a kind of localization method and base station based on feedback radio frequency loss distance estimations.
Background technology
Along with the development of Internet of Things, Internet of Things is located and is begun paid close attention to widely and use.In existing Internet of Things location technology, often adopt REID (Radio Frequency Identification is called for short RFID) to position.The localization method based on the wireless sensor network of RSSI that the patent No. 201010134769.4 proposes, according to the RSSI(Received Signal Strength Indication of tested point and anchor node, received signal strength) acquisition range information between the two.The power that anchor node is fixed by transmission and the power that receives the tested point feedback calculate the corresponding distance of tested point according to propagation loss.
But, just cause the larger variation of loss when the minor variations of distance hour tested point distance, and the variation that propagation loss is adjusted the distance when distant is insensitive, simultaneously, the propagation loss that remote unobstructed direct-view is seen and in-plant have stop as the propagation losses such as wall equate or near the time, can produce very large error, and in Practical Project, node to be measured and anchor node can not be all at the direct-view environment, because stopping refraction, the multipath fading loss that reflection etc. causes etc.Therefore the accuracy that adopts this technical scheme to position is not high, error is larger, and practicality is not strong.
Summary of the invention
The embodiment of the present invention the first purpose is to provide a kind of localization method based on feedback radio frequency loss estimated distance, adopt the technical program can estimate according to the radio frequency loss of feedback the distance of mobile tag, self adaptation is regulated the radio frequency transmitted power, improves the accuracy of location, reduces error.
The embodiment of the present invention the second purpose is to provide a kind of base station, adopts the technical program to estimate the distance of mobile tag according to the radio frequency loss of feedback, and self adaptation is regulated the 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:
The base station sends carrier wave to mobile tag, and receives the packet of described mobile tag feedback;
Wherein, described packet inclusion information: the transmitted power that the identify label of described mobile tag, described mobile tag use when sending described packet, the 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 that comprises in the transmitted power of described carrier wave and described packet calculates the first radio-frequency propagation loss between described base station and described mobile tag;
Described base station is according to described the first radio-frequency propagation loss, inquire about the propagation loss mapping table corresponding to transmitted power of described carrier wave, described propagation loss mapping table is: the propagation loss between described base station and described mobile tag, and effective coverage distance of described carrier wave between the mapping relations table;
If described the first radio-frequency propagation loss is higher than the propagation loss upper limit of described propagation loss mapping table or lower than the propagation loss lower limit of described propagation loss mapping table,
Described base station reduces the transmitted power of described carrier wave, again sends described carrier wave to described mobile tag, returns to step: the packet that receives described mobile tag feedback;
If described the first radio-frequency propagation loss is lower than the propagation loss upper limit of described propagation loss mapping table and higher than the propagation loss lower limit of described propagation loss mapping table,
Transmitted power when the base station sends described packet according to described mobile tag, the received signal strength when receiving described packet with described base station calculate the second radio-frequency propagation loss between described base station and described mobile tag;
According to the value of described the second radio-frequency propagation loss and the data in described propagation loss mapping table, adopt the 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 that calculates described base station and described mobile tag, after the position of determining described mobile tag, also comprise:
Described base station sends localization message to navigation system, and wherein, described localization message comprises: distance and temporal information between the identify label of described base station, the identify label of described mobile tag, described base station and described mobile tag,
According at least three described localization messages that have the identify label of identical described mobile tag and have the identify label of different described base stations, calculate the described mobile tag of acquisition current with respect to the plane coordinates between at least three described base stations for described navigation system.
Second aspect the invention provides a kind of base station, comprising:
Radio-frequency (RF) transceiver is used for sending carrier wave to mobile tag, and receives the packet of described mobile tag feedback;
Wherein, described packet inclusion information: the transmitted power that the identify label of described mobile tag, described mobile tag use when sending described packet, the received signal strength when described mobile tag receives described carrier wave;
Calculator, the received signal strength when being used for described mobile tag that transmitted power and described packet according to described carrier wave comprise and receiving described carrier wave calculates the first radio-frequency propagation loss between described base station and described mobile tag,
And be used at inquiry determiner inquiry propagation loss mapping table, determine that described the first radio-frequency propagation loss is lower than the propagation loss upper limit of described propagation loss mapping table and higher than prescribing a time limit under the propagation loss of described propagation loss mapping table, transmitted power when sending described packet according to described mobile tag, the received signal strength when receiving described packet with described base station, calculate the second radio-frequency propagation loss between described base station and described mobile tag
And be used for according to the value of described the second radio-frequency propagation loss and the data of described propagation loss mapping table, adopt the 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 effective coverage distance of described carrier wave between the mapping relations table;
Described inquiry determiner is used for according to described the first radio-frequency propagation loss, and the propagation loss mapping table corresponding to transmitted power of the described carrier wave of inquiry determines that described the first radio-frequency propagation loss is whether in described loss mapping table within the propagation loss upper limit and lower limit;
Described radio-frequency (RF) transceiver also is used for: determine described the first radio-frequency propagation loss higher than the propagation loss upper limit of described propagation loss mapping table or prescribe a time limit under lower than the propagation loss of described propagation loss mapping table at described inquiry determiner, reduce the transmitted power of described carrier wave, again send described carrier wave to described mobile tag.
In conjunction with second aspect, under the first implementation, described radio-frequency (RF) transceiver also is used for: send localization message to navigation system, wherein, described localization message comprises: distance and temporal information between the identify label of described base station, the identify label of described mobile tag, described base station and described mobile tag
According at least three described localization messages that have the identify label of identical described mobile tag and have the identify label of different described base stations, calculate the described mobile tag of acquisition current with respect to the plane coordinates between at least three described base stations for described navigation system.
Therefore, than the fixing transmitted power of available technology adopting, determine distance according to the radio-frequency propagation loss between base station and mobile tag, due to radio-frequency propagation loss and propagation distance and non-linear relation, that determines is not high apart from accuracy, has larger error.And the employing technical solution of the present invention, the base station sends carrier wave to mobile tag, according to the packet of mobile tag feedback, calculates the first radio-frequency propagation loss, and inquiry propagation loss mapping table, determine that this mobile tag is whether in the effective coverage range under this transmitted power.If not, according to the transmitted power that reduces 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.The received signal strength when transmitted power when then this mobile tag of comprising according to this packet of base station sends this packet and this base station receive this packet, the second radio-frequency propagation loss between calculation base station and mobile tag.The linear difference method is adopted according to the value of the second radio-frequency propagation loss and the data in the propagation loss mapping table in the base station, calculates the distance between base station and mobile tag, to determine the position of mobile tag.
Although radio-frequency propagation loss and propagation distance and non-linear relation,, in the propagation distance of certain limit, it is linear that radio-frequency propagation loss and propagation distance can be approximately.Because equaling transmitted power, propagation loss deducts received signal strength, technical solution of the present invention is according to the radio frequency loss of feedback, regulate the radio frequency transmitted power of carrier wave, thereby regulate the relation between radio-frequency propagation loss and propagation distance, different distances adopt different transmitted powers, both functional relations are converted into the Decentralized Linear relation by non-linear relation, make in different intervals, radio-frequency propagation loss and propagation distance are all linear, adopt again the distance of linear difference method calculation base station and mobile tag, can improve the accuracy of location, reduce error.
Further, the base station sends to navigation system with self identify label, mobile tag sign, temporal information and range information between the two, navigation system is by the range information of at least three base stations about same mobile tag sign, determine the plane coordinates between this mobile tag current and these at least three base stations, further improve the accuracy of location.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
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, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Embodiment 1:
Referring to Fig. 1, the present embodiment provides a kind of localization method based on feedback radio frequency loss estimated distance, is applicable to the target location management of Internet of Things.For example indoor positioning, can't use satellite fix to carry out the sector application that the target location is managed, as logistics, and prison, club, the home for the aged, large-scale industrial enterprise etc.
Its key step and principle are as follows:
Step 101: the base station sends carrier wave to mobile tag.
In the present embodiment, the base station acquiescence sends carrier wave with maximum transmit power to mobile tag.Radio-frequency (RF) transmitter and the radio frequency receiver of base station are worked simultaneously, but channel staggers.On the frequency isolation basis that guarantees more than 5Mhz, the spendable transmission frequency in micropower base station is Fi (i=1,2,3,4,5,6), and the reception frequency is Fij (i=1,2,3,4,5,6; J=1,2,3,4,5 ... .12), each sends corresponding 12 of frequency and receives frequency, determines in case send frequency, and just no longer change can realize frequency hopping by certain rule but receive frequency between 12 frequencies.The micropower base station adopts 6 to send frequencies and can guarantee, on any space, different frequencies can be used in adjacent micropower base station, avoids co-channel interference.
In the present embodiment, the base station can but be not limited to the micropower base station.
Step 102: the packet that receives this mobile tag feedback.
In the present embodiment, mobile tag can enter silent status before movement, do not send any radiofrequency signal, the motion that only ought detect self just starts carrier detect, only detecting the micropower base station when existing, just can send radiofrequency signal to the micropower base station.Concrete steps are:
During the label power-up initializing, in case the motion of mobile tag detected, just begin to detect respectively Fi (i=1,2,3,4,5,6), detecting is spaced apart 1 second, and the detecting duration is 1 millisecond.When mobile tag was detected less than any frequency, the expression mobile tag was not in base station range, and label just enters dormancy again, waits for the label timing wake-up, and whether tags detected moves again.
This mobile tag enters silent status and can avoid mobile tag to continue to send radiofrequency signal or lasting received RF signal, avoids battery to exhaust too early, improves the working life of mobile tag.
Mobile tag is after receiving this carrier wave, can feed back a packet to the base station, this packet inclusion information has: transmitted power, the received signal strength when this mobile tag receives this carrier wave that the identify label of this mobile tag, this mobile tag use when sending described packet.
In the present embodiment, comprise the frequency hopping rule that this base station allows the some Fij of the reception frequency that uses in this carrier wave.Mobile tag can guarantee that by hopping a plurality of labels do not disturb when mutual with the micropower base station, also increase fail safe, effectively prevents eavesdropping and distorts label information.
Step 103: the received signal strength of base station during according to this mobile tag reception carrier of comprising in the transmitted power of this carrier wave and packet, the first radio-frequency propagation loss between calculation base station and mobile tag.
In the present embodiment, the propagation loss formula due to wireless signal under free space is: Los=32.44+20lg(d)+20lg(f), wherein, Pout – Pin=Los, so Pout-Pin=32.44+20lg (d)+20lg (f).In formula, letter represents that implication is:
D---propagation distance unit kilometer
F---wireless signal cps Mhz
The dB of Los---propagation loss unit
The dBm of Pout---transmitted power unit
The dBm of Pin---received signal strength unit
In the present embodiment, the received signal strength of base station during according to this mobile tag reception carrier of comprising in the transmitted power of this formula and carrier wave and packet calculates the first radio-frequency propagation loss between described base station and described mobile tag.
Step 104: the propagation loss mapping table corresponding to transmitted power of this carrier wave inquired about according to this first radio-frequency propagation loss in the base station.
In the present embodiment, this propagation loss mapping table is: the mapping relations table between effective coverage distance of the propagation loss of base station and mobile tag and described carrier wave.
As the present embodiment for example, following form is a kind of form wherein:
Table one: the base station sends radio-frequency power-20dBm, and maximum effective coverage range is 5 meters of radiuses.
| The propagation loss Δ dBm of P unit | Coverage radius r unit rice |
| ΔP11 | 1 |
| ΔP12 | 2 |
| ΔP13 | 3 |
| ΔP14 | 4 |
| ΔP15 | 5 |
Table two: the base station sends radio-frequency power-5dBm, and maximum effective coverage range is 30 meters of radiuses.
| The propagation loss Δ dBm of P unit | Coverage radius r unit rice |
| ΔP21 | 10 |
| ΔP22 | 15 |
| ΔP23 | 20 |
| ΔP24 | 25 |
| ΔP25 | 30 |
Table three: the base station sends radio-frequency power-0dBm, and maximum effective coverage range is 80 meters of radiuses.
| The propagation loss Δ dBm of P unit | Coverage radius r unit rice |
| ΔP31 | 40 |
| ΔP32 | 50 |
| ΔP33 | 60 |
| ΔP34 | 70 |
| ΔP35 | 80 |
In the present embodiment, propagation loss mapping table corresponding to this transmitted power inquired about in the base station, confirms that this mobile tag is whether in changing the effective coverage range of base station.
Step 105: whether this first radio-frequency propagation loss higher than the propagation loss upper limit of this propagation loss mapping table or lower than the propagation loss lower limit of this propagation loss mapping table, execution in step 106, otherwise, execution in step 107.
In the present embodiment, if this first radio-frequency propagation loss illustrates namely that higher than the propagation loss upper limit of this propagation loss mapping table or lower than the propagation loss lower limit of this propagation loss mapping table this propagation loss is not in the scope of application of this mapping table.In the present embodiment, the base station begins to give tacit consent to a maximum transmit power and sends carrier wave, therefore work as propagation loss higher than prescribing a time limit in the propagation loss of this propagation loss mapping table, two kinds of contingent situations is arranged.The one, mobile tag has exceeded the maximum effective coverage range of base station, and the 2nd, mobile tag does not exceed the effective coverage range of base station, but the environment space between base station and mobile tag has stopped the propagation of carrier wave, causes propagation loss too high.
If this first radio-frequency 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 can find out from formula, propagation loss is not to increase and linear growth with distance, if the distance with this first radio-frequency propagation loss calculation base station and mobile tag, have larger error, accuracy is not high.
Step 106: the base station reduces the transmitted power of described carrier wave, returns to step 101.
In the present embodiment, the base station is according to each transmitted power in the propagation loss mapping table, reduce successively from big to small transmitted power, until within the propagation loss upper limit and lower limit of the first radio-frequency propagation loss that draws in propagation loss mapping table corresponding to this transmitted power.Otherwise, reduce transmitted power, repeat to the mobile tag transmitted power, return to step 101.
Step 107: the transmitted power the when base station sends described packet according to this mobile tag, the received signal strength when receiving this packet with the base station, the second radio-frequency propagation loss of calculation base station and mobile tag.
In the present embodiment, if the first radio-frequency propagation loss is lower than the propagation loss upper limit of described propagation loss mapping table and higher than the propagation loss lower limit of described propagation loss mapping table, transmitted power when the base station sends described packet according to this mobile tag, the received signal strength when receiving this packet with the base station, the second radio-frequency propagation loss of calculation base station and mobile tag.
Step 108: according to the value of the second radio-frequency propagation loss and the data in the propagation loss mapping table, adopt the linear difference method, calculate the distance between base station and mobile tag, to determine the position of mobile tag.
In the present embodiment, due to this first radio-frequency propagation loss in this propagation loss mapping table, this radio-frequency propagation loss meets the linear functional relation of this propagation loss mapping table, estimate and gather two values and this two mapping value that value is corresponding that approach the most with this second radio-frequency propagation loss in form, adopt the linear difference method, can calculate the distance between base station and mobile tag, to determine the position of described mobile tag.
Give an example as a kind of of the present embodiment, in the present embodiment, the base station can but be not limited to send localization message to navigation system, wherein, this localization message comprises: distance and temporal information between the identify label of base station, the identify label of mobile tag, base station and mobile tag.This temporal information can but be not limited to positioning time of this mobile tag.Navigation system is according at least three these localization messages that have the identify label of same mobile tag and have the identify label of different base station, and differed this positioning time within four seconds, calculate this mobile tag of acquisition current with respect to the plane coordinates between at least three base stations, further determine the position of mobile tag.
Therefore, than the fixing transmitted power of available technology adopting, determine distance according to the radio-frequency propagation loss between base station and mobile tag, due to radio-frequency propagation loss and propagation distance and non-linear relation, that determines is not high apart from accuracy, has larger error.And the employing technical solution of the present invention, the base station sends carrier wave to mobile tag, according to the packet of mobile tag feedback, calculates the first radio-frequency propagation loss, and inquiry propagation loss mapping table, determine that this mobile tag is whether in the effective coverage range under this transmitted power.If not, according to the transmitted power that reduces 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.The received signal strength when transmitted power when then this mobile tag of comprising according to this packet of base station sends this packet and this base station receive this packet, the second radio-frequency propagation loss of calculating described base station and described mobile tag.The linear difference method is adopted according to the value of described the second radio-frequency propagation loss and the data in described propagation loss mapping table in the base station, calculates the distance of described base station and described mobile tag, to determine the position of described mobile tag.
Although radio-frequency propagation loss and propagation distance and non-linear relation,, in the propagation distance of certain limit, it is linear that radio-frequency propagation loss and propagation distance can be approximately.Because equaling transmitted power, propagation loss deducts received signal strength, technical solution of the present invention is according to the radio frequency loss of feedback, regulate the radio frequency transmitted power of carrier wave, thereby regulate the relation between radio-frequency propagation loss and propagation distance, different distances adopt different transmitted powers, both functional relations are converted into the Decentralized Linear relation by non-linear relation, make in different intervals, radio-frequency propagation loss and propagation distance are all linear, adopt again the distance of linear difference method calculation base station and mobile tag, can improve the accuracy of location, reduce error.
Further, the base station sends to navigation system with self identify label, mobile tag sign, temporal information and range information between the two, navigation system is by the range information of at least three base stations about same mobile tag sign, determine the plane coordinates between this mobile tag current and these at least three base stations, further improve the accuracy of location.
Embodiment 2
Referring to Fig. 2, the invention provides a kind of base station, this base station can but be not limited to the 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 is used for sending carrier wave to mobile tag, and receives the packet of this mobile tag feedback.Wherein, this packet inclusion information: the received signal strength the when transmitted power that the identify label of mobile tag, mobile tag use when sending this packet, mobile tag receive this carrier wave.
Calculator 202 is electrically connected to radio-frequency (RF) transceiver 201, the received signal strength when being used for mobile tag that transmitted power and this packet according to this carrier wave comprise and receiving this carrier wave, the first radio-frequency propagation loss between calculation base station and mobile tag.
Calculator 202 also is used at inquiry determiner 203 inquiry propagation loss mapping tables, determine that the first radio-frequency propagation loss is lower than the propagation loss upper limit of this propagation loss mapping table and higher than prescribing a time limit under the propagation loss of this propagation loss mapping table, transmitted power when sending this packet according to mobile tag, the received signal strength when receiving this packet with the base station, the second radio-frequency 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 effective coverage distance of described carrier wave between the mapping relations table.
Calculator 202 also is used for according to the value of the second radio-frequency propagation loss and the data of propagation loss mapping table, adopts the 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 to respectively with radio-frequency (RF) transceiver 101, calculator 202, be used for according to the first radio-frequency propagation loss, inquire about the propagation loss mapping table corresponding to transmitted power of this carrier wave, determine that the first radio-frequency propagation loss is whether in described loss mapping table within the propagation loss upper limit and lower limit.
Radio-frequency (RF) transceiver 201 also is used for: prescribe a time limit higher than the propagation loss upper limit of this propagation loss mapping table or under lower than the propagation loss of this propagation loss mapping table in definite the first radio-frequency propagation loss of 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 but be not limited to referring to the corresponding record in embodiment 1.
Give an example as a kind of of the present embodiment, radio-frequency (RF) transceiver 201 also is used for: send localization message to navigation system, wherein, localization message comprises: distance and temporal information between the identify label of base station, the identify label of mobile tag, described base station and described mobile tag.Wherein, this temporal information can but be not limited to positioning time of this mobile tag.Navigation system is according at least three these localization messages that have the identify label of identical this mobile tag and have the different base station identify label, and should positioning time within 4 seconds, calculate that to obtain to change mobile tag current with respect to the plane coordinates between these at least three base stations.
Therefore, than the fixing transmitted power of available technology adopting, determine distance according to the radio-frequency propagation loss between base station and mobile tag, due to radio-frequency propagation loss and propagation distance and non-linear relation, that determines is not high apart from accuracy, has larger error.And the employing technical solution of the present invention, the radio-frequency (RF) transceiver 201 of base station sends carrier wave to mobile tag, packet according to the mobile tag feedback, calculator 202 calculates the first radio-frequency propagation loss, by inquiry determiner 203 inquiry propagation loss mapping tables, determine that this mobile tag is whether in the effective coverage range under this transmitted power.If not, radio-frequency (RF) transceiver 201 according to the transmitted power that reduces carrier wave, sends carrier wave again, and again receives the packet of feedback, until determine in the effective coverage range of this mobile tag under this transmitted power.The received signal strength when transmitted power when then this mobile tag of comprising according to this packet of calculator 202 sends this packet and this base station receive this packet, the second radio-frequency propagation loss between calculation base station and mobile tag.At last, calculator 202 adopts the linear difference method according to the value of the second radio-frequency propagation loss and the data in the propagation loss mapping table, calculates the distance of base station and mobile tag, to determine the position of mobile tag.
Although radio-frequency propagation loss and propagation distance and non-linear relation,, in the propagation distance of certain limit, it is linear that radio-frequency propagation loss and propagation distance can be approximately.Because equaling transmitted power, propagation loss deducts received signal strength, technical solution of the present invention is according to the radio frequency loss of feedback, regulate the radio frequency transmitted power of carrier wave, thereby regulate the relation between radio-frequency propagation loss and propagation distance, different distances adopt different transmitted powers, both functional relations are converted into the Decentralized Linear relation by non-linear relation, make in different intervals, radio-frequency propagation loss and propagation distance are all linear, adopt again the distance of linear difference method calculation base station and mobile tag, can improve the accuracy of location, reduce error.
Further, the radio-frequency (RF) transceiver 201 of base station sends to navigation system with self identify label, mobile tag sign and between the two distance and temporal information.Navigation system is by at least three base stations range information about same mobile tag sign, and positioning time in 4 seconds, this mobile tag of calculative determination is current with respect to the plane coordinates between at least three base stations, further improves the accuracy of location.
Device embodiment described above is only schematic, wherein said unit as the separating component explanation can or can not be also physically to separate, the parts that show as the unit can be or can not be also physical locations, namely can be positioned at a place, perhaps also can be distributed on a plurality of network element.Can select according to the actual needs wherein some or all of module to realize the purpose of the present embodiment scheme.Those of ordinary skills namely can understand and implement in the situation that do not pay performing creative labour.
Through the above description of the embodiments, those skilled in the art can be well understood to each execution mode and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware.Based on such understanding, the part that technique scheme contributes to prior art in essence in other words can embody with the form of software product, this computer software product can be stored in computer-readable recording medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be personal computer, server, perhaps network equipment etc.) carry out the described method of some part of each embodiment or embodiment.
Above-described execution mode does not consist of the restriction to this technical scheme protection range.Any at above-mentioned execution mode spirit and principle within do modification, be equal to and replace and improvement etc., within all should being included in the protection range of this technical scheme.
Claims (4)
1. the localization method based on feedback radio frequency loss estimated distance, is characterized in that, comprising:
The base station sends carrier wave to mobile tag, and receives the packet of described mobile tag feedback;
Wherein, described packet inclusion information: the transmitted power that the identify label of described mobile tag, described mobile tag use when sending described packet, the 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 that comprises in the transmitted power of described carrier wave and described packet calculates the first radio-frequency propagation loss between described base station and described mobile tag;
Described base station is according to described the first radio-frequency propagation loss, inquire about the propagation loss mapping table corresponding to transmitted power of described carrier wave, described propagation loss mapping table is: the propagation loss between described base station and described mobile tag, and effective coverage distance of described carrier wave between the mapping relations table;
If described the first radio-frequency propagation loss is higher than the propagation loss upper limit of described propagation loss mapping table or lower than the propagation loss lower limit of described propagation loss mapping table,
Described base station reduces the transmitted power of described carrier wave, again sends described carrier wave to described mobile tag, returns to step: the packet that receives described mobile tag feedback;
If described the first radio-frequency propagation loss is lower than the propagation loss upper limit of described propagation loss mapping table and higher than the propagation loss lower limit of described propagation loss mapping table,
Transmitted power when the base station sends described packet according to described mobile tag, the received signal strength when receiving described packet with described base station calculate the second radio-frequency propagation loss between described base station and described mobile tag;
According to the value of described the second radio-frequency propagation loss and the data in described propagation loss mapping table, adopt the 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 that calculates described base station and described mobile tag, after the position of determining described mobile tag, also comprise:
Described base station sends localization message to navigation system, and wherein, described localization message comprises: distance and temporal information between the identify label of described base station, the identify label of described mobile tag, described base station and described mobile tag,
According at least three described localization messages that have the identify label of identical described mobile tag and have the identify label of different described base stations, calculate the described mobile tag of acquisition current with respect to the plane coordinates between at least three described base stations for described navigation system.
3. a base station, is characterized in that, comprising:
Radio-frequency (RF) transceiver is used for sending carrier wave to mobile tag, and receives the packet of described mobile tag feedback;
Wherein, described packet inclusion information: the transmitted power that the identify label of described mobile tag, described mobile tag use when sending described packet, the received signal strength when described mobile tag receives described carrier wave;
Calculator, the received signal strength when being used for described mobile tag that transmitted power and described packet according to described carrier wave comprise and receiving described carrier wave calculates the first radio-frequency propagation loss between described base station and described mobile tag,
And be used at inquiry determiner inquiry propagation loss mapping table, determine that described the first radio-frequency propagation loss is lower than the propagation loss upper limit of described propagation loss mapping table and higher than prescribing a time limit under the propagation loss of described propagation loss mapping table, transmitted power when sending described packet according to described mobile tag, the received signal strength when receiving described packet with described base station, calculate the second radio-frequency propagation loss between described base station and described mobile tag
And be used for according to the value of described the second radio-frequency propagation loss and the data of described propagation loss mapping table, adopt the 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 effective coverage distance of described carrier wave between the mapping relations table;
Described inquiry determiner is used for according to described the first radio-frequency propagation loss, and the propagation loss mapping table corresponding to transmitted power of the described carrier wave of inquiry determines that described the first radio-frequency propagation loss is whether in described loss mapping table within the propagation loss upper limit and lower limit;
Described radio-frequency (RF) transceiver also is used for: determine described the first radio-frequency propagation loss higher than the propagation loss upper limit of described propagation loss mapping table or prescribe a time limit under lower than the propagation loss of described propagation loss mapping table at described inquiry determiner, reduce the transmitted power of described carrier wave, again send described carrier wave to described mobile tag.
4. base station according to claim 3, is characterized in that,
Described radio-frequency (RF) transceiver also is used for: send localization message to navigation system, wherein, described localization message comprises: distance and temporal information between the identify label of described base station, the identify label of described mobile tag, described base station and described mobile tag,
According at least three described localization messages that have the identify label of identical described mobile tag and have the identify label of different described base stations, calculate the described mobile tag of acquisition current with respect to the plane coordinates between at least three described base stations for described navigation system.
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