CN101644777A - Improved room separation in RTLS based on WLAN and method thereof - Google Patents
Improved room separation in RTLS based on WLAN and method thereof Download PDFInfo
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Abstract
The invention relates to an improved room separation in an RTLS based on a WLAN and a method thereof. A wireless location system tracks and locates wireless tags in a structure with a plurality of restricted regions, and divides the plurality of restricted regions. The wireless location system is provided with at least one ultrasonic transmitter positioned in each restricted region; and the ultrasonic transmitter is used for transmitting ultrasonic signals with region identification information and/or transmitter ID information. The wireless location system is provided with a plurality of wireless tags, wherein each wireless tag transmits the newest region identification information and/or transmitter ID information received and accepted by the wireless tag in the form of a tag message. Aplurality of position receivers are arranged in the structure for receiving the tag message and reporting the message received by the tag and selectable measurement parameters to a public server. Thepublic server uses transmitter ID reported by the restricted regions or the wireless tags to determine the position of each wireless tag in the structure.
Description
Technical field
Present invention relates in general to wireless lan (wlan), more particularly, relate to the WLAN positioning system that the real time position and the definite room that these article are positioned at of article at the appointed time are provided with high reliability and precision.
Background technology
In many places of real-time positioning system are installed, importantly, not only at the appointed time know the real time position of article to high reliability, and know the definite room number that these article are positioned at.In being divided into the floor area such as the edifice of hospital architecture thing of many cubicles, especially need this real-time positioning system.
Typically the real-time positioning system (RTLS) based on WLAN utilizes radio wave signal, so that the computing equipment position.This typically carries out the RSSI (indication of remote signal intensity) of the radio signal of label transmission is measured or TOA (arrival time) measurement.Several position receiver or access point that this signal is in the diverse location receive, and carry out particular geometric and mathematical algorithm, with the position of computing equipment.The more detailed description of these system and methods can find in above-mentioned patented claim.
Even this system can reach high position precision (less than 1m-2m) now, this system also have provide know definite room location/number the problem of best solution.This feature is called as " room partitioning ".Therefore, the article that are arranged in a room can be presented on the opposite side of wall mistakenly, that is, and and in adjacent room.This because radio signal can pass wall and system sometimes to the existence of wall not the fact of " sensitivity " take place.
Main challenge at room partitioning is as follows: (1) provides almost 100% room partitioning, tell the definite room location of consumer articles with the low-down probability that article are positioned in the wrong room, (2) keep station-keeping ability and based on other advantage of the real-time positioning system of WLAN, as location, open air, remote measurement etc., and (3) realize above-mentioned purpose with single room fringe cost of minimum.
Typical solutions at " room partitioning " problem is to use the low frequency wireless communication: low frequency transmitter (being sometimes referred to as driver) regularly sends the beacon signal that comprises room number information.Label is sent by this low frequency and triggers, and wakes the concurrent WLAN message that is sent to this System Reports driver ID and/or room number up.This driver is positioned at the porch in room, so that it triggers each label that enters this room.In other cases, this driver is positioned on the wall of house interior, and be tuned to make its radiation will be in this room and only almost each position in this room receive.The more detailed description of these system and methods can find in above-mentioned patented claim.
Said system has solved and has required #2 fully and WLAN RTLS when integrated.Yet, its #3 that do not meet the demands fully---be difficult to obtain the solution of relatively low single room cost because of the cost of driver.And it is not that 100% room partitioning (requiring #1) is provided all the time because: (a) extremely difficult sometimes be tuned to driver in the room and only the point of each in this room place receive; (b) be difficult to differentiation and enter the room time and withdraw from the room incident, this complicates the total system solution.
Utilize ultrasound wave to provide the another kind of mode of room partitioning, because ultrasound wave arbitrarily expansion in the region of no pressure, but do not pass wall.Utilize hyperacoustic existing real-time positioning system to comprise: the transmitter in the label and be connected in the network and be attached to the wall of house interior or one or more ultrasonic receiver of ceiling.The constant transmission ultrasonic signal of this label, and receiver is to network-reporting signal level and/or label ID that the residing room of the label that sends is identified.Because the ultrasonic signal that sends by label is only received by those receivers that are in the same room with it, so quite easily determine definite room.Can also determine the definite position in the room, but more difficult.
This system has solved and has required #1, and a kind of good method that is used to obtain almost ideal room partitioning is provided.Yet this ultrasonic system is the separate payment that needs its oneself unique foundation structure, thus, and its #2 that do not meet the demands, and do not comprise that the user is from the standard WLAN foundation structure of using him at positioning system and whole benefits of obtaining.Its #3 that also do not meet the demands, because it, also needs unique foundation structure except needs WLAN foundation structure, this has increased the total cost of solution.In each room, need there be a plurality of receivers, thus, the total cost in each room is also higher relatively.
Therefore, the system and method that need be provided for addressing the above problem.This system and method is considered and is utilized ultrasonic signal and carry out room partitioning based on location and the service of WLAN.Two kinds of technical combinations and the system structure mode that integrates are made it possible to satisfy above-mentioned whole requirements at room partitioning in very effective mode.
Summary of the invention
According to an embodiment of the invention, a kind of wireless location system is disclosed.This wireless location system is used for following the tracks of and locating the wireless identification tag of the structure with a plurality of localized areas, and described a plurality of localized areas are distinguished.This wireless location system has at least one ultrasonic transmitters that is arranged in each localized area, and this ultrasonic transmitters is used to send the ultrasonic signal with area identification information and/or transmitter id information.Be provided with a plurality of wireless identification tags, wherein, each wireless identification tag all sends up-to-date area identification information or the up-to-date transmitter ID that this wireless identification tag receives and accepts with tag message.A plurality of positions receiver and/or WLAN access point are installed, the message and the optional measurement parameter that are used to receive described tag message and are used for receiving from described label to the public server report in described structure.Described server also utilizes the transmitter ID of described localized area or the report of each wireless identification tag to determine the position of each wireless identification tag in the described structure.
According to another embodiment of the present invention, a kind of a plurality of wireless identification tags of a plurality of localized areas that are used for following the tracks of and locate a structure and the method that described a plurality of localized areas are distinguished are disclosed.This method may further comprise the steps: the position receiver and/or the WLAN access point that are installed in the described structure are set, with the location wireless identification tag; At least one ultrasonic transmitters is installed in each independent localized area; Send ultrasonic signal by each ultrasonic transmitters in described at least one ultrasonic transmitters in each independent localized area, each ultrasonic signal all is limited to the independent localized area that sends, and described ultrasonic signal has area identification information and/or transmitter ID; Receive described ultrasonic signal with described area identification information and/or transmitter ID by the wireless identification tag in the coverage of described at least one ultrasonic transmitters in described independent localized area; And by the described wireless identification tag transmission tag message in the coverage, described tag message comprises up-to-date identification information (area identification and/or transmitter ID) and the wireless identification tag identification data that described wireless identification tag receives and accepts.
According to another embodiment of the present invention, a kind of wireless identification tag is disclosed.This wireless identification tag has the ultrasonic receiver module, and this ultrasonic receiver module is used to receive the ultrasonic signal with area identification information and/or transmitter id information.Be provided with transmitter, this transmitter is used to send the area identification information that described wireless identification tag receives and accept and/or the identification number of transmitter id information and described wireless identification tag.Be provided with storer, this storer is used for storing at least described identification number (zone and/or transmitter ID).One microprocessor is coupled to described storer, described ultrasonic receiver module and described transmitter.Be provided with power supply, this power supply is used for providing electric power to the circuit of described wireless identification tag.
When read in conjunction with the accompanying drawings, by the reference following detailed, will understand the present invention best.
Description of drawings
Fig. 1 is the figure with system of the present invention;
Fig. 2 is the simplified block diagram that the system of Fig. 1 is shown;
Fig. 3 is the simplified block diagram of the wireless identification tag that uses among the present invention; And
Fig. 4 is the simplified block diagram of the ultrasonic transmitters used among the present invention.
Running through institute's drawings attached all uses common label to indicate identical key element with describing in detail.
Embodiment
With reference to accompanying drawing, an embodiment of wireless network 100 of the present invention is disclosed.Network 100 is at the appointed time to provide the real time position of article and the wireless location system in the definite room that these article are positioned at high reliability and precision.
Network 100 uses standard radio label 102.In Fig. 1, show six different labels 102.Yet this only is illustrated as an example, and should not cause restriction to scope of the present invention.According to an embodiment, label 102 is based on the label of WLAN.Yet the present invention can realize with label 102 and any standard wireless client end of working in this network.For simplicity, any the quoting to label 102 also is applicable to WLAN mobile unit or wlan standard client in this application, and vice versa.
Distinguish problem in order to solve the room, each label 102 all is integrated with ultrasonic receiver module 106 (referring to Fig. 3).In case the ultrasonic signal that comprises room and/or transmitter ID number that is sent by ultrasonic signal (US) transmitter 108 triggers, label 102 just comprises room and/or transmitter ID and the WLAN radio message (RM) that specific label 102 is associated with particular room to network 100 transmissions.
According to an embodiment of the invention, one or more is positioned at the room based on ultrasonic transmitter 108, and regularly send and comprise that room ID (that is, regional # 1, regional # 2 etc.) or any other identification information (for example, transmitter ID) are at interior ultrasonic signal (US).Because the not through characteristic of ultrasonic signal (US), thereby the ultrasonic signal (US) that label 102 only is positioned at the transmitter 108 in these label residing rooms 102 triggers.This ultrasonic signal (US) can not penetrate room wall, does not trigger the label 102 that is positioned at outside this room thus.Because the propagation characteristic of ultrasonic signal in enclosing region, thereby they will be received by the label 102 of any position or angle in the room.It should be noted that, in Fig. 1, use door in the inlet/outlet location in room usually, trigger the label 102 of the opposite side in the inlet/outlet zone that is positioned at the room to prevent ultrasonic signal (US).Thereby the label # 2 in the zone 2 of Fig. 1 does not receive the ultrasonic signal (US) that the transmitter 108 among the regional # 1 sends.
A key benefits of network 100 is that network 100 utilizes the trunk WLAN of label 102 to connect, so that send room and/or transmitter ID and label ID.Thereby network 100 connects or ultrasound unit new network infrastructure in addition without any need for complementary network.
In another embodiment of network 100, can increase bearing accuracy, but not only provide article to be arranged in the information in which room based on wlan system 104.The transmission ID restricted articles that transmitter 108 sends are with respect to the position coordinates of localized area (that is, limiting room area), thus, send the position calculation result that ID can eliminate the coordinate outside the qualification room area that obtains to be in this transmissions ID.In another embodiment, because room information is the subclass of floor information, thereby, can use this additional information to avoid detecting article (floor separation) in the wrong floor.In another embodiment of this method, can use room and/or transmitter id information to filter the reading of some WLAN position receivers 110.Can eliminate this route (way) mistake factor (as interference), thereby the integral position coordinate that wlan system 104 calculates will be more accurate to the ad-hoc location receiver.
Below, with reference to Fig. 3, and according to an embodiment, label 102 comprises one or more ultrasonic microphone 112.Ultrasonic microphone 112 is connected to the ultrasonic receiver module 106 that can obtain data according to the ultrasonic signal that receives (US).Transmission ID from ultrasonic signal (US) is sent to microprocessor 120.Aerial regular ultrasonic signal (US) triggers transmitter 114, and this transmitter 114 sends relevant information (for example, room ID and/or transmitter ID) by the positioning system 104 based on WLAN.Alternatively, this information stores can be sent in the storer 116 of label 102 and in the next session that the WLAN of this label 102 sends.WLAN sends signal and typically regularly sends by predetermined space, and comprises broadcast address, sequence number and the out of Memory that comprise label ID and telemetry intelligence (TELINT) relevant with label.Transmission signal as minimum comprises that from storer 116 identification numbers that are associated with label 102 that obtain this storer 116 can also storage microprocessor 120 instruction and datas.
Can comprise detector (sniffer) circuit 132, to determine whether the WLAN channel is unimpeded.If the WLAN channel is unimpeded, then send this transmission signal on schedule, otherwise, use rollback (back-off) algorithm of the specific WLAN standard defined that adopts by WLAN, and when this channel is unimpeded, send this signal subsequently.Alternatively, can omit detector circuit 132, in this case, utilize non-standard sign indicating number sequence or non-standard lead code to distinguish this transmission signal and standard WLAN signal.
In another embodiment of the present invention, the low frequency receiver of above-mentioned driver solution (as be used for) works under the same frequency range (40Khz-200Khz) usually because the low frequency receiver 134 that has existed, so for the purpose that receives ultrasonic signal (US), label 102 can utilize this low frequency receiver 134.The low-frequency antenna 134A of ultrasonic microphone 112 and low frequency receiver 134 can be connected in parallel, and as two antennas of low frequency receiver 134, and label 102 can comprise this two options.
According to another embodiment of the present invention, label 102 can be by the low frequency radio signal triggering synchronous with the ultrasonic signal (US) of sender side.In this embodiment, because ultrasound wave is with respect to the low propagation speed of radiowave, thereby can use synchronously, come to come distance between computation tag 102 and the transmitter 108 by the time delay between measurement radio signal and the ultrasonic signal (US).This information can send by the positioning system 104 based on WLAN, and is used for the various location purpose such as the location of the improvement in the room.Under any circumstance, because label 102 is to the highstrung device of power, thereby, in label, have ultrasonic receiver and do not have ultrasonic transmitters, make it possible to realize low-power consumption, this provides long battery life.
In the specific implementations of this system, label 102 can have receiver window, and in this receiver window, low frequency receiver 134 regularly is activated, and detects the existence of ultrasonic signal.Low frequency receiver 134 can activate from idle (battery saving mode) or from complete off-position.Can use this feature,, thereby increase its battery life so that reduce the overall power of label 102.The importance of this feature is, because the propagation slowly of ultrasonic signal, so the reception of message is a power consumption tasks for label 102.
In another embodiment of the present invention, low frequency stimulator can be positioned at the inlet/outlet place in zone, and can use this low frequency stimulator to come when label 102 enters/withdraw from this zone, to activate/to stop using ultrasonic receiver 106 in this label 102 (consistently or activate/stop using regularly receive at interval) with many rooms.Use this low frequency stimulator,, make time period when label is not arranged in the section of the ultrasonic region separation of needs in this place the ultrasonic receiver 106 of stopping using fully so that increase the battery life of label.In another embodiment, driver can be used to revise the ultrasonic reception interval of label, but not only activate/stop using this ultrasonic receiver.
In another embodiment of the present invention, label 102 can have the wireless network receiver (two-way label) of itself.Know in the system of the position of label in (as location) otherwise based on RF, this system sends order by its RF receiver to label 102, activates/stop using ultrasonic receiver 106 (or regularly receiver window) when needing ultrasonic region separation regional to enter/to withdraw from label 102.
Below, with reference to Fig. 4, ultrasonic transmitters 108 comprises the ultrasonic transducer 108A that is used for regularly sending ultrasonic signal.Microprocessor 108C can be used to determine when transmission ultrasonic signal (US).Ultrasonic signal (US) comprises room ID or any other identification information (for example, transmitter ID) in its payload user data.In a preferred embodiment, ultrasonic transmitters 108 will comprise power supply 108D.Power supply can be to make transmitter 108 can install on the wall and obtain the electric connector of the electric power of transmitter operation.Alternatively, power supply 108D can perhaps be connected directly to the electrical network as pendent lamp according to battery-operated.Alternatively, several transmitters 108 can be installed in the same room, these transmitters 108 all send identical data, to guarantee the coverage at very large enclosing region.
Any other interface of room ID (or any other correlation ID) artificial (for example, utilizing DIP switch 108E) or utilization such as the device 108F that is connected in series etc. can be provided with and give transmitter 108.
In another embodiment of the present invention, transmitter 108 can be connected to the positioning system 104 based on WLAN for (as room ID or output power) network configuration purpose, perhaps be connected to cable network (for example, Ethernet) at the power supply that utilizes PoE (POE) switch.More dirigibilities when network configuration (wired or wireless) will provide installation and maintenance for the user.When using WLAN to connect, can be by integrated optional wireless transceiver 108G in ultrasonic transmitters unit 108, OTA (airborne spread) configuration and control are provided thus, the microprocessor 108C in this ultrasonic transmitters unit 108 is connected to positioning system 104 based on WLAN.
According to another embodiment of transmitter 108, transmitter 108 comprises such as above-mentioned driver and integrated portion low frequency transmitter 108B, to form the ultrasonic action device.This makes it possible to ultrasonic beacon and low-frequency radio beacon synchronous, thus for thereby preference former because of power consumption with the label that the low frequency radio triggers, make it possible to trigger label with the low frequency radio.
In this embodiment, the ultrasonic action device can comprise more than one loudspeaker.In an exemplary embodiment, in the front of box a loudspeaker should be arranged, and nearly four loudspeakers should be arranged in each side, these loudspeakers all simultaneously or in a sequence send.Each loudspeaker can be activated or stop using.The amplitude of each loudspeaker and phase place can also Be Controlled and be arranged in zero and maximum available output between any level.This feature can be used for being increased in the diverse location in room and the ultrasonic action device is installed, be optimized it to the covering of whole room space and reduce its dirigibility by the leakage of the opening (as door and window) in the room.
In various embodiments of the present invention, the transmission frequency of ultrasonic action device can change between the 200KHz at 20KHz, because the high more propagation loss of frequency is just high more, thereby, high frequency can be used for more accurate localization precision.In other embodiments, can use different frequency to avoid interference (as, the interference that causes because of other contiguous US source) to the receiver in the label 102.Avoid interference and to finish by the dynamic or static frequency that changes.
In a specific implementations of the present invention, a plurality of ultrasonic action devices (or mixing LF+ ultrasonic action device) daisy chain can be linked together.This daisy chain connects and can be used for providing the ultrasonic signal of bigger or optimization to cover by making all drivers send (with the space phase simple crosscorrelation between them) simultaneously at particular space.Each ultrasonic action device in another embodiment, can make these ultrasonic action devices synchronous, so that can send at interval by different time.This can be used for being avoided the aerial interference between the transmission of several ultrasonic action devices in same room, and creates more high-resolution region separation in same room.
In an exemplary embodiment of the present invention, monitoring ultrasonic action device state.This monitoring can be finished with detection of transmitted signals by self-test mechanism or by the ultrasonic receiver (ultrasonic receiver that uses in as label) that itself is embedded in the reduction scope at this driver.Monitoring indication can be finished (for example, by connecting LED) in driver this locality, and perhaps the network by this driver connects and finishes.
In a preferred embodiment of the present invention, the US driver can be designed to comprise the box of built-in AC electric power outlet on its back, so that can it be installed and to its power supply in the socket by simply it being inserted into.This provides the combination of simple installation and power supply solution.
The present invention can also realize in based on wireless wlan network any.A preferred implementation is a standard Wi-Fi network, but any other WLAN infrastructure radio structure, no matter be standard or special-purpose, may be used to realize the present invention.
The present invention satisfies whole 3 requirements at " room partitioning ".In the present invention, by being incorporated into, ultrasonic signal obtained to be in close proximity to 100% room partitioning in the system.This system has kept whole advantages of WLAN positioning system thus based on the WLAN real-time positioning system, comprise use existing foundation structure, bearing accuracy, based on the service of WLAN and use remote measurement.The total cost in each room is less because of the required accessory assembly therefor amount of label, the ultrasonic transmitters unit cost is lower and simple and utilized existing network foundation structure lower.But the present invention's simple realization and effective.The present invention provides above-mentioned advantage in realization, that is, and and with minimum fringe cost to existing assembly, and to the minimum influence in life-span of tag battery, and be combined to naturally in the WLAN positioning system.
The disclosure provides demonstration embodiment of the present invention.Scope of the present invention is not limited by these demonstration embodiments.According to the disclosure, those skilled in the art can realize a plurality of modified examples, no matter are that this instructions is clearly stipulated or by this instructions hint, as the modified example of structure, yardstick, material type and manufacturing process aspect.
Related application
The denomination of invention that the application relates to announcement on November 22nd, 2005 is that the United States Patent (USP) 6963289 of " WIRELESS LOCAL AREA NETWORK (WLAN) CHANNELRADIO-FREQUENCY IDENTIFICATION (RFID) TAG SYSTEM ANDMETHOD THEREFOR " and the denomination of invention of submission on August 8th, 2006 are " ENHANCED AREA SEPARATION IN WIRELESSLOCATION SYSTEMS SYSTEM AND METHOD " and the U.S. Patent application with sequence number 11/466540 for the denomination of invention of announcing in the United States Patent (USP) 6968194 of " METHOD ANDSYSTEM FOR LOCATION FINDING IN A WIRELESS LOCAL AREANETWORK ", on November 8th, 2005. These all are transferred to same assignee, and are incorporated into this by reference.
Claims (26)
1, a kind of wireless location system, this wireless location system are used for following the tracks of and locating the wireless identification tag of the structure with a plurality of localized areas and described a plurality of localized areas are distinguished, and described wireless location system comprises:
Be arranged at least one ultrasonic transmitters of each localized area of described a plurality of localized areas, described ultrasonic transmitters is used to send ultrasonic signal, and this ultrasonic signal has at least one data that comprise among area identification information or the transmitter ID;
A plurality of wireless identification tags, wherein, each wireless identification tag all sends with tag message and comprises up-to-date area identification information that this wireless identification tag receives and accepts or at least one the data among the transmitter ID;
Be installed in a plurality of positions receiver in the described structure, described position receiver is used to receive described tag message and be used to report described tag message and the measurement parameter that receives; And
Server, this server is used to receive described tag message and measurement parameter, and is used for determining the position and the localized area of each wireless identification tag.
2, wireless location system according to claim 1, wherein, described a plurality of positions receiver is the WLAN access point.
3, wireless location system according to claim 1, wherein, described ultrasonic signal triggers each wireless identification tag and sends described identification information with tag message.
4, wireless location system according to claim 1, wherein, described area identification information stores and sends in the session at the next one of each label and to send in each label.
5, wireless location system according to claim 1, wherein, described at least one ultrasonic transmitters regularly sends the described ultrasonic signal with area identification information.
6, wireless location system according to claim 1, wherein, described at least one ultrasonic transmitters also sends the low frequency radio signal synchronous with described ultrasonic signal.
7, wireless location system according to claim 1, wherein, each label all comprises:
The ultrasonic receiver module, this ultrasonic receiver module is used to receive the described ultrasonic signal with area identification information; With
Transmitter, this transmitter are used to send the described area identification information that described wireless identification tag receives and accepts.
8, wireless location system according to claim 7, wherein, each label also comprises:
Storer, this storer is used for storing at least the identification number of independent label;
Microprocessor, this microprocessor are coupled to described storer, described ultrasonic receiver module and described transmitter; And
Power supply, this power supply are used for providing electric power to the circuit of each independent label.
9, wireless location system according to claim 8, wherein, each label also comprises:
Be coupled to the detector circuit of described signal processor, it is when unimpeded that this detector circuit is used to be identified for the channel that described transmitter sends; With
The power state monitor, this power state monitor is used to monitor the state of described power supply.
10, wireless location system according to claim 8, wherein, described ultrasonic receiver module comprises:
Ultrasonic microphone; With
Ultrasonic receiver, this ultrasonic receiver are coupled to described ultrasonic microphone and are coupled to described signal processor.
11, wireless location system according to claim 10, wherein, each label also comprises the low frequency receiver that is coupled to described signal processor.
12, a kind of a plurality of wireless identification tags of a plurality of localized areas that are used for following the tracks of and locate a structure and the method that described a plurality of localized areas are distinguished, this method may further comprise the steps:
Setting is installed in the described structure to locate the position receiver of wireless identification tag;
At least one ultrasonic transmitters is installed in each independent localized area;
Send ultrasonic signal by each ultrasonic transmitters in described at least one ultrasonic transmitters in each independent localized area, each ultrasonic signal all is limited to the independent localized area that sends, and described ultrasonic signal has at least one among area identification information or the transmitter ID;
Receive at least one the described ultrasonic signal have among described area identification information or the transmitter ID by the wireless identification tag in the coverage of described at least one ultrasonic transmitters in described independent localized area; And
Send tag message by the described wireless identification tag in the coverage, described tag message comprises up-to-date identification information that described wireless identification tag receives and accepts or at least one and wireless identification tag identification data among the transmitter ID.
13, method according to claim 12, wherein, described position receiver is the WLAN access point.
14, method according to claim 12, wherein, described ultrasonic signal triggers described wireless identification tag and sends described identification information with described tag message.
15, method according to claim 12, this method is further comprising the steps of:
The described area identification information of storage in described wireless identification tag; With
The next one at described wireless identification tag sends the described tag message of transmission in the session.
16, method according to claim 12, wherein, the step that sends ultrasonic signal also comprises the step of the described ultrasonic signal of regular transmission.
17, method according to claim 12, this method also comprise the step by the synchronous low frequency radio signal of described at least one ultrasonic transmitters transmission and described ultrasonic signal.
18, a kind of wireless identification tag, this wireless identification tag comprises:
The ultrasonic receiver module, this ultrasonic receiver module is used for receiving the ultrasonic signal of at least one information with area identification information or transmitter id information;
Transmitter, this transmitter are used for sending the identification number of described at least one and the described wireless identification tag of area identification information that described wireless identification tag receives and accept or transmitter id information;
Storer, this storer are used for storing at least described identification number;
Microprocessor, this microprocessor are coupled to described storer, described ultrasonic receiver module and described transmitter; And
Power supply, this power supply are used for providing electric power to the circuit of described wireless identification tag.
19, wireless identification tag according to claim 18, this wireless identification tag also comprises:
Be coupled to the detector circuit of described signal processor, it is when unimpeded that this detector circuit is used to be identified for the channel that described transmitter sends; With
The power state monitor, this power state monitor is used to monitor the state of described power supply.
20, wireless identification tag according to claim 18, wherein, described ultrasonic receiver module comprises:
Ultrasonic microphone; With
Ultrasonic receiver, this ultrasonic receiver are coupled to described ultrasonic microphone and are coupled to described signal processor.
21, wireless identification tag according to claim 20, wherein, each label also comprises the low frequency receiver that is coupled to described signal processor.
22, according to claim 1ly be used for following the tracks of and locating the wireless identification tag of structure and the wireless location system that described a plurality of localized areas are distinguished with a plurality of localized areas, wherein, each wireless identification tag can both be measured the arrival time of a plurality of ultrasonic signals that each label receives, and described server uses the described arrival time of measuring to utilize TDOA to calculate the position of each label.
23, wireless identification tag according to claim 18, wherein, described ultrasonic receiver module can be measured the arrival time of a plurality of ultrasonic signals that receive, and server uses the described arrival time of measuring to utilize TDOA to calculate the position of described label.
24, according to claim 1ly be used for following the tracks of and locating the wireless identification tag of structure and the wireless location system that described a plurality of localized areas are distinguished with a plurality of localized areas, wherein, each wireless identification tag all has each label and is activated to receive the receiver window of described ultrasonic signal.
25, wireless identification tag according to claim 18, wherein, described ultrasonic receiver module has described ultrasonic receiver module and is activated to receive the receiver window of described ultrasonic signal.
26, according to claim 1ly be used for following the tracks of and locating the wireless identification tag of structure and the wireless location system that described a plurality of localized areas are distinguished with a plurality of localized areas, wherein, the position receiver in same presumptive area is linked together by daisy chain.
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