CN101750598B - Wearable indoor positioning system based on radio frequency identification technology and method thereof - Google Patents

Abstract

The invention discloses a wearable indoor positioning system and method based on radio frequency identification technology. RFID electronic tags are used as the receiving end infrastructure to be buried on the ground in a known environment, and the ID identification of each RFID electronic tag and its location are established. One-to-one mapping of coordinate information; the transmitter reader and reader antenna are sewn on the user's clothing; the user first reads the RFID of the known environment stored in the user area of the map record tag after entering the known environment The mapping relationship table between the electronic tag ID and geographic information, and then read the RFID electronic tag ID information within the range of the reader antenna with a fixed sampling period, and calculate the current location of the user in real time, and display it on the display unit In order to provide users with real-time response, high-precision, and low-cost indoor positioning solutions.

Description

A wearable indoor positioning system and method based on radio frequency identification technology

technical field

The invention relates to the technical field of wireless indoor positioning, in particular to a wearable indoor positioning system and method based on radio frequency identification technology.

Background technique

With the development of wireless communication technology, people's demand for positioning and navigation is increasing, especially in complex indoor environments, such as airport halls, exhibition halls, warehouses, supermarkets, libraries, parks, underground parking lots, mines, etc. In the process, it is necessary to use mobile terminals to provide location information for personnel, facilities and objects. Therefore, many solutions for indoor positioning technology have been proposed, including A-GPS positioning technology, ultrasonic positioning technology, Bluetooth technology, infrared technology, ultra-wideband technology, wireless local area network, light tracking positioning technology, image analysis, beacon positioning , computer vision positioning technology, etc. have been widely studied, and some have even entered the stage of commercial application.

Common positioning technologies can be summarized in the following ways: 1) positioning technology for measuring signal direction (signal angle of arrival, referred to as AOA); 2) positioning technology for measuring signal power; 3) measuring signal propagation time characteristics (arrival time, TOA for short; or Time Difference of Arrival, TDOA for short). The above methods all need to deploy the transmitting terminal infrastructure that actively transmits signals in the environment in advance, such as navigation satellites, communication base stations or interrogators, etc., and the user passively receives the signals of the transmitting terminal infrastructure through the receiving terminal equipment carried by the user, such as GPS navigator, mobile phone or mobile node (Node), etc., and analyze through different algorithms, and finally get the relevant information of the current location. Generally, the cost of the transmitter that actively transmits signals is relatively high, while the cost of the passive receiver is relatively low. Therefore, this method is suitable for many application modes of the receiver and can effectively reduce the total cost of the system. However, the above method is limited by some objective conditions, such as the time synchronization between the transmitter infrastructure and the receiver equipment, environmental interference, multipath propagation effects of electromagnetic waves, and complex indoor environments. Large errors and low positioning accuracy, so far there is no technology that can meet the positioning requirements for complex indoor environments.

Another reason why the aforementioned common positioning technologies are not suitable for indoor positioning lies in the particularity of indoor positioning applications. In order to allow wireless signals to cover all ranges of the indoor environment, it is necessary to arrange a large number of transmitter infrastructures in the indoor environment, which will inevitably increase the total cost of the system. Therefore, a new technology and mode are needed to solve indoor positioning. question.

The full name of RFID is radio frequency identification (Radio Frequency Identification), which is a non-contact automatic identification technology realized by radio frequency technology. RFID electronic tags have the characteristics of small size, fast reading and writing speed, various shapes, long service life, reusable, large storage capacity, and can penetrate non-conductive materials. Combining RFID readers can realize multi-target identification and moving targets Identification, and further through the combination with Internet technology, it can also realize the tracking of items and the sharing of information on a global scale.

There have been some public reports on the use of active RFID products for indoor positioning. However, the cost of active RFID products is relatively high, which is not conducive to promotion. Passive RFID products, especially UHF frequency band RFID products with a working frequency of 840-960 MHz, usually have a reading distance of 1 meter to 10 meters according to the size of the transmission power. The writer is used as the transmitter infrastructure, and few people use it.

Contents of the invention

In order to solve the problems of the prior art, the object of the present invention is to bind the wearable reader-writer as the transmitter to the human body that needs indoor positioning by using the passive RFID electronic tag as the infrastructure, and to provide a real-time Responsive, high-precision, low-cost wearable indoor positioning system and method based on radio frequency identification technology.

In order to achieve the stated purpose, one aspect of the present invention provides a wearable indoor positioning system based on radio frequency identification technology, which includes:

An RFID electronic tag is used as the receiving end, fixed on the ground surface of the known indoor environment, and the ID identification information of the RFID electronic tag and the coordinate information of the location are established;

A ground laying body, laid on the ground surface and the RFID electronic tag, for fixing and protecting the RFID electronic tag;

A map record tag, placed in a prominent position at the entrance of the known indoor environment, used to store an ID identification information of the RFID electronic tag and a piece of user area information;

A reader antenna is used as the transmitting end, which is sewn on the user's clothing, and the user is located in a known indoor environment;

A reader, which is sewn on the user's clothing and connected to the reader antenna, the user is located in a known indoor environment, and is used to read the ID identification information and position coordinate information of the RFID electronic tag;

A microprocessor unit is connected with the reader, and is used to receive the ID identification information sent by the reader to calculate the current location of the user in real time;

A display unit is connected with the microprocessor unit for displaying the current location of the user;

A power supply unit is respectively connected with the reader, the microprocessor unit and the display unit for supplying power.

In order to achieve the stated purpose, another aspect of the present invention provides a wearable indoor positioning method based on radio frequency identification technology, comprising the following steps:

Step 1: start the power supply unit and initialize;

Step 2: The user walks into the entrance of the known environment wearing the clothes sewn with the reader antenna and the reader;

Step 3: The reader reads an ID identification information and sends it to the microprocessor unit;

Step 4: The microprocessor unit judges whether it belongs to the map record label according to the ID identification information, and if so, sends an instruction to the reader to read the RFID electronic label ID identification and geographical location of the known environment stored in the map record label user area The mapping relationship table of the information is sent to the microprocessor unit; if not, it is invalid and re-enters step 202;

Step 5: The microprocessor unit establishes a visual image of the environmental geographic information according to the mapping relationship table between the received RFID tag ID and geographic information, and displays it in the form of a map in the display unit;

Step 6: The user enters the known environment, and the reader reads all the map record tags and ID identification information on the RFID electronic tag within the range of the reader antenna with a fixed sampling period, and sends them to the microprocessor unit;

Step 7: The microprocessor unit filters out the ID identification information of the map record label according to the received ID identification information;

Step 8: The microprocessor unit uses the ID identification information of the RFID electronic tag to calculate the current location of the user, and displays the location on the map of the display unit;

Step 9: Whether to enter the next sampling period, if yes, then repeat step 206; if not, then enter the next step;

Step 10: Turn off the power supply unit and end this use.

The beneficial effects of the present invention are: 1) Utilize the passive RFID electronic tag as a geographical mark and bury it on the ground in a known environment in advance, which can give full play to the advantages of low cost of the passive RFID electronic tag, thereby greatly reducing the infrastructure investment of the positioning system ;2) When the deployment density of RFID electronic tags is constant, the positioning accuracy can be controlled by adjusting the output power of the reader-writer at the transmitting end. Within the common reading distance, the greater the output power, the smaller the positioning error will be; 3) The miniaturized reader-writer module is sewn together with the person's clothes so that it does not affect the normal movement of the human body and realizes the real-time positioning of the person in a known environment.

Description of drawings

Fig. 1 is a schematic diagram of a wearable indoor positioning system based on radio frequency identification technology provided by the present invention.

Fig. 2 is a flowchart of a wearable indoor positioning method based on radio frequency identification technology provided by the present invention.

Fig. 31 and Fig. 32 are positioning effect diagrams of the wearable indoor positioning method based on radio frequency identification technology in the embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

The wearable indoor positioning system and method based on radio frequency identification technology provided by the present invention are realized based on radio frequency technology (Radio Frequency Identification, RFID). RFID technology is a non-contact automatic identification technology realized by radio frequency technology. RFID electronic tags have fast reading and writing speeds, large storage capacity, and can penetrate non-conductive materials. At the same time, passive RFID electronic tags can be read in batches at long distances (several meters to 10 meters) under non-line-of-sight, which has become a solution One of the effective schemes for indoor localization problems.

As shown in Figure 1, Figure 1 is a schematic diagram of a wearable indoor positioning system based on radio frequency identification technology provided by the present invention, which includes a floor laying body 1, an RFID electronic tag 2, a map recording tag 3, a reader antenna 4, a read-write 5, clothing 6, power supply unit 7, microprocessor unit 8 and display unit 9. In one embodiment of the present invention, the RFID electronic label 2 selects a UHF frequency band electronic label conforming to the ISO/IEC18000-6C protocol, which only contains a 64-bit EPC code and has no user area; the map record label 3 selects a conforming ISO/IEC 18000-6C The UHF electronic tag of the protocol includes 64-bit EPC code and 4K byte user area, which can store up to 32768 two-dimensional geographic coordinate information; the reader 5 uses a portable ultra-high-frequency electronic tag developed based on the SkyeModule M9 reader module. Frequency reader, the output power is 23dBm; the antenna 4 of the reader is an omnidirectional radiation antenna with a ceramic substrate, and the gain is 4dBi. RFID electronic tags 2 are fixed on the surface of a rectangular indoor environment with an area of 90 square meters (length*width=9*10), and are laid at intervals of 0.6 meters. On the ground surface and the RFID electronic tag 1, it plays the role of fixing and protecting the RFID electronic tag 1; a map record label 3 is placed on a striking red marker, and placed in a prominent position at the entrance of the known indoor environment. The user enters the environment wearing the clothing 6 integrated with the reader-writer antenna 4 and the reader-writer 5 , wherein the reader-writer antenna 4 is sewn on the leg of the clothing 6 and connected to the reader-writer 5 , and the reader-writer 5 is sewn on The waist position of the clothing 6 is connected to the microprocessor unit 8, which is further connected to the display unit 9, and the power supply unit 7 provides power for the reader 5, the microprocessor unit 8 and the display unit 9 respectively. Its principle is to use the RFID electronic tag 2 as the receiving end infrastructure to bury it on the ground in a known environment, and establish a one-to-one mapping between the ID mark of each RFID electronic tag 2 and the coordinate information of its location; the transmitting end reader-writer 5 and The reader antenna 4 is sewn on the user's clothing; the user first reads the mapping of the ID mark and geographical information of the RFID electronic tag 2 of the known environment stored in the map record label 3 user area after entering the known environment Relational table, then read the ID identification information of the RFID electronic tag 2 within the effective range of the reader antenna 4 with a fixed sampling period, and calculate the current position of the user in real time by the microprocessor unit 8, and display it on the display unit 9 on the map.

The power supply unit 7, the microprocessor unit 8 and the display unit 9 can be sewn into the clothing 6 together with the reader antenna 4 and the reader 5, or can be used as an independent external device with the reader 5 sewn into the clothing 6 connected.

In one embodiment of the present invention, the power supply unit 7, the microprocessor unit 8 and the display unit 9 can be replaced by a laptop computer. The notebook computer transmits data with the reader-writer 5 through the USB interface, and provides +5V voltage for the reader-writer 5 . In this way, the user can check his real-time location information on the map by wearing the clothing 6 integrated with the reader-writer antenna 4 and the reader-writer 5 , and through a hand-held laptop computer.

As another embodiment of the present invention, the power supply unit 7 and the microprocessing unit 8 are also integrated on the clothing 6, wherein the power supply unit 7 is sewn on the back position of the clothing 6 in the form of a lithium battery, and the microprocessor unit 8 and the reader 5 Enclosed in the same casing, sewn on the waist position of the clothing 6, the display unit 9 is a helmet-mounted display worn on the user's head. In this way, the user enters the environment wearing the clothing 6 integrated with the reader-writer antenna 4, the reader-writer 5, the power supply unit 7 and the micro-processing unit 8, and can see the current location of himself in the helmet-mounted display as the display unit 9. Location.

When the design of the reader-writer antenna 4 remains unchanged, the transmission power of the reader-writer 5 directly determines the effective operating distance of the reader-writer antenna 4 . If the deployment density of the RFID electronic tags 2 on the surface is constant, increasing the transmission power of the reader 5 can make the effective distance of the reader antenna 4 farther, thereby reading more RFID electronic tags 2 within a sampling period . Therefore, according to the gradual reduction of the transmitting power of the reader-writer 5 , the position where the reader-writer antenna 4 can be sewn to the legs of the clothing 6 gradually decreases. In order not to affect the normal movement of the user, the reader antenna 4 can be sewn on the front or outside of the thigh, the upper side of the knee, the front or outside of the calf, or the outside of the ankle of the clothing 6 .

The content that can be stored and read by the RFID electronic tag 2 has two parts, one is its ID identification information, usually a string of 64-bit or 96-bit unique codes generated according to the coding standard format; the other part is the user area, the user can according to You need to store all kinds of information in it. When the reader/writer 5 reads the RFID electronic tag 2, it usually only reads its ID identification information. If it is necessary to read the content of the user area, it is necessary to read the ID identification information of the RFID electronic tag 2 first, and then operate on the content of the user area. Since the map record tag 3 needs to store the mapping relation table between the ID identifier of the RFID electronic tag 2 and geographic information in a known environment, the user area of the RFID electronic tag 2 must be utilized. In this way, two pieces of information are stored in the map record label 3, which are respectively an ID identification information and a section of user area information, wherein the previous one or more specific bits of the ID identification information are fixed information, which are used to distinguish the map record label from the laying area. On the RFID electronic tag on the ground surface, the remaining bits are the unique identification of the map record tag 3, and the user area information stores the mapping relationship table between the ID identification of the RFID electronic tag 2 in a known environment and geographic information. In one embodiment of the present invention, the ID identification information of the map record label 3 is "000000000E0003E0", wherein the first four (16 bits) "0000" are preset fixed information used to represent the map record label 3, and the following The 12-bit (48-bit) "00000E0003E0" is the unique identifier of the map record label 3.

However, only one ID identification information needs to be stored in the RFID electronic tag 2, so a low-cost electronic tag without a user area can be selected. The first one or more specific bits of its ID identification information are fixed information different from the ID identification information of the map record label 3, and the remaining bits are the unique identification of the RFID electronic tag. In one embodiment of the present invention, the first four ID identification information in a group of RFID electronic tags are "E007000019D2417F", "E007000019D24173", "E007000019D2411B", "E007000019D240A5", respectively, wherein the first four digits of each ID identification information (16 bits) "E007" is the preset fixed information used to represent the RFID electronic tag. Unique identifier for the tag.

The geographical information mapping relationship table stored in the user area of the map record label 3 includes the one-to-one mapping between the two-dimensional or three-dimensional coordinate information of the location in the known environmental space coordinate system and the ID identification of the RFID electronic tag 2, and may also include the location The mapping of status and attribute information such as the color, material, whether there are edges and corners, whether it can be moved, etc. of the position. In one embodiment of the present invention, the mapping relationship table between the ID identification and geographical information of the RFID electronic tag 2 of the known environment stored in the user area is:

0,0=E007000019D2417F

1, 0 = E007000019D24173

2,0=E007000019D2411B

3,0=E007000019D240A5

4,0=E007000019D240C5

5,0=E007000019D240C3

0, 1 = E007000019D24196

1, 1 = E007000019D2415A

2,1=E007000019D24165

3,1=E0070000132E26E4

The two numbers before the equal sign respectively correspond to the abscissa and ordinate of the point on the two-dimensional planar map of the known environment coordinate system, and the character string behind the equal sign represents the ID identification information of the RFID electronic tag 2 corresponding to the point.

The microprocessor unit 8 is used to receive the map record label 3 and the RFID electronic label 2 information sent by the reader-writer 5, and utilize the ID identification and geographical information of the RFID electronic label 2 of the known environment stored in the map record label 3 user area The mapping relationship table establishes a visual image of geographic information. After the microprocessor unit 8 further receives the RFID electronic tag 2 information sent by the reader-writer 5, it calculates the current geographic location according to the ID identification information of the RFID electronic tag 2, and displays it to the user on the display unit 9.

As shown in Figure 2, the flow chart of the wearable RFID indoor positioning method provided by the present invention includes the following steps:

Step 201: Start the power supply unit 7 and initialize it;

Step 202: The user walks into the entrance of the known environment wearing the clothing 6 sewn with the reader-writer antenna 4 and the reader-writer 5 ;

Step 203: the reader 5 reads an ID and sends it to the microprocessor unit 8;

Step 204: the microprocessor unit 8 judges whether it belongs to the map record label 3 according to the ID identification information, and if so, sends an instruction to the reader-writer 5 to read the RFID electronic label of the known environment stored in the map record label 3 user area 2 ID mark and the mapping relationship table of geographical information, then send its mapping relationship table to the microprocessor unit 8; If not, then invalid, re-enter step 202;

Step 205: The microprocessor unit 8 establishes a visualized image of the environmental geographic information according to the mapping relationship table between the ID identification of the received RFID electronic tag 2 and the geographic information, and displays it in the form of a map in the display unit 9;

Step 206: The user enters the known environment, and the reader 5 reads all the map record tags 3 and the ID identification information on the RFID electronic tag 2 within the effective range of the reader antenna 4 with a fixed sampling period, and sends them to the micro processor unit 8;

Step 207: The microprocessor unit 8 filters out the ID identification information of the map record label 3 according to the received ID identification information;

Step 208: the microprocessor unit 8 utilizes the ID identification information of the RFID electronic tag 2 to calculate the current location of the user, and displays the location on the map of the display unit 9;

Step 209: Whether to enter the next sampling period, if yes, then repeat step 206; if not, then enter the next step;

Step 210: Turn off the power supply unit 7 to end this use.

In step 204, the microprocessor unit 8 judges whether it belongs to the map recording label 3 according to the ID identification information, and judges according to the fixed information of one or more specific bits before the ID identification information. When the defined map record tag 3 is defined, the microprocessor unit 8 judges that it is a map record tag 3, and when the specific bit information belongs to a predefined RFID electronic tag 2, the microprocessor unit 8 judges that it is an RFID electronic tag 2. As in the aforementioned embodiment, the first four digits (16 bits) "0000" of the ID identification information of the RFID electronic tag 2 are preset fixed information used to represent the map record tag 3, and "E007" is the preset It is used to represent the fixed information of the RFID electronic tag 2. By reading the first four digits and comparing them with the preset fixed information, it is possible to quickly determine whether it belongs to the map record label 3 or the RFID electronic label 2 according to a certain ID identification information.

In step 208, the microprocessor unit 8 utilizes the ID identification information of the RFID electronic tag 2 to calculate the user's current location, and when the ID identification information received in a sampling period is one, then the ID identification information The corresponding space coordinate position is the current position. For example, when the space coordinate corresponding to the ID identification information is (2, 3), the calculation result of the current position is (2, 3); When there are multiple ID identification information received, the centroid of the spatial coordinate positions corresponding to the multiple ID identification information is calculated as the current location. If three ID identification information are received at the same time, the corresponding spatial coordinates are respectively ( 2, 2), (3, 2), (3, 1), the calculation result of the current location is (8/3, 5/3).

Figure 31 and Figure 32 are the positioning effect diagrams of the wearable RFID indoor positioning method in the embodiment of the present invention. First, deploy the location of the maze in a known environment, and mark the best route as a reference, as shown in Figure 31. In the embodiment, the user holds a notebook computer used to replace the power supply unit 7, the microprocessor unit 8 and the display unit 9, and wears the clothing 6 integrating the reader antenna 4 and the reader 5 to enter the maze entrance and the final good route. The deployment density of the RFID electronic tags 2 is 0.6 meters apart, and the sampling period of the reader-writer 5 is 0.5 seconds. According to the aforementioned method of the present invention, the position connection at the end of each sampling period is calculated as shown in Figure 32, and the errors are all less than 0.3 rice. It can be seen from the figure that although the wearable indoor positioning method based on radio frequency identification technology provided by the present invention is affected by factors such as the reading rate of the reader and the electromagnetic interference of the human body, there is still a certain positioning error, but it is different from the current Compared with other existing RFID indoor positioning methods, the positioning accuracy is still relatively high, which can meet the user's requirements for real-time response, high precision, and low cost of indoor positioning.

The above description is used to realize the present invention and its embodiments, and the scope of the present invention should not be limited by the description. Those skilled in the art should understand that any modification or partial replacement without departing from the scope of the present invention belongs to the present invention. The scope of the invention is defined by the claims.

Claims (10)

1. the wearable indoor positioning system based on REID is characterized in that, comprising:

One RFID electronic tag is fixed on the face of land of known indoor environment as receiving end, sets up the ID sign of each RFID electronic tag and the coordinate information of its position and shines upon one by one;

One floor pavement body is laid on the face of land and the RFID electronic tag, is used for fixing and protects the RFID electronic tag;

One map writes down label, places the remarkable position, porch of this known indoor environment, is used to store an ID identification information and one section user area information of map record label;

One reading and writing device antenna is sutured on user's the clothing as transmitting terminal, and the user is positioned at known indoor environment;

One read write line is sutured on user's the clothing, and links to each other with reading and writing device antenna, and the user is positioned at known indoor environment, is used to read the ID identification information of RFID electronic tag and the coordinate information of position;

One microprocessor unit links to each other with read write line, and the ID identification information that is used to receive the RFID electronic tag that read write line sends calculates the position at the current place of user in real time;

One display unit links to each other with microprocessor unit, is used to show the position at the current place of user;

One power supply unit is connected with read write line, microprocessor unit and display unit respectively, is used to provide power supply.

2. the wearable indoor positioning system based on REID according to claim 1; It is characterized in that: said reading and writing device antenna is sutured in the leg position of clothing; Be reducing gradually according to the read write line emissive power; Can the position that reading and writing device antenna is sutured in the shank of clothing be reduced gradually; In order not influence user's proper motion, thigh front side or big leg outer side, knee upside, shank front side or the shank outside, the ankle outer fix that can be chosen in clothing are sewed up reading and writing device antenna.

3. the wearable indoor positioning system based on REID according to claim 1; It is characterized in that: an ID identification information and one section user area information of said map record tag storage; Wherein previous or a plurality of certain bits of ID identification information are fix information; Be used to distinguish map record label and be laid on the RFID electronic tag on the face of land, all the other are the unique identification of this map record label; The RFID electronic tag ID sign of said user area information stores known environment and the mapping relations table of geography information.

4. the wearable indoor positioning system based on REID according to claim 3; It is characterized in that: the geography information mapping relations table of said map record tagging user district stored comprises the two dimension of this position in the known environment space coordinates or the mapping one by one of three-dimensional coordinate information and RFID electronic tag ID sign at least.

5. the wearable indoor positioning system based on REID according to claim 1; It is characterized in that: said RFID electronic labeling information is only stored an ID identification information; Its previous or a plurality of certain bits are and map record label ID identification information different fixed information that all the other are the unique identification of this RFID electronic tag.

6. the wearable indoor positioning system based on REID according to claim 1; It is characterized in that: said microprocessor unit is used to receive map record label and the RFID electronic labeling information that read write line sends; Set up the visual image of geography information; Calculate the current geographic position of living in of user according to the RFID electronic labeling information, and in display unit, show to the user.

7. the wearable indoor positioning system based on REID according to claim 1; It is characterized in that: said power supply unit, microprocessor unit and display unit both can be sutured in the clothing with reading and writing device antenna and read write line, and the read write line in also can be used as independent external equipment and being sutured in clothing links to each other.

8. the Wearable indoor orientation method based on REID is characterized in that, may further comprise the steps:

Step 1: start power supply unit and initialization;

Step 2: the user wears the porch that the clothing that is sewed with reading and writing device antenna and read write line enters into known environment;

Step 3: read write line reads an ID identification information, and sends to microprocessor unit;

Step 4: whether it belongs to map record label to microprocessor unit according to the ID identification information judgment; In this way; Then send instruction to read write line; Read the mapping relations table of RFID electronic tag ID sign and geography information of the known environment of map record tagging user district stored, send it to microprocessor unit again; As not, then invalid, get into step 2 again;

Step 5: microprocessor unit is set up the visual image of this environmental geography information, and in display unit, is shown with the ground diagram form according to the mapping relations table of the RFID electronic tag ID sign that receives with geography information;

Step 6: the user gets into this known environment, and read write line writes down the ID identification information on label and the RFID electronic tag with the figure fully that fixed sample period reads in the reading and writing device antenna reach, and sends to microprocessor unit;

Step 7: microprocessor unit is according to received ID identification information, and the filtering map writes down the ID identification information of label;

Step 8: microprocessor unit utilizes the ID identification information of RFID electronic tag to calculate the position at the current place of user, and with this position display on the map of display unit;

Step 9: whether get into the next sampling period, in this way, then repeating step 6; As not, then get into next step;

Step 10: close power supply unit, finish this use.

9. the Wearable indoor orientation method based on REID according to claim 8; It is characterized in that: whether it belongs to map record label to said microprocessor unit according to the ID identification information judgment; Be to make a decision according to this ID identification information fix informations previous or a plurality of certain bits; When this certain bits information belongs to predefined map record label; Then microprocessor unit judges that it is map record label, and when this certain bits information belonged to predefined RFID electronic tag, it was the RFID electronic tag for the microprocessor unit judgement.

10. the Wearable indoor orientation method based on REID according to claim 8; It is characterized in that: said microprocessor unit utilizes the ID identification information of RFID electronic tag to calculate the position at the current place of user; When ID identification information received in a sampling period is one; Then the pairing volume coordinate of this ID identification information position is current position; When ID identification information received in a sampling period when being a plurality of, the barycenter that then calculates the pairing volume coordinate of a plurality of ID identification informations position is current position.

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