CN115968041A - A UWB Concurrent Identification Method and System - Google Patents

Abstract

The invention relates to the technical field of wireless communication, in particular to an ultra wide band concurrent identification method and system, which are applied to a base station, wherein the base station wirelessly covers a plurality of labels and comprises the following steps: receiving a data packet sent by a tag; when the data packet is a pre-registration packet, allocating a time slot number for the label, calculating delay time, and transmitting the time slot number to the label by allocating a time slot packet; when the data packet is a point-to-point ranging packet, updating the registry and sending a ranging response packet; when the data packet is a broadcast ranging packet, marking the time slot number occupied by the label in the registry, and sending a ranging response packet; the data packet is a ranging end packet, and the distance between the data packet and the tag is calculated. The invention can be applied to the mine environment, does not need to carry out strict time synchronization on the base station and the label, and has higher system positioning capacity. Meanwhile, the complex registration process of the conventional label is simplified, the time utilization rate of the system is improved, the label waiting time is reduced by optimizing the label registration process, and the registration rate of the system in unit time and the overall stability of distance measurement are improved.

Description

A UWB Concurrent Identification Method and System

technical field

The invention relates to the technical field of wireless communication, in particular to an ultra-wideband concurrent identification method and system.

Background technique

Ultra-wideband is a carrier-free communication technology that uses nanosecond to picosecond-level non-sinusoidal narrow pulses to transmit data. Because of its high time resolution, it can achieve centimeter-level precise positioning. However, when there are too many tags in the same area, it will cause UWB communication conflicts, which will affect the ranging accuracy and even cause ranging failure. Therefore, it is necessary to manage the timing of the communication between the base station and the tags.

In the application scenario of the mine tunnel, the tunnel is narrow and long, the wireless signal cannot penetrate the tunnel wall, and the base station and the base station are in a linear distribution. If wireless synchronization between adjacent base stations is used, this step-by-step transmission of synchronization information packets will greatly reduce the system positioning capacity. If time synchronization between base stations is performed by wire, it will increase the design cost of the base station and the complexity of the system, and the base station and Time synchronization needs to be performed between tags, which increases the design complexity. At the same time, there is a risk that time synchronization may be wrong when tags enter and leave the coverage area of the system from different locations. The existing technology is used to solve the strict time synchronization management of base stations and tags. The registration process is relatively cumbersome, especially when a large number of tags are registered at the same time, there will be problems such as long tag online cycle and low time utilization efficiency.

Contents of the invention

The purpose of the present invention is to provide an ultra-wideband concurrent recognition method and system that can improve tag registration efficiency and ranging stability.

In order to achieve the above purpose and other related purposes, the present invention provides an ultra-wideband concurrent identification method, which is applied to a base station. The base station wirelessly covers multiple tags. The ultra-wideband concurrent identification method includes:

receiving a data packet sent from the tag;

Determine the type of the data packet:

When the data packet is a pre-registration packet, assign a time slot number to the tag and calculate the delay time, and send it to the tag through the assigned time slot packet;

When the data packet is a point-to-point ranging packet, update the registry and send a ranging response packet to the tag;

When the data packet is a broadcast ranging packet, mark the time slot number occupied by the tag in the registry, and send the ranging response packet to the tag;

If the data packet is a ranging end packet, the distance to the tag is calculated.

In one embodiment of the present invention, the time slot number is assigned to the tag and the delay time is calculated, and the step of sending the packet to the tag through the assigned time slot includes:

Judging whether the registry has marked the time slot number of the tag;

If so, calculate the delay time according to the slot number, and send the delay time to the tag through the allocated slot packet;

If not, then look for the free time slot of the registry;

Allocating the time slot number of at least one free time slot to the tag, calculating the delay time according to the time slot number, and sending the delay time to the tag through the allocated time slot packet described label.

In one embodiment of the present invention, the step of searching for the free time slot of the registry includes:

Obtain the emission period of the tag in the pre-registration package;

Finding at least one of said free time slots that fits said transmit cycle interval.

In one embodiment of the present invention, said calculating the delay time includes:

Get the current moment;

Calculate the delay time according to the time slot number, the transmission period and the time slot width: T _delayn =(t*nt ₁ )%T; wherein, n represents the number of the tag in the registry Time slot number, t represents the time slot width, t ₁ represents the current moment of the base station, and T represents the transmission cycle of the tag.

In one embodiment of the present invention, the steps of updating the registry and sending the ranging response packet to the tag include:

When the point-to-point ranging packet is received for the first time in this period, the tag information in the registry is updated and the tag information is sent to the tag through the ranging response packet.

In an embodiment of the present invention, the receiving of the point-to-point ranging packet for the first time in the current period is determined based on the ranging information of the tag in the point-to-point ranging packet.

In one embodiment of the present invention, marking the time slot number occupied by the tag in the registry, and sending the ranging response packet to the tag includes:

When the broadcast ranging packet is received for the first time in this cycle, the time slot number of the receiving time slot of the broadcast ranging packet is marked as occupied in the registry, and the tag information is passed through the ranging A reply packet is sent to the tag.

In one embodiment of the present invention, the step of calculating the distance from the tag includes:

Obtain the time stamp information in the ranging end packet;

calculating the distance to the tag according to the time scale information and updating the tag information in the registry.

In an embodiment of the present invention, when the point-to-point ranging packet and the broadcast ranging packet from the same tag are successively received, the broadcast ranging packet is discarded.

In order to achieve the above purpose and other related purposes, the present invention also provides an ultra-wideband concurrent identification system, which includes multiple tags and multiple base stations, and one base station wirelessly covers multiple tags;

The label is used to send a data packet to the corresponding base station, and receive a time slot allocation packet and a ranging response packet from the base station;

The base station is used to receive the data packet sent by the tag covered by it, and judge the type of the data packet:

When the data packet is a pre-registration packet, assign a time slot number to the label and calculate the delay time, and send it to the label through the allocated time slot packet;

When the data packet is a point-to-point ranging packet, update the registry and send the ranging response packet to the tag;

When the data packet is a broadcast ranging packet, mark the time slot number occupied by the tag in the registry and send the ranging response packet to the tag, and when the data packet is the end of ranging When wrapping, calculate the distance from the label.

The invention can be applied to the mine environment, adopting the time division multiplexing technology, the base station can allocate time slots for the tags, and can also perform distance measurement with the tags. When the present invention is applied to the mine environment, strict time synchronization of the base station and the tag is not required, and the system positioning capacity is relatively high. At the same time, it simplifies the cumbersome registration process of tags in the mining environment in the past, improves the utilization rate of system time, and reduces the waiting time of tags by optimizing the tag registration process. In particular, the present invention shortens the waiting period for simultaneous registration of a large number of tags, has a faster online rate, and improves the registration rate per unit time of the system and the overall stability of distance measurement.

Description of drawings

FIG. 1 is a schematic diagram of an application scenario of an ultra-wideband concurrent identification method provided by an embodiment of the present invention;

Fig. 2 is a specific flow chart of a UWB concurrent identification method provided by an embodiment of the present invention;

FIG. 3 is a schematic flowchart of an ultra-wideband concurrent identification method provided by an embodiment of the present invention;

Fig. 4 is a schematic flowchart of an ultra-wideband concurrent identification system provided by an embodiment of the present invention.

Component label description:

1 label

2 base stations

3 Pre-registration package

4 slot allocation package

5 point-to-point ranging package

6 broadcast ranging package

7 Ranging response packet

8 Ranging end packet

Detailed ways

Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

See Figures 1-4. It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily during actual implementation, and the component layout type may also be more complicated.

FIG. 1 shows a schematic diagram of an application scenario of an ultra-wideband concurrent identification method provided by an embodiment of the present invention. In the mine environment, the base station 2 wirelessly covers multiple tags 1, such as tag 11, tag 12 and tag 13 in the figure. When multiple tags are registered or ranging, the base station allocates time slots for the tags in the registry by receiving the data packets sent by the tags to determine the delay time of the tags to enter the ranging. The purpose of concurrent identification is achieved by assigning time slots to different tags for ranging, avoiding conflicts caused by multiple tags when ranging in the same time period, and improving the efficiency of tag registration or ranging and system utilization.

Fig. 2 shows a flow chart of a preferred embodiment of the UWB concurrent identification method of the present invention.

Fig. 3 is a schematic flowchart of a UWB concurrent identification method provided by an embodiment of the present invention.

The UWB concurrent identification method of the present invention will be described in detail below with reference to FIG. 2 and FIG. 3 .

Step S1: receiving a data packet sent from the tag;

Specifically, there may be multiple tags 1 within the wireless coverage of base station 2, and the data packets sent by tag 1 may be pre-registration packets for registration, point-to-point ranging packets for ranging, broadcast ranging packets, or ranging End package.

Step S2: Determine the type of the data packet:

When the data packet is a pre-registration packet, assign a time slot number to the tag and calculate the delay time, and send it to the tag through the assigned time slot packet;

When the data packet is a point-to-point ranging packet, update the registry and send a ranging response packet to the tag;

When the data packet is a broadcast ranging packet, mark the time slot number occupied by the tag in the registry, and send the ranging response packet to the tag;

If the data packet is a ranging end packet, the distance to the tag is calculated.

In one embodiment, the time slot number is assigned to the tag and the delay time is calculated, and the step of sending the packet to the tag through the assigned time slot includes:

Judging whether the registry has marked the time slot number of the tag;

If so, calculate the delay time according to the slot number, and send the delay time to the tag through the allocated slot packet;

If not, then look for the free time slot of the registry;

Allocating the time slot number of at least one free time slot to the tag, calculating the delay time according to the time slot number, and sending the delay time to the tag through the allocated time slot packet described label.

In one embodiment, the step of searching for a free time slot in the registry includes:

Obtain the emission period of the tag in the pre-registration package;

Finding at least one of said free time slots that fits said transmit cycle interval.

Specifically, the base station 2 needs to analyze the type of the data packet of the tag 1. When the data packet is the pre-registered packet 3, it first judges whether the time slot number in the registry is tagged with the tag 1 according to the tag identifier in the pre-registered packet 3. If the registry has marked the time slot number of tag 1, update the information of the tag 1 in the registry and calculate the delay time according to the time slot number to determine the working time assigned to tag 1, and pass the delay time Slot allocation packet 4 is sent to label 1; if the registry has not marked the time slot number of label 1, that is, the label 1 initiates a registration request to base station 2 for the first time in this cycle, then it is judged whether the time slot number mark of the registry is If it is not full, then according to the transmission cycle of tag 1 in the pre-registration package 3, search the registry for a free time slot that matches the number and interval of the tag 1’s transmission cycle, and assign the slot number of the free time slot to tag 1 And mark the time slot number status of the free time slot as pre-registration, then calculate the delay time according to the time slot number of the free time slot, and send the delay time to tag 1 through the time slot allocation package 4, if the time slot in the registry If the number is marked as full, the current pre-registration package 3 of label 1 will be discarded.

In one embodiment, the calculating the delay time includes:

Get the current moment;

Calculate the delay time according to the time slot number, the transmission period and the time slot width: T _delayn =(t*nt ₁ )%T; wherein, n represents the number of the tag in the registry Time slot number, t represents the time slot width, t ₁ represents the current moment of the base station, and T represents the transmission cycle of the tag.

Specifically, after the base station 2 determines the current moment, the transmission period of the tag 1, the slot number and the slot width allocated to the tag 1, it can calculate the periodic delay time and send the delay time through the slot allocation packet 4 Give label 1. After receiving the time slot allocation packet 4, the tag 1 enters the ranging mode after a delay time, and then periodically sends the point-to-point ranging packet 5 to the base station 2. Wherein, the calculation delay time adopts the formula T _delayn =(t*nt ₁ )%T; wherein, n represents the time slot number of the tag in the registry, t represents the time slot width, and _t1 represents the The current moment of the base station, T represents the transmission period of the tag.

In one embodiment, the steps of updating the registry and sending the ranging response packet to the tag include:

When the point-to-point ranging packet is received for the first time in this period, the tag information in the registry is updated and the tag information is sent to the tag through the ranging response packet.

In an embodiment, the receiving of the point-to-point ranging packet for the first time in the current period is determined according to the ranging information of the tag in the point-to-point ranging packet.

Specifically, when the data packet is a point-to-point ranging packet 5 and the point-to-point ranging packet 5 is received by the base station 2 for the first time in this cycle, the information of the tag 1 is updated in the registry and the updated tag information is passed through the measurement method. Response packet 7 is sent to tag 1.

In one embodiment, marking the time slot number occupied by the tag in the registry, and sending the ranging response packet to the tag includes:

When the broadcast ranging packet is received for the first time in this cycle, the time slot number of the receiving time slot of the broadcast ranging packet is marked as occupied in the registry, and the tag information is passed through the ranging A reply packet is sent to the tag.

Specifically, when the data packet is a broadcast ranging packet 6 and the broadcast ranging packet 6 is received by the base station 2 in this cycle for the first time, then according to the time when the base station 2 receives the broadcast ranging packet 6, mark the corresponding time in the registry The slot number is occupied, and the occupied state of the time slot number is equal to the pre-registered state and the registered state after the registry update, and the tag information is sent to the tag 1 through the ranging response packet 7 .

In an embodiment, when the point-to-point ranging packet and the broadcast ranging packet from the same tag are successively received, the broadcast ranging packet is discarded.

Specifically, the base station 2 will not receive the point-to-point ranging packet 5 and the broadcast ranging packet 6 sent from the same tag 1, so when the base station 2 receives the point-to-point ranging packet 5 of the tag 1, it will discard the broadcast ranging packet sent by the tag Packet 6, wherein the base station determines whether the sender of the point-to-point ranging packet 5 and the broadcast ranging packet 6 is the same tag 1 according to the time interval and ranging information of receiving the point-to-point ranging packet 5 and the broadcast ranging packet 6 .

In one embodiment, the step of calculating the distance from the tag includes:

Obtain the time stamp information in the ranging end packet;

calculating the distance to the tag according to the time scale information and updating the tag information in the registry.

Specifically, when the data packet is the ranging end packet 8, the base station 2 calculates the distance to the tag 1 according to the time stamp information of the tag 1 in the ranging end packet 8, and updates the information of the tag 1 in the registry.

Specifically, asymmetric bilateral two-way ranging can be used between the base station 2 and the tag 1 .

In the present invention, the base station can allocate time slots for the tags, and can also perform ranging with the tags. By using the time-division multiplexing technology that allocates time periods to different tags for registration or ranging, strict time synchronization between the base station and the tags is not required. The system positioning capacity is high. At the same time, it simplifies the cumbersome registration process of tags in the past, improves the utilization rate of system time, and reduces the waiting time of tags by optimizing the tag registration process, avoiding conflicts caused by too many tags in the same area. In particular, the present invention shortens the waiting period for simultaneous registration of a large number of tags, has a faster online rate, and improves the registration rate per unit time of the system as well as the overall accuracy and stability of distance measurement.

In combination with the flow diagram of an ultra-wideband concurrent identification system shown in Figure 4, the present invention can also provide an ultra-wideband concurrent identification system, including multiple tags 1 and multiple base stations 2, and one base station 2 wirelessly covers multiple tags 1;

The tag 1 is used to send a data packet to the corresponding base station 2, and receive the allocated time slot packet 4 and the ranging response packet 7 from the base station 2;

The base station 2 is configured to receive the data packet sent by the tag 1 covered by it, and determine the type of the data packet:

When the data packet is a pre-registration packet 3, assign a slot number to the tag 1 and calculate the delay time, and send it to the tag 1 through the assigned slot packet 4;

When the data packet is a point-to-point ranging packet 5, then update the registry and send the ranging response packet 7 to the tag 1;

When the data packet is a broadcast ranging packet 6, mark the time slot number occupied by the tag 1 in the registry and send the ranging response packet 7 to the tag 1, and for when the data When the packet is distance measurement end packet 8, the distance to tag 1 is calculated.

In a specific embodiment, with reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, when the tag 11 is in the wireless coverage of multiple base stations (such as base station 21, base station 22 and base station 23), by sending a pre-registration to the base station 21 Packet 3 is registered, and the delay time is determined by receiving the time slot allocation packet 4 sent by the base station 21 to determine the working time. After the delay time, the tag 1 enters the ranging mode, periodically sends the point-to-point ranging packet 5 to the pre-registered base station 21, and receives the ranging response packet 7 sent by the base station 21, and then the tag 1 sends the ranging end packet 8 to the base station 21 Calculate the distance, then send the broadcast ranging packet 6 to the base station 22 and the base station 23 for ranging, and then send the ranging end packet 8 to the base station 22 and the base station 23 by receiving the ranging response packet 7 sent by the base station 22 and the base station 23, the base station 22 and the base station 23 calculate the distance to the tag 11 according to the ranging end packet 8 .

The ultra-wideband concurrent identification system provided in this embodiment is similar in principle to the ultra-wideband concurrent identification method of the present invention and has all the basic features of the above-mentioned ultra-wideband concurrent identification method.

It should be noted that the division of steps in the above methods is only for clarity of description. During implementation, some steps can be combined into one step or split into multiple steps. As long as they contain the same logical relationship, they are all included in this Within the scope of protection of the patent; adding insignificant modifications to the algorithm or process or introducing insignificant designs, but not changing the core design of the algorithm and process are all within the scope of protection of the patent.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention.

The above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced. Without departing from the spirit and scope of the technical solution of the present invention.

Claims (10)

1. An ultra-wideband concurrency identification method, applied to a base station, wherein the base station wirelessly covers a plurality of tags, the ultra-wideband concurrency identification method comprising:

receiving a data packet sent by the label;

judging the type of the data packet:

when the data packet is a pre-registration packet, allocating a time slot number to the label, calculating delay time, and sending the delay time to the label through allocating a time slot packet;

when the data packet is a point-to-point ranging packet, updating a registry and sending a ranging response packet to the tag;

when the data packet is a broadcast ranging packet, the time slot number occupied by the tag is marked in the registry, and the ranging response packet is sent to the tag;

and if the data packet is a ranging end packet, calculating the distance between the data packet and the tag.

2. The method of claim 1, wherein the step of assigning a time slot number to the tag and calculating a delay time, and the step of transmitting the tag with an assigned time slot packet comprises:

judging whether the registry marks the time slot number of the label or not;

if so, calculating the delay time according to the time slot number, and sending the delay time to the label through the distribution time slot packet;

if not, searching the idle time slot of the registry;

and allocating the time slot number of at least one idle time slot to the label, calculating the delay time according to the time slot number, and sending the delay time to the label through the allocated time slot packet.

3. The method of claim 2, wherein the step of searching for a free time slot of the registry comprises:

acquiring the transmission period of the label in the pre-registration packet;

and searching at least one idle time slot corresponding to the transmission period interval.

4. The method of claim 1, wherein the calculating the delay time comprises:

acquiring the current moment;

calculating the delay time according to the time slot number, the transmission period and the time slot width: t is _delayn ＝(t*n-t ₁ ) % T; wherein n represents the slot number of the tag in the registry, t represents the slot width, t represents the slot number of the tag in the registry, and ₁ represents the current time of the base station and T represents the transmission period of the tag.

5. The method of claim 1, wherein the steps of updating the registry and sending a ranging response packet to the tag comprise:

and when the point-to-point ranging packet is received for the first time in the period, updating the label information in the registry and sending the label information to the label through the ranging response packet.

6. The UWB concurrency identification method of claim 5 wherein the first time the point-to-point ranging packet is received in the period is determined according to the ranging information of the tag in the point-to-point ranging packet.

7. The method of claim 1, wherein the step of marking the timeslot number occupied by the tag in the registry and sending the ranging response packet to the tag comprises:

when the broadcast ranging packet is received for the first time in the period, the time slot number of the receiving time slot of the broadcast ranging packet is marked as occupied in the registry, and the tag information is sent to the tag through the ranging response packet.

8. The ultra-wideband concurrency identification method according to claim 1, wherein the step of calculating the distance to the tag comprises:

acquiring time mark information in the ranging end packet;

and calculating the distance between the label and the time mark information according to the time mark information and updating the label information in the registry.

9. The UWB concurrency detection method of claim 1 wherein the broadcast ranging packet is discarded when the point-to-point ranging packet and the broadcast ranging packet from the same tag are received in sequence.

10. An ultra-wideband concurrent identification system is characterized by comprising a plurality of tags and a plurality of base stations, wherein one base station wirelessly covers the tags;

the label is used for sending a data packet to a corresponding base station and receiving an allocation time slot packet and a ranging response packet from the base station;

the base station is used for receiving the data packet sent by the label covered by the base station and judging the type of the data packet:

when the data packet is a pre-registration packet, allocating a time slot number for the label, calculating delay time, and sending the delay time to the label through the allocated time slot packet;

when the data packet is a point-to-point ranging packet, updating a registry and sending the ranging response packet to a tag;

and when the data packet is a broadcast ranging packet, marking the time slot number occupied by the label in the registry and sending the ranging response packet to the label, and when the data packet is a ranging end packet, calculating the distance between the data packet and the label.

Images