CN115968041A - Ultra-wideband concurrent identification method and system - Google Patents
Ultra-wideband concurrent identification method and system Download PDFInfo
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- CN115968041A CN115968041A CN202211702908.8A CN202211702908A CN115968041A CN 115968041 A CN115968041 A CN 115968041A CN 202211702908 A CN202211702908 A CN 202211702908A CN 115968041 A CN115968041 A CN 115968041A
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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
Technical Field
The invention relates to the technical field of wireless communication, in particular to an ultra-wideband concurrency identification method and an ultra-wideband concurrency identification system.
Background
The ultra-wideband is a carrier-free communication technology for transmitting data by using non-sine wave narrow pulses of nanosecond to picosecond level, and can realize centimeter-level accurate positioning due to the advantage of high time resolution. However, when the number of tags in the same area is too large, ultra-wideband communication collision may occur, which may affect the ranging accuracy and even cause ranging failure, and therefore, timing management needs to be performed on communication between the base station and the tags.
In the application scene of the mine tunnel, the tunnel is long and narrow, wireless signals cannot penetrate through the tunnel wall, and the base station are in linear distribution. If wireless synchronization between adjacent base stations is utilized, the system positioning capacity is greatly reduced due to the fact that synchronization information packets are transmitted step by step, if time synchronization is carried out between the base stations through wires, base station design cost and system complexity are additionally increased, time synchronization is carried out between the base stations and tags, design complexity is increased, meanwhile, the risk that time synchronization is possibly wrong when the tags enter and exit from different positions in a system coverage range is also existed, the registration process for strictly managing time synchronization between the base stations and the tags in the prior art is tedious, and particularly when a large number of tags are simultaneously registered, the problems that the online period of the tags is long and the time utilization efficiency is not high can occur.
Disclosure of Invention
The invention aims to provide an ultra-wideband concurrent identification method and an ultra-wideband concurrent identification system which can improve label registration efficiency and ranging stability.
In order to achieve the above and other related objects, the present invention provides an ultra-wideband concurrency identification method, applied to a base station, the base station wirelessly covering a plurality of tags, the ultra-wideband concurrency identification method including:
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.
In one embodiment of the present invention, the step of allocating a time slot number to the tag and calculating a delay time, and transmitting the time slot number to the tag by allocating a time slot packet, includes:
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.
In one embodiment of the present invention, the step of searching for a free 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.
In one embodiment of the present invention, the calculating the delay time comprises:
acquiring the current moment;
calculating the time slot number, the transmission period and the time slot widthDelay time: t is a unit of delayn ＝(t*n-t 1 ) % T; wherein n represents the time slot number of the tag in the registry, t represents the time slot width, t represents the time 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.
In one embodiment of the present invention, the step of updating the registry and sending the ranging response packet to the tag comprises:
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.
In an embodiment of the present invention, the first time the point-to-point ranging packet is received in the cycle is determined according to the ranging information of the tag in the point-to-point ranging packet.
In an embodiment of the present invention, the step of marking the timeslot 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 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.
In one embodiment of the invention, 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.
In one embodiment of the present invention, when the point-to-point ranging packet and the broadcast ranging packet from the same tag are received in sequence, the broadcast ranging packet is discarded.
In order to achieve the above and other related objects, the present invention further provides an ultra-wideband concurrent identification system, which includes a plurality of tags and a plurality of base stations, wherein one base station wirelessly covers the plurality of 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.
The invention can be applied to mine environment, and adopts time division multiplexing technology, and the base station can allocate time slot for the label and also can carry out distance measurement with the label. When the method is applied to the mine environment, the base station and the label do not need to be strictly time-synchronized, and the system positioning capacity is higher. Meanwhile, the complex label registration process in the mine environment in the past is simplified, the time utilization rate of the system is improved, and the label waiting time is reduced by optimizing the label registration process. Particularly, the invention shortens the waiting period of simultaneous registration of a large number of labels, has higher online speed, and improves the registration rate of the system in unit time and the overall stability of ranging.
Drawings
Fig. 1 is a schematic view of an application scenario of an ultra-wideband concurrency identification method provided by an embodiment of the present invention;
fig. 2 is a specific flowchart of an ultra-wideband concurrency identification method according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of an ultra-wideband concurrency identification method according to an embodiment of the present invention;
fig. 4 is a schematic flowchart of an ultra-wideband concurrent identification system according to an embodiment of the present invention.
Element number description:
1. label (R)
2. Base station
3. Pre-registration package
4. Time slot allocation packet
5. Point-to-point ranging packet
6. Broadcast ranging packet
7. Ranging response packet
8. Distance measuring end bag
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Please refer to fig. 1-4. It should be noted that the drawings provided in this embodiment are only for schematically illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings and not drawn according to the number, shape and size of the components in actual implementation, and the form, quantity and proportion of each component in actual implementation may be arbitrarily changed, and the component layout may be more complicated.
Fig. 1 is a schematic view of an application scenario of an ultra-wideband concurrency identification method provided by an embodiment of the present invention. In a mine environment, a base station 2 wirelessly covers a plurality of tags 1, such as tag 11, tag 12, and tag 13 in the figure. When a plurality of labels are registered or range-measured, the base station allocates time slots for the labels in the registry by receiving data packets sent by the labels so as to determine the delay time of the labels to enter the range measurement. The purpose of concurrent identification is achieved by allocating time slots to different tags for ranging, so that conflict caused by ranging of a plurality of tags in the same time period is avoided, and the efficiency of tag registration or ranging and the utilization rate of a system are improved.
Fig. 2 shows a flow chart of a preferred embodiment of the ultra-wideband concurrency identification method of the present invention.
Fig. 3 is a schematic flowchart of an ultra-wideband concurrent identification method according to an embodiment of the present invention.
The ultra-wideband concurrent identification method of the present invention will be described in detail with reference to fig. 2 and 3.
Step S1: receiving a data packet sent by the label;
specifically, there may be multiple tags 1 in the wireless coverage of the base station 2, and the data packet sent by the tag 1 may be a pre-registration packet for registration, a point-to-point ranging packet for ranging, a broadcast ranging packet, or a ranging end packet.
Step S2: 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 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 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.
In one embodiment, the step of assigning a time slot number to the tag and calculating a delay time, and the step of sending the tag by assigning a time slot packet includes:
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.
In one embodiment, the step of looking up free slots 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.
Specifically, the base station 2 needs to perform type analysis on the data packet of the tag 1, and when the data packet is the pre-registration packet 3, first, it is determined whether the time slot number in the registration table marks the tag 1 according to the tag identifier in the pre-registration packet 3. If the time slot number of the label 1 is marked by the registry, updating the information of the label 1 in the registry and calculating the delay time according to the time slot number to determine the working time allocated to the label 1, and sending the delay time to the label 1 through the time slot allocation packet 4; if the time slot number of the label 1 is not marked in the registry, namely the label 1 initiates a registration request to the base station 2 for the first time in the period, whether the time slot number mark of the registry is in a not full state is judged, if so, according to the transmission period of the label 1 in the pre-registration packet 3, idle time slots meeting the transmission period number and interval of the label 1 are searched in the registry, the time slot number of the idle time slot is allocated to the label 1, the time slot number state of the idle time slot is marked as pre-registration, then the delay time is calculated according to the time slot number of the idle time slot, the delay time is sent to the label 1 through the time slot allocation packet 4, and if the time slot number mark of the registry is in a full state, the pre-registration packet 3 of the label 1 is abandoned.
In one embodiment, the calculating the delay time includes:
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 time slot number of the tag in the registry, t represents the time slot width, t represents the time 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.
Specifically, after the base station 2 determines the current time, the transmission period of the tag 1, and the time slot number and the time slot width allocated to the tag 1, the base station can calculate the periodic delay time and pass the delay time through the time slotThe distribution packet 4 is sent to the tag 1. After receiving the time slot allocation packet 4, the tag 1 enters a ranging mode after a delay time, and periodically sends a point-to-point ranging packet 5 to the base station 2. Wherein the formula T is adopted for calculating the delay time 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.
In one embodiment, the step of updating the registry and sending a ranging response packet to the tag comprises:
and when the point-to-point ranging packet is received for the first time in the period, updating the tag information in the registry and sending the tag information to the tag through the ranging response packet.
In an embodiment, the first time the peer-to-peer ranging packet is received in the cycle is determined according to the ranging information of the tag in the peer-to-peer ranging packet.
Specifically, when the data packet is the 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 the present period, the information of the tag 1 is updated in the registry and the updated tag information is sent to the tag 1 through the ranging response packet 7.
In an embodiment, the step of marking the timeslot 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 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.
Specifically, when the data packet is the broadcast ranging packet 6 and the broadcast ranging packet 6 is received for the first time in the period of the base station 2, the corresponding time slot number is marked as occupied in the registry according to the time when the base station 2 receives the broadcast ranging packet 6, wherein the occupied state of the time slot number is equal to the pre-registration state and the registered state after the registry is updated, and the tag information is sent to the tag 1 through the ranging response packet 7.
In one embodiment, 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.
Specifically, the base station 2 does not receive the point-to-point ranging packet 5 and the broadcast ranging packet 6 sent by the same tag 1, so the base station 2 discards the broadcast ranging packet 6 sent by the tag after receiving the point-to-point ranging packet 5 of the tag 1, wherein the base station determines whether the senders of the point-to-point ranging packet 5 and the broadcast ranging packet 6 are the same tag 1 according to the time interval and the 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 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.
Specifically, when the data packet is the ranging end packet 8, the base station 2 calculates the distance from the tag 1 according to the time scale 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 may be employed between the base station 2 and the tag 1.
The base station can allocate time slots for the tags and also can carry out ranging with the tags, and the time division multiplexing technology of allocating the time slots to different tags for registration or ranging is used, so that the strict time synchronization of the base station and the tags is not needed, and the system positioning capacity is higher. Meanwhile, the complex label registration process in the past is simplified, the system time utilization rate is improved, the label registration process is optimized, the label waiting time is reduced, and the conflict caused by excessive labels in the same area is avoided. Particularly, the invention shortens the waiting period of simultaneous registration of a large number of labels, has higher online speed, and improves the registration rate of the system in unit time and the accuracy and stability of the whole ranging.
With reference to the flowchart of an ultra-wideband concurrent identification system shown in fig. 4, the present invention may further provide an ultra-wideband concurrent identification system, which includes a plurality of tags 1 and a plurality of base stations 2, and one base station 2 wirelessly covers the plurality of tags 1;
the tag 1 is used for sending a data packet to a corresponding base station 2 and receiving an allocation time slot packet 4 and a ranging response packet 7 from the base station 2;
a base station 2, configured to receive a data packet sent by the tag 1 covered by the base station, and determine the type of the data packet:
when the data packet is a pre-registration packet 3, allocating a time slot number for the tag 1, calculating delay time, and sending the delay time to the tag 1 through the allocated time slot packet 4;
when the data packet is the point-to-point ranging packet 5, updating the registry and sending the ranging response packet 7 to the tag 1;
when the data packet is a broadcast ranging packet 6, the time slot number occupied by the tag 1 is marked in the registry and the ranging response packet 7 is sent to the tag 1, and the method is used for calculating the distance between the data packet and the tag 1 when the data packet is a ranging end packet 8.
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 (e.g., base station 21, base station 22 and base station 23), registration is performed by sending the pre-registration packet 3 to the base station 21, and the delay time is obtained by receiving the slot assignment packet 4 sent by the base station 21 to determine the operating time. After the delay time, the tag 1 enters a ranging mode, periodically sends a point-to-point ranging packet 5 to a pre-registered base station 21, receives a ranging response packet 7 sent by the base station 21, sends a ranging end packet 8 to the base station 21 to calculate the distance, immediately sends a broadcast ranging packet 6 to the base station 22 and the base station 23 to perform ranging, receives the ranging response packet 7 sent by the base station 22 and the base station 23 and sends a ranging end packet 8 to the base station 22 and the base station 23, and the base station 22 and the base station 23 calculate the distance to the tag 11 according to the ranging end packet 8.
The present embodiment provides an ultra-wideband concurrent identification system similar to the principle of an ultra-wideband concurrent identification method of the present invention and has all the essential features of the above-mentioned ultra-wideband concurrent identification method.
It should be noted that, the steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, and as long as the steps contain the same logical relationship, the steps are within the scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope 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.
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