CN114867096A - Wireless time service system and wireless time service method based on UWB - Google Patents
Wireless time service system and wireless time service method based on UWB Download PDFInfo
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- CN114867096A CN114867096A CN202210782353.6A CN202210782353A CN114867096A CN 114867096 A CN114867096 A CN 114867096A CN 202210782353 A CN202210782353 A CN 202210782353A CN 114867096 A CN114867096 A CN 114867096A
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- slave station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/005—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by adjustment in the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/33—Services specially adapted for particular environments, situations or purposes for indoor environments, e.g. buildings
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a UWB-based wireless time service system and a wireless time service method, wherein the wireless time service system comprises a UWB wireless time service master station, a UWB wireless time service slave station, a time service-needing device and a standard time device, the UWB wireless time service master station is connected with the standard time device, the UWB wireless time service master station is wirelessly connected with the UWB wireless time service slave station, and the UWB wireless time service slave station is connected with the time service-needing device. The standard time information is input into the UWB wireless time service master station through the standard time equipment, then the standard time information is input into the UWB wireless time service slave station through the UWB wireless time service master station, and then the UWB wireless time service slave station corrects the standard time information input from the UWB wireless time service master station and inputs the corrected standard time information into the equipment needing time service.
Description
Technical Field
The invention relates to the technical field of time service, in particular to a wireless time service system and a wireless time service method based on UWB.
Background
In many industrial fields, in order to ensure the processing accuracy of a single device and the working synchronization among devices, a device instrument needs to acquire absolute time, and the existing time service technology includes acquiring standard time to calibrate the device after a satellite receiver analyzes a satellite signal, or accessing the device instrument to the network by adopting a wired or wireless network and using the traditional NTP and PTP modes to time the device.
Some devices applied indoors or underground cannot acquire time through satellite signals, a wired network is erected, construction is inconvenient, cost is high, and common network devices cannot meet precision requirements easily. If a wireless network is used, interference is easily received, and the precision is difficult to meet the requirement.
Therefore, there is a need for a UWB-based wireless time service system and a wireless time service method that can achieve relatively smaller cost and size and lower power consumption while ensuring higher accuracy.
Disclosure of Invention
The invention mainly aims to provide a UWB-based wireless time service system and a wireless time service method, which can ensure higher precision and can realize relatively smaller cost and size and lower power consumption.
The invention provides a UWB-based wireless time service system and a UWB-based wireless time service method, wherein the UWB wireless time service system comprises a UWB wireless time service master station, a UWB wireless time service slave station, a device needing time service and a standard time device; the UWB wireless time service master station is connected with the standard time equipment, the UWB wireless time service master station is wirelessly connected with the UWB wireless time service slave station, and the UWB wireless time service slave station is connected with the equipment needing time service; the standard time equipment inputs standard time information into the UWB wireless time service master station, then the UWB wireless time service master station inputs the standard time information into the UWB wireless time service slave station, the UWB wireless time service slave station obtains path delay information between the UWB wireless time service master station and the UWB wireless time service slave station through information interaction with the UWB wireless time service master station, and then the UWB wireless time service slave station corrects the standard time information input from the UWB wireless time service master station through the path delay information and inputs the standard time information into the equipment needing time service.
Preferably, the UWB wireless time service master station comprises a master station PLL circuit, a master station UWB module, a master station UWB antenna and a master station MCU; the standard time equipment converts a 10MHz clock signal into a 38.4MHz clock signal through the master PLL circuit and inputs the clock signal into the master UWB module, the standard time equipment inputs a standard 1PPS signal and serial port information containing standard time information into the master MCU, and the master MCU initializes the master UWB module and transmits a broadcast frame containing current time standard time information through the master UWB module and the master UWB antenna according to the input information.
Preferably, the UWB wireless time service slave station comprises a slave station PLL circuit, a slave station UWB module, a slave station UWB antenna, a slave station MCU and a voltage-controlled clock; the slave station UWB antenna and the slave station UWB module are used for obtaining information transmitted from the UWB wireless time service master station, comparing and correcting the local time of the UWB wireless time service slave station to obtain the standard time of the slave station, outputting a standard 10MHEZ signal to the equipment needing time service through the slave station PLL circuit, and outputting a standard 1PPS signal and the standard time information of the slave station to the equipment needing time service through the slave station MCU.
A wireless time service method is provided,
the UWB wireless time service master station obtains current standard time information from the standard time equipment
；
The UWB wireless time service master station comprises the current standard time information
The broadcast frame of (a) is broadcast by UWB technology;
the UWB wireless time service slave station corrects local time through the received broadcast frame and sends a multiframe back to the UWB wireless time service master station;
the UWB wireless time service master station reads the clock frequency offset of the UWB wireless time service master station and the UWB wireless time service slave station through the reply frame, calculates path delay information, writes the path delay information into a correction frame and sends the correction frame to the corresponding UWB wireless time service slave station;
and the UWB wireless time service slave station corrects the received standard time information according to the path delay information in the correction frame to obtain the slave station standard time information, and sends the slave station standard time information to the time service equipment.
Preferably, the reply frame includes a reception time at which the UWB wireless time service slave station receives a broadcast frame
The transmission time of the reply frame
Time interval of
。
Preferably, after receiving the reply frame, the UWB wireless time service master station calculates the time of transmission from the broadcast frame through the reply frame
Reception time to reception of reply frame
Time interval of
And then reading out the clock frequency offset of the master station and the slave station
Then calculating the path delay information between the primary station and the secondary station by SS-TWR formula
。
Preferably, after receiving the path delay information contained in the correction frame sent by the UWB wireless time service master station, the UWB wireless time service slave station calculates the transmitted standard time information and the path delay to obtain more accurate slave station standard time information, compares the slave station standard time information with the current local time in the UWB wireless time service slave station to calculate a clock error, and corrects the clock error; and the UWB wireless time service slave station calculates clock drift according to the clock error corrected for many times, adjusts the voltage of the voltage-controlled clock according to the clock drift, and outputs the standard time information of the slave station to the equipment needing time service after the time error between the UWB wireless time service slave station and the UWB wireless time service master station is in a sub-ns level.
The UWB-based wireless time service system and the wireless time service method have the beneficial effects that:
1. the device can ensure the stability of signals and relatively higher positioning precision when used indoors and underground.
2. The cost and size are relatively smaller and the power consumption is lower compared to other positioning approaches.
Drawings
FIG. 1 is a schematic structural diagram of a UWB wireless time service master station of a UWB-based wireless time service system and a wireless time service method of the invention.
Fig. 2 is a schematic diagram showing the configuration of a UWB wireless time service slave station in the UWB wireless time service system and the wireless time service method according to the present invention.
FIG. 3 is a timing flow chart of a UWB-based wireless timing system and a wireless timing method according to the present invention.
FIG. 4 is a block diagram illustrating the flow of a UWB wireless time service system and a wireless time service method according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, an embodiment of a UWB-based wireless time service system according to the present invention is proposed:
a UWB-based wireless time service system comprises a UWB wireless time service master station, a UWB wireless time service slave station, a time service device and a standard time device. The UWB wireless time service master station is connected with standard time equipment, the UWB wireless time service master station is in wireless connection with the UWB wireless time service slave station, and the UWB wireless time service slave station is connected with the equipment needing time service.
The UWB wireless time service master station comprises a master station PLL circuit, a master station UWB module, a master station UWB antenna and a master station MCU, a standard time device converts a 10MHz clock signal into a 38.4MHz clock signal through the master station PLL circuit and inputs the clock signal into the master station UWB module, the standard time device inputs a standard 1PPS signal and serial port information containing standard time information into the master station MCU, and the master station MCU initializes the master station UWB module and transmits a broadcast frame containing the standard time information at the moment through the master station UWB module and the master station UWB antenna according to the input information.
The UWB wireless time service slave station comprises a slave station PLL circuit, a slave station UWB module, a slave station UWB antenna, a slave station MCU and a voltage-controlled clock. The slave station UWB antenna and the slave station UWB module acquire information transmitted from the UWB wireless time service master station to compare and correct local time, and the frequency of the voltage-controlled clock is adjusted through voltage to be consistent with the UWB wireless time service master station clock. After clock synchronization is finished, the UWB wireless time service slave station inputs a standard 10MHEZ signal to the equipment needing time service through a slave station PLL circuit, and inputs a standard 1PPS signal and slave station standard time information obtained by correcting a standard time message to the equipment needing time service through a slave station MCU.
Referring to fig. 1, an embodiment of a wireless time service method according to the present invention is provided:
the wireless time service method is based on the UWB-based wireless time service system, and the wireless time service system comprises a UWB wireless time service master station, a UWB wireless time service slave station, a device needing time service and a standard time device. The UWB wireless time service master station is connected with standard time equipment, the UWB wireless time service master station is wirelessly connected with the UWB wireless time service slave station, and the UWB wireless time service slave station is connected with the equipment needing time service.
The UWB wireless time service master station comprises a master station PLL circuit, a master station UWB module, a master station UWB antenna and a master station MCU, and the UWB wireless time service slave station comprises a slave station PLL circuit, a slave station UWB module, a slave station UWB antenna, a slave station MCU and a voltage-controlled clock.
The method comprises the following steps:
1) when the standard time equipment converts the 10MHz clock signal into 38.4MHz through the master station PLL circuitThe clock signal is input into a master station UWB module of a UWB wireless time service master station, and the standard 1PPS signal and the standard time information are contained
The serial port information is input into a master station MCU of the UWB wireless time service master station;
2) the MCU of the master station of the UWB wireless time service master station initializes the UWB module of the master station and transmits standard time information at each interval of time through the UWB module of the master station and the UWB antenna of the master station according to the input information
The broadcast frame of (2);
3) a slave station MCU of a UWB wireless time service slave station within the range initializes a slave station UWB module and waits for receiving a broadcast frame of a master station;
4) after the slave station MCU of the UWB wireless time service slave station receives the broadcast frame, the standard time information is analyzed
And calculates a reception time for receiving the broadcast frame
The transmission time of the reply frame
Time interval of
From the MCU to the station
After the reply frame is written in, transmitting the reply frame to the UWB wireless time service master station at a corresponding time point according to the serial number sequence of the UWB wireless time service slave station;
5) the master station MCU receives a reply frame transmitted by a nearby UWB wireless time service slave station and analyzes the receiving time of the UWB wireless time service slave station receiving the broadcast frame
The transmission time of the reply frame
Time interval of
；
6) Master station MCU calculates broadcast frame transmission
To the receiving moment of receiving the reply frame
Time interval of
And then the clock frequency offsets of the UWB wireless time service master station and the UWB wireless time service slave station are read out
Then, path delay information between the UWB wireless time service master station and the UWB wireless time service slave station is calculated through SS-TWR formula
；
7) The master station MCU is used for wirelessly timing the path delay information of each UWB wireless time service slave station
After all the calculation is finished, the correction frames are packed and written, and are broadcasted to each UWB wireless time service slave station through a master station UWB module;
8) and the slave station MCU of the UWB wireless time service slave station receives the correction frame of the UWB wireless time service master station. Reading the path delay from the UWB wireless time service master station to the UWB wireless time service slave station
And using the path delayMore accurate slave station standard time information is obtained later;
9) the UWB wireless time service slave station compares the standard time information of the slave station with the local time in the UWB wireless time service slave station to calculate a clock difference, and calculates a clock drift through the clock difference, and the UWB wireless time service slave station adjusts the voltage of the voltage-controlled clock according to the clock drift so as to adjust the frequency of the voltage-controlled clock and enable the frequency to be consistent with the clock of the UWB wireless time service master station;
10) and if the error between the local time of the UWB wireless time service slave station and the standard time acquired and corrected by the UWB wireless time service master station is in a sub-ns level, outputting the standard time information of the slave station to the equipment needing time service, otherwise, repeating the steps from 4) to 9) until the error between the local time of the UWB wireless time service slave station and the standard time acquired and corrected by the UWB wireless time service master station is in the sub-ns level, and then outputting the standard time information of the slave station to the equipment needing time service, wherein the specific output mode is that a slave station PLL circuit inputs a standard 10MHEZH signal to the equipment needing time service, and a slave station MCU inputs a standard 1PPS signal and the standard time information of the slave station to the equipment needing time service.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A UWB-based wireless time service system is characterized in that,
the UWB wireless time service system comprises a UWB wireless time service master station, a UWB wireless time service slave station, a device needing time service and a standard time device;
the UWB wireless time service master station is connected with the standard time equipment, the UWB wireless time service master station is wirelessly connected with the UWB wireless time service slave station, and the UWB wireless time service slave station is connected with the equipment needing time service;
the standard time equipment inputs standard time information into the UWB wireless time service master station, then the UWB wireless time service master station inputs the standard time information into the UWB wireless time service slave station, the UWB wireless time service slave station obtains path delay information between the UWB wireless time service master station and the UWB wireless time service slave station through information interaction with the UWB wireless time service master station, and then the UWB wireless time service slave station corrects the standard time information input from the UWB wireless time service master station through the path delay information and inputs the standard time information into the equipment needing time service.
2. The UWB-based wireless time service system of claim 1, wherein the UWB wireless time service master station comprises a master station PLL circuit, a master station UWB module, a master station UWB antenna and a master station MCU; the standard time equipment converts a 10MHz clock signal into a 38.4MHz clock signal through the master PLL circuit and inputs the clock signal into the master UWB module, the standard time equipment inputs a standard 1PPS signal and serial port information containing standard time information into the master MCU, and the master MCU initializes the master UWB module and transmits a broadcast frame containing current time standard time information through the master UWB module and the master UWB antenna according to the input information.
3. The UWB-based wireless time service system according to claim 1, wherein the UWB wireless time service slave station includes a slave PLL circuit, a slave UWB module, a slave UWB antenna, a slave MCU, and a voltage controlled clock; the slave station UWB antenna and the slave station UWB module are used for obtaining information transmitted from the UWB wireless time service master station, comparing and correcting the local time of the UWB wireless time service slave station to obtain the standard time of the slave station, outputting a standard 10MHEZ signal to the equipment needing time service through the slave station PLL circuit, and outputting a standard 1PPS signal and the standard time information of the slave station to the equipment needing time service through the slave station MCU.
4. A wireless time service method based on the UWB based wireless time service system of claim 1,
the UWB wireless time service master station obtains the current standard time information from the standard time equipmentInformation processing device
；
The UWB wireless time service master station comprises the current standard time information
The broadcast frame of (a) is broadcast by UWB technology;
the UWB wireless time service slave station corrects local time through the received broadcast frame and sends a multiframe back to the UWB wireless time service master station;
the UWB wireless time service master station reads the clock frequency offset of the UWB wireless time service master station and the UWB wireless time service slave station through the reply frame, calculates path delay information, writes the path delay information into a correction frame and sends the correction frame to the corresponding UWB wireless time service slave station;
and the UWB wireless time service slave station corrects the received standard time information according to the path delay information in the correction frame to obtain the slave station standard time information, and sends the slave station standard time information to the equipment needing time service.
5. The line timing method according to claim 4, wherein the reply frame includes a reception time at which the UWB wireless timing slave station receives a broadcast frame
The transmission time of the reply frame
Time interval of
。
6. The line timing method of claim 5, wherein the UWB wireless timing master station receives the reply frame and then passes the reply frameSaid reply frame calculating the time of transmission from said broadcast frame
Reception time to reception of reply frame
Time interval of
And then reading out the clock frequency deviation of the master station and the slave station
Then calculating the path delay information between the primary station and the secondary station by SS-TWR formula
。
7. The line timing method of claim 4, wherein said UWB wireless time slave station receives said path delay information contained in a correction frame sent by a UWB wireless time master station, calculates the transmitted standard time information and said path delay to obtain more accurate standard time information of said slave station, compares said standard time information of said slave station with the current local time of said UWB wireless time slave station to calculate a clock offset, and corrects the clock offset; and the UWB wireless time service slave station calculates clock drift according to the clock error corrected for many times, adjusts the voltage of a voltage-controlled clock according to the clock drift, and outputs the standard time information of the slave station to the equipment needing time service after the time error between the UWB wireless time service slave station and the UWB wireless time service master station is in a sub-ns level.
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2022
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Application publication date: 20220805 |