CN104363069A - Network time system and method based on Beidou satellite positioning - Google Patents
Network time system and method based on Beidou satellite positioning Download PDFInfo
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Abstract
The invention provides a network time system and method based on Beidou satellite positioning. The method includes through accurate time information provided on the basis of a GPS/BD (global positioning system/Beidou) module and combining an internal RTC (real time clock), calculating and correcting time information (year, mouth, date, hour, minute and second); through a TCP/IP (transmission control protocol/internet protocol) network transmission module, establishing a time transmission link with a client side initiating a request on a network in real time; according to the request sent to a server by the client side and through an NTP (network time protocol), synchronizing time with the network client side sending request signals. The network time system and method is higher in network time accuracy and can meet needs of the fields of power communication, communication charging, distributed-type network calculation and weather forecast better.
Description
Technical field
The invention belongs to time calibration in network technical field, particularly relate to a kind of time calibration in network system and method based on big-dipper satellite location.
Background technology
For electrical network, power plant be guaranteed, the equipment operation of transformer station synchronously carries out, must guarantee that device interior clock is consistent.Before Big Dipper electric power the whole network time synchronized management system occurs; in order to unified internal clocking; China's electric power system must provide time signal by the civilian channel of GPS of America to the Electric Power Automation Equipment of electric power system, Computerized monitor system, safety automation proterctive equipment, fault and logout etc., and this makes China's electric power safety be difficult to be protected.
Need the occasion of exact time synchronization at some, as power communication, communication charge, distributed network computing, weather forecast etc., the clock signal only provided by computer itself is far from being enough.According to statistics, computer time and universal time deviation accounted for more than 90% more than 1 minute, this is because the clock signal source of computer is in the simple crystal oscillator carried, and this keeping time property of crystal oscillator is very poor, after adjusting the time, there is the time drift in a few second general every day.
Summary of the invention
The object of the present invention is to provide a kind of time calibration in network system and method based on big-dipper satellite location, be intended to solve the not high problem of existing network time service accuracy.
The present invention is achieved in that a kind of time calibration in network system based on big-dipper satellite location, comprises GPS/BD time calibration in network server, client; Described time calibration in network server comprises: for providing the GPS/BD module of precise time information, RTC clock, TCP/IP network transmission module, EEPROM, and primary processor;
Described primary processor is used for:
Preferably, described client comprises: the precise time information provided based on GPS/BD module, and connecting inner RTC clock, calculate and revise out temporal information (date Hour Minute Second), by TCP/IP network transmission module, in real time and client network being initiated time service request set up time service transmission link;
According to the request that user end to server sends, according to the request that user end to server sends, carry out time service by Network Time Protocol and the networking client sending request signal synchronous;
Wherein, described primary processor is connected with GPS/BD module, RTC clock, network transmission module and EEPROM signal respectively, and described network transmission module is connected with client network.
Portal website's time service terminal, for sending the time service request to portal website to server;
Search and webpage time service terminal, for sending the time service request to search and webpage to server;
Application software time service terminal, for sending the time service request to application software to server;
Wherein, described portal website time service terminal, search and webpage time service terminal and application software time service terminal are connected with network transmission module network respectively.
Invention further provides a kind of time calibration in network method based on big-dipper satellite location, comprise the following steps:
Based on the precise time information that GPS/BD module provides, and connecting inner RTC clock, calculate and revise out temporal information (date Hour Minute Second), by TCP/IP network transmission module, in real time and client network being initiated time service request set up time service transmission link;
According to the request that user end to server sends, according to the request that user end to server sends, carry out time service by Network Time Protocol and the networking client sending request signal synchronous.
Preferably, the request that described user end to server sends specifically comprises: user end to server sends the time service request to portal website, search and webpage and application software.
Compared to the shortcoming and defect of prior art, the present invention has following beneficial effect: time calibration in network accuracy of the present invention is higher, can better meet the needs in power communication, communication charge, distributed network computing, weather forecast field.
Accompanying drawing explanation
Fig. 1 is the structural representation of the time calibration in network system that the present invention is based on big-dipper satellite location;
Fig. 2 is Network Time Protocol operation principle;
Fig. 3 is the message format of NTP;
Fig. 4 is customer end/server mode;
Fig. 5 is peer mode;
Fig. 6 is broadcast mode;
Fig. 7 is multicast pattern;
Fig. 8 is the flow chart of steps of the time calibration in network method that the present invention is based on big-dipper satellite location;
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Based on a time calibration in network system for big-dipper satellite location, as shown in Figure 1, comprise GPS/BD time calibration in network server 1, client 2; Described time calibration in network server 1 comprises: for providing GPS/BD module 11, RTC clock 12, the TCP/IP network transmission module 13, EEPROM14 of precise time information, and primary processor 15;
Described primary processor 15 is for the precise time information that provides based on GPS/BD module 11, and connecting inner RTC clock 12, calculate and revise out temporal information (date Hour Minute Second), by TCP/IP network transmission module 13, in real time and the client 2 network being initiated time service request set up time service transmission link;
According to the request that client 2 sends to server 1, according to the request that user end to server 1 sends, carry out time service by Network Time Protocol and the networking client 2 sending request signal synchronous;
Wherein, described primary processor 15 is connected with GPS/BD module 11, RTC clock 12, network transmission module 13 and EEPROM signal 14 respectively, and described network transmission module 13 is connected with client 2 network.
More specifically, described client 2 comprises:
Portal website's time service terminal 21, for sending the time service request to portal website to time calibration in network server;
Search and webpage time service terminal 22, for sending the time service request to search and webpage to time calibration in network server;
Application software time service terminal 23, for sending the time service request to application software to time calibration in network server;
Wherein, described portal website time service terminal 21, search and webpage time service terminal 22 and application software time service terminal 23 are connected with network transmission module 13 network respectively.
In the present invention, primary processor STM32F103 in time calibration in network synchronization server, based on GPS/BD module 11 (GPS/BD satellite clock, i.e. Big Dipper time service mode) the precise time information that provides, and connecting inner RTC12, calculate and revise out temporal information (date Hour Minute Second), by TCP/IP network transmission module 13, in real time and the client 2 network being initiated time service request set up time service transmission link, build a complete GPS/BD time calibration in network server 1.When client 2 sends request to server 1, server 1 just can the temporal information of synchronously uniform client 2, and reach ms class precision, NTP application layer protocol need be realized during Internet Transmission, pass through in design to construct Network Time Protocol bag and the round-trip delay that can calculate packet switch according to synchronized algorithm.
In the present invention, Big Dipper time service mode is divided into two-way timing and one-way timing, its essential difference is the obtain manner from central station system to subscriber computer propagation delay: the satellite position information of one-way timing system broadcasts according to certain computation model by subscriber computer Autonomic Computing one way propagation time delay, satellite position error, modeling error (Tropospheric Models, ionospheric model etc.) all can affect the estimated accuracy of this time delay, thus affect final timing accuracy; Two-way timing without the need to knowing subscriber computer position and satellite position, by two-way travel time back and forth divided by 2 mode obtain, reflect various deferred message more accurately, therefore its estimated accuracy is higher.The system design values adopting Big Dipper locating module one-way timing precision in dipper system of Xi'an space flight Hua Xun is 100ns, and two-way timing is 20ns, and the performance of actual time service subscriber computer is better than this index usually.
In the present invention, Network Time Protocol (Network Time Protocol, NTP (Network Time Protocol)) is the time synchronization protocol defined by RFC1305, is used for carrying out time synchronized between Distributed Time server and client side.As shown in Figure 2, NTP transmits based on UDP message, and the UDP port number of use is 123.Use the object of NTP to be carry out clock synchronous to the equipment with clock all in network, the clock of all devices in network is consistent, thus enable equipment provide multiple application based on unified time.
For running the local system of NTP, what both can receive from other clock sources is synchronous, again can as clock source other clock synchronous, and can be synchronous mutually with other equipment.
Network Time Protocol operation principle:
The basic functional principle of NTP as shown in Figure 2.Device A is connected by network with Device B, and they have oneself independently system clock, needs the automatic synchronization being realized respective system clock by NTP.For ease of understanding, make the following assumptions:
Before the system clock synchronization of Device A and Device B, the clock setting of Device A is the clock setting of 10:00:00am, Device B is 11:00:00am.
Device B is as NTP time server, and namely Device A is by the clock synchronous of the clock and Device B that make oneself.
The time of NTP message between Device A and Device B required for one-way transmission is 1 second.
As shown in Figure 2, the course of work of system clock synchronization is as follows:
Device A sends a NTP message to Device B, and timestamp when this message leaves Device A with it, this timestamp is 10:00:00am (T1).
When this NTP message arrives Device B, Device B adds oneself timestamp, and this timestamp is 11:00:01am (T2).
When this NTP message leaves Device B, Device B adds oneself timestamp, and this timestamp is 11:00:02am (T3).
When Device A receives this response message, the local zone time of Device A is 10:00:03am (T4).
So far, Device A has had enough information to calculate two important parameters:
Round-trip delay Delay=(T4-T1)-(T3-T2)=2 second of NTP message.
Time difference offset=((T2-T1)+(T3-T4))/2=1 hour of the relative Device B of Device A.
Like this, Device A just can set oneself clock according to these information, make it the clock synchronous with Device B.
The message format of NTP:
NTP has two kinds of dissimilar messages, and one is clock synchronous message, and another kind controls message.Control message only for needing the occasion of network management, it is not required for clock synchronous function, does not introduce here.
As shown in Figure 3, being explained as follows of primary fields:
LI (Leap Indicator): length is 2 bits, is worth and represents alarm status for time " 11 ", and clock is not by synchronously.For NTP itself during other values does not process.
VN (Version Number): length is 3 bits, represent the version number of NTP, current latest edition is 3.
Mode: length is 3 bits, represents the mode of operation of NTP.Implication represented by different values is respectively: 0 undefined, 1 represent that symmetric active peer pattern, 2 represents that symmetric passive peer patterns, 3 represent that user models, 4 represent that server modes, 5 represent that broadcast modes or multicast pattern, 6 represent that these messages are that NTP controls message, 7 and keeps for inner use.
Stratum: the number of plies of system clock, span is 1 ~ 16, it defines the accuracy of clock.The number of plies be 1 clock accuracy the highest, accuracy is successively decreased successively from 1 to 16, the number of plies be 16 clock be in non-synchronous regime, can not as with reference to clock.
Poll: poll time, the time interval namely between two N continuous TP messages.
Precision: the precision of system clock.
Root Delay: the local two-way time to primary reference clock source.
Root Dispersion: system clock is relative to the worst error of primary reference clock.
Reference Identifier: the mark of reference clock source.
Reference Timestamp: the time that system clock is set for the last time or upgrades.
The local zone time of transmitting terminal when Originate Timestamp:NTP request message leaves transmitting terminal.
The local zone time of receiving terminal during Receive Timestamp:NTP request message arrival receiving terminal.
Transmit Timestamp: the local zone time of respondent when response message leaves respondent.
Authenticator: authorization information.
The mode of operation of NTP:
User can select suitable mode of operation as required.Under can not determine and needing the situations such as synchronous equipment is a lot of in server or peer-to-peer IP address, network, clock synchronous can be realized by broadcast or multicast pattern; In client/server and peer mode, equipment obtains clock synchronous from the server of specifying or peer-to-peer, adds the reliability of clock.
Customer end/server mode, as shown in Figure 4, user end to server tranmitting data register sync message, the Mode field in message is set to 3 (user models).Can automatically operate in server mode after server end receives message, and send response message, the Mode field in message is set to 4 (server modes).After client receives response message, carry out clock filtering and selection, and be synchronized to preferred server.
In this mode, client can be synchronized to server, and server cannot be synchronized to client.
Peer mode, as shown in Figure 5, between symmetric active peer and symmetric passive peer, first mutual Mode field is the NTP message of 3 (client modes) and 4 (server modes).Afterwards, symmetric active peer is to symmetric passive peer tranmitting data register sync message, Mode field in message is set to 1 (symmetric active peer), symmetric passive peer automatically operates in symmetric passive peer pattern after receiving message, and sending response message, the Mode field in message is set to 2 (symmetric passive peer).Mutual through message, peer mode is set up.Symmetric active peer and symmetric passive peer can be synchronous mutually.If the clock of both sides synchronously all, is then as the criterion with the clock that the number of plies is little.
Broadcast mode, as shown in Figure 6, server end is periodically to broadcast address 255.255.255.255 tranmitting data register sync message, and the Mode field in message is set to 5 (broadcast modes).Client intercepts the broadcasting packet from server.After client receives first broadcasting packet, client and server interaction Mode field are the NTP message of 3 (user models) and 4 (server modes), to obtain the network delay between client and server.Afterwards, client just enters broadcast client mode, continues the arrival intercepting broadcasting packet, and the broadcasting packet according to arriving carries out synchronously system clock.
Multicast pattern, as shown in Figure 7, server end periodically to user configured multicast address (if user does not configure multicast address, then use the NTP multicast address 224.0.1.1 of acquiescence) tranmitting data register sync message, the Mode field in message is set to 5 (multicast patterns).Client intercepts the multicast message from server.After client receives first multicast message, client and server interaction Mode field are the NTP message of 3 (user models) and 4 (server modes), to obtain the network delay between client and server.Afterwards, client just enters multicast client mode, continues the arrival intercepting multicast message, and the multicast message according to arriving carries out synchronously system clock.
In the present invention, do not limit to the time service terminal type (client) that user adopts, various ways can be adopted to carry out time calibration in network application, time service terminal type can adopt the networked devices such as PC computer, mobile phone, panel computer, carries out long-range connection time service server carry out accurate time service by network mode.Due to employing is standard Network Time Protocol, and hardware device type selecting is specially:
(1) host processor chip: STM32F103ZET6
Based on 32 8-digit microcontrollers of ARM Cortex-M3 core;
512K in-chip FLASH (being equivalent to hard disk), 64K ram in slice (being equivalent to internal memory), in-chip FLASH supports online programming (IAP);
Up to the frequency of 72M;
Support JTAG, SWD debugging. coordinate cheap J-LINK, realize the exploitation debugging plan of high speed low cost;
Nearly 80 IO (most of compatible 5V logic), 4 general purpose timers, 2 senior timers, 2 basic timers, 3 road SPI interfaces, 2 road I2S interfaces, 2 road I2C interfaces, 5 road USART, a USB from equipment interface, a CAN interface, SDIO interface, can 16 BITBUS network-FSMC of compatible SRAM, NOR and NAND Flash interface;
12 AD input of 3 tunnels totally 16 passages, 12 DA of 2 tunnels totally 2 passages export. the outer independent voltage reference of supporting pieces;
CPU operating voltage range: 2.0-3.6V.;
(2) GPS/BD module (HX6412):
HX6412 BD/GPS OEM module is the high-performance integration module of a support Big Dipper (B1) and GPS, the integrated bimodulus baseband chip of veneer and dual-mode radio frequency chip.
Support the high-performance integration module of the Big Dipper (B1) and GPS, the integrated bimodulus baseband chip of veneer and dual-mode radio frequency chip:
Be of a size of 16*12*2.2mm
24PIN Surface Mount stamp encapsulates
Working temperature/storing temperature-40 DEG C to+85 DEG C
Tracking sensitivity-161dBm acquisition sensitivity-147dBm
Horizontal error≤5 meter
Velocity error 0.1m/s
VCC3.2-3.6V
Operating current≤110mA maximum current≤180mA
(3) embedded ethernet serial port module (USR-TCP232-D):
Ethernet serial port module is a part for GPS/BD time calibration in network server hardware, is the modularized hardware part of responsible network transport interface.
Realize TTL and the two-way transparent transmission of wired ethernet;
Support TCP Server, TCP Client, UDP, UDP Server tetra-kinds of patterns;
Serial port baud rate can 1200 ~ 256000 to be arranged arbitrarily;
Support that, by network and serial port setting parameter, parameters arranges rear automatic preservation simultaneously;
Two-way transparent transmission, does special driving without the need to user's serial ports, and upgrading is simple;
Support AUTO MDI/MDIX, crossover network cables or parallel wires can be used to connect;
Duplicate supply interface, 5V or 3.3 power supply;
Compact, powerful, be applicable to embedding application;
Power supply indicator, network connects indicator light, data transmit-receive indicator light;
Supporting upgrade function, without the need to returning factory when having New function requirement or a Bug, only needing to send AKU;
(4) embedded software flow scheme design
Embedded software is developed based on UCOS-II operating system, Network Time Protocol bag, synchronized algorithm are the part in embedded software flow process, and embedded software is exactly mainly based on UCOS-II operating system, when carrying out GPS/BD positioning school, the work such as Network Time Protocol process, and Network Time Protocol process is exactly by Network Time Protocol bag, the round-trip delay of packet switch is calculated, to improve the precision of time calibration in network according to synchronized algorithm.
The present invention further discloses a kind of time calibration in network method based on big-dipper satellite location, comprise the following steps:
Step S1, the precise time information provided based on GPS/BD module, and connecting inner RTC clock, calculate and revise out temporal information (date Hour Minute Second), by TCP/IP network transmission module, in real time and client network being initiated time service request set up time service transmission link;
Step S2, the request sent according to user end to server, according to the request that user end to server sends, carry out time service by Network Time Protocol and the networking client sending request signal synchronous.
The request that described user end to server sends specifically comprises: user end to server sends the time service request to portal website, search and webpage and application software.
Embodiment of the present invention method is corresponding with system in above-described embodiment, with above-mentioned system embodiment contents equally for explaining this method embodiment, does not repeat them here.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1., based on a time calibration in network system for big-dipper satellite location, it is characterized in that, comprise GPS/BD time calibration in network server, client; Described time calibration in network server comprises: for providing the GPS/BD module of precise time information, RTC clock, TCP/IP network transmission module, EEPROM, and primary processor;
Described primary processor is connected with GPS/BD module, RTC clock, network transmission module and EEPROM signal respectively, and described network transmission module is connected with client network;
Wherein, the precise time information that described primary processor provides based on GPS/BD module, and connecting inner RTC clock, calculate and revise out temporal information, by TCP/IP network transmission module, in real time and client network being initiated time service request set up time service transmission link; The request that described primary processor sends according to user end to server, carries out time service by Network Time Protocol and the networking client sending request signal synchronous.
2., as claimed in claim 1 based on the time calibration in network system of big-dipper satellite location, it is characterized in that, described client comprises:
Portal website's time service terminal, for sending the time service request to portal website to time calibration in network server;
Search and webpage time service terminal, for sending the time service request to search and webpage to time calibration in network server;
Application software time service terminal, for sending the time service request to application software to time calibration in network server.
3., based on a time calibration in network method for big-dipper satellite location, it is characterized in that, comprise the following steps:
Based on the precise time information that GPS/BD module provides, and connecting inner RTC clock, calculate and revise out temporal information (date Hour Minute Second), by TCP/IP network transmission module, in real time and client network being initiated time service request set up time service transmission link;
According to the request that user end to server sends, according to the request that user end to server sends, carry out time service by Network Time Protocol and the networking client sending request signal synchronous.
4. as claimed in claim 3 based on the time calibration in network method of big-dipper satellite location, it is characterized in that, the request that described user end to server sends specifically comprises: user end to server sends the time service request to portal website, search and webpage and application software.
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| CN104753945A (en) * | 2015-03-31 | 2015-07-01 | 上海斐讯数据通信技术有限公司 | Network time synchronizing system and method |
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| CN105187148A (en) * | 2015-08-17 | 2015-12-23 | 武汉理工大学 | ARM-based network clock synchronization system and method |
| CN105187148B (en) * | 2015-08-17 | 2017-12-08 | 武汉理工大学 | A kind of network clock synchronization system and method based on ARM |
| CN107181555A (en) * | 2017-07-17 | 2017-09-19 | 潍坊安盾软件科技有限公司 | Using the Network Time Protocol of extension the method that internet is interacted with equipment in LAN is realized instead of DDNS |
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| CN109031938A (en) * | 2018-08-21 | 2018-12-18 | 苏州金瑞阳信息科技有限责任公司 | A kind of satellite time transfer clock system for examination hall |
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| CN109814370A (en) * | 2019-01-30 | 2019-05-28 | 深圳国人通信股份有限公司 | A kind of clock system |
| CN110034840A (en) * | 2019-04-23 | 2019-07-19 | 江苏星网软件有限公司 | A kind of network clock synchronous device and system |
| CN110738017A (en) * | 2019-09-24 | 2020-01-31 | 深圳探科技术有限公司 | Distributed integrated circuit simulation method and device, computing equipment and storage medium |
| CN110673466A (en) * | 2019-10-18 | 2020-01-10 | 济南启天电子有限公司 | Time server |
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| CN114157380A (en) * | 2021-12-02 | 2022-03-08 | 浪潮云信息技术股份公司 | ZNBASE distributed database clock synchronization method and system |
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