CN112511254A - Mobile mother clock based on Beidou positioning time service and LORA communication and time service method - Google Patents
Mobile mother clock based on Beidou positioning time service and LORA communication and time service method Download PDFInfo
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- CN112511254A CN112511254A CN202011298477.4A CN202011298477A CN112511254A CN 112511254 A CN112511254 A CN 112511254A CN 202011298477 A CN202011298477 A CN 202011298477A CN 112511254 A CN112511254 A CN 112511254A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
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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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- Position Fixing By Use Of Radio Waves (AREA)
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Abstract
The invention discloses a mobile mother clock based on Beidou positioning time service and LORA communication, which comprises an MCU master control module, wherein the MCU master control module is respectively connected with an LORA module and the FPGA module through serial ports to obtain data transmitted by an FPGA and the LORA, the LORA module is connected with an LORA antenna through a radio frequency interface to receive and send output position and time data of the MCU module, the FPGA module is simultaneously connected with a Beidou RTD module and a high-stability crystal oscillator, the high-stability crystal oscillator is also connected with the MCU master control module, the Beidou RTD module is also connected with the Beidou antenna to obtain position and time data of the Beidou, the MCU module is provided with NTP, 232 and 485 serial ports, and the mobile mother clock is applied to NTP network time service and serial port time service scenes and is provided with a 1PPS frequency standard output interface. The big dipper time service master clock solves the problems that big dipper time service master clock equipment in the prior art is large in size and cannot carry out accurate positioning and accurate time service.
Description
Technical Field
The invention belongs to the technical field of Beidou positioning time service and LORA communication, and particularly relates to a mobile mother clock based on Beidou positioning time service and LORA communication.
Background
Most big dipper time service mother clock on the market at present passes to the mother clock through big dipper satellite with time signal, then with the time signal processing back that the mother clock received, through 232 serial ports, NTP net gape or 433, 4G, wireless sending such as LORA are given by the time service equipment to realize the mother clock function of giving time service. And the LORA master clock on the market mainly reports the LORA module information in a networking mode through the LORA-WAN, and then sends the LORA module information to the slave equipment through the LORA-WAN, so that the time service function is realized.
The wireless time service master clock cannot be used as a time source to accurately time service other equipment when no Beidou signal exists, LORA-WAN equipment in LORA communication is high in price, and other LORA sub-equipment cannot be normally used after the equipment is damaged; the LORA master clock device using the scheme has large volume, is not easy to miniaturize and integrate, and cannot be carried portably.
Disclosure of Invention
The invention aims to provide a mobile mother clock based on Beidou positioning time service and LORA communication, and solves the problems that Beidou time service mother clock equipment in the prior art is large in size and cannot perform accurate positioning and accurate time service.
The invention adopts a first technical scheme that a mobile master clock based on Beidou positioning time service and LORA communication comprises an MCU master control module, wherein the MCU master control module is respectively connected with an LORA module and the FPGA module through serial ports to obtain data transmitted by an FPGA and an LORA, the LORA module is connected with an LORA antenna through a radio frequency interface to receive and transmit the output position and time data of the MCU module, the FPGA module is also connected with a Beidou RTD module and a high-stability crystal oscillator, the FPGA module transmits the time information modulated and demodulated by the Beidou RTD module to the MCU module through the serial ports, and simultaneously disciplines the high-stability crystal oscillator with 1PPS second pulse demodulated by the RTD module to ensure that the high-stability crystal oscillator outputs 1PPS second pulse with the same phase and frequency as the 1PPS second pulse output by the Beidou RTD module, the high-stability crystal oscillator is also connected with the MCU master control module, when no Beidou signal is covered or the Beidou signal is shielded, the high-crystal oscillator temporarily provides 1 signal for the MCU module, the Beidou RTD module is further connected with a Beidou antenna to acquire Beidou position and time data, the MCU module is provided with NTP, 232 and 485 serial ports and is applied to NTP network time service and serial port time service scenes, and meanwhile, the MCU module is provided with a 1PPS frequency scale output interface.
The first technical aspect of the present invention is also characterized in that,
the MCU main control module is a 32-bit processor based on STM32 series, specifically a processor with the model number of STM32F411, the LORA module is an SX1278/1276 series, and the FPGA module is an XC6SLX9 series of XILINX.
The second technical scheme adopted by the invention is that the time service method of the mobile mother clock based on Beidou positioning time service and LORA communication is implemented according to the following steps:
step 1, a Beidou antenna is used as a signal acquisition end to acquire radio frequency signals transmitted by a Beidou satellite;
step 2, processing a Beidou time and position radio frequency signal received by a Beidou antenna through a Beidou RTD module, modulating and demodulating the signal, and outputting time and position information to an FPGA module through serial port communication;
step 3, the FPGA module transmits the calculated time and position information to the MCU master control module through a serial port, in addition, the FPGA module tamines the high-stability crystal oscillator through the received 1PPS second pulse output by the Beidou RTD module, so that an accurate 1PPS second pulse signal can be still provided for the MCU under the condition that the subsequent short-time Beidou signal coverage is absent or the Beidou signal is shielded, the FPGA module tamines the 1PPS second signal which is modulated and demodulated by the Beidou RTD module and allows the temperature compensation crystal oscillator to output a frequency signal with the same amplitude and phase as the 1 PPS;
step 4, the MCU master control module packages the received time and position signals through algorithm processing, packs the standard time data and position data and transmits the standard time data and the position data to the LORA module through a serial port, and controls the LORA module to autonomously switch the time service mode by detecting whether the FPGA outputs Beidou time and position information;
and 5, transmitting the received accurate time data of the MCU master control module to the equipment needing time service by the LORA module, thereby achieving the purpose of accurate time service of the LORA master clock.
The second technical aspect of the present invention is also characterized in that,
the step 4 is as follows:
MCU host system is through the time service precision to big dipper RTD module, and FPGA's data solution time, LORA data transmission time delay characteristic is drawed and is contrasted, then compensates its time information that will export to reach the purpose of accurate time service, wherein, MCU host system awards the time mode to big dipper RTD module and switches as follows:
when the MCU main control module detects that the FPGA outputs Beidou time and position information normally, the LORA module is closed to not give time to outside;
when the MCU main control module detects that the FPGA outputs Beidou time and position information, the LORA module is opened, and position and time information sent by other LORA master clocks is received.
MCU host system divides into three to big dipper RTD module time service mode switching: respectively as follows: all equipment homoenergetic receive big dipper satellite signal, some equipment can receive big dipper satellite signal, all equipment all can't receive big dipper signal.
The time service mode that all equipment can receive big dipper satellite signal is as follows:
MCU host system judges whether have normal big dipper signal time signal or position signal input, if judge that time signal and the position signal of FPGA module output are normal when, MCU host system passes through serial ports data control LORA module and gets into the low-power consumption mode, LORA module does not initiatively receive and also initiatively outwards sends big dipper time and position information this moment, when needs LORA mother clock realizes the mother clock promptly as the time source and gives time to other equipment, user's accessible resets the button and triggers MCU host system, awaken up LORA module and realize point-to-point time service function.
The time service mode that some equipment can receive big dipper satellite signal is as follows:
to the equipment that does not have big dipper signal input, MCU host system passes through serial data and judges the big dipper time of FPGA module output and when position signal zero hour does not have big dipper signal output promptly, will open the receiving function of LORA module automatically, LORA module transmission function closes this moment, the user can be with the normal LORA mother's clock equipment of signal, trigger MCU host system through the button that resets, awaken up the LORA module and realize point-to-point time service function to the accurate time information of external broadcast.
The time service mode that all equipment can not receive the Beidou signals is as follows:
the user is in all equipment entering when not having big dipper signal area if the culvert, and the tunnel stays big dipper signal normal region as the time source with arbitrary equipment as female clock promptly to trigger MCU host system with equipment through the button that resets, awaken the LORA module and externally broadcast and send accurate time information, combine the remote and high penetrating characteristics of LORA module, realize the purpose that the blind area was time served.
The invention has the advantages that based on the mobile bus of Beidou positioning time service and LORA communication, the size of the module supporting circuit board is reduced through the micropore technology of the circuit board, the integration is convenient, the circuit board is miniaturized and integrated, and the wearable requirement is realized; the time service method of the mobile bus based on Beidou positioning time service and LORA communication removes LORA-WAN through MCU control and combining the communication mode of broadcasting and polling of an LORA module, thereby realizing the self-networking function of the LORA module; realize sheltering from big dipper satellite signal's places at indoor or cave etc. through LORA point-to-point communication, make the time service equipment still can carry out accurate location and accurate time service, improved big dipper signal's application scope.
Drawings
FIG. 1 is a schematic frame diagram of the apparatus;
FIG. 2 is a block diagram of a control scheme;
FIG. 3 is a block diagram of a second control scheme;
fig. 4 is a three-frame diagram of the control method.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a mobile mother clock based on Beidou positioning time service and LORA communication, a structural schematic diagram is shown in figure 1, and the mobile mother clock comprises an MCU master control module, the MCU master control module is respectively connected with an LORA module and the FPGA module through serial ports to obtain data transmitted by an FPGA and an LORA, the LORA module is connected with an LORA antenna through a radio frequency interface to receive and transmit output position and time data of the MCU module, the FPGA module is also connected with a Beidou RTD module and a high-stability crystal oscillator, the FPGA module transmits the time information modulated and demodulated by the Beidou RTD module to the MCU module through the serial ports, and simultaneously disciplines the 1PPS second pulse demodulated by the RTD module to enable the high-stability crystal oscillator to output 1PPS second pulse with the same RTD phase and frequency as the 1PPS second pulse output by the Beidou RTD module, the high-stability crystal oscillator is also connected with the MCU master control module, when no Beidou signal is covered or the Beidou signal is shielded, the high-stability crystal oscillator temporarily provides 1 signal for, the Beidou RTD module is further connected with a Beidou antenna to acquire Beidou position and time data, the MCU module is provided with NTP, 232 and 485 serial ports and is applied to NTP network time service and serial port time service scenes, and meanwhile, the MCU module is provided with a 1PPS frequency scale output interface.
The MCU master control module is a 32-bit processor based on STM32 series, specifically is a processor with the model of STM32F411, the LORA module is based on SX1278/1276 series, and the FPGA module is XC6SLX9 series of XILINX.
The invention relates to a time service method of a mobile mother clock based on Beidou positioning time service and LORA communication, which is implemented according to the following steps:
step 1, a Beidou antenna is used as a signal acquisition end to acquire radio frequency signals transmitted by a Beidou satellite;
step 2, processing a Beidou time and position radio frequency signal received by a Beidou antenna through a Beidou RTD module, modulating and demodulating the signal, and outputting time and position information to an FPGA module through serial port communication;
step 3, the FPGA module transmits the calculated time and position information to the MCU master control module through a serial port, in addition, the FPGA module tamines the high-stability crystal oscillator through the received 1PPS second pulse output by the Beidou RTD module, so that an accurate 1PPS second pulse signal can be still provided for the MCU under the condition that the subsequent short-time Beidou signal coverage is absent or the Beidou signal is shielded, the FPGA module tamines the 1PPS second signal which is modulated and demodulated by the Beidou RTD module and allows the temperature compensation crystal oscillator to output a frequency signal with the same amplitude and phase as the 1 PPS;
step 4, the MCU master control module packages the received time and position signals through algorithm processing, packs the standard time data and position data and transmits the standard time data and the position data to the LORA module through a serial port, and controls the LORA module to autonomously switch the time service mode by detecting whether the FPGA outputs Beidou time and position information;
the step 4 is as follows:
MCU host system is through the time service precision to big dipper RTD module, and FPGA's data solution time, LORA data transmission time delay characteristic is drawed and is contrasted, then compensates its time information that will export to reach the purpose of accurate time service, wherein, MCU host system awards the time mode to big dipper RTD module and switches as follows:
when the MCU main control module detects that the FPGA outputs Beidou time and position information normally, the LORA module is closed to not give time to outside;
when the MCU main control module detects that the FPGA outputs Beidou time and position information, the LORA module is opened, and position and time information sent by other LORA master clocks is received.
MCU host system divides into three to big dipper RTD module time service mode switching: respectively as follows: all equipment homoenergetic receive big dipper satellite signal, some equipment can receive big dipper satellite signal, all equipment all can't receive big dipper signal.
As shown in fig. 2, the time service mode in which all devices can receive the beidou satellite signal is as follows:
MCU host system judges whether have normal big dipper signal time signal or position signal input, if judge that time signal and the position signal of FPGA module output are normal when, MCU host system passes through serial ports data control LORA module and gets into the low-power consumption mode, LORA module does not initiatively receive and also initiatively outwards sends big dipper time and position information this moment, when needs LORA mother clock realizes the mother clock promptly as the time source and gives time to other equipment, user's accessible resets the button and triggers MCU host system, awaken up LORA module and realize point-to-point time service function.
As shown in fig. 3, the time service mode in which some devices can receive the beidou satellite signal is as follows:
to the equipment that does not have big dipper signal input, MCU host system passes through serial data and judges the big dipper time of FPGA module output and when position signal zero hour does not have big dipper signal output promptly, will open the receiving function of LORA module automatically, LORA module transmission function closes this moment, the user can be with the normal LORA mother's clock equipment of signal, trigger MCU host system through the button that resets, awaken up the LORA module and realize point-to-point time service function to the accurate time information of external broadcast.
As shown in fig. 4, the time service mode in which all devices cannot receive the beidou signal is as follows:
the user is in all equipment entering when not having big dipper signal area if the culvert, and the tunnel stays big dipper signal normal region as the time source with arbitrary equipment as female clock promptly to trigger MCU host system with equipment through the button that resets, awaken the LORA module and externally broadcast and send accurate time information, combine the remote and high penetrating characteristics of LORA module, realize the purpose that the blind area was time served.
And 5, transmitting the received accurate time data of the MCU master control module to the equipment needing time service by the LORA module, thereby achieving the purpose of accurate time service of the LORA master clock.
Claims (8)
1. The mobile mother clock based on Beidou positioning time service and LORA communication is characterized by comprising an MCU main control module, wherein the MCU main control module is respectively connected with an LORA module and the FPGA module through serial ports to obtain data transmitted by an FPGA and the LORA, the LORA module is connected with an LORA antenna through a radio frequency interface to receive and transmit output position and time data of the MCU module, the FPGA module is simultaneously connected with a Beidou RTD module and a high-stability crystal oscillator, the FPGA module transmits the time information modulated and demodulated by the Beidou RTD module to the MCU module through the serial ports, and simultaneously tames the 1PPS second pulse demodulated by the RTD module to enable the high-stability crystal oscillator to output 1PPS pulses with the same phase and frequency as the 1PPS pulses output by the Beidou RTD module, the high-stability crystal oscillator is also connected with the MCU main control module, and when no Beidou signal is covered or the Beidou signal is shielded, the high-stability crystal oscillator temporarily provides reliable 1PPS signals for the MCU module, the Beidou RTD module is further connected with a Beidou antenna to acquire Beidou position and time data, the MCU module is provided with NTP, 232 and 485 serial ports and is applied to NTP network time service and serial port time service scenes, and meanwhile, the MCU module is provided with a 1PPS frequency scale output interface.
2. The mobile mother clock based on Beidou positioning time service and LORA communication of claim 1, wherein the MCU master control module is a 32-bit processor based on STM32 series, specifically a processor with the model of STM32F411, the LORA module is based on SX1278/1276 series, and the FPGA module is XC6SLX9 series of XILINX.
3. The time service method of the mobile mother clock based on Beidou positioning time service and LORA communication is characterized by comprising the following steps:
step 1, a Beidou antenna is used as a signal acquisition end to acquire radio frequency signals transmitted by a Beidou satellite;
step 2, processing a Beidou time and position radio frequency signal received by a Beidou antenna through a Beidou RTD module, modulating and demodulating the signal, and outputting time and position information to an FPGA module through serial port communication;
step 3, the FPGA module transmits the calculated time and position information to the MCU master control module through a serial port, in addition, the FPGA module tamines the high-stability crystal oscillator through the received 1PPS second pulse output by the Beidou RTD module, so that an accurate 1PPS second pulse signal can be still provided for the MCU under the condition that the subsequent short-time Beidou signal coverage is absent or the Beidou signal is shielded, the FPGA module tamines the 1PPS second signal which is modulated and demodulated by the Beidou RTD module and allows the temperature compensation crystal oscillator to output a frequency signal with the same amplitude and phase as the 1 PPS;
step 4, the MCU master control module packages the received time and position signals through algorithm processing, packs the standard time data and position data and transmits the standard time data and the position data to the LORA module through a serial port, and controls the LORA module to autonomously switch the time service mode by detecting whether the FPGA outputs Beidou time and position information;
and 5, transmitting the received accurate time data of the MCU master control module to the equipment needing time service by the LORA module, thereby achieving the purpose of accurate time service of the LORA master clock.
4. The time service method of the mobile mother clock based on Beidou positioning time service and LORA communication according to claim 3, wherein the step 4 is as follows:
MCU host system is through the time service precision to big dipper RTD module, and FPGA's data solution time, LORA data transmission time delay characteristic is drawed and is contrasted, then compensates its time information that will export to reach the purpose of accurate time service, wherein, MCU host system awards the time mode to big dipper RTD module and switches as follows:
when the MCU main control module detects that the FPGA outputs Beidou time and position information normally, the LORA module is closed to not give time to outside;
when the MCU main control module detects that the FPGA outputs Beidou time and position information, the LORA module is opened, and position and time information sent by other LORA master clocks is received.
5. The time service method of the mobile mother clock based on Beidou positioning time service and LORA communication according to claim 4, wherein the MCU master control module switches the time service mode of the Beidou RTD module into three types: respectively as follows: all equipment homoenergetic receive big dipper satellite signal, some equipment can receive big dipper satellite signal, all equipment all can't receive big dipper signal.
6. The time service method of the mobile mother clock based on Beidou positioning time service and LORA communication according to claim 5, wherein the time service modes that all the devices can receive Beidou satellite signals are as follows:
MCU host system judges whether have normal big dipper signal time signal or position signal input, if judge that time signal and the position signal of FPGA module output are normal when, MCU host system passes through serial ports data control LORA module and gets into the low-power consumption mode, LORA module does not initiatively receive and also initiatively outwards sends big dipper time and position information this moment, when needs LORA mother clock realizes the mother clock promptly as the time source and gives time to other equipment, user's accessible resets the button and triggers MCU host system, awaken up LORA module and realize point-to-point time service function.
7. The time service method of the mobile mother clock based on Beidou positioning time service and LORA communication according to claim 5, wherein the time service modes of the partial devices capable of receiving Beidou satellite signals are as follows:
to the equipment that does not have big dipper signal input, MCU host system passes through serial data and judges the big dipper time of FPGA module output and when position signal zero hour does not have big dipper signal output promptly, will open the receiving function of LORA module automatically, LORA module transmission function closes this moment, the user can be with the normal LORA mother's clock equipment of signal, trigger MCU host system through the button that resets, awaken up the LORA module and realize point-to-point time service function to the accurate time information of external broadcast.
8. The time service method of the mobile mother clock based on Beidou positioning time service and LORA communication according to claim 5, wherein the time service mode that all devices cannot receive Beidou signals is as follows:
the user is in all equipment entering when not having big dipper signal area if the culvert, and the tunnel stays big dipper signal normal region as the time source with arbitrary equipment as female clock promptly to trigger MCU host system with equipment through the button that resets, awaken the LORA module and externally broadcast and send accurate time information, combine the remote and high penetrating characteristics of LORA module, realize the purpose that the blind area was time served.
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