CN116567578B - V2X device and V2X device synchronization method - Google Patents

V2X device and V2X device synchronization method Download PDF

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Publication number
CN116567578B
CN116567578B CN202310814007.6A CN202310814007A CN116567578B CN 116567578 B CN116567578 B CN 116567578B CN 202310814007 A CN202310814007 A CN 202310814007A CN 116567578 B CN116567578 B CN 116567578B
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signal
1pps
module
gps module
gps
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CN116567578A (en
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李国锋
张树民
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Zhidao Network Technology Beijing Co Ltd
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Zhidao Network Technology Beijing Co Ltd
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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
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • 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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

The application discloses V2X equipment and a synchronization method of the V2X equipment, wherein the V2X equipment comprises the following components: the GPS module receives external GPS signals; the 1PPS clock synchronization unit receives a 1PPS signal provided by the GPS module; and the V2X module is used for receiving the processed 1PPS second pulse signal generated by the 1PPS clock synchronization unit and the time and positioning data generated by the GPS module. The application can continuously output relatively accurate time synchronization signals to the V2X module when the GPS synchronization signals are lost in a short period, thereby ensuring the normal communication between V2X devices. The application can be used as a vehicle-mounted OBU device or used for the vehicle-mounted OBU device.

Description

V2X device and V2X device synchronization method
Technical Field
The application relates to the technical field of automatic driving, in particular to V2X equipment and a V2X equipment synchronization method.
Background
The V2X (Vehicle to everything) equipment is used as a necessary communication unit in the field of vehicle-road coordination, and can provide communication among vehicles, roads and clouds. To achieve these basic functions, V2X devices require timing and location information provided by the GPS module. For V2X equipment, a common GPS module is generally adopted, and a typical circuit structure is shown in figure 1. Specifically, when the V2X devices are operating normally, the synchronization signals provided by the GPS need to be relied on, and the synchronization signals can ensure that the V2X devices can transmit and receive communications at the same time steps.
In the related art, when the V2X device is used independently, positioning and time service information provided by an internal common GPS module is generally adopted, but when the V2X device is used as a vehicle-mounted V2X device, when a vehicle is in a region with weak GPS signals (such as a dense tree area or a tunnel, etc.), the internal common GPS module cannot analyze the synchronization signals, so that the vehicle-mounted V2X device cannot work normally and further communication is interrupted.
Disclosure of Invention
The embodiment of the application provides V2X equipment and a V2X equipment synchronization method, so that the V2X equipment can be used as vehicle-mounted OBU (On board Unit) equipment, and the influence of GPS signal abnormality or loss on V2X equipment communication is reduced.
The embodiment of the application adopts the following technical scheme:
in a first aspect, an embodiment of the present application provides a V2X device, where the V2X device includes: a 1PPS clock synchronization unit, a GPS module, a V2X module,
the GPS module is used for receiving external GPS signals;
the 1PPS clock synchronization unit receives a 1PPS signal provided by the GPS module;
and the V2X module is used for receiving the processed 1PPS second pulse signal generated by the 1PPS clock synchronization unit and the time and positioning data generated by the GPS module.
In some embodiments, the 1PPS clock synchronization unit further includes: a Holdover function holding unit,
the Holdover function holding unit is used for synchronously receiving the 1PPS signal output by the GPS module in an initial state; and
and under the condition that the 1PPS signal output by the GPS module is not received, outputting a self-simulation PPS_Simmulate signal, wherein the PPS_Simmulate signal is used as the 1PPS signal during the aging period of the external GPS signal.
In some embodiments, the 1PPS clock synchronization unit further includes: the PPS signal quality monitoring unit is provided with a signal quality monitoring unit,
the PPS signal quality monitoring unit is used for monitoring the quality of the 1PPS signal output by the GPS module; and
and if the quality of the 1PPS signal output by the GPS module is monitored to be not in accordance with the preset condition, outputting a corresponding control signal instruction to generate a 1PPS signal modulation action.
In some embodiments, the 1PPS clock synchronization unit further includes: a switch-and-switch-over unit,
the switch switching unit is used for responding to the control signal instruction and outputting the 1PPS signal output by the GPS module or the PPS_Simmulate signal output by the Holdover function holding unit to the V2X module.
In some embodiments, the 1PPS clock synchronization unit is further configured to
The quality of the 1PPS signal output by the GPS module is monitored in real time;
when the quality of the 1PPS signal output by the GPS module accords with a preset communication condition, outputting a control signal to enable the 1PPS signal output by the GPS module to be directly output to the V2X module;
and when the quality of the 1PPS signal output by the GPS module meets the preset communication condition, generating a 1PPS analog signal and outputting the 1PPS analog signal to the V2X module.
In some embodiments, the GPS module is connected to the 1PPS clock synchronization unit, and is configured to input a 1PPS signal of the external GPS signal to the 1PPS clock synchronization unit, where the 1PPS clock synchronization unit includes:
the first path of signal channel is used for receiving the 1PPS signal in the GPS module and monitoring the quality of the output signal of the GPS module;
a second signal channel for receiving the 1PPS signal in the GPS module and synchronously maintaining the 1PPS signal;
and the third signal channel is used for receiving the 1PPS signal in the GPS module and directly inputting the 1PPS signal into the V2X module.
In some embodiments, after the V2X device is powered up, the pps_en signal in the 1PPS clock synchronization unit is set low by default, and the V2X device is in a normal operating state.
In some embodiments of the present application, in some embodiments,
when the quality of the external GPS signal received by the GPS module meets the requirement, the PPS_EN signal in the 1PPS clock synchronization unit is set to be low level, and meanwhile, the change-over switch is controlled to directly output the 1PPS signal output by the GPS module to the V2X module.
In some embodiments of the present application, in some embodiments,
when the quality of the external GPS signal received by the GPS module is not in accordance with the requirements, the PPS_EN signal in the 1PPS clock synchronization unit is set to be high level from low level, and meanwhile, the change-over switch is controlled to switch and output the analog PPS_Simuline signal to the V2X module, and the external GPS signal quality is not in accordance with at least one of the following: the 1PPS signal quality does not meet stability requirements or the 1PPS signal is not output.
In a second aspect, an embodiment of the present application further provides a synchronization method of a V2X device, where the method is applied to the V2X device in the first aspect, and the method includes:
monitoring and judging the quality of the 1PPS signal output by the GPS module in real time;
if the 1PPS signal quality meets the preset communication condition, directly outputting the 1PPS signal output by the GPS module to a V2X module;
and if the 1PPS signal quality does not meet the preset communication condition or the 1PPS signal is not received, switching and outputting the 1PPS signal analog signal to the V2X module so that the V2X equipment can work normally.
The above at least one technical scheme adopted by the embodiment of the application can achieve the following beneficial effects: the V2X device comprises: the system comprises a 1PPS clock synchronization unit, a GPS module and a V2X module, wherein an external GPS signal is received through the GPS module; and receiving the 1PPS signal provided by the GPS module through the 1PPS clock synchronization unit. And the V2X module can receive the processed 1PPS second pulse signal generated by the 1PPS clock synchronization unit and the time and positioning data generated by the GPS module. When V2X equipment is used as a communication unit of the vehicle-mounted OBU, aiming at the vehicle-mounted OBU equipment, relatively accurate time synchronization signals can still be continuously output to the V2X module when GPS synchronization signals are lost in a short period through an MCU or an FPGA in the OBU, normal communication among the V2X equipment is ensured, and the problem of self signal synchronization when the V2X equipment is used as the vehicle-mounted OBU is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a schematic diagram of a circuit structure of a V2X device in the related art;
FIG. 2 is a schematic diagram of an internal structure of a V2X apparatus according to an embodiment of the present application;
FIG. 3 is a schematic circuit diagram of a V2X device according to an embodiment of the present application;
fig. 4 is a schematic flow chart of a synchronization method of V2X devices in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The following describes in detail the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings.
An embodiment of the present application provides a V2X device, as shown in fig. 2, and provides an internal structural schematic diagram of the V2X device in the embodiment of the present application, where the V2X device 200 includes: the GPS module 220 receives external GPS signals; the 1PPS clock synchronization unit 210 receives the 1PPS signal provided by the GPS module; the V2X module 230 receives the processed 1PPS second pulse signal generated by the 1PPS clock synchronization unit 210 and the time and positioning data generated by the GPS module 220.
In particular, if it is desired that the V2X device 200 be suitable for use in an in-vehicle scenario and be used as a communication device in an in-vehicle OBU device, it is necessary to consider how to maintain normal communication of the V2X device 200 when the GPS synchronization signal is lost for a short period of time. If the original V2X equipment is used independently, an internal GPS module in the V2X equipment receives satellite weak signals through a GPS antenna, and after analysis, positioning and time service information is output to the V2X module. However, if the GPS antenna cannot normally receive the satellite signal, the 1PPS clock synchronization unit 210 needs to be added. Meanwhile, considering that the GPS module 220 is divided into two paths of signals, that is, the NMEA-0183 code stream is generally transmitted in a physical serial port mode for time and positioning data, and the 1pps pulse level signal is transmitted for timing signals. If the vehicle is in a region with weak GPS signals (such as a dense tree area or a tunnel, etc.), the V2X device serving as the vehicle-mounted OBU communication unit can still normally receive and analyze the time and positioning data within a certain time, but cannot analyze the time and positioning data to obtain the 1PPS second pulse signal, so that the 1PPS clock synchronization unit 210 can simulate and generate the 1PPS second pulse signal analog signal within a short time at this time, thereby helping the vehicle OBU to still maintain higher positioning accuracy.
Further, the 1PPS clock synchronization unit 210 needs to receive the 1PPS signal provided by the GPS module. The processed 1PPS second pulse signal generated by the 1PPS clock synchronization unit 210 and the time and positioning data generated by the GPS module 220 may then be received by the V2X module 230. That is, the V2X module 230 receives not only the data generated by the GPS module 220, but also the processed 1PPS second pulse signal, which is combined as complete timing and position information.
It should be noted that, since the NMEA-0183 code stream and the pulse level signal do not belong to the same type of signal, two sets of transmission are required, so that when the synchronization signal in the GPS module is lost in a short period, a relatively accurate (within a certain time) time synchronization signal can still be continuously output to the V2X module, and normal communication between V2X devices is ensured.
In addition, the GPS module 220 still functions to receive external weak GPS signals, and demodulate output timing and positioning signals for use by the V2X module of the V2X device.
By adopting the V2X device, the signal quality of the 1PPS second pulse signal received in the GPS module can be monitored, and corresponding functions can be maintained according to the monitored signal quality. For a user, when the V2X device is used as the vehicle-mounted V2X device, higher time precision and accuracy can be kept in a certain time under the condition that a vehicle runs to a tunnel, an overhead or a dense tree zone is blocked.
Through adopting above-mentioned V2X equipment, mainly in the relevant technique when V2X equipment independently uses, the location and the time service information that adopt inside ordinary GPS module to provide, and when V2X equipment was used as on-vehicle V2X equipment/on-vehicle OBU, when the vehicle was in GPS signal weaker region by oneself, the internal ordinary GPS module that V2X equipment adopted could not parse out synchronous signal to make the unable normal work of V2X equipment and then lead to the problem of communication interruption. In the embodiment of the present application, the processed 1PPS second pulse signal generated by the 1PPS clock synchronization unit 210 is input to the V2X module 230 together with the time and positioning data generated by the GPS module 220, so that the V2X device can work normally within a certain time, and the communication connection of the GPS signal is maintained.
By adopting the V2X device, there is no need to manually pay attention to the signal quality of the GPS module 220, and there is no need to add a corresponding device to the vehicle to determine whether the vehicle carrying the V2X device enters a region with weak GPS signals. Because the 1PPS clock synchronization unit 210 in the V2X device may receive the 1PPS signal provided by the GPS module, and may generate the processed 1PPS second pulse signal according to the monitored quality of the 1PPS second pulse signal, when the GPS synchronization signal is lost in a short period, a relatively accurate time synchronization signal may be continuously output to the V2X module, so as to ensure normal communication between the V2X devices.
In addition, through adopting above-mentioned V2X equipment, circuit design practicality is stronger, through design setting 1PPS signal synchronization keeping element on the hardware, has realized the output signal quality of real-time supervision GPS module and has simulated production 1PPS second pulse signal. The V2X module 230 still adopts a circuit structure in the related art, and may be used as a master control unit (may include a master CPU, and both may be used as a separate IC or an integrated component IC) of the V2X device. The V2X module 230 is mainly used for receiving the parsed GPS signals, i.e. including 1PPS second pulse signals and time and positioning data.
Compared with the prior art, the method is easy to cause the problem of communication interruption of the V2X equipment caused by weak GPS signals, and can better and continuously output relatively accurate time synchronization signals to the V2X module. Meanwhile, the time and positioning data in the GPS module are still used. Therefore, the circuit function of the 1PPS clock synchronization unit of the newly added hardware is simplified, and the whole circuit is more reliable.
In one embodiment of the present application, the 1PPS clock synchronization unit 210 further includes: a Holdover function holding unit (not shown in fig. 2), configured to synchronously receive a 1PPS signal output by the GPS module in an initial state; and under the condition that the 1PPS signal output by the GPS module is not received, outputting a self-simulation PPS_Simmulate signal, wherein the PPS_Simmulate signal is used as the 1PPS signal during the aging period of the external GPS signal.
Referring to fig. 3, the "V2X device motherboard" is provided with the above-mentioned IC of the V2X device, and it is understood that the "V2X device motherboard" is only one possible implementation, and is not limited to the specific structure or components of the V2X device.
With continued reference to fig. 3, the 1PPS clock synchronization unit 210 further includes a Holdover function holding unit, mainly in an initial state, for synchronously receiving the 1PPS signal output by the GPS module, and then outputting a pps_simultaneous signal simulated by itself when the 1PPS signal output by the GPS module is not received. It is understood that the pps_simultaneous signal refers to a 1PPS signal during the aging of the external GPS signal.
Further, the holder function holding unit synchronizes the 1PPS signal output from the GPS module at the initial stage. When the GPS signal is lost due to the shielding of the vehicle-mounted V2X device due to the running environment or other factors and the 1PPS signal of the GPS module is not output, the Holdover function holding unit can continuously output the PPS_Simultaneous signal which is simulated by the Holdover function holding unit.
Meanwhile, the 1PPS signal output by the GPS module is synchronized initially, so that the analog PPS_Simultaneous signal output by the unit can keep higher time precision and accuracy relative to the real 1PPS signal in a short period. It should be noted that "initial synchronization" herein is understood to be synchronization performed when the GPS signal is good, and the synchronization may be periodic or set, and may be selected by those skilled in the art according to the actual use scenario, and is not particularly limited in the embodiment of the present application.
Further, the "initial synchronization" may be used as a backup or anchor, so that the GPS signal is lost due to the shielding of the operating environment or other factors in the V2X device, and the Holdover function holding unit can continuously output the pps_simultaneous signal which is simulated by itself.
In one embodiment of the present application, the 1PPS clock synchronization unit 210 further includes: the PPS signal quality monitoring unit is used for monitoring the quality of the 1PPS signal output by the GPS module; and outputting a corresponding control signal instruction to generate a 1PPS signal modulation action if the quality of the 1PPS signal output by the GPS module is monitored to be not in accordance with a preset condition.
With continued reference to fig. 3, the 1PPS clock synchronization unit 210 further includes the PPS signal quality monitoring unit, which not only can monitor the quality of the 1PPS signal output by the GPS module, but also can output a corresponding control signal instruction to generate a 1PPS signal modulation action if the quality of the 1PPS signal output by the GPS module is monitored to be not in accordance with a preset condition. That is, the 1PPS clock synchronization unit 210 may be used as a "master control" in the V2X device motherboard, and may control the corresponding components to perform the corresponding modulation actions by using the control signals generated by the PPS signal quality monitoring unit.
Further, the PPS signal quality monitoring unit monitors the 1PPS signal quality output by the GPS module, and then judges the working environment of the V2X equipment. When the quality of the input 1PPS signal is degraded (stability is degraded) or lost, a corresponding control signal is output to generate a control action.
In one embodiment of the present application, the 1PPS clock synchronization unit further includes: and the switch switching unit is used for responding to the control signal instruction and outputting the 1PPS signal output by the GPS module or the PPS_Simmulate signal output by the Holdover function holding unit to the V2X module.
With continued reference to fig. 3, the 1PPS clock synchronization unit 210 is a switching unit (not labeled in fig. 3) connected to the PPS signal quality monitoring unit and the PPS signal quality monitoring unit, and is further used to connect one branch of the 1PPS signal output by the GPS module.
Further, for the switch switching unit, according to the control signal command, the 1PPS second pulse signal output by the GPS module or the pps_simultaneous signal of the Holdover function holding unit is output to the V2X module through switching of the circuit branch.
It should be noted that only one available 1PPS second pulse signal is output to the pps_in interface of the V2X module after the switching by the switching unit.
In one embodiment of the present application, the 1PPS clock synchronization unit is further configured to monitor the 1PPS signal quality output by the GPS module in real time; when the quality of the 1PPS signal output by the GPS module accords with a preset communication condition, outputting a control signal to enable the 1PPS signal output by the GPS module to be directly output to the V2X module; and when the quality of the 1PPS signal output by the GPS module meets the preset communication condition, generating a 1PPS analog signal and outputting the 1PPS analog signal to the V2X module.
With continued reference to fig. 3, the operation logic for the 1PPS clock synchronization unit is described as follows:
and a PPS signal quality monitoring unit monitors the 1PPS second pulse signal quality output by the GPS module in real time.
b. When the GPS environment signal is good and the 1PPS second pulse signal quality is high, the control signal is output to enable the 1PPS second pulse signal output by the GPS module to be directly output to the V2X module.
c. When the stability of the 1PPS second pulse signal is detected to be poor or lost, the 1PPS clock synchronization unit considers that the current GPS environment is poor, and the 1PPS clock synchronization unit controls the PPS_Simmulate signal output by the Holdover function maintaining unit to be output to the V2X module.
It may be understood that the 1PPS clock synchronization unit, the switch switching unit, the Holdover function holding unit, and the PPS signal quality monitoring unit are implemented by using an MCU or an FPGA unit at a specific implementation time, which is not specifically limited in the embodiment of the present application.
In one embodiment of the present application, the GPS module is connected to the 1PPS clock synchronization unit, and is configured to input a 1PPS signal of the external GPS signal to the 1PPS clock synchronization unit, and the 1PPS clock synchronization unit includes: the first path of signal channel is used for receiving the 1PPS signal in the GPS module and monitoring the quality of the output signal of the GPS module; a second signal channel for receiving the 1PPS signal in the GPS module and synchronously maintaining the 1PPS signal; and the third signal channel is used for receiving the 1PPS signal in the GPS module and directly inputting the 1PPS signal into the V2X module.
With continued reference to fig. 3, the first signal path is mainly used for receiving the 1PPS signal in the GPS module and for monitoring the output signal quality of the GPS module. And transmits signals in parallel with other signal paths. The second signal channel is mainly used for receiving the 1PPS signal in the GPS module and synchronously maintaining the 1PPS signal, and the third signal channel is mainly used for receiving the 1PPS signal in the GPS module and directly inputting the 1PPS signal to the V2X module. The above-mentioned switching can be realized in particular by means of the switching unit.
In one embodiment of the present application, after the V2X device is powered on, the pps_en signal in the 1PPS clock synchronization unit is set to be low by default, and the V2X device is in a normal operating state.
The 1PPS signal quality monitoring unit monitors and judges the 1PPS signal quality output by the GPS module in real time, and the 1PPS signal quality monitoring unit monitors whether the PPS_EN signal is high or kept low in real time.
In one embodiment of the present application, when the quality of the external GPS signal received by the GPS module meets the requirement, the pps_en signal in the 1PPS clock synchronization unit is set to a low level, and the switch is controlled to directly output the 1PPS signal output by the GPS module to the V2X module.
Referring to fig. 4, the process of implementing the above synchronization mainly includes executing step S410, powering up the system, and running the program. In step S420, the pps_en signal is set low by the PPS signal quality monitoring unit. In step S430, the PPS signal quality monitoring unit monitors and determines the GPS module output signal quality. If so, the process advances to step S440. If not, step S450 is entered.
In the implementation, if the PPS signal quality monitoring unit detects that the 1PPS signal quality is higher, the GPS environment where the V2X device operates is considered to be better, the output pps_en is set to a low level, and the change-over switch is controlled to directly output the 1PPS signal output by the GPS module to the V2X module for use.
The method for realizing the synchronization process specifically comprises the following steps:
in step S440, the GPS output 1PPS signal quality is high.
In step S460, the GPS environment where the V2X device operates is considered to be good.
In step S480, the PPS signal quality monitoring unit sets the output signal pps_en to a low level.
In step S4100, the switch switching unit outputs a 1PPS signal from the GPS module to the V2X module.
In one embodiment of the present application, when the quality of the external GPS signal received by the GPS module is not satisfactory, the pps_en signal in the 1PPS clock synchronization unit is set from a low level to a high level, and the switch is controlled to switch and output the analog pps_simultaneous signal to the V2X module, where the quality of the external GPS signal is not satisfactory at least includes one of the following: the 1PPS signal quality does not meet stability requirements or the 1PPS signal is not output.
When the method is implemented, if the PPS signal quality monitoring unit detects that the 1PPS signal quality is poor or the 1PPS signal is not output, the GPS environment where the V2X equipment works is considered to be poor and communication between the V2X equipment is not facilitated, the output PPS_EN is set to a high level, and the change-over switch is controlled to switch and output the analog PPS_Simuline signal output by the internal hold unit to the V2X module for use; the V2X equipment can work normally.
Referring to fig. 4, the implementation of the above synchronization process specifically includes the following steps:
in step S450, the GPS output 1PPS signal quality is degraded or signal loss is detected.
In step S470, the GPS environment in which the V2X device operates is considered to be degraded.
In step S490, the PPS signal quality monitoring unit sets the output signal pps_en to a high level.
In step S4110, the switch switching unit sends the pps_simultaneous signal output by the Holdover function unit to the V2X module for use.
The embodiment of the application also provides a synchronization method of the V2X equipment, wherein the method is applied to the V2X equipment and comprises the following steps:
s1, monitoring and judging the quality of a 1PPS signal output by a GPS module in real time;
the method comprises the steps of monitoring the quality of 1PPS pulse signals output by a GPS module in real time, and outputting control signals to enable the 1PPS pulse signals output by the GPS module to be directly output to a V2X module when GPS environment signals are good and the quality of the 1PPS signals is high; when the stability of the 1PPS second pulse signal is detected to be poor or the current GPS environment is considered to be poor, the PPS_Simmulate signal output by the hold function maintaining unit is controlled to be output to the V2X module.
S2, if the 1PPS signal quality meets the preset communication condition, directly outputting the 1PPS signal output by the GPS module to a V2X module;
when the quality of the external GPS signal received by the GPS module meets the requirement, the PPS_EN signal in the 1PPS clock synchronization unit is set to be low level, and meanwhile, the change-over switch is controlled to directly output the 1PPS signal output by the GPS module to the V2X module.
And S3, if the 1PPS signal quality does not meet the preset communication condition or the 1PPS signal is not received, switching and outputting the 1PPS signal analog signal to the V2X module so that the V2X equipment can work normally.
When the quality of the external GPS signal received by the GPS module is not in accordance with the requirements, the PPS_EN signal in the 1PPS clock synchronization unit is set to be high level from low level, and meanwhile, the change-over switch is controlled to switch and output the analog PPS_Simuline signal to the V2X module, and the external GPS signal quality is not in accordance with at least one of the following: the 1PPS signal quality is degraded or the 1PPS signal is not output.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.

Claims (3)

1. A V2X device, wherein the V2X device comprises: the V2X device is used for a vehicle-mounted scene and used as communication equipment in a vehicle-mounted OBU device,
the GPS module is used for receiving external GPS signals;
the 1PPS clock synchronization unit receives a 1PPS signal provided by the GPS module;
the V2X module receives the processed 1PPS second pulse signal generated by the 1PPS clock synchronization unit and time and positioning data generated by the GPS module;
the 1PPS clock synchronization unit comprises: a PPS signal quality monitoring unit and a Holdover function holding unit,
the PPS signal quality monitoring unit is used for monitoring the quality of the 1PPS signal output by the GPS module; and if the quality of the 1PPS signal output by the GPS module is monitored to be not in accordance with the preset condition, outputting a corresponding control signal instruction to generate a 1PPS signal modulation action;
the Holdover function holding unit is used for synchronously receiving the 1PPS signal output by the GPS module in an initial state; under the condition that the 1PPS signal output by the GPS module is not received, when the GPS synchronous signal is lost in a short period, a self-simulated PPS_Simmulate signal is output and is input to the V2X module together with time and positioning data generated by the GPS module, wherein the PPS_Simmulate signal is used as the 1PPS signal during the failure period of an external GPS signal;
the GPS module is connected with the 1PPS clock synchronization unit, and is used for inputting the 1PPS signal of the external GPS signal to the 1PPS clock synchronization unit, and the 1PPS clock synchronization unit comprises: the first path of signal channel is used for receiving the 1PPS signal in the GPS module and monitoring the quality of the output signal of the GPS module; a second signal channel for receiving the 1PPS signal in the GPS module and synchronously maintaining the 1PPS signal; the third channel of signal channel is used for receiving the 1PPS signal in the GPS module and directly inputting the 1PPS signal into the V2X module;
after the V2X device is powered on, the PPS_EN signal in the 1PPS clock synchronization unit is defaulted to be low, and the V2X device is in a normal working state;
when the quality of an external GPS signal received by the GPS module meets the requirement, setting a PPS_EN signal in the 1PPS clock synchronization unit to be low level, and simultaneously controlling a switch switching unit in the 1PPS clock synchronization unit to directly output the 1PPS signal output by the GPS module to the V2X module;
when the quality of the external GPS signal received by the GPS module is not in accordance with the requirements, the PPS_EN signal in the 1PPS clock synchronization unit is set to be high level from low level, and meanwhile, the switch switching unit is controlled to switch and output the analog PPS_Simulinte signal to the V2X module, and the external GPS signal quality is not in accordance with the requirements and at least comprises one of the following: the 1PPS signal quality does not meet the stability requirement, and the 1PPS signal is not output.
2. The V2X apparatus of claim 1,
the switch switching unit is used for responding to the control signal instruction and outputting the 1PPS signal output by the GPS module or the PPS_Simmulate signal output by the Holdover function holding unit to the V2X module.
3. A method of V2X device synchronization, wherein applied to a V2X device according to any one of claims 1 to 2, the method comprising:
monitoring and judging the quality of the 1PPS signal output by the GPS module in real time;
if the 1PPS signal quality meets the preset communication condition, directly outputting the 1PPS signal output by the GPS module to a V2X module;
and if the 1PPS signal quality does not meet the preset communication condition or the 1PPS signal is not received, switching and outputting the 1PPS signal analog signal to the V2X module so as to enable the V2X equipment to normally work.
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