CN113176591A - Time synchronization method and device of monitoring platform, electronic equipment and storage medium - Google Patents
Time synchronization method and device of monitoring platform, electronic equipment and storage medium Download PDFInfo
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- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
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Abstract
The embodiment of the invention discloses a time synchronization method and device of a monitoring platform, electronic equipment and a storage medium. The time synchronization method of the monitoring platform comprises the following steps: determining the credibility of candidate cameras configured with a satellite positioning module on a monitoring platform; the satellite positioning module is used for acquiring satellite time service; determining a target camera according to the reliability; and carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera. According to the embodiment of the invention, the time synchronization is carried out through the cameras which are registered on the monitoring platform and are provided with the satellite positioning modules, and no additional server is required to be deployed and subsequent maintenance is required, so that the time synchronization efficiency is improved; meanwhile, time synchronization is carried out by adopting satellite time service time, the accuracy of time synchronization of the monitoring platform is ensured, and the problem of time error caused by inaccurate local clock source to the monitoring platform is solved.
Description
Technical Field
The embodiment of the invention relates to the technical field of time synchronization, in particular to a time synchronization method and device of a monitoring platform, electronic equipment and a storage medium.
Background
In the network communication process, the time synchronization between the devices is very important, and if the time is not synchronized, the communication is disordered, and even the system is abnormal and paralyzed. Especially, in a security monitoring system, time synchronization is important, and if the time of each monitoring camera in the security monitoring system is not synchronous, a monitoring data error is caused, and monitoring quality is affected.
At present, two schemes adopted for Time synchronization include that firstly, a professional NTP (network Time protocol) server is used, and the server is usually provided with a satellite synchronization system, so that accurate Time synchronization can be realized, for example, Time on a mobile phone and a computer is mostly synchronized through a network NTP server. The other scheme is to designate a certain server as a clock source, namely, a local clock source is adopted for timing synchronization.
However, in the monitoring industry, due to safety considerations, the server is generally arranged in an intranet, the server cannot be connected with the internet to perform network NTP time synchronization, and a professional commercial NTP server is expensive and needs to deploy an external antenna, so that the deployment and the later maintenance are complicated. The local server is inaccurate in crystal oscillator and large in error, the maximum deviation of one day can reach the level of second by adopting the local server as a clock source, and if the local server needs to run for a long time and needs to be continuously calibrated, the time synchronization efficiency is low.
Disclosure of Invention
The embodiment of the invention provides a time synchronization method and device for a monitoring platform, electronic equipment and a storage medium, which improve the accuracy of time synchronization of the monitoring platform, do not need additional deployment and maintenance and improve the synchronization efficiency.
In a first aspect, an embodiment of the present invention provides a time synchronization method for a monitoring platform, including:
determining the credibility of candidate cameras configured with a satellite positioning module on a monitoring platform; the satellite positioning module is used for acquiring satellite time service;
determining a target camera according to the reliability;
and carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera.
In a second aspect, an embodiment of the present invention further provides a time synchronization apparatus for a monitoring platform, including:
the reliability determining module is used for determining the reliability of candidate cameras which are provided with the satellite positioning module on the monitoring platform; the satellite positioning module is used for acquiring satellite time service;
the target camera determining module is used for determining a target camera according to the reliability;
and the time synchronization module is used for carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera.
In a third aspect, an embodiment of the present invention further provides an electronic device, including:
one or more processors;
a storage device for storing one or more programs,
when the one or more programs are executed by the one or more processors, the one or more processors implement the time synchronization method of the monitoring platform according to any embodiment of the invention.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a time synchronization method for a monitoring platform according to any embodiment of the present invention.
The method comprises the steps of determining the reliability of a candidate camera provided with a satellite positioning module on a monitoring platform; the satellite positioning module is used for acquiring satellite time service; determining a target camera according to the reliability; and carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera. According to the embodiment of the invention, the time synchronization is carried out through the cameras which are registered on the monitoring platform and are provided with the satellite positioning modules, and no additional server is required to be deployed and subsequent maintenance is required, so that the time synchronization efficiency is improved; meanwhile, time synchronization is carried out by adopting satellite time service time, the accuracy of time synchronization of the monitoring platform is ensured, and the problem of time error caused by inaccurate local clock source to the monitoring platform is solved.
Drawings
Fig. 1 is a flowchart of a time synchronization method of a monitoring platform according to a first embodiment of the present invention;
FIG. 2 is a flowchart of a method for time synchronization of a monitoring platform according to a second embodiment of the present invention;
fig. 3 is a flowchart of a time synchronization method of a monitoring platform according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a time synchronizer of a monitoring platform according to a fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device in a fifth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a time synchronization method for a monitoring platform according to a first embodiment of the present invention, which is applicable to a case of synchronizing time on the monitoring platform. The method may be performed by a time synchronization apparatus of a monitoring platform, which may be implemented in software and/or hardware and may be configured in the monitoring platform, for example, the monitoring platform may be a device with communication and computing capabilities, such as a background server. As shown in fig. 1, the method specifically includes:
The candidate camera refers to a monitoring image acquisition device registered on the monitoring platform. The satellite positioning module is a module configured on a camera so that the camera can be in communication connection with a satellite to acquire positioning information. For example, the satellite positioning modules are configured with a satellite navigation system, such as a beidou satellite navigation system or a GPS satellite navigation system, and different systems are used for connecting with corresponding satellites, for example, each positioning module may be connected with at least one satellite. The satellite time service time refers to international standard time provided by a satellite navigation system, and the time synchronization can ensure the accuracy of time setting on the monitoring platform. The monitoring platform is used for managing all the registered cameras and managing the monitoring images shot by the cameras, so that the accuracy of time synchronization on the monitoring platform is of great importance to the setting accuracy of the time of the monitoring images on the platform. The credibility of the candidate camera is used for representing the reliability and stability of the satellite time service acquired from the satellite positioning module in the camera, because the candidate camera is provided with the satellite positioning module, interference caused by other external factors such as satellite signals and network signals can cause interference to the candidate camera in acquiring the satellite time service, and therefore the credibility is introduced for representing. Further, the confidence level may be determined based on the satellite signals and the network signals of each candidate camera.
Specifically, when the camera registers on the monitoring platform, registration information occurs on the monitoring platform, and the registration information carries a mark field for marking whether the camera is configured with a satellite positioning module. After identifying the candidate camera configured with the satellite positioning module, the monitoring platform marks the candidate camera, and can be used as a candidate clock source for time synchronization. And the monitoring platform determines the credibility of each camera according to the satellite signals of the candidate camera positions configured with the satellite positioning module and the network signals.
Illustratively, the monitoring platform recognizes that a camera registered on line carries a satellite positioning module, adds coding information, a name, an IP address and an online state of the camera to a database for recording, and marks the initial credibility of the camera as 0. And after the addition of all candidate cameras configured with the satellite positioning module is finished, determining the reliability according to the satellite signals and the network signals of all the cameras. After a new candidate camera configured with the satellite positioning module is added to the monitoring platform, reliability of all candidate cameras configured with the satellite positioning module needs to be updated.
In one possible embodiment, the confidence level of the candidate camera is determined based on at least one of: satellite signal anti-interference capability, network stability and equipment stability of the candidate cameras;
wherein the satellite signal anti-interference capability is determined according to at least one of the following: the set position of the machine position, the building density around the machine position, the height of the machine position, the weather and the number of the cameras connected with the satellites; the network stability is determined according to the networking mode and/or the network detection data; the stability of the equipment is determined according to the self-stable operation time of the camera.
The satellite signal anti-interference capability is used for representing the receiving strength of the satellite signal connected with the camera, namely representing the stability of the data received by the camera from the connected satellite; the network stability is used for representing the signal strength of data transmitted by the camera, namely representing the data transmission stability between the camera and the monitoring platform; the equipment stability refers to the stability of the operation of the camera itself.
Specifically, the confidence score S1 of the anti-interference capability of the satellite signal is calculated according to at least one of the following items: the set position of the machine position, the building density around the machine position, the height of the machine position, the weather and the number of the cameras connected with the satellites; determining a reliability score of the network stability according to the networking mode and/or the network detection data S2; and determining the reliability score of the stability of the equipment according to the self-stable running time of the camera S3. And finally, the credibility score S of each candidate camera is determined according to the credibility score S1 of the anti-interference capability of the satellite signal, the credibility score S2 of the network stability and the credibility score S3 of the equipment stability. For example, S is w1 × S1+ w2 × S2+ w3 × S3, where w1, w2, and w3 are weight values of influences of satellite signal anti-interference capability, network stability, and device stability on camera reliability, and specific values may be set according to actual situations, which is not limited herein.
The reliability score of the satellite signal anti-interference capability is influenced by the set position of the airplane, the building density around the airplane, the height of the airplane, the weather and the number of the cameras connected with the satellites. The position setting position means that the camera is arranged indoors or outdoors, and because the satellite signals in the room can be seriously damaged, the satellite signal anti-interference capability of the candidate camera arranged indoors is smaller than that of the candidate camera arranged outdoors. Specifically, if the candidate camera is arranged indoors, the credibility is deducted according to a preset score; if the mobile terminal is arranged outdoors, the credibility is added according to the preset score. The building density around the airport is the density of buildings around the camera, and the higher the building density is, the stronger the interference to the satellite signal is. Specifically, if the building density around the machine position is greater than a preset density threshold value, the credibility is deducted according to a preset score; otherwise, the credibility is added according to the preset score. Optionally, a mapping relationship between the building density around the airplane space and the reliability of the item is pre-established, and a reliability score of mapping is determined according to the building density around the airplane space of the candidate camera, and is used as the reliability of the item. The height of the machine position refers to the setting height of the camera, and the lower the machine position is, the weaker the satellite signal receiving capability is. Specifically, if the height of the machine position is smaller than a preset height threshold, the credibility is deducted according to a preset score; otherwise, the credibility is added according to the preset score. Optionally, a mapping relationship between the airplane space height and the reliability of the item is pre-established, and a reliability score of the mapping is determined according to the airplane space height of the candidate camera and is used as the reliability of the item. Weather refers to information of proportion of real-time weather or good weather of the whole year of the place where the airplane is located, severe weather such as rain and snow can interfere satellite signals, and the satellite in fine weather receives signals well. Specifically, if the real-time weather is severe weather or the proportion of good weather in the whole year of the place where the aircraft is located is lower than a preset weather proportion threshold, the credibility is deducted according to a preset score; otherwise, the credibility is added according to the preset score. The number of the satellites connected with the camera refers to the number of the satellites connected with the satellite positioning module of the camera, and the larger the number of the connected satellites is, the stronger the anti-interference capability of receiving satellite signals is. Specifically, a mapping relation between the number of connected satellites and the reliability of the item is established in advance, and a reliability score of mapping is determined according to the number of camera connected satellites of the candidate camera and is used as the reliability of the item. Optionally, if the number of the connected satellites of the camera is less than three, and the satellite signal receiving anti-interference capability of the camera is poor, the credibility is deducted according to the preset fraction. And determining the credibility score of the anti-interference capability of the satellite signal according to the set position of the airplane position, the density of buildings around the airplane position, the height of the airplane position, the weather and the sum of the credibility scores of the satellite number connected with the camera.
The confidence score for network stability is affected by the networking mode and/or network detection data. The networking mode refers to a network connection mode between the camera and the monitoring platform, and comprises wired connection and wireless connection. Since the wireless connection is unstable, disconnection easily occurs, resulting in high data transmission delay. Specifically, if the networking mode is wireless connection, the credibility is deducted according to a preset score; if the connection is wired, the credibility is added according to a preset score. The network monitoring data is used for representing the communication condition of the network, for example, the network monitoring data includes network monitoring performed on the camera, and obtained packet loss rate, average delay data and the like. The higher the packet loss rate and the average delay data, the worse the network from the camera to the monitoring platform. Specifically, if the network detection data is higher than a preset network threshold, the credibility is deducted according to a preset score; otherwise, the credibility is added according to the preset score. Optionally, a mapping relationship between the network detection data and the reliability of the item is established in advance, and a reliability score of the mapping is determined according to the network detection data of the candidate camera and is used as the reliability of the item. And determining the credibility score of the network stability according to the networking mode and/or the credibility score of each item of the network detection data.
The reliability score for the stability of the device is influenced by the self-stability operation time of the camera. The self-stable operation time length of the camera refers to the current duration time length of the camera for keeping the system to normally operate. The longer the stable running time of the camera is, the more stable the environment of the camera is. Specifically, if the self-stable operation time of the camera is less than a preset time threshold, the credibility is deducted according to a preset score; otherwise, the credibility is added according to the preset score. Optionally, a mapping relationship between the self-stable operation time length and the reliability is pre-established, and a reliability score of the mapping is determined according to the self-stable operation time length of the candidate camera, and is used as the reliability of the equipment stability.
And 102, determining a target camera according to the reliability.
Because the reliability represents the reliability and stability of the satellite time service time obtained from the satellite positioning module in the camera, the method for determining the reliability can obtain the following results: the higher the confidence level, the more reliable the satellite time service obtained from the candidate camera. Therefore, the candidate cameras are ranked according to the degree of reliability, and the candidate camera with the highest reliability is the target camera and can be used as the master clock source.
In one possible embodiment, after determining the target camera according to the degree of confidence, the method further comprises:
judging whether the credibility of the target camera is smaller than a preset credibility threshold value or not;
if yes, a local clock source is adopted;
if not, executing: and carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera.
And determining a candidate camera with the highest reliability as a target camera, wherein the candidate camera only can show that the target camera has the highest reliability in the current environment, and cannot show that the satellite time service time acquired by the target camera is taken as the reliability of the synchronization time. Therefore, before time synchronization, the reliability of the target camera is judged according to the preset reliability threshold value. The preset reliability threshold is used to characterize the lowest reliability of the target camera as the time-synchronized clock source, and the specific value of the preset reliability threshold is set according to the actual situation, for example, determined according to a reliability determination method, which is not limited herein. For example, the preset confidence level threshold is set based on empirical values.
Specifically, after the target camera is determined according to the magnitude of the reliability, that is, before time synchronization is performed according to the target camera, it is determined whether the reliability of the target camera is smaller than a preset reliability threshold, if so, it indicates that the target camera still does not meet the requirement of a clock source for performing time synchronization, and the monitoring platform cancels clock source synchronization and continues to use a local clock source. And if the credibility of the target camera is greater than or equal to the preset credibility threshold, indicating that the target camera meets the requirement of serving as a clock source for time synchronization. Step 103 is executed for time synchronization. Optionally, if the credibility of the target camera is less than the preset credibility threshold, the credibility of the target camera is monitored while the local clock source is continuously used, and if the credibility of the target camera is changed, the threshold judgment is started again. Optionally, if the credibility of the target camera is less than the preset credibility threshold, the credibility of the candidate camera on the monitoring platform is periodically updated and judged while the local clock source is continuously used, and whether a target camera with the credibility greater than the preset credibility threshold exists is determined.
And 103, carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera.
After the target camera is determined to be used as a time synchronization clock source, the monitoring platform acquires satellite time service time from the target camera satellite positioning module, and the time on the monitoring platform is synchronized according to the satellite time service time. Specifically, after the satellite time service time is received, the system time of the monitoring platform is changed into the satellite time service time, and time synchronization is completed.
In one possible embodiment, step 103 includes:
acquiring satellite time service sent by a target camera;
determining delay compensation time according to transmission delay between a monitoring platform and a target camera;
and determining the synchronous time according to the satellite time service time and the compensation time.
After the satellite time service time is acquired by the target camera, the satellite time service time needs to be transmitted to the monitoring platform through a network, data transmission from the camera to the monitoring platform can bring certain time delay, and if the monitoring platform takes the directly received satellite time service time as system synchronization time, the acquisition of a clock source can be inaccurate. Therefore, before time synchronization, synchronization calibration is performed after delay compensation is performed on the acquired satellite time service time, so as to ensure that errors caused by transmission delay are eliminated and improve the accuracy of time synchronization.
Specifically, the monitoring platform determines the transmission time for transmitting the satellite time service from the target camera to the monitoring platform while acquiring the satellite time service from the target camera, and the transmission time is used as the delay compensation time, and after the monitoring platform acquires the satellite time service, the delay compensation time is compensated in the satellite time service and used as the system time of the monitoring platform, so that the time synchronization is completed.
In one possible embodiment, determining the delay compensation time according to the transmission delay between the monitoring platform and the target camera includes:
sending a time acquisition request to a target camera, and determining the sending time of the time acquisition request;
receiving response information which is sent by a target camera according to a time acquisition request and carries satellite time service time, and determining the receiving time of the response information;
and determining the delay compensation time according to the sending time and the receiving time.
After determining the target camera, the monitoring platform sends a time acquisition request to the target camera, and the time acquisition request is used for indicating the target camera to acquire satellite time service and sending the satellite time service to the monitoring platform. When the monitoring platform sends the time acquisition request to the target camera, the sending time t1 of the time acquisition request is determined. Illustratively, the monitoring platform sends an ICMP packet to the target camera while recording the sending time t 1.
After receiving the time acquisition request, the target camera acquires satellite time t0 through the satellite positioning module, generates response information carrying the satellite time and sends the response information to the monitoring platform. After receiving the response information, the monitoring platform acquires satellite time service time from the response information, and determines the receiving time t2 of the response time. Illustratively, on the basis of the above example, after the target camera receives the ICMP packet, payload is added to the original message, the original message carries the satellite time service acquired by the target camera, and then the message is returned to the monitoring platform, and after the monitoring platform receives the returned message packet, the receiving time t2 of the received message packet is recorded.
According to the fact that the time length between the sending time t1 and the receiving time t2 is the consumed time length of the message transmitted from the monitoring platform to the target camera and then transmitted from the target camera to the monitoring platform, the consumed time of transmitting data from the target camera to the monitoring platform can be determined according to the sending time and the receiving time. Exemplary, time consuming transfer of data from the target camera to the monitoring platform, i.e., delay compensation time
And compensating the delay consumed time to obtain the compensated synchronization time ST of t0+ theta.
And the monitoring platform changes the current system time into ST when receiving the satellite time service and determining the time delay compensation time, thereby completing the time delay compensation and time synchronization. The network detection is carried out on the target camera serving as the clock source, secondary time calibration compensation is carried out according to network delay, and the time accuracy of the clock source is improved.
The method comprises the steps of determining the reliability of a candidate camera provided with a satellite positioning module on a monitoring platform; the satellite positioning module is used for acquiring satellite time service; determining a target camera according to the reliability; and carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera. According to the embodiment of the invention, the time synchronization is carried out through the cameras which are registered on the monitoring platform and are provided with the satellite positioning modules, and no additional server is required to be deployed and subsequent maintenance is required, so that the time synchronization efficiency is improved; meanwhile, time synchronization is carried out by adopting satellite time service time, the accuracy of time synchronization of the monitoring platform is ensured, and the problem of time error caused by inaccurate local clock source to the monitoring platform is solved.
Example two
Fig. 2 is a flowchart of a time synchronization method for a monitoring platform according to a second embodiment of the present invention, where the second embodiment is further optimized based on the first embodiment, and is used after performing time synchronization on the monitoring platform according to satellite time service time acquired by a satellite positioning module in a target camera, as shown in fig. 2, the method includes:
and step 201, if the preset time interval is reached, updating the credibility of the candidate camera on the monitoring platform to obtain the updated credibility of the candidate camera.
After the system time of the monitoring platform is synchronized according to the satellite time service time of the target camera, the local clock is continuously used for timing, and errors are continuously accumulated in the subsequent timing process, so that the time synchronization needs to be periodically performed to eliminate errors caused by the timing of the local clock source. The preset time interval represents a period length required for time synchronization, and the specific value may be set according to an actual situation, which is not limited herein.
Specifically, timing is started after time synchronization is performed once, and if the time length from the last time of time synchronization reaches a preset time interval, the next time of time synchronization is started. That is, after the preset time interval is reached, the credibility of the candidate camera currently configured with the satellite positioning module on the monitoring platform needs to be re-determined to obtain the updated credibility of each candidate camera, and the method for determining the credibility may refer to embodiment one, and is not described herein again. When time synchronization is performed again, the reliability of the target camera determined last time may change, or a candidate camera newly registered online appears, so that the reliability of the candidate camera needs to be updated again to ensure the accuracy of subsequent time synchronization.
And re-determining a new target camera according to the updated credibility, wherein the re-determined target camera may or may not be the last time-synchronized target camera.
And step 203, performing time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the redetermined target camera.
And acquiring the time of the primary satellite again according to the satellite positioning module in the re-determined target camera, and then performing time synchronization on the monitoring platform according to the new time of the satellite. Even if the redetermined target camera is the last time-synchronized target camera, a new satellite time service time still needs to be acquired through the target camera again so as to ensure that errors caused by timing of a local clock source are eliminated.
According to the embodiment of the invention, the time on the monitoring platform is synchronized by periodically acquiring the satellite time service time with high credibility, so that the problem of accumulated error caused by timing of a local clock source is solved, and the accuracy of the system time on the monitoring platform is improved.
EXAMPLE III
Fig. 3 is a flowchart of a time synchronization method for a monitoring platform according to a third embodiment of the present invention, where the second embodiment is further optimized based on the first embodiment, and is used after performing time synchronization on the monitoring platform according to satellite time service time acquired by a satellite positioning module in a target camera, as shown in fig. 3, the method includes:
and 301, if the preset time interval is reached, updating and judging the online state and the credibility of the target camera.
In order to eliminate errors caused by a local clock source, the system time on a monitoring platform needs to be periodically synchronized, in order to improve the synchronization efficiency, and avoid the need of updating the credibility of all candidate cameras during each synchronization, in the embodiment of the invention, a priority determination scheme for performing health check on a target camera during the periodic synchronization is provided. When the time of the monitoring platform needs to be resynchronized, firstly, whether a target camera which is synchronized last time is still credible is determined, and if the target camera is still credible, the camera is still adopted as a new round of target camera with time synchronization; and if the target camera is not credible, updating the credibility of the candidate camera on the monitoring platform, and determining a new target camera again according to the updated credibility.
Specifically, timing is started after time synchronization is performed once, and if the time length from the last time of time synchronization reaches a preset time interval, the next time of time synchronization is started. After the preset time interval is reached, health check is needed to be carried out on the target camera determined in the previous round, wherein the health check comprises online state check and credibility updating check, and whether the target camera needs to be determined again is determined according to the result of the health check.
And 302, if the target camera is in an online state and the updated reliability is greater than or equal to a preset reliability threshold, not updating the target camera.
If the health check result of the target camera is as follows: and if the current credibility after updating is larger than or equal to the preset credibility threshold, the target camera is still credible and can still be used as a new round of time synchronization target camera.
And 303, if the target camera is in an off-line state or the updated reliability is less than a preset reliability threshold, re-determining the target camera according to the updated reliability of the candidate camera on the monitoring platform.
If the health check result of the target camera is as follows: and if the target camera is in an off-line state or the updated current credibility is smaller than the preset credibility threshold, the target camera in the previous round is not credible and cannot be used as a target camera in a new round, and a process of re-determining the target camera is required. The process of re-determining may refer to embodiment two, and is not described herein again.
When the target camera serving as the clock source is abnormal, the monitoring platform can actively sense the abnormality and autonomously switch the clock source, so that high availability and reliability of time synchronization are realized.
And step 304, carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera.
After the target camera of the time synchronization is determined, time synchronization is performed on the monitoring platform according to the satellite time service time acquired by the target camera, and the specific method may refer to embodiment one, which is not described herein again.
When the time on the monitoring platform is periodically synchronized, the embodiment of the invention firstly determines whether a target camera of the previous time synchronization is credible, and if so, the target camera is continuously adopted to obtain the satellite time service time; and if the target camera is not credible, re-determining a new target camera. The process that the credibility of all candidate cameras needs to be updated in each time of time synchronization is avoided, and the time synchronization efficiency is improved.
Example four
Fig. 4 is a schematic structural diagram of a time synchronization apparatus of a monitoring platform according to a fourth embodiment of the present invention, which is applicable to a case of synchronizing time on the monitoring platform. As shown in fig. 4, the apparatus includes:
a credibility determination module 410, configured to determine the credibility of candidate cameras configured with a satellite positioning module on the monitoring platform; the satellite positioning module is used for acquiring satellite time service;
a target camera determination module 420, configured to determine a target camera according to the magnitude of the reliability;
and a time synchronization module 430, configured to perform time synchronization on the monitoring platform according to the satellite time service time obtained by the satellite positioning module in the target camera.
The method comprises the steps of determining the reliability of a candidate camera provided with a satellite positioning module on a monitoring platform; the satellite positioning module is used for acquiring satellite time service; determining a target camera according to the reliability; and carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera. According to the embodiment of the invention, the time synchronization is carried out through the cameras which are registered on the monitoring platform and are provided with the satellite positioning modules, and no additional server is required to be deployed and subsequent maintenance is required, so that the time synchronization efficiency is improved; meanwhile, time synchronization is carried out by adopting satellite time service time, the accuracy of time synchronization of the monitoring platform is ensured, and the problem of time error caused by inaccurate local clock source to the monitoring platform is solved.
Optionally, the time synchronization module includes:
the satellite time service acquisition unit is used for acquiring the satellite time service sent by the target camera;
the time delay determining unit is used for determining time delay compensation time according to transmission time delay between the monitoring platform and the target camera;
and the synchronous time determining unit is used for determining synchronous time according to the satellite time service time and the compensation time.
Optionally, the delay determining unit includes:
sending a time acquisition request to the target camera, and determining the sending time of the time acquisition request;
receiving response information which is sent by the target camera according to the time acquisition request and carries satellite time service time, and determining the receiving time of the response information;
and determining delay compensation time according to the sending time and the receiving time.
Optionally, the apparatus further comprises: a synchronization time updating module, configured to, after performing time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera:
if the preset time interval is reached, updating the credibility of the candidate camera on the monitoring platform to obtain the updated credibility of the candidate camera;
re-determining the target camera according to the updated credibility;
and carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the re-determined target camera.
Optionally, the apparatus further includes a target camera determination module, configured to, after determining the target camera according to the magnitude of the reliability:
judging whether the credibility of the target camera is smaller than a preset credibility threshold value or not;
if yes, a local clock source is adopted;
if not, executing: and carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera.
Optionally, the apparatus further includes a target camera update module, configured to, after performing time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera:
if the preset time interval is reached, updating and judging the online state and the credibility of the target camera;
if the target camera is in an online state and the updated reliability is greater than or equal to a preset reliability threshold, not updating the target camera;
if the target camera is in an off-line state or the updated reliability is smaller than a preset reliability threshold, re-determining the target camera according to the updated reliability of the candidate camera on the monitoring platform;
and carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera.
Optionally, the confidence level of the candidate camera is determined according to at least one of the following items: satellite signal anti-interference capability, network stability and equipment stability of the candidate cameras;
wherein the satellite signal interference rejection is determined according to at least one of: the set position of the machine position, the building density around the machine position, the height of the machine position, the weather and the number of the cameras connected with the satellites; the network stability is determined according to a networking mode and/or network detection data; and the stability of the equipment is determined according to the self-stable operation time of the camera.
The time synchronization device of the monitoring platform provided by the embodiment of the invention can execute the time synchronization method of the monitoring platform provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of executing the time synchronization method of the monitoring platform.
EXAMPLE five
Fig. 5 is a schematic structural diagram of an electronic device according to a fifth embodiment of the present invention. FIG. 5 illustrates a block diagram of an exemplary electronic device 12 suitable for use in implementing embodiments of the present invention. The electronic device 12 shown in fig. 5 is only an example and should not bring any limitation to the function and the scope of use of the embodiment of the present invention.
As shown in FIG. 5, electronic device 12 is embodied in the form of a general purpose computing device. The components of electronic device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory device 28, and a bus 18 that couples various system components including the system memory device 28 and the processing unit 16.
The system storage 28 may include computer system readable media in the form of volatile storage, such as Random Access Memory (RAM)30 and/or cache storage 32. The electronic device 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 5, and commonly referred to as a "hard drive"). Although not shown in FIG. 5, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 18 by one or more data media interfaces. Storage 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility 40 having a set (at least one) of program modules 42 may be stored, for example, in storage 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may comprise an implementation of a network environment. Program modules 42 generally carry out the functions and/or methodologies of the described embodiments of the invention.
The processing unit 16 executes various functional applications and data processing by running programs stored in the system storage device 28, for example, to implement a time synchronization method of a monitoring platform provided by an embodiment of the present invention, including:
determining the credibility of candidate cameras configured with a satellite positioning module on a monitoring platform; the satellite positioning module is used for acquiring satellite time service;
determining a target camera according to the reliability;
and carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera.
EXAMPLE six
The sixth embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a time synchronization method for a monitoring platform, where the method includes:
determining the credibility of candidate cameras configured with a satellite positioning module on a monitoring platform; the satellite positioning module is used for acquiring satellite time service;
determining a target camera according to the reliability;
and carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera.
Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + +, or the like, as well as conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A time synchronization method for a monitoring platform is characterized by comprising the following steps:
determining the credibility of candidate cameras configured with a satellite positioning module on a monitoring platform; the satellite positioning module is used for acquiring satellite time service;
determining a target camera according to the reliability;
and carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera.
2. The method of claim 1, wherein the time synchronization of the monitoring platform according to the satellite time service acquired by the satellite positioning module in the target camera comprises:
acquiring satellite time service time sent by the target camera;
determining delay compensation time according to transmission delay between the monitoring platform and the target camera;
and determining synchronous time according to the satellite time service time and the compensation time.
3. The method of claim 2, wherein determining a delay compensation time based on a transmission delay between the monitoring platform and the target camera comprises:
sending a time acquisition request to the target camera, and determining the sending time of the time acquisition request;
receiving response information which is sent by the target camera according to the time acquisition request and carries satellite time service time, and determining the receiving time of the response information;
and determining delay compensation time according to the sending time and the receiving time.
4. The method of claim 1, wherein after time synchronizing the monitoring platform according to the satellite time service acquired by the satellite positioning module in the target camera, the method further comprises:
if the preset time interval is reached, updating the credibility of the candidate camera on the monitoring platform to obtain the updated credibility of the candidate camera;
re-determining the target camera according to the updated credibility;
and carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the re-determined target camera.
5. The method of claim 1, wherein after determining a target camera based on the magnitude of the confidence level, the method further comprises:
judging whether the credibility of the target camera is smaller than a preset credibility threshold value or not;
if yes, a local clock source is adopted;
if not, executing: and carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera.
6. The method of claim 1, wherein after time synchronizing the monitoring platform according to the satellite time service acquired by the satellite positioning module in the target camera, the method further comprises:
if the preset time interval is reached, updating and judging the online state and the credibility of the target camera;
if the target camera is in an online state and the updated reliability is greater than or equal to a preset reliability threshold, not updating the target camera;
if the target camera is in an off-line state or the updated reliability is smaller than a preset reliability threshold, re-determining the target camera according to the updated reliability of the candidate camera on the monitoring platform;
and carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera.
7. The method of claim 1, wherein the confidence level of the candidate camera is determined based on at least one of: satellite signal anti-interference capability, network stability and equipment stability of the candidate cameras;
wherein the satellite signal interference rejection is determined according to at least one of: the set position of the machine position, the building density around the machine position, the height of the machine position, the weather and the number of the cameras connected with the satellites; the network stability is determined according to a networking mode and/or network detection data; and the stability of the equipment is determined according to the self-stable operation time of the camera.
8. A time synchronizer for a monitoring platform, comprising:
the reliability determining module is used for determining the reliability of candidate cameras which are provided with the satellite positioning module on the monitoring platform; the satellite positioning module is used for acquiring satellite time service;
the target camera determining module is used for determining a target camera according to the reliability;
and the time synchronization module is used for carrying out time synchronization on the monitoring platform according to the satellite time service time acquired by the satellite positioning module in the target camera.
9. An electronic device, comprising:
one or more processors;
a storage device for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the method for time synchronization of a monitoring platform of any of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out a method for time synchronization of a monitoring platform according to any one of claims 1 to 7.
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