CN115981135B - Military vehicle-mounted time system equipment, control method thereof and time system processing board - Google Patents
Military vehicle-mounted time system equipment, control method thereof and time system processing board Download PDFInfo
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- CN115981135B CN115981135B CN202310259054.9A CN202310259054A CN115981135B CN 115981135 B CN115981135 B CN 115981135B CN 202310259054 A CN202310259054 A CN 202310259054A CN 115981135 B CN115981135 B CN 115981135B
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Abstract
The invention discloses a military vehicle-mounted time system device, a control method thereof and a time system processing board, wherein the control method of the military vehicle-mounted time system device comprises the following steps: acquiring an external clock signal and a local clock signal, wherein the external clock signal comprises a Beidou external clock signal and an equipment external clock signal; according to the military vehicle-mounted time system equipment control method, abnormal conditions of an external clock are divided into two conditions that the external clock signal of the Beidou is abnormal and the external clock signal of the equipment is not abnormal, and the external clock signal of the Beidou is abnormal and the external clock signal of the equipment is abnormal, and corresponding switching control is carried out on signal sources for outputting time service signals under the two abnormal conditions respectively; and when the Beidou external clock signal is obtained again, judging whether the calculated stable value of the received Beidou external signal is matched with the actual stable value or not through the stable value of the received Beidou external signal, and switching the clock synchronization source according to the matching result. The invention improves the stability of the time service function of the military vehicle-mounted time system equipment.
Description
Technical Field
The invention relates to the technical field of military vehicle-mounted time system equipment, in particular to military vehicle-mounted time system equipment, a control method thereof and a time system processing board.
Background
At present, a military vehicle needs to be provided with time system equipment to realize communication with a Beidou satellite, so as to acquire Beidou external clock signals output by the Beidou satellite and equipment external clock signals output by external clock equipment in real time to realize the time service function of the time system equipment.
However, due to the fact that the activity of the military vehicle is high, communication with the Beidou satellite is affected by the external environment and human factors, the time service function stability of the military vehicle-mounted time system equipment is poor.
Disclosure of Invention
The invention mainly aims to provide a military vehicle-mounted time system device, which aims to solve the problem that the stability of time service functions is poor due to the fact that the surrounding environment of a military vehicle is extremely complex.
In order to achieve the above purpose, the present invention provides a military vehicle-mounted time system device, and the control method of the military vehicle-mounted time system device includes:
acquiring an external clock signal and a local clock signal, wherein the external clock signal comprises a Beidou external clock signal and an equipment external clock signal;
determining an abnormal condition of an external clock signal;
when the abnormal condition of the external clock signal is determined to be abnormal of the Beidou external clock signal and the external clock signal of the equipment is not abnormal, determining whether the number of the external clock signals of the equipment is a plurality of; when the number of the external clock signals of the equipment is determined to be a plurality of, acquiring the signal types of the external clock signals of each equipment, and determining the external clock signal of the highest priority in the external clock signals of the plurality of equipment according to the signal types of the external clock signals of the plurality of equipment and the preset mapping relation between the types and the priorities of the external clock signals of the equipment; performing input signal processing on the equipment external clock signal with the highest priority so as to determine a time service signal according to the equipment external clock signal with the highest priority after the input signal processing, and outputting the determined time service signal after performing output signal processing; and taking the device external clock signal with the highest priority after the input signal processing as a clock synchronization source of the local clock signal, so that the local clock signal tracks and locks the device external clock signal with the highest priority after the input signal processing;
when the abnormal condition of the external clock signal is determined to be abnormal of the Beidou external clock signal and the equipment external clock signal, switching to a local clock signal of the equipment external clock signal with the highest priority after the tracking and locking input signal processing, determining to output a time service signal, and processing the determined time service signal to output the output signal;
the control method of the military vehicle-mounted time system equipment further comprises the following steps: when the Beidou external clock signal is re-acquired, acquiring an actual stable value of a time service signal output in a preset period; according to the acquired Beidou external clock signal, determining a calculated stable value of a time service signal output according to the acquired Beidou external clock signal in a preset period; determining whether the calculated stable value matches the actual stable value; when the calculated stable value is determined to be matched with the actual stable value and a clock source switching signal is received, switching to input signal processing on the newly acquired Beidou external clock signal so as to determine a time service signal according to the Beidou external clock signal which is newly acquired after the input signal processing, and outputting the determined time service signal after output signal processing; and taking the Beidou external clock signals re-acquired after the input signal processing as clock synchronization sources of the local clock signals and the external clock signals of all the devices, so that the Beidou external clock signals are re-acquired after the local clock signals and the external clock signals of all the devices are tracked and locked and the input signal processing.
Optionally, the input signal processing includes an input transmission delay compensation processing and a digital filtering processing.
Optionally, the determined time service signal is output after being output signal processing, specifically:
the stable value of the time service signal output in the preset period is obtained, and the determined time service signal is output after synchronous processing according to the stable value, so that the output time service signal is output after being synchronous with the stable value.
Optionally, when it is determined that any one of the beidou external clock signal and the device external clock signal is not abnormal, it is determined that the external clock signal is not abnormal.
Optionally, the method for controlling the military vehicle-mounted time system device comprises the following steps:
and adjusting the priority of the external clock signals of each device according to the received priority adjusting signals.
The invention also provides a time system processing board which is applied to the military vehicle-mounted time system equipment and comprises:
a memory; the method comprises the steps of,
and the processor is used for storing a military vehicle-mounted time system equipment control program which is stored in the memory and executed by the processor, and the military vehicle-mounted time system equipment control program realizes the military vehicle-mounted time system equipment control method when being executed by the processor.
The invention also provides a military vehicle-mounted time system device which comprises the time system processing board.
According to the technical scheme, abnormal conditions of an external clock are divided into two conditions that a Beidou external clock signal is abnormal and an equipment external clock signal is not abnormal, and the Beidou external clock signal is abnormal and the equipment external clock signal is abnormal, and corresponding switching control is carried out on signal sources for outputting time service signals under the two abnormal conditions respectively; and when the Beidou external clock signal is obtained again, judging whether the calculated stable value of the received Beidou external clock signal is matched with the actual stable value or not through the stable value of the received Beidou external clock signal, and switching the clock synchronization source according to the matching result. The control method of the military vehicle-mounted time system equipment can reduce the influence of the surrounding environment of a military vehicle on the output time service signal, so that the military vehicle-mounted time system equipment can continuously and uninterruptedly output a stable time service signal to the rear-end functional module no matter when an external clock signal is abnormal or not abnormal, the stability of the time service function of the military vehicle-mounted time system equipment, particularly the military vehicle-mounted time system equipment, is greatly improved, and the problem that the military vehicle-mounted time system equipment is poor in time service function stability due to extremely complex surrounding environment of the military vehicle is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the steps in a control method of a military vehicle-mounted time system device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a hardware operating environment of an embodiment of a time system processing board according to the present invention.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The invention provides a military vehicle-mounted time system device.
For military vehicles, a time system device is often required to be mounted to realize communication with a Beidou satellite, so that an external clock signal output by the Beidou satellite is acquired in real time to realize the time service function of the time system device. However, for the military vehicle, since the military vehicle is usually in an abnormal natural environment or an abnormal artificial environment with strong signal shielding, strong signal interference and more deception signals, the external clock signal received by the vehicle is very easy to be interfered, for example, the vehicle receives weak and unstable external clock signals, or even the vehicle cannot receive the external clock signals. Therefore, for the military vehicle-mounted time system equipment, under the condition that the external clock signal is interfered, the time service signals output to other functional modules by the military vehicle-mounted time system equipment according to the external clock signal are obviously also severely interfered, namely, the time service function stability of the military vehicle-mounted time system equipment is poor, so that the other functional modules work abnormally, and the use of the military vehicle in the natural environment or the artificial environment is not facilitated.
To solve the above problems, referring to fig. 1, the method for controlling a military vehicle-mounted time system device includes:
step S100, acquiring an external clock signal and a local clock signal.
The execution subject of the control method provided by the embodiment of the application can be a time system processing board in a military vehicle-mounted time system device. The external clock signal in this embodiment may include: the Beidou external clock signal and the equipment external clock signal. The time system processing board can be in wireless communication connection with the Beidou satellite through a wireless communication circuit and an antenna; the antenna can receive Beidou satellite signals which are sent out by the Beidou satellite signals and are in corresponding frequency bands, the Beidou external clock signals are in electromagnetic wave forms, the electromagnetic wave external clock signals can be converted into electric signals and then output to the wireless communication circuit, and the electric signals are output to the time system processing board after being processed by the wireless communication circuit so that the time system processing board can acquire the Beidou external clock signals. The military vehicle-mounted time system equipment can be further provided with at least one external equipment interface, and each external equipment interface can be used for being connected with an external clock equipment to access a clock signal output by the external clock equipment, namely, an equipment external clock signal and outputting the equipment external clock signal to the time system processing board so as to enable the time system processing board to acquire the equipment external clock signal. The external clock device is a stand-alone device which can be arranged separately from the military vehicle-mounted time system device.
The military vehicle-mounted time system equipment can be further provided with local time sources such as a crystal oscillator and an atomic clock, wherein the atomic can be realized by adopting a rubidium atomic clock. The time system processing board can be connected with a local time source through a circuit board wiring or a signal wire so as to access a local clock signal output by the local time source.
Step 200, when determining that the external clock signal is abnormal, determining an abnormal condition of the external clock;
the external clock signal abnormality, i.e., the pointer external clock signal is at least one of disturbed and lost, is not limited herein. The time system processing board can detect signal parameters of signals output by the wireless communication circuit or the external equipment interface in real time, and can match the detected signal parameters with corresponding parameter thresholds or parameter intervals to judge whether the external clock signal which is accessed currently is abnormal or not. For example, the time system processing board may be pre-integrated with a first parameter interval, a second parameter interval, a third parameter interval, and a fourth parameter interval, wherein a maximum signal parameter in the first parameter interval is not greater than a minimum signal parameter in the second parameter interval, a maximum signal parameter in the second parameter interval is not greater than a minimum signal parameter in the third parameter interval, and a maximum signal parameter in the third parameter interval is not greater than a minimum signal parameter in the fourth parameter interval; the time system processing board can determine that the external clock signal is lost when determining that the detected signal parameter is matched with the first parameter interval; when the detected signal parameter is matched with the second parameter interval or the fourth parameter interval, the external clock signal is determined to be interfered; and when the detected signal parameter is determined to be matched with the third parameter interval, determining that the external clock signal is normal. The signal parameter may include at least one of a signal current, a signal voltage, a signal power, a signal timing, and a signal waveform, which is not limited herein;
the time system processing board can determine whether the Beidou external clock signal and the equipment external clock signal are abnormal or not, and can determine that the external clock signal is abnormal when the determination result is that any one of the Beidou external clock signal and the equipment external clock signal is abnormal; and when the determining result is that the Beidou external clock signal and the equipment external clock signal are not abnormal, determining that the external clock signal is not abnormal. Therefore, when all the external clock signal sources are abnormal, the step S300 or the step S400 is switched to be executed, so that the time service signal is output by using the external clock signal as much as possible, and the accuracy of the time service signal is improved.
In practical use, since the environment where the military vehicle moves changes rapidly, even if the military vehicle is in a normal natural environment or a normal artificial environment, the external clock signal received by the timing processing board also fluctuates, so in an embodiment, whether the external clock signal is abnormal is determined as whether the external clock signal is lost or not.
Step S300, if the abnormal condition of the external clock signal is that the Beidou external clock signal is abnormal and the equipment external clock signal is not abnormal, determining whether the number of the equipment external clock signals is a plurality of; when the number of the external clock signals of the equipment is determined to be a plurality of, acquiring the signal types of the external clock signals of each equipment, and determining the external clock signal of the highest priority in the external clock signals of the plurality of equipment according to the signal types of the external clock signals of the plurality of equipment and the preset mapping relation between the types and the priorities of the external clock signals of the equipment; performing input signal processing on the equipment external clock signal with the highest priority so as to determine a time service signal according to the equipment external clock signal with the highest priority after the input signal processing, and outputting the determined time service signal after performing output signal processing; and taking the device external clock signal with the highest priority after the input signal processing as a clock synchronization source of the local clock signal, so that the local clock signal tracks and locks the device external clock signal with the highest priority after the input signal processing.
In this embodiment, when it is determined that the external clock signal is not abnormal, the timing system processing board may perform corresponding signal processing, that is, input signal processing, on the external clock signal of the accessed electrical signal to obtain a stable and standard external clock signal after signal processing, and may operate a pre-integrated hardware circuit and a software program or algorithm to generate a time service signal according to the stable and standard external clock signal after signal processing, and may perform signal processing on the generated time service signal, that is, output the signal after signal processing to the back-end functional module, so as to improve stability and anti-fluctuation of the time service signal received by the back-end functional module. For convenience of description, the signal of the external clock signal after being processed by the input signal at normal time is defined as an intermediate external clock signal. Because the external clock signal is not abnormal at this time, the timing system processing board can set the stable and standard external clock signal after the input signal is processed and the intermediate external clock signal as the clock synchronous source of the local clock signal, so as to modulate the accessed local clock signal according to the intermediate external clock signal, so that the modulated local clock signal can be consistent with the intermediate external clock signal in real time, thereby realizing that the local clock signal tracks and locks the external clock signal after the input signal is processed, and the timing system processing board can be switched for use when the external clock signal is abnormal.
The time system processing board can determine whether the abnormal condition of the external clock signal is abnormal of the Beidou external clock signal when the external clock signal is abnormal, and the equipment external clock signal is not abnormal, and can further determine whether the equipment external clock signal is one or more when the abnormal condition is the Beidou external clock signal and the equipment external clock signal is not abnormal.
If the external clock signal of the equipment is one at this time, the time system processing board can directly process the input signal of the external clock signal of the equipment so as to determine to generate the time service signal according to the external clock signal of the equipment after the input signal is processed. If the number of the external clock signals of the equipment is multiple at this time, the time system processing board can respectively determine the signal types of the external clock signals of the equipment, and can call a pre-stored mapping relation between the types and the priority of the preset external clock signals of the equipment to determine the priority of the types of the signals. The time system processing board can sort or compare the priorities of the signal types to determine the signal type with the highest priority and the corresponding equipment external clock signal thereof, the time system processing board can only perform input signal processing on the equipment external clock signal with the highest priority, and can determine to generate a time service signal according to the processed equipment external clock signal with the highest priority. The preset mapping relationship between the type of the external clock signal and the priority level may be set by measuring the anti-interference performance of the external clock signal of the device with various signal types in advance, where the priority levels of the various signal types may be proportional to the anti-interference performance of the external clock signal of the device with various signal types, that is, the higher the anti-interference performance, the higher the priority level corresponding to the signal type of the external device with higher anti-interference performance, the lower the priority level corresponding to the signal type of the external device with lower anti-interference performance. Therefore, when the Beidou external clock signal is abnormal, the timing system processing board can be preferentially switched to the equipment external clock signal with the highest anti-interference performance to generate the time service signal, so that the accuracy of the time service signal after switching is improved.
At this time, the timing system processing board may perform input signal processing on only the highest priority device external clock signal to obtain an intermediate external clock signal, and may set the intermediate external clock signal as a clock synchronization source of the local clock signal, so as to modulate the accessed local clock signal according to the intermediate external clock signal, so that the modulated local clock signal may be consistent with the intermediate external clock signal in real time. At this time, the timing system processing board may further use the highest priority external clock signal after the input signal processing as a synchronization source of the other priority external clock signals, so that the other priority external clock signals may track and lock the highest priority external clock signal after the input signal processing. In another alternative embodiment, the clock system processing board may further determine whether the external clock signal of the device currently performing the input signal processing is abnormal, and may switch to another external clock signal of the device having the higher priority or the same priority to perform the input signal processing when determining that the abnormality. Therefore, the timing system processing board can be switched to generate the timing signal according to the external clock signal of the equipment with the highest signal type of the current anti-interference performance, and the accuracy and the stability of the timing signal are improved.
The time system processing board can only perform input signal processing on the device external clock signal with the highest priority to obtain an intermediate external clock signal, and can set the intermediate external clock signal as a clock synchronization source of the local clock signal so as to modulate the accessed local clock signal according to the intermediate external clock signal, so that the modulated local clock signal can be consistent with the intermediate external clock signal in real time. At this time, the timing system processing board may further use the highest priority external clock signal after the input signal processing as a synchronization source of the other priority external clock signals, so that the other priority external clock signals may track and lock the highest priority external clock signal after the input signal processing. In another alternative embodiment, the clock system processing board may further determine whether the external clock signal of the device currently performing the input signal processing is abnormal, and may switch to another external clock signal of the device having the higher priority or the same priority to perform the input signal processing when determining that the abnormality. Therefore, the timing system processing board can be switched to generate the timing signal according to the external clock signal of the equipment with the highest signal type of the current anti-interference performance, and the accuracy and the stability of the timing signal are improved.
Step S400, if the abnormal condition of the external clock signal is that the Beidou external clock signal is abnormal and the equipment external clock signal is abnormal, switching to a local clock signal of the highest priority equipment external clock signal processed according to the tracking locking input signal, determining to output a time service signal, and processing the determined time service signal to output the output signal;
when the external clock signal is abnormal, the time system processing board can be switched to generate a time service signal according to a local clock signal consistent with the intermediate external clock signal, and can also output the generated time service signal to the rear-end functional module after processing the output signal, so that seamless switching output of the clock signal is realized. Since the abnormal natural environment and the artificial environment are difficult to influence on the local time source, the local clock signal is not influenced by the abnormal environment when the external clock signal is abnormal, and meanwhile, since the local clock signal accessed by the time system processing board is modulated to be consistent with the intermediate external clock signal, after switching, the time service signal generated by the time system processing board according to the local clock signal is also consistent with the time service signal determined according to the intermediate external clock signal. The time system processing board can record and store the modulation process of the local clock signal according to the intermediate external clock signal when the external clock signal is not abnormal, so that the stored modulation process is called to modulate the subsequently accessed local clock signal when the external clock signal is abnormal, the subsequently modulated local clock signal still can be consistent with the intermediate external clock signal in real time, and stable generation of the intermediate external clock signal is maintained when the external clock signal is abnormal.
However, in practice, the surrounding environment where the military vehicle is located is very complex, and the anti-interference performance of the external clock signal of the device with various signal types measured in advance will change along with the environmental change, so that the external clock signal of the device with the highest priority signal type is not the external clock signal with the highest anti-interference performance at present. To this problem, the method for controlling a military vehicle-mounted time system device is further provided with step S500, where step S500 includes:
when the Beidou external clock signal is re-acquired, acquiring an actual stable value of a time service signal output in a preset period; according to the acquired Beidou external clock signal, determining a calculated stable value of a time service signal output according to the acquired Beidou external clock signal in a preset period; determining whether the calculated stable value matches the actual stable value; when the calculated stable value is determined to be matched with the actual stable value and a clock source switching signal is received, switching to input signal processing on the newly acquired Beidou external clock signal so as to determine a time service signal according to the Beidou external clock signal which is newly acquired after the input signal processing, and outputting the determined time service signal after output signal processing; and taking the Beidou external clock signals re-acquired after the input signal processing as clock synchronization sources of the local clock signals and the external clock signals of all the devices, so that the Beidou external clock signals are re-acquired after the local clock signals and the external clock signals of all the devices are tracked and locked and the input signal processing.
In this embodiment, the timing system processing board may continuously reacquire the beidou external clock signal after determining that the beidou external clock signal is lost, and may determine the timing signal according to the device external clock signal or the local clock signal with the highest priority. The timing system processing board can acquire the signal amplitude of the output timing signals once every preset time period in the preset period after the Beidou external clock signal is acquired again, and can correspondingly calculate the signal amplitude of each timing signal acquired in the preset period after the preset period is finished, for example, average value calculation is carried out, and the operation result can be used as the stable value, namely the actual stable value, of the timing signals output in the preset period. The system processing board may also perform input signal processing on the retrieved beidou external clock signal to obtain an intermediate external clock signal (for representing the difference, referred to herein as a computation intermediate external clock signal), and may determine to generate a time service signal (for representing the difference, referred to herein as a computation time service signal) according to the computation intermediate external clock signal. The timing system processing board can acquire the signal amplitude of the output calculation timing signals once every interval preset time in the preset period, and can correspondingly calculate the signal amplitude of each calculation timing signal acquired in the preset period after the preset period is finished, for example, average value calculation is performed, and the operation result can be used as the stable value of the calculation timing signals output in the preset period, namely, the calculated stable value. The time system processing board can perform corresponding operation on the actual stable value and the calculated stable value, for example, after subtraction operation, whether an operation result reaches a preset value or not is determined, and when the operation result reaches the preset value, the calculated stable value is determined to be matched with the actual stable value; and when the operation result is determined to not reach the preset value, determining that the calculated stable value is not matched with the actual stable value. Wherein the preset value may be a zero value or a smaller value.
When the calculated value is matched with the actual stable value, the timing system processing board can control the corresponding prompting device to send prompting information so that an operator in the carriage can know that the re-accessed Beidou external clock signal is stable and correct, and the operator can output a clock source switching signal to the timing system processing board by triggering the adjusting panel after knowing, so that the timing system processing board can switch a processing object of input signal processing into the re-acquired Beidou external clock signal after receiving the clock source switching signal to generate an intermediate external clock signal and a subsequent timing signal. The system processing board also uses the obtained intermediate external clock signal as a clock synchronization source of the external clock signal of each device, so that the local clock signal and the external clock signal of each device can be consistent with the regenerated intermediate external clock signal after switching. So cycle is reciprocal, no matter whether big dipper external clock signal is unusual, all can make the timing system processing board continuously output with big dipper external clock signal assorted time service signal to be favorable to improving time service function's stability.
When the calculated value is not matched with the actual stable value, the timing system processing board can continue to perform input signal processing on the device external clock signal with the highest priority after the input signal processing so as to determine a time service signal according to the device external clock signal with the highest priority after the input signal processing, and take the device external clock signal with the highest priority after the input signal processing as a synchronous source of the local clock signal so as to enable the local clock signal to track and lock the device external clock signal with the highest priority after the input signal processing.
Therefore, the influence of the surrounding environment of the military vehicle on the output time service signal can be reduced, the time service signal which is stable can be continuously and uninterruptedly output to the rear-end functional module no matter when the external clock signal is abnormal or not abnormal, the stability of the time service function of the military vehicle-mounted time service device, especially the military vehicle-mounted time service device, is greatly improved, and the problem that the stability of the time service function is poor due to the fact that the surrounding environment of the military vehicle-mounted time service device is extremely complex is solved.
Referring to fig. 1, the input signal processing includes an input transmission delay compensation process and a digital filtering process.
In practical application, no matter the Beidou external clock signal or the equipment external clock signal is accessed by the timing system processing board, a random signal jump phenomenon exists, so that errors exist between the generated intermediate external clock signal and the output time service signal. To solve the problem, the technical scheme of the application eliminates signal jump caused by transmission delay of the external clock signal by carrying out transmission delay compensation processing on the accessed external clock signal, and eliminates signal jump caused by clutter by carrying out digital filtering processing on the accessed external clock signal to filter clutter in the external clock signal. Therefore, the signal jump phenomenon of the external clock signal can be eliminated, and the generated intermediate external clock signal and the output time service signal can be improved in accuracy.
Referring to fig. 1, the determined time service signal is output after being output signal processing, specifically:
the stable value of the time service signal output in the preset period is obtained, and the determined time service signal is output after synchronous processing according to the stable value, so that the output time service signal is output after being synchronous with the stable value.
The working phase of the timing system processing board outputting the timing signal may include a plurality of preset periods executed in sequence. The timing system processing board can acquire the signal amplitude of the timing signals output once in a preset period every interval for a preset period, and can correspondingly calculate the signal amplitude of each timing signal acquired in the preset period after the preset period is finished, for example, average value calculation is performed, and the operation result can be used as the stable value of the timing signals output in the preset period. In the next preset period, namely when the next preset period is not finished, the timing system processing board can adjust the timing signals determined in the preset period according to the stable values of the timing signals in the previous preset period, so that the timing signals determined in the preset period after adjustment can be equal to the stable values of the timing signals in the previous preset period, and synchronous processing of the timing signals is realized. The method comprises the following steps: the time system processing board can calculate the difference between the signal amplitude of the time service signal in the preset period and the stable value of the time service signal in the previous preset period, and can correspondingly reduce the signal amplitude of the time service signal according to the difference calculation result when the difference calculation result is a positive value so that the reduced signal amplitude is equal to the stable value; when the difference value calculation result is a negative value, correspondingly increasing the signal amplitude of the time service signal according to the difference value calculation result so that the increased signal amplitude is equal to the stable value; and when the difference value is zero, the signal amplitude of the time service signal is not adjusted. It can be understood that the timing system processing board performs synchronous processing on the timing signals in the next preset period, and calculates the stable value of the timing signals output in the next preset period. In the first preset period, the time service signal acquired in the first preset period can be synchronized with a preset stable value. The time service signals output in each preset period are the same and are all preset stable values, so that the output stability of the time service signals is improved.
However, in practice, the surrounding environment where the military vehicle is located is very complex, and the anti-interference performance of the external clock signal of the device with various signal types measured in advance will change along with the environmental change, so that the external clock signal of the device with the highest priority signal type is not the external clock signal with the highest anti-interference performance at present. To solve the problem, the control method of the military vehicle-mounted time system equipment comprises the following steps:
and adjusting the priority of the external clock signals of each device according to the received priority adjusting signals.
The military vehicle can be further provided with a special adjusting panel which can be in communication connection with the time system processing board, the adjusting panel can be used for a user to trigger and adjust the priority of external clock signals of all equipment, and the priority adjusting signal can be output to the time system processing board in response to the triggering of the user. The time system processing board can determine external clock signals of all target devices to be regulated and priority regulation amounts corresponding to all target external clock devices according to the received priority regulation signals; the time system processing board can increase or decrease the current priority of the external clock signals of each target device by a corresponding priority adjustment amount according to the determination result, and can process the input signal of the device external clock signal with the highest priority after adjustment to be used as a synchronous source of the local clock signal, so that the local clock signal tracks and locks the device external clock signal with the highest priority after the input signal is processed.
Therefore, operators in the carriage can manually adjust the priority of the external clock signals of each device according to the environment and experience of the military vehicle, so that the switching of the external clock signals of the devices for processing the input signals is realized, and the use flexibility of the vehicle-mounted time system control method is improved.
The invention also provides a time system processing board which is applied to the military vehicle-mounted time system equipment.
Referring to fig. 2, the time system processing board includes:
a memory 11; the method comprises the steps of,
a processor 12, a military vehicle-mounted time system device control program stored on the memory 11 and executed by the processor 12, which when executed by the processor 12, implements the military vehicle-mounted time system device control method as described above.
The specific steps of the control method of the military vehicle-mounted time system equipment refer to the above embodiments, and since the motor controller adopts all the technical schemes of all the embodiments, at least the technical schemes of the embodiments have all the beneficial effects, and the detailed description is omitted. The memory 11 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory, and the memory 11 may alternatively be a storage device independent of the control device; the processor 12 may be a CPU. The memory 11 and the processor 12 are connected by a communication bus 13, which communication bus 13 may be a UART bus or an I2C bus.
The invention also provides a military vehicle-mounted time system device, which comprises a time system processing board, wherein the specific structure of the time system processing board refers to the embodiment, and the military vehicle-mounted time system device adopts all the technical schemes of all the embodiments, so that the military vehicle-mounted time system device at least has all the beneficial effects brought by the technical schemes of the embodiments, and is not repeated herein.
The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (7)
1. The control method of the military vehicle-mounted time system device is characterized by comprising the following steps of:
s100, acquiring an external clock signal and a local clock signal, wherein the external clock signal comprises a Beidou external clock signal and an equipment external clock signal;
s200, when the abnormality of the external clock signal is determined, determining the abnormality of the external clock;
s300, if the abnormal condition of the external clock signal is that the Beidou external clock signal is abnormal and the equipment external clock signal is not abnormal, determining whether the number of the equipment external clock signals is a plurality of; when the number of the external clock signals of the equipment is determined to be a plurality of, acquiring the signal types of the external clock signals of each equipment, and determining the external clock signal of the highest priority in the external clock signals of the equipment according to the signal types of the external clock signals of the equipment and the preset mapping relation between the types and the priorities of the external clock signals of the equipment; performing input signal processing on the equipment external clock signal with the highest priority so as to determine a time service signal according to the equipment external clock signal with the highest priority after the input signal processing, and outputting the determined time service signal after performing output signal processing; and taking the device external clock signal with the highest priority after the input signal processing as a clock synchronization source of the local clock signal, so that the local clock signal tracks and locks the device external clock signal with the highest priority after the input signal processing;
s400, if the abnormal condition of the external clock signal is that the Beidou external clock signal is abnormal and the equipment external clock signal is abnormal, switching to a local clock signal of the highest-priority equipment external clock signal processed according to the tracking locking input signal, determining and outputting a time service signal, and processing and outputting the determined time service signal;
s500, the control method of the military vehicle-mounted time system equipment further comprises the following steps: when the Beidou external clock signal is re-acquired, acquiring an actual stable value of a time service signal output in a preset period; according to the acquired Beidou external clock signal, determining a calculated stable value of a time service signal output according to the acquired Beidou external clock signal in a preset period; determining whether the calculated stable value matches the actual stable value; when the calculated stable value is determined to be matched with the actual stable value and a clock source switching signal is received, switching to input signal processing on the newly acquired Beidou external clock signal so as to determine a time service signal according to the Beidou external clock signal which is newly acquired after the input signal processing, and outputting the determined time service signal after output signal processing; and taking the Beidou external clock signals re-acquired after the input signal processing as clock synchronization sources of the local clock signals and the external clock signals of all the devices, so that the Beidou external clock signals are re-acquired after the local clock signals and the external clock signals of all the devices are tracked and locked and the input signal processing.
2. The method for controlling a military vehicle-mounted time system device of claim 1, wherein said input signal processing includes an input transmission delay compensation process and a digital filtering process.
3. The control method of the military vehicle-mounted time system equipment according to claim 1, wherein the determined time service signal is output after being output signal processing, specifically:
the stable value of the time service signal output in the preset period is obtained, and the determined time service signal is output after synchronous processing according to the stable value, so that the output time service signal is output after being synchronous with the stable value.
4. A military vehicle-mounted time system equipment control method as claimed in any one of claims 1 to 3, wherein when it is determined that any one of the beidou external clock signal and the equipment external clock signal is not abnormal, it is determined that the external clock signal is not abnormal.
5. The method for controlling a military vehicle-mounted time system device according to claim 1, wherein the method for controlling a military vehicle-mounted time system device comprises:
and adjusting the priority of the external clock signals of each device according to the received priority adjusting signals.
6. A time system processing board for a military vehicle-mounted time system device, comprising:
a memory; the method comprises the steps of,
a processor, a military vehicle-mounted time system device control program stored on the memory and executed by the processor, which when executed by the processor, implements the military vehicle-mounted time system device control method of any one of claims 1-5.
7. A military vehicle-mounted time system apparatus comprising the time system processing board of claim 6.
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