A wireless shock wave overpressure test system and method based on synchronous timing

Abstract

The application discloses a wireless shock wave overpressure test system and method based on synchronous timing, and relates to the technical field of explosion shock wave testing. The test system is composed of a plurality of test nodes, and the test node comprises an impact wave pressure sensor, an overpressure signal pre-processing module, an internal trigger acquisition module, a storage module, a microcontroller, a wireless module, a time service module, a USB transmission module and a power management module. The test system is an impact wave overpressure test system with excellent performance and comprehensive functions. The test system utilizes the key technology of delay internal trigger partition storage to realize accurate triggering, high-speed acquisition and complete storage of explosion shock waves, utilizes LORA wireless technology to realize remote control, data return and wireless setting, utilizes synchronous timing to realize high-precision time synchronization of multiple nodes and ordered transmission of multiple node data, and solves the problems of low synchronization accuracy of multiple test points and chaotic transmission of multiple-to-one data in the impact wave test.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of explosion shock wave test, and particularly relates to a wireless shock wave overpressure test system and method based on synchronous timing. BACKGROUND

[0002] The shock wave is the main source of long-distance killing in the explosion process of a warhead and is the most destructive damage element. The shock wave overpressure test is a key technical means for warhead explosion power test and damage effect evaluation, and also provides an important reference for the development and acceptance of weapons and the research of explosion-proof buildings and explosion-proof tools.

[0003] At present, the shock wave overpressure test generally adopts the electric measurement method, and the electric measurement method is divided into the traditional lead electric measurement method and the storage test method. The traditional lead electric measurement method is to connect each collection device and a computer through a long cable, and the test data is transmitted in real time through the cable, and there are problems such as a plurality of cables being staggered and complicated, on-site layout being difficult, and cable transmission being disturbed by noise. The storage test method makes up for the defect of wiring difficulty of the lead electric measurement method. A complete shock wave test system is to arrange a plurality of test nodes around the explosion center, collect and store the overpressure signals when the explosion occurs, and upload the data to the computer end through wired or wireless mode after the experiment is finished for data processing and analysis. However, the test system using the storage test method currently all faces problems such as low synchronization accuracy between multiple nodes, limited wireless control distance, and chaotic data transmission of multiple nodes, which need to be solved urgently and are not conducive to the control and data recovery of the test nodes. With the development of weapons and equipment, the power evaluation of weapons and ammunition puts forward higher requirements for the test system, and the storage test system gradually tends to be intelligent, portable and functional, so as to meet the shock wave overpressure test in more scenes and even in harsh environments.

[0004] Therefore, there is an urgent need for a wireless shock wave overpressure test system to solve the problems such as low synchronization accuracy between multiple nodes, limited control distance, chaotic data transmission of multiple nodes, and poor environmental adaptability. SUMMARY

[0005] In view of the above deficiencies in the prior art, the wireless shock wave overpressure test system and method based on synchronous timing provided by the present application solve the problems of low synchronization accuracy between multiple nodes, limited control distance, chaotic data transmission of multiple nodes, and poor environmental adaptability existing in the prior art.

[0006] In order to achieve the above-mentioned application purposes, the technical scheme adopted by the present application is as follows: a wireless shock wave overpressure test system based on synchronous timing, comprising a plurality of test nodes, each overpressure test node comprising a power management module, and an impact wave pressure sensor, an overpressure signal preprocessing module, an internal trigger collection module, an ARM microcontroller, a wireless LORA module, a time service module and a storage module all connected with the power management module.

[0007] The shock wave pressure sensor, the overpressure signal preprocessing module and the internal trigger acquisition module are sequentially connected in communication, the internal trigger acquisition module is further connected in communication with the ARM microprocessor and the storage module, the wireless LORA module is connected in communication with the ARM microcontroller, the time module is further connected in communication with the storage module and the ARM microcontroller, and the storage module is further connected in communication with the USB transmission interface.

[0008] Further, the shock wave pressure sensor is used to convert the collected external pressure signal into a voltage signal.

[0009] The overpressure signal preprocessing module is used to preprocess the voltage signal output by the shock wave pressure sensor.

[0010] The internal trigger acquisition module is used to convert the preprocessed voltage signal into a digital signal through a digital-to-analog converter, and to perform internal trigger discrimination on the collected digital signal.

[0011] The storage module is used to store the system data and the collected data in different areas.

[0012] The ARM microcontroller is used to coordinate the work of each module and perform data processing.

[0013] The wireless LORA module is used for wireless networking of each test node, remote control of the test node and wireless transmission of key data.

[0014] The time module is used to accept synchronization time information and generate high-precision pulses.

[0015] The power management module is used to provide power voltage for each module and sensor, and to complete the charging and discharging of the battery in the test node.

[0016] Further, in the internal trigger acquisition module, when the collected digital signal is greater than the set voltage threshold, the formal acquisition is triggered, and the shock wave signal is collected.

[0017] Further, the storage partition of the storage module includes a threshold data area, a pre-acquisition data area, a DMA data cache area and a formal acquisition data area.

[0018] In the formal acquisition data area, the complete shock wave signal data is stored in the Fattfs file system, and the stored data file is transmitted in the USB communication mode.

[0019] Further, the test nodes are distributed in several layers around the explosion center in a ring shape, and are connected with the PC host computer through the wireless LORA module.

[0020] A wireless shock wave overpressure test method, comprising the following steps:

[0021] S1, test preparation: arranging test nodes around the explosion center, starting each test node and protecting it with a protective partition;

[0022] S2, test start: remotely controlling each test node, including time setting start and pre-acquisition start;

[0023] Pre-acquiring voltage according to the set pre-acquisition start condition, and simultaneously starting a timer to count high-precision pulses;

[0024] S3, test data acquisition and storage: when the pre-acquired voltage is greater than a set threshold, triggering formal acquisition of the shock wave signal and storing it in a storage module, while stopping the timer counting;

[0025] S4, test data return: using a time slice transmission technology based on synchronous timing to return the shock wave signal acquired by each test node;

[0026] S5, test system recovery: processing and analyzing the returned data through a PC host computer to complete the overpressure test.

[0027] Further, the step S2 comprises the following sub-steps:

[0028] S21, sending a broadcast pre-acquisition instruction to each test node through a PC host computer;

[0029] The broadcast instruction contains second information of a timing time;

[0030] S22, when each test node receives the broadcast pre-acquisition instruction, starting time setting and making the time setting module constantly send ZDA messages to the ARM microcontroller through a serial port;

[0031] S23, receiving and analyzing the ZDA messages through the ARM microcontroller, and when the analyzed second information is equal to the second information of the timing time, starting voltage pre-acquisition and simultaneously starting a timer to count high-precision pulses.

[0032] Further, in the step S3, after completing formal acquisition of the shock wave signal, storing the UTC time and the pulse number counting time, and assigning time information of each acquired test node;

[0033] Wherein, the pulse number counting time is the time corresponding to the pulse number from the start of the timing time to the end of the formal acquisition triggered after the explosion, which is expressed as:

[0034] τ=ARR*COUNT+CNT

[0035] In the formula, τ represents the time corresponding to the number of recording pulses, ARR represents the value of the automatic reload register setting, COUNT is the number of timer interrupts, and CNT is the value of the counter.

[0036] Further, in the step S3, the storage module adopts a negative delay trigger technology to perform partition management on the storage area, and simultaneously utilizes double DMA interrupts to complete data moving and trigger identification.

[0037] The storage partition of the storage module comprises a threshold data area, a pre-acquisition data area, a DMA data cache area, and an official acquisition data area.

[0038] Further, the step S5 comprises the following sub-steps:

[0039] S41, sending a data back transmission instruction to each test node by a PC host computer;

[0040] The back transmission instruction carries respective information of timing time;

[0041] S42, when the timing time arrives, starting a timer to count the number of pulses;

[0042] S43, when the timer of each test node counts to a set number of pulses, transmitting the acquired shock wave signal to the PC host computer in sequence;

[0043] The set number of pulses of each test node is set according to its own number and communication time.

[0044] The present application has the following advantages:

[0045] (1) In the present application, time synchronization technology is adopted to give each test node time information, and the synchronization accuracy is better than 2 microseconds;

[0046] (2) In the present application, timing time slice transmission technology is adopted to make the test nodes form a whole through wireless networking, and the test personnel can remotely control all nodes at a distance of thousands of meters, and each node can orderly return key data;

[0047] (3) In the present application, the delay internal trigger partition storage technology is used to make the test nodes stably and reliably trigger acquisition and storage, completely record the overall process of explosion shock wave propagation, and ensure data integrity and accuracy;

[0048] Based on the above advantages, the wireless shock wave overpressure test system and method based on synchronous timing provided by the present application have excellent performance, comprehensive functions, are more intelligent, safe, and comprehensive, can perform explosion shock wave tests in indoor and outdoor environments or even harsh environments, can set the working parameter information of the nodes through wireless setting for different drug amounts or environments, and have good application prospects. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 The composition structure diagram of each test node in the wireless shock wave overpressure test system based on synchronous timing provided by the application is shown.

[0050] Figure 2 The layout schematic diagram of each test node in the wireless shock wave overpressure test system provided by the application is shown.

[0051] Figure 3 The flow chart of the wireless shock wave overpressure test method provided by the application is shown.

[0052] Figure 4 The high-precision time synchronization technology schematic diagram based on synchronous timing provided by the application is shown.

[0053] Figure 5 The time slice transmission technology schematic diagram based on synchronous timing provided by the application is shown.

[0054] Figure 6 The SDRAM partition storage schematic diagram provided by the application is shown.

[0055] Figure 7 The double-DMA buffer semi-completion interrupt data storage schematic diagram provided by the application is shown.

[0056] Figure 8 The double-DMA buffer full-completion interrupt data storage schematic diagram provided by the application is shown.

[0057] Figure 9 The test system acquisition signal generator pulse simulation experimental result diagram provided by the application is shown.

[0058] Figure 10 The 350MHz oscilloscope acquisition signal generator pulse simulation experimental result diagram provided by the application is shown. DETAILED DESCRIPTION

[0059] The specific embodiments of the application are described below to facilitate the understanding of the application by those skilled in the art, but it should be clear that the application is not limited to the scope of the specific embodiments, and for those skilled in the art, any changes within the spirit and scope of the application defined and determined by the appended claims are obvious, and all applications utilizing the concept of the application are within the scope of protection.

[0060] The embodiment of the application provides a wireless shock wave overpressure test system based on synchronous timing, which comprises a plurality of test nodes, such as Figure 1As shown in the figure, each overpressure test node comprises a power management module, and a shock wave pressure sensor, an overpressure signal preprocessing module, an internal trigger acquisition module, an ARM microcontroller, a wireless LORA module, a time-providing module and a storage module, all of which are connected with the power management module.

[0061] The shock wave pressure sensor, the overpressure signal preprocessing module and the internal trigger acquisition module are sequentially communicatively connected, the internal trigger acquisition module is further communicatively connected with the ARM microprocessor and the storage module, the wireless LORA module is communicatively connected with the ARM microcontroller, the time-providing module is further communicatively connected with the storage module and the ARM microcontroller, and the storage module is further communicatively connected with a USB transmission interface.

[0062] In the embodiment of the present application, as shown in the figure, Figure 2 The test nodes are distributed in several layers around the explosion center in a ring shape, and are all wirelessly communicated with a PC host computer through the wireless LORA module. The test nodes in the embodiment are arranged in the arrangement area around the explosion center, and form an orderly whole through wireless networking, and a tester can remotely control and data return the whole test system from a distance of one kilometer.

[0063] In the overpressure test system, the shock wave pressure sensor is used to convert the collected external pressure signal into a voltage signal; specifically, the shock wave pressure sensor is an IEPE pressure sensor, which needs a 24-26V voltage and a 2-10mA constant current source to drive, and converts the external pressure signal into an analog voltage signal.

[0064] The overpressure signal preprocessing module is used to preprocess the voltage signal output by the shock wave pressure sensor; specifically, the preprocessing of the voltage signal includes direct current isolation, filtering, amplification, baseline up-regulation and single-ended to differential processing.

[0065] The internal trigger acquisition module is used to convert the preprocessed voltage signal into a digital signal through a digital-analog converter, and to perform internal trigger discrimination on the collected digital signal.

[0066] The storage module is used to partition and store system data and collected data.

[0067] The ARM microcontroller is used to coordinate the work of each module and perform data processing.

[0068] The wireless LORA module is used for wireless networking of each test node, remote control of the test node and wireless transmission of key data.

[0069] The time-providing module is used to receive synchronous time information and generate high-precision pulses; for example, to receive time information of GPS or Beidou.

[0070] The power management module is used for providing power supply voltage for each module and sensor, and completing charging and discharging of the battery in the test node.

[0071] In the internal trigger acquisition module of the embodiment, when the acquired digital signal is greater than a set voltage threshold, the formal acquisition of the shock wave signal is triggered.

[0072] The storage partition in the storage module of the embodiment includes a threshold data area, a pre-acquisition data area, a DMA data cache area and a formal acquisition data area.

[0073] In the formal acquisition data area, the complete shock wave signal data is stored in the form of Fattfs file system, and the stored data file is transmitted in the form of USB communication.

[0074] Based on the structural composition of the wireless shock wave overpressure test system, the embodiment of the application provides a corresponding wireless shock wave overpressure test method, as shown in the figure, including the following steps: Figure 3

[0075] S1, test preparation: arranging test nodes around the explosion center, starting each test node and protecting with a protective partition;

[0076] S2, test start: remotely controlling each test node, including time setting start and pre-acquisition start;

[0077] According to the set pre-acquisition start condition, voltage pre-acquisition is performed, and a timer is started to perform high-precision pulse counting;

[0078] S3, test data acquisition and storage: when the pre-acquisition voltage is greater than a set threshold, the formal acquisition of the shock wave signal is triggered and stored in the storage module, and the timer counting is stopped;

[0079] S4, test data back transmission: using a time slice transmission technology based on synchronous timing to back transmit the shock wave signal acquired by each test node;

[0080] S5, test system recovery: processing and analyzing the back transmitted data through the PC host computer to complete the overpressure test.

[0081] In step S1 of the embodiment, in the test preparation stage, each test node is started and connected with the sensor, and the test node is protected with a protective partition; the test personnel retreat to a safe area one kilometer away and remotely control using instructions, including monitoring the test system state, changing the test system working parameters, etc.

[0082] Specifically, in the embodiment, each test node is protected to avoid damage of the test node due to high temperature fragments and other factors. ​

[0083] Step S2 in this embodiment of the invention includes the following sub-steps:

[0084] S21. Send a pre-collection command to each test node via PC host computer;

[0085] The aforementioned broadcast instruction includes a timed interval in minutes and seconds;

[0086] S22. When each test node receives the broadcast pre-acquisition instruction, it enables time synchronization and causes the time synchronization module to continuously send ZDA messages to the ARM microcontroller via the serial port.

[0087] S23. The ZDA message is received and parsed by the ARM microcontroller. When the parsed minute and second information is equal to the minute and second information of the timing time, voltage pre-acquisition is started and the timer is started at the same time to perform high-precision pulse counting.

[0088] In this embodiment, high-precision time synchronization of the test nodes is achieved through the aforementioned method of synchronizing the timing of each test node. Traditional shock wave test nodes with internal triggering operate independently because there are no wires connecting the nodes. When the voltage collected by each node exceeds a certain threshold, formal acquisition and storage are triggered. Without time synchronization, the stored data only acquires overpressure waveforms, making it impossible to analyze and process the data under a unified time reference, let alone obtain the shock wave propagation speed and construct the overpressure spatiotemporal field. Moreover, the shock wave propagation speed is extremely fast; only microsecond-level time synchronization is practically meaningful.

[0089] like Figure 4 As shown, in this embodiment, the testing system uses a combination of wireless and time synchronization to remotely control and synchronize the test nodes, assigning them time information. Specifically, the synchronization process is as follows: the tester sends a broadcast command from the PC host computer. The broadcast command contains minute and second information for a timing interval. Considering the time required for wireless transmission, the timing interval should be reasonable and accurate. When each test node receives the command, it starts time synchronization. At this time, the time synchronization module continuously sends ZDA messages to the serial port, and the microcontroller receives and parses the messages. When the parsed minute and second information matches the timing interval, the test node starts pre-acquisition and simultaneously starts a timer to count high-precision pulses.

[0090] Specifically, before counting, the pulse is first configured as a 10MHz high-precision pulse. The timer divides the prescaler by 10 to generate a highly accurate 1MHz pulse waveform. The timer continuously performs rising edge counting operations on the 1MHz pulse. When the value set by the automatic reload register is reached, a timer interrupt is generated and the number of interrupts is recorded.

[0091] In step S3 of the embodiment of the present application, when the shock wave signal formal collection is completed, the UTC time and the pulse number counting time are stored, and the time information of each test node collected is assigned;

[0092] The pulse number counting time is the time corresponding to the pulse number from the timing time to the end of the formal collection time triggered after the explosion, which is expressed as:

[0093] τ=ARR*COUNT+CNT

[0094] In the formula, τ represents the time corresponding to the recorded pulse number, ARR represents the value set by the automatic reload register, COUNT is the number of timer interrupts, and CNT is the value of the counter.

[0095] Specifically, in the present embodiment, when the pre-collection voltage is greater than a certain threshold, the formal collection is triggered, at which time the timer stops counting, and after the formal collection is completed, the time and the counting time are stored, and the time information of each data point collected is assigned. This method can accurately realize the pulse number from the timing time to the end of the formal collection time triggered after the explosion, so as to derive the time of the process according to the above formula, calculate the time of each data point according to the timing UTC time and τ, and the time synchronization accuracy can reach 2 μs.

[0096] Step S4 of the embodiment of the present application comprises the following steps:

[0097] S41, sending a data return instruction to each test node by a PC host computer;

[0098] The return instruction has the respective information of the timing time;

[0099] S42, when the timing time arrives, starting the timer to count the pulse number;

[0100] S43, when the timer of each test node counts to the set pulse number, the collected shock wave signals are transmitted to the PC host computer in turn;

[0101] The set pulse number of each test node is set according to its own number and communication time.

[0102] Specifically, in actual explosion, as many shock wave overpressure test nodes as possible are arranged around the explosion center, so as to comprehensively and finely reflect the shock wave propagation characteristics and the power size at different distances. The number of arrangement may even reach hundreds. When the test personnel sends a broadcast instruction through the LORA host of the host computer end, each test node slave can receive the instruction and respond quickly. However, when all the test nodes complete the collection and send data to the LORA host of the host computer end at the same time, the data in the same channel will be chaotic.

[0103] Therefore, the time-slice transmission technology is used in the embodiment to transmit the collected data, which means that the host sends broadcast instructions to multiple slaves, and each slave synchronizes according to its local time after receiving the instruction, and then uploads according to the order of its node number, so as to realize one-to-many sending and many-to-one receiving. This method greatly shortens the data transmission time and can realize the real-time performance of data transmission.

[0104] In the embodiment of the application, for the storage of the collected data, in step S3, the storage module uses the negative delay trigger technology to manage the storage area in partitions, and uses double DMA interrupts to complete data migration and trigger identification; wherein the storage partitions include a threshold data area, a pre-collected data area, a DMA data cache area and an official collected data area.

[0105] As shown in Figure 6 In the embodiment, SDRAM memory is used as the storage module, and the capacity is 32 MB. The storage area is managed in partitions, and the official collected data area can record up to 5 seconds of storage time.

[0106] Effective and reliable triggering is directly related to the time of collection. Currently, the triggering is mainly line break triggering and internal triggering. The line break triggering means that all test nodes are connected through cables, and the signal line is broken at the moment of explosion, and the test nodes collect data at the same time. The disadvantages are: (1) different distances of test nodes cause inconsistent time of receiving the line break signal due to the length of the cable; (2) each explosion test needs to be rewired. The internal triggering means that the collection and storage are triggered when the collected pressure is greater than the set threshold, which overcomes the disadvantages of line break triggering but faces the loss of data before the threshold.

[0107] On this basis, the test system in the embodiment selects the negative delay trigger technology, manages the SDRAM storage area in partitions, and uses double DMA interrupts to complete data migration and trigger identification, so as to make the explosion triggering reliable and the data complete and effective.

[0108] The data collected in the half-completion interrupt is shown in Figure 7 The data collected in the full-completion interrupt is shown in Figure 8

[0109] A pulse signal waveform with a rise time of 5.00us is collected by using the delay internal trigger partition storage technology, as shown in Figure 9 ​As shown. By collecting data, it is found that when the output key of the signal generator is not pressed, the signal is pre-collected, at this time, the trigger threshold is not reached; when the output of the signal generator is pressed, the signal generator will have an early rising process in order to make the first pulse signal quickly rise to a larger voltage, at this time, the trigger threshold is not reached; when the first pulse signal arrives, the test system is effectively triggered, and the rising time is recorded as 1.875us, and the trigger, collection and storage can be completed in a very short rising time. In order to verify the accuracy and effectiveness of the data, a 350MHz oscilloscope is connected in the same way, and the output waveform after the output key of the signal generator is pressed is recorded by using the capture and storage function of the oscilloscope, as shown in Figure 10 The rising time of the pulse signal generated by the high-standard signal generator is rapid, which maximally simulates the shock wave test, and provides a good experimental basis for the later explosion test.

[0110] The principles and implementation manners of the present application are described by using specific embodiments in the present application, and the above embodiment descriptions are only used to help understand the method of the present application and its core idea; meanwhile, for the general technical personnel in the art, according to the idea of the present application, the specific implementation manners and application ranges can be changed, and the above descriptions should not be understood as the limitation of the present application.

[0111] The person skilled in the art will realize that the embodiments described herein are used to help the reader understand the principles of the present application, and should be understood as the protection scope of the present application not being limited to such specific descriptions and embodiments. The person skilled in the art can make various other specific modifications and combinations according to the technical inspirations disclosed in the present application without departing from the essence of the present application, and these modifications and combinations are still within the protection scope of the present application.

Claims

1. A wireless shock wave overpressure test method based on synchronous timing, characterized in that, The method comprises the following steps: S1, test preparation: arranging test nodes around the explosion center, starting each test node, and protecting each test node by using a protective partition; S2, test start: remotely controlling each test node, including starting time service and starting pre-acquisition; According to the set pre-acquisition start condition, pre-acquisition of voltage is performed, and a timer is started to perform high-precision pulse counting at the same time; S3, test data acquisition and storage: when the pre-acquired voltage is greater than a set threshold, shock wave signals are triggered to be formally acquired and stored in a storage module, and the timer is stopped at the same time; S4, test data return: using a time slice transmission technology based on synchronous timing to return the shock wave signals acquired by each test node; S5, test system recovery: processing and analyzing the returned data by using a PC host computer to complete the overpressure test.

2. The wireless shock wave overpressure test method of claim 1, wherein, The step S2 comprises the following sub-steps: S21, sending a broadcast pre-acquisition instruction to each test node by using the PC host computer; The broadcast instruction comprises second information of a timing time; S22, when each test node receives the broadcast pre-acquisition instruction, starting time service and enabling the time service module to constantly send ZDA messages to the ARM microcontroller through a serial port; S23, receiving and analyzing the ZDA messages by using the ARM microcontroller, and when the analyzed second information is equal to the second information of the timing time, starting pre-acquisition of voltage and starting a timer to perform high-precision pulse counting at the same time.

3. The wireless shock wave overpressure test method of claim 1, wherein, In the step S3, after the formal acquisition of the shock wave signals is completed, UTC time and pulse number counting time are stored, and time information of each test node acquired is assigned; The pulse number counting time is a time corresponding to the pulse number from the timing time to the end of the formal acquisition triggered after the explosion, and is expressed as: In the formula, wherein, t represents the time corresponding to the number of recording pulses, ARR represents the value of the automatic reload register setting, COUNT represents the number of timer interrupts, and CNT represents the value of the counter.

4. The wireless shockwave overpressure test method of claim 1, wherein, In the step S3, the storage module uses a negative delay trigger technology to manage the storage area in zones, and uses double-DMA interruption to complete data moving and trigger identification; The storage zones of the storage module comprise a threshold data zone, a pre-acquisition data zone, a DMA data cache zone, and a formal acquisition data zone.

5. The wireless shockwave overpressure test method of claim 1, wherein, The step S5 comprises the following sub-steps: S41, sending a data return instruction to each test node by using the PC host computer; The return instruction comprises respective second information of a timing time; S42, when the timing time arrives, starting a timer to count the pulse number; S43, when the timer of each test node counts to a set pulse number, transmitting the acquired shock wave signals to the PC host computer in sequence; The set pulse number of each test node is set according to its own number and communication time.

6. A test system based on the method of claim 1-5, characterized in that, The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The shock wave pressure sensor, the overpressure signal preprocessing module and the internal trigger acquisition module are sequentially connected in communication, the internal trigger acquisition module is further connected in communication with the ARM microprocessor and the storage module, the wireless LORA module is connected in communication with the ARM microcontroller, the time module is further connected in communication with the storage module and the ARM microcontroller, and the storage module is further connected in communication with the USB transmission interface.

7. The synchronized timing based wireless shockwave overpressure test system of claim 6, wherein, The shock wave pressure sensor is used for converting the collected external pressure signal into a voltage signal. The overpressure signal preprocessing module is used for preprocessing the voltage signal output by the shock wave pressure sensor. The internal trigger acquisition module is used for converting the preprocessed voltage signal into a digital signal through a digital-analog converter and performing internal trigger discrimination on the collected digital signal. The storage module is used for partitioning storage of system data and collected data. The ARM microcontroller is used for coordinating the work of each module and performing data processing. The wireless LORA module is used for wireless networking of each test node, remote control of the test node and key data of wireless transmission. The time module is used for accepting synchronous time information and generating a high-precision pulse. The power management module is used for providing power voltage for each module and sensor and completing charging and discharging of the battery in the test node.

8. The synchronized timing based wireless shockwave overpressure test system of claim 7, wherein, In the internal trigger acquisition module, when the collected digital signal is greater than a set voltage threshold, formal collection is triggered, and the shock wave signal is collected.

9. The synchronized timing based wireless shockwave overpressure test system of claim 7, wherein, The storage partition of the storage module includes a threshold data area, a pre-collection data area, a DMA data cache area and a formal collection data area. In each storage partition, complete shock wave signal data is stored in the form of a Fattfs file system, and the stored data file is transmitted in the form of USB communication.

10. The synchronized timing based wireless shockwave overpressure test system of claim 6, wherein, The test nodes are distributed in several layers around the explosion center in a ring shape and are connected with the PC host computer through the wireless LORA module.

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