Wireless shock wave overpressure test system and method based on synchronous timing

Abstract

The invention discloses a wireless shock wave overpressure testing system and method based on synchronous timing, and relates to the technical field of explosive shock wave testing. The test system is composed of a plurality of test nodes, each test node comprises a shock wave pressure sensor, an overpressure signal preprocessing 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, and the shock wave overpressure test system is excellent in performance and comprehensive in function. According to the test system, accurate triggering, high-speed acquisition and complete storage of explosive shock waves are realized by utilizing a delay internal triggering partition storage key technology, remote control, data return and wireless setting are realized by utilizing an LORA wireless technology, and multi-node high-precision time synchronization and multi-node data ordered transmission are realized by utilizing a synchronization technology; the shock wave test problems of low synchronization precision of multiple test points and disordered many-to-one transmission data are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of explosion shock wave testing, and in particular relates to a wireless shock wave overpressure testing system and method based on synchronous timing. Background Art

[0002] Shock waves are the main source of long-range casualties during the warhead explosion process and are the most destructive element. Shock wave overpressure testing is a key technical means for testing the explosive power of warheads and evaluating the damage effect. It 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 electrical measurement method is widely used in shock wave overpressure testing, and the electrical measurement method is divided into the traditional lead electrical measurement method and the storage test method. The traditional lead electrical measurement method is to connect each acquisition device to the computer through a long cable, and the test data is transmitted in real time through the cable. There are problems such as multiple cables interlaced and complicated, difficult on-site layout, and noise interference in cable transmission. The storage test method makes up for the shortcomings of the lead electrical measurement method. The complete shock wave test system is to arrange multiple test nodes around the explosion center. When the explosion occurs, the overpressure signal is collected and stored. After the experiment, the data is uploaded to the computer through wired or wireless methods for data processing and analysis. However, the test systems currently using the storage test method are faced with urgent problems such as low synchronization accuracy between multiple nodes, limited wireless control distance, and chaotic data transmission among multiple nodes, which are not conducive to the control of test nodes and data recovery. With the development of weapons and equipment, the power assessment of weapons and ammunition has placed higher requirements on the test system. The storage test system is gradually becoming intelligent, portable, and comprehensive in function to meet the shock wave overpressure test in more scenarios and even in harsh environments.

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

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

[0006] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is: a wireless shock wave overpressure test system based on synchronous timing, including a plurality of test nodes, each overpressure test node including 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 timing module and a storage module all connected to the power management module;

[0007] The shock wave pressure sensor, overpressure signal preprocessing module and internal trigger acquisition module are communicatively connected in sequence, the internal trigger acquisition module is also communicatively connected with the ARM microprocessor and the storage module respectively, the wireless LORA module is communicatively connected with the ARM microcontroller, the timing module is also communicatively connected with the storage module and the ARM microcontroller respectively, and the storage module is also communicatively connected 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 pre-processed voltage signal into a digital signal through a digital-to-analog converter, and perform internal trigger discrimination on the acquired digital signal;

[0011] The storage module is used to partition and store system data and collected data;

[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 key data of wireless transmission;

[0014] The timing module is used to receive synchronization time information and generate high-precision pulses;

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

[0016] Furthermore, in the internal trigger acquisition module, when the collected digital signal is internally triggered and judged, when it is greater than a set voltage threshold, formal acquisition is triggered to collect the shock wave signal.

[0017] Furthermore, the storage partitions of the storage module include a post-threshold data area, a pre-collected data area, a DMA data buffer area, and a formally collected data area;

[0018] In the formal data collection area, the complete shock wave signal data is stored in the form of a Fattfs file system, and the stored data files are transmitted in the form of USB communication.

[0019] Furthermore, the test nodes are distributed in several layers of rings around the explosion center, and are all connected to the PC host computer through wireless LORA modules.

[0020] A wireless shock wave overpressure testing method comprises the following steps:

[0021] S1. Test preparation: Deploy test nodes around the explosion center, turn on each test node and protect them with protective partitions;

[0022] S2, test start: remote control of each test node, including timing start and pre-collection start;

[0023] Perform voltage pre-collection according to the set pre-collection start conditions, and start the timer at the same time to perform high-precision pulse counting;

[0024] S3, test data collection and storage: when the pre-collection voltage is greater than the set threshold, the shock wave signal is formally collected and stored in the storage module, and the timer count is stopped at the same time;

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

[0026] S5. Test system recovery: Process and analyze the returned data through the PC host computer to complete the overpressure test.

[0027] Furthermore, the step S2 includes the following sub-steps:

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

[0029] The broadcast instruction includes the minute and second information of a timing time;

[0030] S22, when each test node receives the broadcast pre-collection instruction, it turns on the timing and enables the timing module to continuously send ZDA messages to the ARM microcontroller through the serial port;

[0031] S23, receiving and parsing the ZDA message through the ARM microcontroller, when the parsed minute and second information is equal to the minute and second information of the timing time, starting voltage pre-collection and simultaneously starting the timer for high-precision pulse counting.

[0032] Furthermore, in step S3, after the shock wave signal is formally collected, the UTC time and the pulse number counting time are stored, and the time information of each test node collected is assigned;

[0033] Among them, the pulse number counting time is the time corresponding to the number of pulses from the timing time to the end of the formal collection time triggered after the explosion, which is expressed as:

[0034] τ=ARR*COUNT+CNT

[0035] Where, τ represents the time corresponding to the number of recorded pulses, ARR represents the value set by the auto-reload register, COUNT is the number of timer interrupts, and CNT is the value of the counter.

[0036] Furthermore, in step S3, the storage module uses negative delay trigger technology to partition the storage area, and uses dual DMA interrupts to complete data movement and trigger identification;

[0037] The storage partitions of the storage module include a post-threshold data area, a pre-collected data area, a DMA data buffer area, and a formally collected data area.

[0038] Furthermore, the step S5 includes the following sub-steps:

[0039] S41, sending data return instructions to each test node through the PC host computer;

[0040] The return instruction carries the respective information of the timing time;

[0041] S42, when the timing time is reached, start the timer to count the number of pulses;

[0042] S43, when the timer of each test node counts to the set number of pulses, the collected shock wave signals are transmitted to the PC host computer in sequence;

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

[0044] The beneficial effects of the present invention are:

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

[0046] (2) The timing time-slice transmission technology used in this paper enables the test nodes to form a whole through wireless networking. The test personnel can remotely control all nodes from a distance of one kilometer, and each node can return key data in an orderly manner;

[0047] (3) The present invention uses delayed internal trigger partition storage technology to enable the test node to stably and reliably trigger the acquisition and storage, completely record the entire process of explosion shock wave propagation, and ensure data integrity and accuracy;

[0048] Based on the above advantages, the wireless shock wave overpressure testing system and method based on synchronous timing provided by the present invention has excellent performance, comprehensive functions, is more intelligent, safer, and has comprehensive functions. At the same time, it can perform explosion shock wave tests in a variety of indoor and outdoor environments even in harsh environments. It can wirelessly set the working parameter information of the node for different doses or environments, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a structural diagram of the components of each test node in the wireless shock wave overpressure test system based on synchronous timing provided by the present invention.

[0050] Figure 2 A schematic diagram of the layout of each test node in the wireless shock wave overpressure test system provided by the present invention.

[0051] Figure 3 This is a flow chart of the wireless shock wave overpressure testing method provided by the present invention.

[0052] Figure 4 A schematic diagram of the high-precision time synchronization technology based on synchronous timing provided by the present invention.

[0053] Figure 5 A schematic diagram of the time-slice transmission technology based on synchronous timing provided by the present invention.

[0054] Figure 6 This is a schematic diagram of the SDRAM partition storage provided by the present invention.

[0055] Figure 7 This is a schematic diagram of the dual DMA buffer half-complete interrupt data storage provided by the present invention.

[0056] Figure 8 This is a schematic diagram of the dual DMA buffer full completion interrupt data storage provided by the present invention.

[0057] Fig. 9 This is a graph of the pulse simulation experiment results of the signal generator collected by the test system provided by the present invention.

[0058] Fig.10 This is a graph showing the pulse simulation experiment results of the signal generator acquired by a 350MHz oscilloscope provided by the present invention. DETAILED DESCRIPTION

[0059] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0060] The embodiment of the present invention provides a wireless shock wave overpressure testing system based on synchronous timing, including several testing nodes, such as Figure 1As shown, each overpressure test node includes 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 timing module and a storage module, all of which are connected to the power management module;

[0061] The shock wave pressure sensor, overpressure signal preprocessing module and internal trigger acquisition module are communicatively connected in sequence. The internal trigger acquisition module is also communicatively connected with the ARM microprocessor and the storage module respectively. The wireless LORA module is communicatively connected with the ARM microcontroller. The timing module is also communicatively connected with the storage module and the ARM microcontroller respectively. The storage module is also communicatively connected with the USB transmission interface.

[0062] In the embodiment of the present invention, Figure 2 As shown, the test nodes are distributed in several layers around the explosion center, and all communicate with the PC host computer wirelessly through the wireless LORA module. The test nodes in this embodiment are arranged in the area around the explosion center, forming an orderly whole through wireless networking. The test personnel can remotely control the entire test system and transmit data back from a distance of one kilometer.

[0063] In the above-mentioned 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 requires a 24-26V voltage and a 2-10mA constant current source drive to convert 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 DC isolation, filtering, amplification, baseline increase and single-ended to differential processing.

[0065] The internal trigger acquisition module is used to convert the pre-processed voltage signal into a digital signal through a digital-to-analog converter, and perform internal trigger discrimination on the acquired 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 timing module is used to receive synchronized time information and generate high-precision pulses; illustratively, it is used to receive time information from GPS or Beidou.

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

[0071] In the internal trigger acquisition module of this embodiment, when the collected digital signal is internally triggered and judged, when it is greater than the set voltage threshold, formal acquisition is triggered to collect the shock wave signal.

[0072] In the storage module of this embodiment, the storage partitions include a post-threshold data area, a pre-collected data area, a DMA data buffer area, and a formally collected data area;

[0073] In the above-mentioned formal data collection area, the complete shock wave signal data is stored in the form of Fattfs file system, and the stored data files are transmitted in the form of USB communication.

[0074] Based on the structural composition of the above-mentioned wireless shock wave overpressure testing system, the embodiment of the present invention provides a corresponding wireless shock wave overpressure testing method, such as Figure 3 As shown, the following steps are included:

[0075] S1. Test preparation: Deploy test nodes around the explosion center, turn on each test node and protect them with protective partitions;

[0076] S2, test start: remote control of each test node, including timing start and pre-collection start;

[0077] Perform voltage pre-collection according to the set pre-collection start conditions, and start the timer at the same time to perform high-precision pulse counting;

[0078] S3, test data collection and storage: when the pre-collection voltage is greater than the set threshold, the shock wave signal is formally collected and stored in the storage module, and the timer count is stopped at the same time;

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

[0080] S5. Test system recovery: Process and analyze the returned data through the PC host computer to complete the overpressure test.

[0081] In step S1 of this embodiment, during the test preparation stage, each test node is turned on and connected to the sensor, and the test node is protected by a protective partition; the test personnel evacuate to a safe area a kilometer away, and use instructions for remote control, including monitoring the test system status, changing the test system operating parameters, etc.

[0082] Specifically, in this embodiment, each test node is protected to prevent the test node from being damaged due to factors such as high temperature debris.

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

[0084] S21, sending a broadcast pre-collection instruction to each test node through the PC host computer;

[0085] The above broadcast instruction contains the minute and second information of a timing time;

[0086] S22, when each test node receives the broadcast pre-collection instruction, it turns on the timing and enables the timing module to continuously send ZDA messages to the ARM microcontroller through the serial port;

[0087] S23, receiving and parsing the ZDA message through the ARM microcontroller, when the parsed minute and second information is equal to the minute and second information of the timing time, starting voltage pre-collection and simultaneously starting the timer for high-precision pulse counting.

[0088] In this embodiment, the high-precision time synchronization of the test nodes is achieved through the above-mentioned method of synchronizing the timing of each test node. The traditional shock wave test node with internal triggering is adopted. Since there is no wire connection between the nodes, each shock wave test node works independently. When the voltage collected by each node is greater than a certain threshold, the formal collection and storage is triggered. If there is no time synchronization, the stored data can only collect the overpressure waveform, and the data cannot be analyzed and processed under the unified time reference, and the shock wave propagation speed cannot be obtained to construct the overpressure space-time field. Moreover, the shock wave propagation speed is extremely fast, and only microsecond-level time synchronization is practical.

[0089] like Figure 4 As shown, in this embodiment, the test system uses a combination of wireless and timing to remotely control and time the test nodes, and give the test nodes time information; specifically, the synchronization process is: the tester sends a broadcast instruction on the PC host computer, and the broadcast instruction contains a minute and second information of the timing time. Considering that wireless transmission takes time, the timing time should be reasonable and accurate. When each test node receives the instruction, the timing is turned on. At this time, the timing module continuously sends ZDA messages to the serial port, and the microcontroller receives and parses the message. When the minute and second information is equal to the timing time, the test node starts pre-collection and starts the 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 produce a 1MHz pulse waveform with extremely high precision. The timer continuously counts the rising edges of the 1MHz pulse. When the value set by the automatic reload register is reached, a timer interrupt is generated and the number of interruptions is recorded.

[0091] In step S3 of the embodiment of the present invention, after the shock wave signal is formally collected, the UTC time and the pulse number counting time are stored, and the time information of each test node collected is assigned;

[0092] Among them, the pulse number counting time is the time corresponding to the number of pulses 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] Where, τ represents the time corresponding to the number of recorded pulses, ARR represents the value set by the auto-reload register, COUNT is the number of timer interrupts, and CNT is the value of the counter.

[0095] Specifically, in this embodiment, when the pre-collected voltage is greater than a certain threshold, the formal collection is triggered, and the timer stops counting at this time. After the formal collection is completed, the time and counting time are stored, and the time information of each collected data point is assigned. This method can accurately realize the number of pulses from the start of the timing time to the end of the internal triggering of the formal collection time after the explosion occurs, thereby deducing the time of the process according to the above formula, and calculating the time of each data point according to the timing UTC time and τ, and the time synchronization accuracy can reach 2μs.

[0096] Step S4 of the embodiment of the present invention includes the following sub-steps:

[0097] S41, sending data return instructions to each test node through the PC host computer;

[0098] The above-mentioned return instruction carries the respective information of the timing time;

[0099] S42, when the timing time is reached, start the timer to count the number of pulses;

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

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

[0102] Specifically, in an actual explosion, as many shock wave overpressure test nodes as possible will be deployed around the explosion center, so as to fully and finely reflect the shock wave propagation characteristics and the power at different distances. The number of deployments may even be as many as hundreds. When the tester sends a broadcast command through the LORA host on the host side, each test node slave can receive the command and respond quickly. However, when all test nodes complete the collection and send data to the LORA host on the host side at the same time, they will face confusion between the data in the same channel.

[0103] Therefore, in this embodiment, the above-mentioned time-slice transmission technology is used to transmit the collected data back. Time-slice transmission refers to the host sending a one-to-many broadcast instruction. After receiving the instruction, each slave synchronizes according to its own local time. After completion, it uploads according to its own node number order, thereby realizing one send and multiple receive, and multiple send and one receive. This method greatly shortens the time for sending and receiving data, and can achieve real-time data transmission.

[0104] In an embodiment of the present invention, for the storage of collected data, in step S3, the storage module uses negative delay trigger technology to partition the storage area, and uses dual DMA interrupts to complete data movement and trigger identification; wherein the storage partitions include a post-threshold data area, a pre-collected data area, a DMA data cache area, and a formally collected data area.

[0105] like Figure 6 As shown, in this embodiment, an SDRAM memory is used as a storage module with a capacity of 32MB. The storage area is partitioned and managed, wherein the formal data collection area can achieve storage of a recording time of up to 5 seconds.

[0106] Effective and reliable triggering is directly related to the time of data collection. Currently, the main triggers are disconnection triggering and internal triggering. Disconnection triggering means that all test nodes are connected by cables. When the explosion occurs, the signal line is broken and the test nodes collect data at the same time. The disadvantages are: (1) the test nodes at different distances receive disconnection signals at different times due to the cable length; (2) each explosion test requires rewiring. Internal triggering means that when the collected pressure is greater than the set threshold, the collection and storage is triggered. This overcomes the disadvantage of disconnection triggering but faces the loss of data before the threshold.

[0107] On this basis, the test system in this embodiment selects negative delay trigger technology, partitions the SDRAM storage area, and uses dual DMA interrupts to complete data movement and trigger identification, so that the explosion trigger is reliable and the data is complete and effective.

[0108] Among them, the data collected during the semi-complete interruption is as follows: Figure 7 As shown in the figure, the data collected when the interruption is completed is as follows Figure 8 shown.

[0109] Use the delayed internal trigger partition storage technology to collect a pulse signal waveform with a rise time of 5.00us, such as Fig. 9As shown. Through data collection, it is found that: when the output button of the signal generator is not pressed, the signal is pre-collected, and the trigger threshold is not reached at this time; when the output of the signal generator is pressed, in order to make the first pulse signal rise quickly, the signal generator has a large voltage that will rise in advance, and the trigger threshold is not reached at this time; when the first pulse signal comes, the test system is effectively triggered, and the rise time is recorded as 1.875us, which can complete the triggering, collection, and storage within a very short rise time. In order to verify that the data is accurate and valid, a 350MHz oscilloscope is connected in the same way, and its capture and storage function is used to record the output waveform after pressing the output button of the signal generator, as shown below. Fig.10 As shown in the figure, the pulse signal with a fast rise time generated by a high-standard signal generator simulates the shock wave test to the greatest extent, providing a good experimental basis for subsequent explosion tests.

[0110] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

[0111] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A wireless shock wave overpressure testing system based on synchronous timing, characterized in that: It includes several test nodes, each overpressure test node includes 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 timing module and a storage module, all of which are connected to the power management module; The shock wave pressure sensor, overpressure signal preprocessing module and internal trigger acquisition module are communicatively connected in sequence, the internal trigger acquisition module is also communicatively connected with the ARM microprocessor and the storage module respectively, the wireless LORA module is communicatively connected with the ARM microcontroller, the timing module is also communicatively connected with the storage module and the ARM microcontroller respectively, and the storage module is also communicatively connected with the USB transmission interface.

2. The wireless shock wave overpressure testing system based on synchronous timing according to claim 1 is characterized in that: The shock wave pressure sensor is used to convert the collected external pressure signal into a voltage signal; The overpressure signal preprocessing module is used to preprocess the voltage signal output by the shock wave pressure sensor; The internal trigger acquisition module is used to convert the pre-processed voltage signal into a digital signal through a digital-to-analog converter, and perform internal trigger discrimination on the acquired digital signal; The storage module is used to partition and store system data and collected data; The ARM microcontroller is used to coordinate the work of each module and perform 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 timing module is used to receive synchronization time information and generate high-precision pulses; The power management module is used to provide power supply voltage for each module and sensor, and complete the charging and discharging of the battery in the test node.

3. The wireless shock wave overpressure testing system based on synchronous timing according to claim 2 is characterized in that: In the internal trigger acquisition module, when the collected digital signal is internally triggered and judged, if it is greater than the set voltage threshold, formal acquisition is triggered to collect the shock wave signal.

4. The wireless shock wave overpressure testing system based on synchronous timing according to claim 2 is characterized in that: The storage partitions of the storage module include a post-threshold data area, a pre-collected data area, a DMA data buffer area, and a formally collected data area; In each storage partition, the complete shock wave signal data is stored in the form of a Fattfs file system, and the stored data files are transmitted in the form of USB communication.

5. The wireless shock wave overpressure testing system based on synchronous timing according to claim 1 is characterized in that: The test nodes are distributed in several layers of rings around the explosion center, and are all connected to the PC host computer through wireless LORA modules.

6. A wireless shock wave overpressure testing method based on the wireless shock wave overpressure testing system based on synchronous timing according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Test preparation: Deploy test nodes around the explosion center, turn on each test node and protect them with protective partitions; S2, test start: remote control of each test node, including timing start and pre-collection start; Perform voltage pre-collection according to the set pre-collection start conditions, and start the timer at the same time to perform high-precision pulse counting; S3, test data collection and storage: when the pre-collection voltage is greater than the set threshold, the shock wave signal is formally collected and stored in the storage module, and the timer count is stopped at the same time; S4, test data transmission: using time-slice transmission technology based on synchronous timing to transmit the shock wave signal collected by each test node; S5. Test system recovery: Process and analyze the returned data through the PC host computer to complete the overpressure test.

7. The wireless shock wave overpressure testing method according to claim 6, characterized in that: The step S2 comprises the following sub-steps: S21, sending a broadcast pre-collection instruction to each test node through the PC host computer; The broadcast instruction includes the minute and second information of a timing time; S22, when each test node receives the broadcast pre-collection instruction, it turns on the timing and enables the timing module to continuously send ZDA messages to the ARM microcontroller through the serial port; S23, receiving and parsing the ZDA message through the ARM microcontroller, when the parsed minute and second information is equal to the minute and second information of the timing time, starting voltage pre-collection and simultaneously starting the timer for high-precision pulse counting.

8. The wireless shock wave overpressure testing method according to claim 6, characterized in that: In the step S3, after the shock wave signal is formally collected, the UTC time and the pulse number counting time are stored, and the time information of each test node collected is assigned; Among them, the pulse number counting time is the time corresponding to the number of pulses from the timing time to the end of the formal collection time triggered after the explosion, which is expressed as: τ=ARR*COUNT+CNT Where, τ represents the time corresponding to the number of recorded pulses, ARR represents the value set by the auto-reload register, COUNT is the number of timer interrupts, and CNT is the value of the counter.

9. The wireless shock wave overpressure testing method according to claim 6, characterized in that: In step S3, the storage module uses negative delay trigger technology to partition the storage area, and uses dual DMA interrupts to complete data movement and trigger identification; The storage partitions of the storage module include a post-threshold data area, a pre-collected data area, a DMA data buffer area, and a formally collected data area.

10. The wireless shock wave overpressure testing method according to claim 6, characterized in that: The step S5 comprises the following sub-steps: S41, sending data return instructions to each test node through the PC host computer; The return instruction carries the respective information of the timing time; S42, when the timing time is reached, start the timer to count the number of pulses; S43, when the timer of each test node counts to the set number of pulses, the collected shock wave signals are transmitted 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.

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