阅读说明：本技术 一种冲击波威力测试系统、方法、可存储介质 (Shock wave power testing system and method and storage medium ) 是由 吕中杰 段卓平 盖峰 朱学亮 张连生 于 2021-10-13 设计创作，主要内容包括：本发明公开了一种冲击波威力测试系统、方法、可存储介质,涉及无线通信领域。本发明包括：采集存储模块用于测试节点爆炸冲击波数据的采集和存储工作；控制终端模块用于监控所述采集存储模块的工作状态,完成工作参数配置以及试验数据的显示工作；传输模块包括基站和收发端天线,所述基站与所述收发端天线无线连接,用于完成所述采集存储模块和控制终端模块之间的数据传输。本发明满足远程监控和数据传输要求,有效地提升了工作效率,具有良好的应用前景。(The invention discloses a system and a method for testing the power of a shock wave and a storable medium, and relates to the field of wireless communication. The invention comprises the following steps: the acquisition and storage module is used for acquiring and storing the data of the node explosion shock waves; the control terminal module is used for monitoring the working state of the acquisition and storage module and finishing the working parameter configuration and the test data display work; the transmission module comprises a base station and a receiving and transmitting terminal antenna, wherein the base station is wirelessly connected with the receiving and transmitting terminal antenna and is used for completing data transmission between the acquisition and storage module and the control terminal module. The invention meets the requirements of remote monitoring and data transmission, effectively improves the working efficiency and has good application prospect.)

1. A shockwave power testing system, comprising:

the acquisition and storage module is used for acquiring and storing the data of the node explosion shock waves;

the control terminal module is used for monitoring the working state of the acquisition and storage module and finishing the working parameter configuration and the display work of the test node explosion shock wave data;

the transmission module comprises a base station and a receiving and transmitting terminal antenna, wherein the base station is wirelessly connected with the receiving and transmitting terminal antenna and is used for completing data transmission between the acquisition and storage module and the control terminal module.

2. The shockwave power testing system of claim 1, wherein the control terminal module comprises an upper computer, and the upper computer selects an IP address to realize 4G wireless communication connection between the control terminal module and the acquisition and storage module.

3. A shockwave power testing system according to claim 1, wherein said control terminal module is provided with a wireless transmission process uncertainty model:

the packet loss rate Plr of the shock wave data in the wireless transmission process is used as the packet loss rate of the test system, the error rate Ber of the shock wave data in the wireless transmission process is used as the error rate of the test system, and the average value of the total packet number of the test data is used as the total packet number n of the transmission data.

4. The shockwave power testing system of claim 1, wherein said collection and storage module comprises a plurality of testing nodes, each of said testing nodes is provided with a digital recorder, said digital recorder is embedded with a mini-type photoelectric converter, and each of said testing nodes is connected by an optical fiber.

5. The system according to claim 1, wherein an antenna element is disposed in the antenna at the transceiving end, and the antenna element is connected to the Tx/Rx pin of the CPE module.

6. The system of claim 1, wherein the transceiver antenna uses a frequency band centered at 635 MHz.

7. The system of claim 1, wherein the pattern of the transceiver antenna is "apple-shaped", the pattern has an out-of-roundness of 4.5dB, and the gap direction of the 3/4 ring is the maximum gain direction.

8. A method for testing the power of a shock wave is characterized by comprising the following steps:

acquiring explosion shock wave data of the collected test nodes by the data transmission terminal;

the data transmission terminal transmits the explosion shock wave data of the test node to the control terminal;

and the data transmission terminal receives the test node explosion shock wave data processed by the control terminal and transmits the data to the upper computer.

9. A computer storage medium, characterized in that the computer storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the shockwave power testing method as claimed in claim 8.

Technical Field

The invention relates to the field of wireless communication, in particular to a shock wave power testing system and method and a storage medium.

Background

The 'accurate guidance' and 'efficient damage' are basic elements forming modern weapons, and the explosive shock wave is an important basis for measuring the weapon performance and representing the damage power. With the development of the times, the high-efficiency damage assessment of weapon ammunition puts higher requirements on the shock wave testing technology, and how to carry out the shock wave test efficiently, accurately and safely is of great importance. For the explosion shock wave test, a lead wire electrical test method and a storage test method are generally adopted at present. The lead wire electric measurement method can monitor the field test equipment through the control terminal, but the cable layout work is complex, and the external environment can influence the transmission signal through the long cable. With the rapid development of wireless communication technology, a wireless storage type test system based on ZigBee, WLAN and WiFi technology appears, convenience is brought to field arrangement and the like, but the problems of low transmission rate, difficult antenna survival, potential data safety hazards and the like are also exposed, and the signal coverage range of the wireless storage type test system is not suitable for testing the shock wave overpressure field in a large area.

Disclosure of Invention

In view of the above, the present invention provides a system and a method for testing the force of a shock wave, and a storage medium.

In order to achieve the purpose, the invention adopts the following technical scheme:

a shockwave power testing system comprising:

the acquisition and storage module is used for acquiring and storing the data of the node explosion shock waves;

the control terminal module is used for monitoring the working state of the acquisition and storage module and finishing the working parameter configuration and the display work of the test node explosion shock wave data;

the transmission module comprises a base station and a receiving and transmitting terminal antenna, wherein the base station is wirelessly connected with the receiving and transmitting terminal antenna and is used for completing data transmission between the acquisition and storage module and the control terminal module.

Optionally, the control terminal module is composed of an upper computer, and the upper computer selects an IP address to realize wireless communication connection between the control terminal module and the acquisition and storage module.

Optionally, the control terminal module is provided with a wireless transmission process uncertainty model:

the packet loss rate Plr of the shock wave data in the wireless transmission process is used as the packet loss rate of the test system, the error rate Ber of the shock wave data in the wireless transmission process is used as the error rate of the test system, and the average value of the total packet number of the test data is used as the total packet number n of the transmission data.

Optionally, the acquisition and storage module comprises a plurality of test nodes, the test nodes are provided with digital recorders, the digital recorders are embedded and provided with mini photoelectric converters, and the test nodes are connected through optical fibers.

Optionally, an antenna element is disposed in the antenna at the transceiving end, and the element is connected to a Tx/Rx pin of the CPE module.

Optionally, the transceiver antenna uses a frequency band with 635MHz as a center.

Optionally, the directional pattern of the transmitting and receiving end antenna is "apple-shaped", the out-of-roundness of the directional pattern is 4.5dB, and the gap direction of the 3/4 circular ring is the direction with the largest gain.

A method for testing the power of a shock wave comprises the following steps:

acquiring explosion shock wave data of the collected test nodes by the data transmission terminal;

the data transmission terminal transmits the explosion shock wave data of the test node to the control terminal;

and the data transmission terminal receives the test node explosion shock wave data processed by the control terminal and transmits the data to the upper computer.

A computer storage medium, characterized in that the computer storage medium has stored thereon a computer program for implementing the steps of the shockwave power testing method when being executed by a processor.

According to the technical scheme, compared with the prior art, the invention discloses a shock wave power testing system and provides an implementation method of an embedded optical fiber synchronous mutual triggering subsystem. And performing a network performance test and a TNT (trinitrotoluene) explosion test on the test system, wherein the obtained shock wave test data is in good agreement with a theoretical calculation result. And analyzing through the established uncertainty model, and giving a quantitative evaluation result of the test system. The test results and theoretical analysis show that the test system has real and accurate test data and stable and reliable data transmission, meets the requirements of remote monitoring and data transmission, effectively improves the working efficiency and has good application prospect.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of an embedded synchronous mutual triggering technique according to the present invention;

FIG. 3 is a schematic diagram of the host computer software of the test system of the present invention;

FIG. 4 is a schematic layout diagram of the experimental facility according to the present invention;

FIG. 5 is a schematic diagram of a test site layout according to the present invention;

FIG. 6 is a test system transfer model of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention discloses a shock wave power testing system, which comprises:

the acquisition and storage module is used for acquiring and storing the data of the node explosion shock waves;

the control terminal module is used for monitoring the working state of the acquisition and storage module and finishing the working parameter configuration and the test data display work;

the transmission module comprises a base station and a receiving and transmitting end antenna, wherein the base station is wirelessly connected with the receiving and transmitting end antenna and is used for completing data transmission between the acquisition and storage module and the control terminal module.

The acquisition and storage module comprises a plurality of test nodes, each test node is provided with a digital recorder, the digital recorders are embedded with mini photoelectric converters, and the test nodes are connected through optical fibers; an antenna oscillator is arranged in the antenna of the transceiving end, and the oscillator is connected with a Tx/Rx pin of the CPE module; the transmitting and receiving end antenna uses a frequency band with 635MHz as a center. The directional diagram of the receiving and transmitting end antenna is apple-shaped, the out-of-roundness of the directional diagram is 4.5dB, and the gap direction of the 3/4 circular ring is the maximum gain direction.

In this embodiment, the 4G wireless communication-based shock wave power test system is a multi-parameter comprehensive test system suitable for a large field area, a long distance and multiple points, and the system principle is as shown in fig. 1, and mainly comprises 3 modules of acquisition and storage, 4G transmission and terminal control.

The acquisition and storage module is an array consisting of a plurality of digital pressure recorders capable of working independently, and is used for completing data acquisition and storage work of the explosion shock waves; the 4G transmission module mainly comprises a base station and a receiving and transmitting end antenna, and is used for completing the transmission work of system state data, control command data and test acquisition data between a test node and a control terminal upper computer; the control terminal mainly comprises an upper computer and is used for finishing the work of monitoring the state of the test equipment, configuring working parameters and displaying test data.

The working process is as follows:

1) testing equipment such as a digital pressure sensor, a 4G communication base station, a control terminal upper computer and the like are arranged and started on an explosion experiment field according to a specific rule;

2) selecting an IP address at an upper computer end to realize 4G wireless communication connection between a control end and a digital pressure recorder, and then configuring system working parameters according to test working conditions;

3) and the digital pressure recorder enters a to-be-triggered state after receiving a to-be-triggered instruction of the upper computer, and circularly stores the acquired data into the SDRAM. When the acquisition pressure of the recorder is greater than the trigger pressure threshold value, the system triggers and stores the acquired data and SDRAM data into a flash, and after the acquisition is finished, the recorder enters a data return waiting timing state and monitors the instruction of an upper computer;

4) the digital pressure recorder starts to remotely transmit experimental data through 4G wireless communication after reaching data return waiting time or receiving a data return instruction of an upper computer;

and after the data return is finished, the digital pressure recorder enters the to-be-triggered state again, and the instruction of the upper computer is monitored continuously.

2 Key technology

2.14G wireless communication system

2.1.1OFDM techniques

The OFDM (orthogonal frequency division multiplexing) technology means that subcarriers are orthogonal to each other, and frequency spectrums can be overlapped with each other after spread spectrum modulation, so that mutual interference between the subcarriers is weakened. The technology mainly adopts a wireless transmission mode, utilizes the characteristics of orthogonal frequency division multiplexing, simultaneously adopts a HomePlug technology to divide channels, and transmits each divided sub-channel respectively, so that the data transmission rate and the frequency spectrum utilization rate can be integrally improved, and the anti-fading and anti-interference performance is obvious [7 ].

2.1.2MIMO techniques

The MIMO (multiple input and multiple output) technology is to reduce the occurrence of channel fading problem by controlling multiple antennas, and to reuse existing multipath propagation and random fading with high efficiency, so as to achieve better transmission speed and efficiency. The multiple parallel antenna space channels can simultaneously transmit and receive, and the requirements of synchronous, high-speed and stable data transmission and remote control of different shock wave overpressure test nodes in a wide-area explosion field complex environment can be met.

2.2 Embedded Multi-node synchronous mutual triggering technology

The common shockwave power test system uses a cable or a twisted pair as a connecting line and a synchronous trigger line between different test nodes, which inevitably introduces electromagnetic interference in an electromagnetic environment with complex explosion fields. Especially, for field experiment of large equivalent ammunition, the number of measuring points is large, the test range is wide, the circuit layout is complex, the length of the lead is increased sharply, and the real shock wave signal can be even submerged by serious electromagnetic interference [9 ]. The common external optical fiber synchronous triggering device increases the difficulty of equipment layout and has higher requirements on the number of channels. The 4G wireless communication-based shock wave power testing system is provided with mini-type photoelectric converters embedded in the digital pressure recorder of each testing node, and the mini-type photoelectric converters are connected with each other by optical fibers to realize the multi-node synchronous mutual triggering function, so that the interference of the complex electromagnetic environment of an explosion field on shock wave overpressure signals is effectively weakened.

As shown in fig. 2, an embedded multi-node synchronous mutual triggering technology based on photoelectric conversion is described by taking a 6-node shockwave overpressure test recorder array as an example. Wherein 1 and 2 are different numbers of shock wave overpressure testing nodes, 1-2 represent the optical fiber connection between the shock wave overpressure testing nodes 1 and 2, and the rest is analogized. When the shock wave overpressure signal is firstly collected by the shock wave overpressure testing node 3 closest to the explosion source to trigger, the node 3 transmits a trigger signal to the node 2 and the node 6 through the embedded mini-type photoelectric converter. The synchronous trigger signal is transmitted from the node 2 to the node 1 and the node 5, and simultaneously transmitted from the node 6 to the node 5, obviously, the node 5 receives two synchronous trigger signals from the node 2 and the node 6 in sequence. Similarly, node 4 receives two synchronization triggers from node 1 and node 5, respectively. To avoid duplicate reception by the same node

The trigger signal affects the data acquisition work, and each node only reacts to the synchronous trigger signal received for the first time in each experiment. The optical fibers 2-5 in the figure seem redundant, so that the problem that shock wave overpressure test nodes cannot be synchronously triggered due to the blockage of individual optical fiber lines is avoided, and the synchronous triggering fault tolerance rate of the whole digital pressure recorder array is improved.

Test verification

In order to verify the working performance of the test system, a network performance test and a TNT charge explosion test are developed.

Network performance test

The network performance test is to carry out remote control and file transmission test on the digital pressure recorder by a control terminal upper computer through a professional network debugging software tool so as to simulate data sending and receiving work between the control terminal and a test site test node. The influence of parameters such as the type of a base station antenna, the height of the base station antenna, the transmission distance between the base station and a recorder, the type of the recorder antenna and the like on the data transmission rate and reliability of the 4G wireless communication-based shock wave overpressure testing system is researched.

The network performance test process mainly follows the following steps:

firstly, arranging a 4G communication base station and a digital pressure recorder at a certain interval, and respectively connecting the base station and the digital pressure recorder with a computer through Ethernet cables, wherein experimental equipment is arranged as shown in FIG. 5;

selecting an IP address at the upper computer of the control terminal to realize 4G wireless communication connection between the upper computer and the digital pressure recorder, and adjusting the azimuth angle of an antenna to enable the signal intensity to reach the best;

testing ping operation delay, performing a bag filling test by using a gperf tool, and recording the maximum bag filling rate;

fourthly, file transmission testing is carried out by using a FileZilla tool, and meanwhile, rate testing is carried out by using a base station MCSim-6614-B and DUMeter software;

using a specialized tool Wireshark to grab the packet for error rate analysis.

2 types of directional antennas and omnidirectional antennas are arranged on base station antennas in a network test of a 4G wireless communication-based shock wave power test system; the height of the base station antenna has 2 working conditions of 3m and 8m (relative to the height of the upper surface of the digital pressure recorder); the digital pressure recorder has 2 types of large antennas and small antennas (for simulating the actual measurement requirement under the real explosion environment, the recorder is arranged in a ground surface embedded manner, and the upper surface of the recorder is ensured to be flush with the ground surface); the horizontal distance between the base station antenna and the recorder adopts 2 arrangement states of 500m and 1000 m; in summary, the test has 2^4 ^ 16 working conditions, and the relevant test results are shown in table 1.

Table 1 network performance test experimental results

The above test results were analyzed in combination to draw the following conclusions:

firstly, comparing experiments 1 and 5, 2 and 6, 3 and 7, 9 and 13, 10 and 14, 12 and 16 respectively under the same condition by a networked shock wave overpressure testing system based on 4G wireless transmission, so that the performance of a directional antenna of a base station is superior to that of an omnidirectional antenna; comparing tests 1 and 9, 2 and 10, 3 and 11, 5 and 13, 6 and 14, 7 and 15, 8 and 16 respectively, it can be seen that the base station antenna has a hanging height of 8 meters better than 3 meters; comparing experiments 1 and 3, 5 and 7, 6 and 8, and 9, 10 and 12, 13 and 15, 14 and 16, respectively, it can be seen that the base station-recorder distance 500 meters is better than 1000 meters; comparing experiments 1 and 2, 5 and 6, 7 and 8, 9 and 10, 13 and 14, 15 and 16 respectively, it can be seen that the terminal has better performance for the large antenna than the small antenna.

Compared with experiments 11 and 12, the FTP uplink rates are respectively 5.43M/s and 4.47M/s, the FTP downlink rates are respectively 4.69M/s and 2.45M/s, the maximum uplink rates of the irrigation package are respectively 6.99M/s and 5.28M/s when a small antenna and a large antenna are selected as the recorders under the same other conditions, and the performance of the small antenna of the terminal is superior to that of the large antenna;

compared with experiments 11 and 15, the FTP uplink rates are respectively 5.43M/s and 4.87M/s when the base station adopts the omnidirectional antenna and the directional antenna under the same other conditions, the maximum uplink rates of the irrigation packets are respectively 6.99M/s and 4.26M/s, and the situation that the performance of the omnidirectional antenna is superior to that of the directional antenna occurs;

the analysis shows that the reason is caused by manually adjusting the pitching angle of the omnidirectional antenna when the 11 th group of experiments are carried out, and therefore, the pitching angle of the omnidirectional antenna relative to the recorder has a significant influence on the performance of the shock wave overpressure testing system based on 4G wireless communication.

In 16 working condition designs of the experiment, the optimal configuration is experiment 14, a base station selects a directional antenna, the height of the base station antenna is 8 meters, the distance between a terminal and a recorder is 500 meters, and the recorder selects a large antenna; under the working condition, the RSRP value received by the recorder is-80 dBm, the ping delay is 40ms, the FTP uplink rate is 20.30M/s, the FTP downlink rate is 15.67M/s, and the maximum uplink rate of the irrigation packet is 20.46M/s.

Under extreme conditions, as shown in test 3, when the base station adopts an omnidirectional antenna, the hanging height of the base station antenna is 3 meters, the distance between the base station and the recorder is 1000 meters, and the recorder selects a small antenna, the RSRP value received by the recorder is-104 dBm; ping delay is 69 ms; the FTP uplink rate is 1.31M/s, the FTP downlink rate is 1.9M/s, the maximum rate of the tunneling packet uplink is 1.52/s, and the wireless transmission rate and the transmission reliability are good.

Because 4G wireless communication contains a hybrid automatic repeat request (HARQ) mechanism, the mechanism combines forward error correction coding (FEC) and automatic repeat request (ARQ), thereby effectively ensuring the accuracy of file transmission, and the error rate of a high layer is verified to be 0.00% through tests without error codes.

TNT explosive loading test

Theoretical calculation formula of overpressure peak value of shock wave

The propagation law of near-earth explosion shock waves is very complex, the propagation law of the shock waves is basically consistent with the propagation law of infinite air explosion at the initial stage of explosion, when the air shock waves reach the ground, the air shock waves are reflected, and different reflection types, namely regular reflection, regular reflection and Mach reflection, are caused due to different human emission angles [10 ].

In the air without limitationDetonation refers to the detonation of an explosive in air without boundaries (or can be considered as being borderless). It is generally accepted that the contrast height of the chargeWhen the following conditions are met, the shock wave is not influenced by a space interface:

in the formula: h is the height (detonation height) of the explosive from the ground (m); omega is TNT loading (kg).

The explosive with the TNT equivalent omega explodes on the soil ground, and when the distance from the explosive core to the test node is r, the theoretical calculation formula of the incident pressure of the air shock wave^[11]Is composed of

In the formula,. DELTA.P₊Is the overpressure value of the shock wave,unit is m/kg^1/3。

When the explosive charge close to the ground is not regarded as infinite air explosion, shock waves contact the ground and are reflected, and if the incidence angle of the shock waves is smaller than the Mach reflection critical angle, regular reflection or normal oblique reflection occurs; mach reflection occurs when the shock wave incidence angle is greater than the mach reflection critical angle. Mach reflection critical angle is related to charge height and charge amount^[12]Mach critical angle of reflectionBy contrast of height of chargeCan be expressed as:

when regular reflection or normal oblique reflection occurs, the wall reflection overpressure is calculated by equation (4), and when mach reflection occurs, the wall reflection overpressure is calculated by equation (5):

in the formula p₀Is the local atmospheric pressure.

Test site layout

To evaluate the consistency of the test data and the reliability of the transmission of the test system, a shock wave test was performed on a static detonation test of a 5.2kgTNT charge. The TNT used in the test consisted of 90% TNT + 10% wax and had a density of 1.53g/cm³The diameter of the grain is 130mm, and the height of the grain is 260 mm. The mass center of the explosive column is 1.5m away from the ground, 12 measuring points are arranged in two paths, the horizontal distance between each measuring point and the explosive center is 4m nearest and 14m farthest, one measuring point is additionally arranged every 2m, and the specific test site is arranged as shown in fig. 5. The No. 1 node and the No. 7 node which are closest to the explosion center are connected through cables, and the rest nodes are all connected through optical fibers.

Shock wave test result of static explosion test

The shock wave power testing system based on 4G wireless communication can effectively capture and record an air shock wave overpressure time-course curve, and shock wave waveforms obtained through the first test and the second test have good consistency for measuring points at different positions in different directions.

The shockwave pressure data recorded by the 4G wireless communication based near-earth explosive shockwave power test system is listed in table 2.4, corresponding data are acquired by all the test nodes, and except that the waveforms obtained by the test nodes 1 and 7 closest to the center of burst have obvious overshoot and burrs, the rest waveforms are normal. The comparative analysis shows that compared with the traditional cable synchronous triggering technology, the embedded optical fiber synchronous mutual triggering technology can effectively avoid electromagnetic interference under the complex electromagnetic environment of an explosion field and completely record the effective information of shock waves. The effective shock wave overpressure peaks are recorded in table 2.

TABLE 2 Table of measured waveform overpressure peak and theoretical calculation data

Comparing the theoretically calculated overpressure peak value and the actually measured overpressure peak value in the table 2, the relative error delta of the two values is controlled within 13%, and good coincidence indicates that the 4G wireless communication-based shock wave power test system is real and reliable in the near-earth explosion shock wave power test.

Uncertainty analysis

In the field of test metrology, uncertainty exists as part of the measurement results, which is used to characterize the dispersion of the measured test values. Different from dynamic measurement errors, the measurement uncertainty is centered on the measured estimated value, reflects the estimation of people on the measured true value within a certain magnitude range, and can quantitatively evaluate the uncertainty calculation method and model

Method for calculating uncertainty of A-type and B-type

(1) A-type uncertainty evaluation method

Under the same condition, carrying out n independent repeated observations on the measured X to obtain an observed value X_i(i ═ 1,2,3, … … n). Average arithmetic valueAs an estimated value of the measured X, a standard uncertainty u of the measured X is calculated based on the Bessel equation method_xAs in formula (6):

wherein n is the number of experiments.

Method for evaluating class B uncertainty

The type B uncertainty is obtained by studying the probability distribution to which the measured quantity may be subjected based on past observations, technical data, or calibration certificates. There are 3 common situations:

a) knowing the interval of possible distributions of the measured values [ x-a, x + a ] and the probability distribution of the measured values within this interval, i.e. the confidence interval a of the measured values and the inclusion factor k are known, the uncertainty of the measured value x is:

b) knowing the measured extended uncertainty u (x)_i) And contains a factor k, the uncertainty of the measurement x is:

c) knowing the measured extension uncertainty u_pAnd a confidence level p, determined to include a factor k according to the distribution to which the measurement is likely to be obeyed, the uncertainty of the measurement x being:

test system uncertainty transfer model

The signal passes in the various modules of the test system, from the input to the output, with a transfer function that can be expressed as F (F)₁,f₂,f₃,……f_n)，f_iIs each transmission unit in the system.

Suppose the input signal of the test system is x₀(t) describing the ideal output y of the signal by a transfer function₀(t) is:

y₀(t)＝x₀(t)·F(f_i),(i＝1,2,……n) (10)

assume that the signal interference error applied to the input of the test system is n, as shown in FIG. 6_x(t) signal interference error acting on the output is represented by n_y(t) signal interference error of the test system itself is represented by e_f(t), then the actual output of the system signal is described by the transfer function as:

y(t)＝(x₀(t)+n_x(t))F(f_i)+n_y(t)+e_f(t) (11)

the system dynamic error described by the transfer function is then:

e(t)＝y(t)-y₀(t)＝n_x(t)F(f_i)+n_y(t)+e_f(t) (12)

uncertainty analysis is carried out on a transfer model based on the angle of an error source, and n is assumed_x(t) the introduced uncertainty component is u_xThe uncertainty component introduced by the characteristics of the test system is u_F，n_y(t) the introduced uncertainty component is u_yFor series systems, the system synthesis uncertainty u is expressed as a transfer function_system：

For parallel systems, the system synthesis uncertainty u is expressed as a transfer function_syst_emComprises the following steps:

uncertainty calculation model of test system

The uncertainty of the shock wave overpressure testing system mainly comprises uncertainty u introduced by a digital pressure recorder_DPRAnd uncertainty u introduced by data in 4G wireless transmission process_4GTwo aspects are provided.

The digital pressure recorder used in the system is a standardized device independently researched and developed by Beijing university of science and technologyUncertainty u_DPRThe content was found to be 3.98%. The uncertainty introduced by the data in the 4G wireless transmission process indicates the uncertainty introduced by the data packet loss and the error code, and the data packet loss rate and the error code rate are also important indexes for evaluating the wireless transmission performance of the data. The packet loss rate Plr of the shock wave data in the wireless transmission process is used as the packet loss rate of the test system, the error rate Ber of the shock wave data in the wireless transmission process is used as the error rate of the test system, the average value of the total packet number of the test data is used as the total packet number n of the transmission data, and the calculation formula of the uncertainty in the wireless data transmission process can be obtained^[14]：

The error rate can be known to be 0.0% in the test system network test experiment; in the process of packet capturing, 7649 packets exist in each 1 group of data, 1 packet is lost in each 6 groups of data, so the packet loss rate is 2.18 multiplied by 10 < -3 >. The uncertainty of the wireless data transmission process obtained according to the formula is:

uncertainty of synthetic standard of test system

For the whole test system, the uncertainty introduced by the digital pressure recorder and the uncertainty introduced by the data in the 4G wireless transmission process can be logically considered to be parallel, and the uncertainty u of the test system is calculated according to the formula (14)_systemComprises the following steps:

the overall uncertainty of the test system is 4.02%.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.