CN113630286B - Ultra-short wave communication network IEMI effect test platform and test method - Google Patents
Ultra-short wave communication network IEMI effect test platform and test method Download PDFInfo
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Abstract
The invention relates to an ultra-short wave communication network IEMI effect test platform and a test method, and aims to solve the technical problems that the existing research on the effect of a wireless communication system mainly stays at the levels of equipment level, component level, device level and the like, and the comprehensive effect evaluation research is not developed aiming at the network level. The test platform comprises a control terminal, an optical switch, a pulse current monitoring probe, an electric field monitoring probe and a plurality of communication nodes; the control terminal and the optical switch are placed in the shielding room; the pulse current monitoring probe, the electric field monitoring probe and all communication nodes are placed in an IEMI electromagnetic interference test space; the working frequency of the communication node is positioned in an ultrashort wave communication frequency band; each communication node comprises a baseband control board card, a radio frequency transceiver, a node antenna and a power supply module. The test method is carried out by using the test platform.
Description
Technical Field
The invention relates to an ultrashort wave communication network effect test platform and a test method, which are applied to the evaluation of the damage and Interference effect of malicious Electromagnetic Interference (IEMI).
Background
With the rapid development of modern electronic technology, wireless communication systems are sometimes subject to various electronic interference with malicious (IEMI) attacks, such as High Power Microwaves (HPMs), ultra-wideband electromagnetic pulses (UWB-EMPs), high altitude electromagnetic pulses (HEMPs), etc. (see GIRI D V, HOAD R, sabah f. high-power electromagnetic fields on electronic systems [ M ]. LONDON: incident HOUSE,2020: 20-30).
Taking the HEMP as an example, because it has characteristics of high field intensity peak value, wide frequency distribution, etc., it generally enters the radio frequency front end of the device from the antenna port through the antenna coupling of the wireless communication system, and then impacts the electronic devices inside the device, causing the phenomena of communication device failure, dead halt, performance degradation, etc. (refer to the works of peribiwa, chenBin, shilihua. The wireless communication system is in a communication network form of a multi-layer and distributed system architecture, and the distribution distance in a wide area space can reach the span from tens of kilometers to hundreds of kilometers. Since the HEMP has a wide-area distribution characteristic, it can affect all electronic communication devices in hundreds, thousands of kilometers, and due to the widely distributed nature of the communication network and the HEMP, it is difficult to directly make a HEMP effect evaluation of the communication network from a testing perspective. Currently, the research on the effect of wireless communication systems mainly stays at the level of device level, component level and device level, and no research on the comprehensive effect assessment performed at the network level has been found (Coburn W O, Nguyen E, Reyzer R J. high-availability electronic pulse overview assessment of the haris RF-3200transceiver, ADA258347, Adelphi MD: Harry Diamond Labs, Sep.1992.). Therefore, a comprehensive effect test platform capable of reflecting real system and environmental characteristics of the communication network needs to be constructed for a specific wireless communication network application scene in a limited HEMP test space to develop comprehensive evaluation of the network-level effect test.
Disclosure of Invention
The invention aims to solve the technical problems that the existing research on the effect of a wireless communication system mainly stays at the levels of equipment level, component level, device level and the like, and the comprehensive effect evaluation research is not developed aiming at the network level, and provides an ultra-short wave communication network IEMI effect test platform and a test method.
In order to solve the technical problems, the technical solution provided by the invention is as follows:
an ultra-short wave communication network IEMI effect test platform is characterized in that:
the device comprises a control terminal, an optical switch, a pulse current monitoring probe, an electric field monitoring probe and a plurality of communication nodes; the control terminal controls the state and service configuration of the communication node through the optical switch, and monitors and analyzes the performance of the communication network; the parameters related to the node state comprise a node virtual space position coordinate, a network weight and a transceiving state; the service configuration comprises a reliable transmission service, a real-time transmission service and a voice service configuration; the communication network performance comprises network throughput, average data transmission rate, average transmission delay and network service capacity;
the control terminal and the optical switch are placed in the shielding room;
the pulse current monitoring probe, the electric field monitoring probe and all communication nodes are placed in an IEMI electromagnetic interference test space;
the working frequency of the communication node is positioned in an ultrashort wave communication frequency band; each communication node comprises a baseband control board card, a radio frequency transceiver, a node antenna and a power supply module;
the baseband control board card comprises a photoelectric conversion module, an ARM controller and a modulation and demodulation module which are connected in sequence; the ARM controller is an ARM controller comprising a channel simulation module and is used for controlling the radio frequency transceiver and processing baseband data; the channel simulation module is used for controlling the radio frequency transceiver to generate a communication waveform after experiencing a real channel according to the distribution position of the communication nodes;
the radio frequency transceiver is used for wireless transceiving of an ultrashort wave frequency band and comprises a transmitting channel, a receiving channel, a radio frequency switch and a local oscillator; the receiving channel comprises a low noise amplifier and a receiving mixer which are connected in sequence; the other end of the low noise amplifier is connected with a radio frequency switch; the transmitting channel comprises a transmitting mixer, a low-pass filter, a primary power amplifier and a secondary power amplifier which are connected in sequence; the output end of the secondary power amplifier is connected with the radio frequency switch; the local oscillator is used for providing local oscillation frequency for the receiving frequency mixer and the transmitting frequency mixer; the radio frequency switch is used for realizing the switching and selecting function of the receiving and transmitting channel; the radio frequency switch is connected with the node antenna through an impedance matching circuit;
the radio frequency end of the modulation and demodulation module is respectively connected with the output end of the receiving mixer and the input end of the transmitting mixer and is used for realizing the GMSK modulation and demodulation function of data;
the photoelectric conversion module converts the electric signal output by the modulation and demodulation module into an optical signal after passing through the ARM controller and converts the optical signal transmitted by the optical switch into an electric signal to be forwarded to the ARM controller; photoelectric conversion modules of all communication nodes enter a shielding room through optical fibers via a signal interface window between the shielding rooms and are connected to the optical switch;
the input end of the pulse current monitoring probe is connected in series with a node antenna of one of the communication nodes, and the output end of the pulse current monitoring probe is connected with the optical switch through an optical fiber and is used for monitoring the tail end of the node antenna to induce a pulse current waveform;
the output end of the electric field monitoring probe is connected with the optical switch through an optical fiber and used for monitoring the waveform of the space electric field.
Furthermore, the device also comprises an oscilloscope arranged in the shielding room; and the oscilloscope is connected with the optical switch and is used for displaying the waveform of the pulse current at the tail end of the node antenna and the waveform of the space electric field.
Furthermore, the working frequency of the communication node is 65MHz, the transmitting power is 10dBm, and the sensitivity is less than or equal to-110 dBm.
Further, the ARM controller adopts a high-performance microcontroller with the model number of STM32F 407.
Further, the modulation and demodulation module adopts an SI4463 chip;
the transmitting mixer and the receiving mixer both adopt SA602 chips;
the local oscillator adopts an SI4133 chip.
Furthermore, the low noise amplifier, the primary power amplifier and the secondary power amplifier all adopt RF3376 chips;
the antenna adopts a bottom-fed ultra-short wave antenna;
the impedance matching unit is an LC circuit;
the radio frequency switch adopts a PIN tube.
Further, all communication nodes are evenly distributed in the IEMI electromagnetic interference test space.
Meanwhile, the invention provides an IEMI effect test method of an ultrashort wave communication network, which is characterized by comprising the following steps of:
1) test set-up
1.1) setting parameters of field uniformity, pulse current waveform and electric field waveform of an IEMI electromagnetic interference test space according to the requirements of a test outline;
1.2) uniformly placing a plurality of communication nodes of which the state and performance indexes meet the requirements of a test outline in an IEMI electromagnetic interference test space;
1.3) all communication nodes adopt a TDMA protocol to construct a fully-connected network, wherein the TDMA protocol comprises return ARQ link control, time slot configuration, initial network access and survivability self-healing; the communication nodes adopt time slot dynamic configuration or time slot reservation configuration to carry out data synchronization and frame header information synchronization;
1.4) node state parameters are set, wherein the node state parameters comprise a node virtual space position coordinate, a network weight and a transceiving state;
1.5) carrying out service configuration, wherein the service configuration comprises reliable transmission service, real-time transmission service and voice service configuration;
1.6) setting communication network performance monitoring indexes, wherein the communication network performance comprises network throughput, average data transmission rate, average transmission delay and network service capacity;
1.7) arranging an electric field monitoring probe in the IEMI electromagnetic interference test space, transmitting the monitored space electric field waveform to an optical switch between shields through an optical fiber, and displaying the waveform on an oscilloscope; installing a pulse current monitoring probe at the tail end of a node antenna of a communication node, transmitting the waveform of the induced pulse current to an optical switch between shields through an optical fiber, and displaying the waveform on an oscilloscope;
1.8) setting parameters of an oscilloscope trigger domain;
2) procedure of the test
2.1) setting emission parameters of an IEMI interference source of an IEMI electromagnetic interference test space according to a 25% xm test level; setting a preset test sending number; m is the maximum test field strength;
2.2) triggering an IEMI interference source to perform irradiation tests on all communication nodes, and storing corresponding response monitoring data and communication network performance monitoring data after the test is finished; the response monitoring data comprises an induction pulse current waveform and a space electric field waveform;
2.3) judging whether the network performance is normal according to the obtained response monitoring data and the communication network performance monitoring data, and if so, directly executing the step 2.4); if not, monitoring the state and performance indexes of all communication nodes, finding out a fault communication node and replacing the fault communication node, and executing the step 2.4);
2.4) repeating the step 2.2) to the step 2.3) until the preset test is finished;
2.5) monitoring the state and performance indexes of all communication nodes, judging whether a fault communication node exists, if not, directly executing the step 2.6), if so, recording IEMI effect data, replacing the fault communication node, and then executing the step 2.6);
2.6) repeating the same operations as in step 2.1) and step 2.5), and carrying out tests in the order of 50% xM, 75% xM and 100% xM;
2.7) judging whether the test of 100% multiplied by M grade is finished or not, if not, returning to the step 2.1); if so, executing step 2.8);
2.8) processing and analyzing the communication network performance monitoring data obtained by the test.
Further, in step 1.3), the step of configuring the slot reservation is as follows:
A1) setting a reservation time; the control terminal transmits a 'data request signal to be sent' to a data link layer, and the data link layer sends the 'data request signal to be sent' to a time slot management module of a communication node i;
A2) the communication node i determines the number of application time slots as m according to the data length and rate requirements in the 'data request signal sending';
A3) the time slot management module of the communication node i inquires whether a slave time slot serial number S exists in a local time slot table k To time slot sequence number S k+m If the m continuous empty time slots do not exist, the control terminal is informed of 'network busy' through a data link layer, and then step A5 is executed); if yes, the time slot management module sends out a time slot reservation application SRR signal and broadcasts the signal;
A4) after other communication nodes receive the 'time slot reservation application SRR signal', the time slot serial number S of the local time slot table is inquired k To time slot sequence number S k+m If all m consecutive time slots are in an idle state, marking the time slots as a state occupied by the communication node i, and then executing step A6); if not, replying a 'time slot reservation invalid SRF signal' to the communication node i, marking the corresponding time slot as an un-reserved state after the time slot management module of the communication node i receives the 'time slot reservation invalid SRF signal', and then returning to the step A3);
A5) repeating the steps A1) to A4) for a plurality of times within the reserved time, and if the communication node i is successfully reserved for the time slot, executing the step A6); otherwise, returning a notification that the communication node i does not reserve to the idle time slot and cannot communicate to the control terminal;
A6) and the communication node i informs the data link layer that the time slot reservation is successful, and the control terminal sends data to the communication node i through the data link layer.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides an IEMI (interference and interference) effect test platform of an ultrashort wave communication network, which is a wireless communication network effect test platform capable of simulating real ultrashort wave wireless communication equipment parameters and network protocol characteristics and truly reflecting spatial distribution characteristics.
2. The ultra-short wave communication network IEMI effect test platform and the test method provided by the invention can simulate the space distribution, channel characteristics and network characteristics of a real ultra-short wave radio station network in a limited space range, provide an effect research test platform close to the equivalence and practicability of real equipment for researching the wide-area electromagnetic pulse attack effect, and solve the problem of effect evaluation of a distributed communication network under the wide-area electromagnetic attack condition.
3. The ultra-short wave communication network IEMI effect test platform and the test method provided by the invention can adjust the weight of the communication nodes, simulate the node difference in an actual communication network, adjust the virtual geographical position of the communication nodes and simulate the characteristics of multipath, delay and the like reflected after signals in actual communication are transmitted through a long-distance ultra-short wave channel through the parameter setting of the control terminal, so that the actual application scene of the actual network can be restored to the maximum extent.
4. The ultra-short wave communication network IEMI effect test platform and the test method provided by the invention can collect performance indexes such as node data processing conditions, network throughput, network delay and the like of all nodes in the network under an IEMI attack condition in real time, and are used for evaluating the IEMI attack effect.
5. The ultra-short wave communication network IEMI effect test platform and the test method provided by the invention realize the reliability of service control and performance monitoring in a photoelectric conversion and optical fiber transmission mode, ensure that a network measurement channel is not interfered by IEMI electromagnetic interference, and ensure the test reliability.
6. The invention provides an ultra-short wave communication network IEMI effect test platform and a test method, provides main flow steps of a network-level IEMI electromagnetic interference effect test, and provides a test method for effectively evaluating the influence of IEMI on the performance of a communication network.
Drawings
FIG. 1 is a schematic structural diagram of an IEMI effect test platform of an ultrashort wave communication network according to the invention;
FIG. 2 is a schematic structural diagram of a communication node in an IEMI effect test platform of an ultrashort wave communication network according to the present invention; in the figure, the computer is a control terminal
Fig. 3 is a schematic flow chart of the ultra-short wave communication network IEMI effect testing method of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
The invention designs an IEMI effect test platform of an ultrashort wave communication network adopting a distributed architecture based on a network communication protocol, equipment working parameters and space distribution characteristics of the ultrashort wave communication network under a real application scene, wherein hardware of the IEMI effect test platform comprises a control terminal (computer), an optical switch and communication nodes, and software comprises a network communication protocol, communication node state and service control software and communication network performance monitoring and analyzing software.
The invention discloses an ultra-short wave communication network IEMI effect test platform, which is shown in figures 1 and 2 and specifically comprises a control terminal, an optical switch, a pulse current monitoring probe, an electric field monitoring probe and a plurality of communication nodes; the control terminal controls the state and the service configuration of the communication node through the optical switch, and monitors and analyzes the performance of the communication network; the parameters related to the node state comprise a node virtual space position coordinate, a network weight and a transceiving state; the service configuration comprises reliable transmission service, real-time transmission service and voice service, and data service configuration capable of simulating various ideal service sending models; the communication network performance comprises network throughput, average data transmission rate, average transmission delay and network service capacity; the control terminal and the optical switch are placed in the shielding room; the pulse current monitoring probe, the electric field monitoring probe and all the communication nodes are placed in an IEMI electromagnetic interference test space.
The working frequency of the communication node is positioned in an ultrashort wave communication frequency band; all communication nodes are uniformly distributed in an IEMI electromagnetic interference test space; each communication node comprises a baseband control board card, a radio frequency transceiver, a node antenna and a power supply module; the baseband control board card comprises a photoelectric conversion module, an ARM controller and a modulation and demodulation module (a baseband end is connected with the ARM controller) which are connected in sequence; the ARM controller is an ARM controller comprising a channel simulation module and is used for controlling the radio frequency transceiver and processing baseband data; the channel simulation module is used for controlling the radio frequency transceiver to generate a communication waveform after the communication waveform is simulated to pass through a real channel according to the distribution positions of the communication nodes, and is used for simulating an actual application scene. The radio frequency transceiver adopts a superheterodyne transceiving structure, is used for wireless transceiving of a ultrashort wave frequency band, simulates the work of an ultrashort wave radio station, and comprises a transmitting channel, a receiving channel, a radio frequency switch and a local oscillator; the receiving channel comprises a low noise amplifier and a receiving mixer which are connected in sequence; the other end of the low noise amplifier is connected with a radio frequency switch; the antenna end of the radio frequency switch is connected with the node antenna through an impedance matching unit (LC circuit); the transmitting channel adopts a two-stage amplification mode and comprises a transmitting mixer, a low-pass filter, a first-stage power amplifier and a second-stage power amplifier which are connected in sequence; the output end of the secondary power amplifier is connected with the radio frequency switch; the local oscillator is used for providing local oscillation frequency for the receiving frequency mixer and the transmitting frequency mixer; the radio frequency switch is used for realizing the switching and selecting function of the receiving and transmitting channel; the radio frequency end of the modulation and demodulation module is respectively connected with the output end of the receiving mixer and the input end of the transmitting mixer and is used for realizing the GMSK modulation and demodulation function of data; the photoelectric conversion module converts the electric signal output by the modulation and demodulation module into an optical signal after passing through the ARM controller and converts the optical signal transmitted by the optical switch into the electric signal; photoelectric conversion modules of all communication nodes enter a shielding room through optical fibers via a signal interface window between the shielding rooms and are connected to the optical switch; the input end of the pulse current monitoring probe is connected in series with a node antenna of one of the communication nodes, and the output end of the pulse current monitoring probe is connected with the optical switch through an optical fiber and is used for monitoring the tail end of the node antenna to induce a pulse current waveform; the output end of the electric field monitoring probe is connected with the optical switch through an optical fiber and used for monitoring the waveform of the space electric field. The oscilloscope is arranged in the shielding room; and the oscilloscope is connected with the optical switch and is used for displaying the waveform of the pulse current at the tail end of the node antenna and the waveform of the space electric field. The ultra-short wave communication network IEMI effect test platform provided by the invention has the following evaluation functions: 1. evaluating the performance change of the whole network when different weight communication nodes in the network are subjected to electromagnetic attack; 2. the robustness of a communication protocol in a network is assessed when a communication node is partially or wholly under electromagnetic attack.
The working frequency of the communication node is 65MHz, the transmitting power is 10dBm, and the sensitivity is less than or equal to-110 dBm. The ARM controller adopts a high-performance microcontroller with the model number of STM32F 407. The modulation and demodulation module adopts an SI4463 chip; the transmitting mixer and the receiving mixer both adopt SA602 chips; the local oscillator adopts an SI4133 chip; the low noise amplifier, the primary power amplifier and the secondary power amplifier all adopt RF3376 chips; the antenna adopts a bottom-fed ultra-short wave antenna; the impedance matching unit is an LC circuit; the radio frequency switch adopts a PIN tube.
The invention also provides an IEMI effect test method of the ultrashort wave communication network, which comprises the following steps:
1) test arrangement
1.1) setting parameters of field uniformity, pulse current waveform and electric field waveform of an IEMI electromagnetic interference test space according to the requirements of a test outline; the area of the IEMI electromagnetic interference test space is 10 meters multiplied by 10 meters; the uniformity of the radiated electric field generated by an IEMI interference source (interference transmitter) in an IEMI electromagnetic interference test space field meets the requirement of 6 dB;
1.2) uniformly placing a plurality of communication nodes with state and performance indexes meeting the requirements of a test outline in an IEMI electromagnetic interference test space to ensure that a tested system is in a normal state;
1.3) all communication nodes adopt a TDMA protocol to construct a fully-connected network (instant time division multiplexing TDMA link layer transmission protocol, which is a fully-connected network topological structure), the number of network access nodes can reach 32, and the TDMA protocol comprises return ARQ link control, time slot configuration, initial network access and anti-destruction self-healing; the communication nodes adopt time slot dynamic configuration or time slot reservation configuration to carry out data synchronization and frame header information synchronization so as to realize network synchronization and synchronization maintenance; and a link layer ACK confirmation mechanism is used, the reliability transmission service requires that the ACK must be successfully confirmed to perform new data transmission, and the real-time transmission service requires that the ACK is sent for 3 times and then the new data transmission is performed no matter whether the ACK is successfully confirmed or not. When transmitting non-voice service, using CRC checking mechanism to ensure that data packet has no error code problem;
the steps of the time slot reservation configuration are as follows:
A1) setting a reservation time; the control terminal transmits a "send data request signal" to the data link layer (dlc layer), and the data link layer sends the "send data request signal" to the time slot management module of the communication node i;
A2) the communication node i determines the number of application time slots as m according to the data length and rate requirements in the 'data request signal sending';
A3) the time slot management module of the communication node i inquires whether a slave time slot serial number S exists in a local time slot table k To time slot sequence number S k+m If the m continuous empty time slots do not exist, the control terminal is informed of 'network busy' through a data link layer, and then step A5 is executed); if yes, the time slot management module sends out a time slot reservation application SRR signal and broadcasts the signal;
A4) after other communication nodes receive the 'time slot reservation application SRR signal', the time slot serial number S of the local time slot table is inquired k To time slot sequence number S k+m If yes, marking the time slots as the state occupied by the communication node i, and then executing step A6); if not, replying a 'time slot reservation invalid SRF signal' to the communication node i, marking the corresponding time slot as an un-reserved state after the time slot management module of the communication node i receives the 'time slot reservation invalid SRF signal', and then returning to the step A3);
A5) repeating the steps A1) to A4) for a plurality of times within the reserved time, and if the communication node i is successfully reserved for the time slot, executing the step A6); otherwise, returning a notification that the communication node i does not reserve to the idle time slot and cannot communicate to the control terminal;
A6) the communication node i informs the data link layer that the time slot reservation is successful, and the control terminal sends data to the communication node i through the data link layer;
1.4) node state parameters are set, wherein the node state parameters comprise a node virtual space position coordinate, a network weight and a receiving and transmitting state, so that the communication network works in a certain assumed distributed scene;
1.5) carrying out service configuration, wherein the service configuration comprises reliable transmission service, real-time transmission service and voice service configuration;
1.6) setting communication network performance monitoring indexes, wherein the communication network performance comprises network throughput, average data transmission rate, average transmission delay and network service capacity, so as to monitor the performance indexes of the communication network in real time;
1.7) arranging a plurality of pulse electric field monitoring probes in the IEMI electromagnetic interference test space, transmitting the monitored space electric field waveform to an optical switch between shields through optical fibers, and displaying the waveform on an oscilloscope; installing a pulse current monitoring probe at the tail end of a node antenna of a communication node to monitor the waveform of a space electric field, transmitting the induced pulse current waveform to an optical switch between shields through an optical fiber, and displaying the induced pulse current waveform on an oscilloscope;
1.8) setting parameters of an oscilloscope trigger domain;
2) procedure of the test
2.1) setting transmission parameters of an IEMI interference source of an IEMI electromagnetic interference test space according to a 25% multiplied by M test grade, and setting preset test transmission times; m is the maximum test field strength;
2.2) triggering an IEMI interference source to perform irradiation tests on all communication nodes, and storing corresponding response monitoring data and communication network performance monitoring data after the test is finished; the response monitoring data comprises an induction pulse current waveform and a space electric field waveform;
2.3) judging whether the network performance is normal according to the obtained response monitoring data and the communication network performance monitoring data, and if so, directly executing the step 2.4); if not, monitoring the state and performance indexes of all communication nodes, finding out a fault communication node and replacing the fault communication node, and executing the step 2.4);
2.4) repeating the steps 2.2) to 2.3) for a plurality of times;
2.5) monitoring the state and performance indexes of all communication nodes, judging whether a fault communication node exists, if not, directly executing the step 2.6), if so, recording IEMI effect data, replacing the fault communication node, and then executing the step 2.6);
2.6) repeating the same operations as in step 2.1) and step 2.5), and carrying out tests in the order of 50% xM, 75% xM and 100% xM;
2.7) judging whether the test of 100% multiplied by M grade is finished or not, if not, returning to the step 2.1); if so, executing step 2.8);
and 2.8) processing and analyzing the communication network performance monitoring data obtained by the test.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and it is obvious for those skilled in the art to modify the specific technical solutions described in the foregoing embodiments, or to substitute part of the technical features, and these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions protected by the present invention.
Claims (9)
1. An ultra-short wave communication network IEMI effect test platform which is characterized in that:
the device comprises a control terminal, an optical switch, a pulse current monitoring probe, an electric field monitoring probe and a plurality of communication nodes; the control terminal controls the state and service configuration of the communication node through the optical switch, and monitors and analyzes the performance of the communication network; the parameters related to the node state comprise a node virtual space position coordinate, a network weight and a transceiving state; the service configuration comprises a reliable transmission service, a real-time transmission service and a voice service configuration; the communication network performance comprises network throughput, average data transmission rate, average transmission delay and network service capacity;
the control terminal and the optical switch are placed in the shielding room;
the pulse current monitoring probe, the electric field monitoring probe and all communication nodes are placed in an IEMI electromagnetic interference test space;
the working frequency of the communication node is positioned in an ultrashort wave communication frequency band; each communication node comprises a baseband control board card, a radio frequency transceiver, a node antenna and a power supply module;
the baseband control board card comprises a photoelectric conversion module, an ARM controller and a modulation and demodulation module which are connected in sequence; the ARM controller is an ARM controller comprising a channel simulation module and is used for controlling the radio frequency transceiver and processing baseband data; the channel simulation module is used for controlling the radio frequency transceiver to generate a communication waveform after experiencing a real channel according to the distribution position of the communication nodes;
the radio frequency transceiver is used for wireless transceiving of an ultrashort wave frequency band and comprises a transmitting channel, a receiving channel, a radio frequency switch and a local oscillator; the receiving channel comprises a low noise amplifier and a receiving mixer which are connected in sequence; the other end of the low noise amplifier is connected with a radio frequency switch; the transmitting channel comprises a transmitting mixer, a low-pass filter, a primary power amplifier and a secondary power amplifier which are connected in sequence; the output end of the secondary power amplifier is connected with the radio frequency switch; the local oscillator is used for providing local oscillation frequency for the receiving frequency mixer and the transmitting frequency mixer; the radio frequency switch is used for realizing the switching and selecting function of the receiving and transmitting channel; the radio frequency switch is connected with the node antenna through an impedance matching circuit;
the radio frequency end of the modulation and demodulation module is respectively connected with the output end of the receiving mixer and the input end of the transmitting mixer and is used for realizing the GMSK modulation and demodulation function of data;
the photoelectric conversion module converts the electric signal output by the modulation and demodulation module into an optical signal after passing through the ARM controller and converts the optical signal transmitted by the optical switch into an electric signal to be forwarded to the ARM controller; photoelectric conversion modules of all communication nodes enter a shielding room through optical fibers via a signal interface window between the shielding rooms and are connected to the optical switch;
the input end of the pulse current monitoring probe is connected in series with a node antenna of one of the communication nodes, and the output end of the pulse current monitoring probe is connected with the optical switch through an optical fiber and is used for monitoring the tail end of the node antenna to induce a pulse current waveform;
the output end of the electric field monitoring probe is connected with the optical switch through an optical fiber and used for monitoring the waveform of the space electric field.
2. The ultrashort wave communication network IEMI effect test platform of claim 1, wherein:
the oscilloscope is arranged in the shielding room; and the oscilloscope is connected with the optical switch and is used for displaying the waveform of the pulse current at the tail end of the node antenna and the waveform of the space electric field.
3. The ultrashort wave communication network IEMI effect test platform of claim 2, wherein:
the working frequency of the communication node is 65MHz, the transmitting power is 10dBm, and the sensitivity is less than or equal to-110 dBm.
4. The ultrashort wave communication network IEMI effect test platform of claim 3, wherein:
the ARM controller adopts a high-performance microcontroller with the model number of STM32F 407.
5. The ultrashort wave communication network IEMI effect test platform of claim 4, wherein:
the modulation and demodulation module adopts an SI4463 chip;
the transmitting mixer and the receiving mixer both adopt SA602 chips;
the local oscillator adopts an SI4133 chip.
6. The ultrashort wave communication network IEMI effect test platform of claim 5, wherein:
the low noise amplifier, the primary power amplifier and the secondary power amplifier all adopt RF3376 chips;
the antenna adopts a bottom feed ultra-short wave antenna;
the impedance matching circuit is an LC circuit;
the radio frequency switch adopts a PIN tube.
7. The ultrashort wave communication network IEMI effect test platform of any one of claims 1 to 6, wherein:
all communication nodes are uniformly distributed in an IEMI electromagnetic interference test space.
8. An IEMI effect test method for an ultrashort wave communication network is characterized by comprising the following steps:
1) test set-up
1.1) setting parameters of field uniformity, pulse current waveform and electric field waveform of an IEMI electromagnetic interference test space according to the requirements of a test outline;
1.2) uniformly placing a plurality of communication nodes of which the state and performance indexes meet the requirements of a test outline in an IEMI electromagnetic interference test space;
1.3) all communication nodes adopt a TDMA protocol to construct a fully-connected network, wherein the TDMA protocol comprises return ARQ link control, time slot configuration, initial network access and survivability self-healing; the communication nodes adopt time slot dynamic configuration or time slot reservation configuration to carry out data synchronization and frame header information synchronization;
1.4) node state parameters are set, wherein the node state parameters comprise a node virtual space position coordinate, a network weight and a transceiving state;
1.5) carrying out service configuration, wherein the service configuration comprises reliable transmission service, real-time transmission service and voice service configuration;
1.6) setting communication network performance monitoring indexes, wherein the communication network performance comprises network throughput, average data transmission rate, average transmission delay and network service capacity;
1.7) arranging an electric field monitoring probe in the IEMI electromagnetic interference test space, transmitting the monitored space electric field waveform to an optical switch between shields through an optical fiber, and displaying the waveform on an oscilloscope; installing a pulse current monitoring probe at the tail end of a node antenna of a communication node, transmitting the waveform of the induced pulse current to an optical switch between shields through an optical fiber, and displaying the waveform on an oscilloscope;
1.8) setting parameters of an oscilloscope trigger domain;
2) procedure of the test
2.1) setting transmission parameters of an IEMI interference source of an IEMI electromagnetic interference test space according to a 25% multiplied by M test grade, and setting preset test transmission times; m is the maximum test field strength;
2.2) triggering an IEMI interference source to perform irradiation tests on all communication nodes, and storing corresponding response monitoring data and communication network performance monitoring data after the test is finished; the response monitoring data comprises an induction pulse current waveform and a space electric field waveform;
2.3) judging whether the network performance is normal according to the obtained response monitoring data and the communication network performance monitoring data, and if so, directly executing the step 2.4); if not, monitoring the state and performance indexes of all communication nodes, finding out a fault communication node and replacing the fault communication node, and executing the step 2.4);
2.4) repeating the step 2.2) to the step 2.3) until the preset test is finished;
2.5) monitoring the state and performance indexes of all communication nodes, judging whether a fault communication node exists, if not, directly executing the step 2.6), if so, recording IEMI effect data, replacing the fault communication node, and then executing the step 2.6);
2.6) repeating the same operations as in step 2.1) and step 2.5), and carrying out tests in the order of 50% xM, 75% xM and 100% xM;
2.7) judging whether the test of 100% multiplied by M grade is finished or not, if not, returning to the step 2.1); if so, executing step 2.8);
and 2.8) processing and analyzing the communication network performance monitoring data obtained by the test.
9. The IEMI effect testing method of the ultrashort wave communication network of claim 8, wherein in step 1.3), the step of timeslot reservation configuration is as follows:
A1) setting a reservation time; the control terminal transmits a 'data request signal to be sent' to a data link layer, and the data link layer sends the 'data request signal to be sent' to a time slot management module of a communication node i;
A2) the communication node i determines the number of application time slots as m according to the data length and rate requirements in the 'data request signal sending';
A3) the time slot management module of the communication node i inquires whether a slave time slot serial number S exists in a local time slot table k To time slot sequence number S k+m If the m continuous empty time slots do not exist, the control terminal is informed of 'network busy' through a data link layer, and then step A5 is executed); if yes, the time slot management module sends out a time slot reservation application SRR signal and broadcasts the signal;
A4) after other communication nodes receive the 'time slot reservation application SRR signal', the time slot serial number S of the local time slot table is inquired k To time slot sequence number S k+m If all m consecutive time slots are in an idle state, marking the time slots as a state occupied by the communication node i, and then executing step A6); if not, replying a 'time slot reservation invalid SRF signal' to the communication node i, marking the corresponding time slot as an un-reserved state after the time slot management module of the communication node i receives the 'time slot reservation invalid SRF signal', and then returning to the step A3);
A5) repeating the steps A1) to A4) for a plurality of times within the reserved time, and if the communication node i is successfully reserved for the time slot, executing the step A6); otherwise, returning a notification that the communication node i does not reserve to the idle time slot and cannot communicate to the control terminal;
A6) and the communication node i informs the data link layer that the time slot reservation is successful, and the control terminal sends data to the communication node i through the data link layer.
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