A method and system for testing the external radio frequency electromagnetic environment of weapon equipment

Abstract

The present application belongs to the technical field of electromagnetic environment effect, and particularly relates to a weapon equipment external radio frequency electromagnetic environment test method and system, which comprises a near-field focusing phased array antenna system, a lifting and rotating mechanism, a field strength measuring system, a SUT response monitoring system, a movable platform, a video monitoring system, a power supply system and a main control system; the near-field focusing phased array antenna system comprises a near-field focusing phased array antenna, a power supply assembly and a temperature control assembly; the field strength measuring system comprises a field strength measuring device and a field strength measuring sensor; the SUT response monitoring system comprises a SUT response monitoring device and a SUT response monitoring sensor; and the video monitoring system comprises a video monitoring sensor and a video monitoring device. The present application realizes 3m near-field beam focusing, takes into account high field strength and large duty ratio, can realize uniform irradiation of a large SUT, overcomes the problem of poor field uniformity in the traditional technology, and effectively saves the test time and maneuverability.

Description

Technical fields:

[0001] This invention belongs to the field of electromagnetic environment effects technology, specifically relating to a method and system for testing the external radio frequency electromagnetic environment of weapon equipment. Background technology:

[0002] The strong electromagnetic radiation fields generated by high-power pulsed transmitters such as shipborne and airborne radars and communication transmitters seriously threaten the combat effectiveness and even the safety of equipment. GJB1389A-2005, "System Electromagnetic Compatibility Requirements," defines the electromagnetic radiation environment generated by such high-power transmitters as the external radio frequency electromagnetic environment and specifies the assessment requirements for the external radio frequency electromagnetic environment of various weapons and equipment. GJB8848-2016, "Test Methods for System Electromagnetic Environment Effects," provides corresponding test methods. According to the standards, some equipment faces extremely harsh external radio frequency electromagnetic environments, especially systems operating under the main beam of shipborne radar, where the peak value of the pulse-modulated radiation field in the S-band can reach tens of thousands of V / m, with a duty cycle greater than 10%. Simultaneously, the field strength fluctuation within the SUT range must not exceed 3 dB, requiring a high degree of field uniformity.

[0003] Current technologies use a single power amplifier and a single antenna to generate the electromagnetic environment. The power output capability of the power amplifier, which meets the duty cycle requirements, is insufficient to meet the field strength output requirements of thousands or even tens of thousands of V / m. On the other hand, the duty cycle of magnetron transmitters capable of outputting field strengths of thousands or tens of thousands of V / m is insufficient to meet the standard requirements. Furthermore, even if a power amplifier with stronger output capability is developed in the future, the limited beamwidth of the antenna will result in poor field uniformity when testing large systems under test (SUTs) at a test distance of 3m, making it difficult to guarantee field uniformity within the SUT scale.

[0004] In conclusion, continuously optimizing electromagnetic environment testing systems has become a key research direction for researchers in this field. Summary of the Invention:

[0005] This invention aims to provide a method and system for testing the external radio frequency electromagnetic environment of weapon equipment, overcoming the problems of existing technologies that make it difficult to simultaneously achieve high field strength and large duty cycle, as well as poor field uniformity.

[0006] To achieve the objectives of this invention, the technical solution provided is: an external radio frequency electromagnetic environment testing system for weapon equipment, comprising a near-field focusing phased array antenna system, a lifting and rotating mechanism, a field strength measurement system, a SUT response monitoring system, a movable platform, a video monitoring system, a power supply system, and a main control system; the near-field focusing phased array antenna system includes a near-field focusing phased array antenna, a power supply component, and a temperature control component; the field strength measurement system includes a field strength measurement device and a field strength measurement sensor; the SUT response monitoring system includes an SUT response monitoring device and an SUT response monitoring sensor; the video monitoring system includes a video monitoring sensor and a video monitoring device;

[0007] The near-field focusing phased array antenna system is connected to the power supply system, the main control system, the video monitoring sensor, the SUT response monitoring device, and the field strength measurement device, respectively. The power supply system and the main control system are connected to the video monitoring sensor, the SUT response monitoring device, and the field strength measurement device, respectively.

[0008] The mobile platform is a mobile cabin, including a control cabin and an antenna cabin. The control cabin has a shielding effectiveness of 60dB and is equipped with a power supply system, a main control system, video monitoring sensors, SUT response monitoring equipment, and field strength measurement equipment. The antenna cabin is equipped with a near-field focusing phased array antenna system.

[0009] Furthermore, the aforementioned near-field focusing phased array antenna system is mounted on a lifting and rotating mechanism.

[0010] Furthermore, the method for generating electromagnetic fields by the aforementioned external radio frequency electromagnetic environment testing system for weapons and equipment is as follows:

[0011] Step 1: Set the frequency, field strength, polarization, and modulation;

[0012] Step 2, Irradiation:

[0013] 2.1 Illumination distance: The aperture distance of the near-field focusing phased array antenna to the test configuration boundary is 3m;

[0014] 2.2 Selection of Irradiation Position: Select at least the front, back, and each side of the SUT within a 360° circle on both the horizontal and vertical planes. Adjust the lifting and rotating mechanism and select the irradiation position according to the antenna beam scanning range to ensure that the field strength change is within 3dB. For the SUT response monitoring sensor, place it outside or at the location of the unshielded cable, align the near-field focusing phased array antenna with it for direct irradiation, and ensure that the field strength change is within 3dB.

[0015] 2.3 Irradiation: By adjusting the lifting and rotating mechanism, the near-field focusing phased array antenna can perform beam scanning on a certain side of the SUT; by moving the container, different sides of the SUT can be irradiated.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] 1. Since the system described in this invention is designed based on spatial power combining technology to design a near-field focusing phased array antenna, and multiple high-output power transmitting components that meet the duty cycle requirements are designed to excite the broadband phased array antenna, a 3m near-field beam focusing is achieved. Therefore, it can simultaneously take into account high field strength and large duty cycle.

[0018] 2. The near-field focusing phased array antenna of the present invention can achieve beam scanning of -30° to 30° in the elevation plane and -30° to 30° in the azimuth plane. Combined with the lifting and rotating mechanism with lifting of 0.8m to 3m, rotation in the -90° to 90° azimuth plane and -30° to 0° elevation, it can achieve beam scanning of -60° to 60° in the azimuth plane and -30° to 30° in the elevation plane, and can achieve uniform irradiation of large SUTs, overcoming the problem of poor field uniformity in traditional technologies.

[0019] 3. The mobile platform is a mobile container, including a separate or integrated control cabin and antenna cabin. The advantage of separate placement is that both can be placed freely according to the terrain during normal operation, and when needed, they can be slid together to expose the near-field focusing phased array antenna for testing. This effectively saves testing time and improves mobility. Attached Figure Description

[0020] Figure 1 This is a diagram of the overall architecture of the present invention;

[0021] Figure 2 This is a schematic diagram of the testing method of the present invention.

[0022] The annotations in the attached figures are explained as follows:

[0023] 1-Near-field focusing phased array antenna system, 1-1-Near-field focusing phased array antenna, 1-2-Power supply assembly,

[0024] 1-3-Temperature control components, 2-Lifting and rotating mechanism, 3-Field strength measurement system, 3-1-Field strength measurement equipment, 3-2-Field strength measurement sensor, 4-SUT response monitoring system, 4-1-SUT response monitoring equipment, 4-2-SUT response monitoring sensor, 5-Mobile platform, 5-1-Control cabin, 5-2-Antenna cabin, 6-Video monitoring system, 6-1-Video monitoring sensor, 6-2-Video monitoring equipment, 7-Power supply system, 8-Main control system. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0026] This invention provides a weapon equipment external radio frequency electromagnetic environment testing system, including a near-field focusing phased array antenna system 1, a lifting and rotating mechanism 2, a field strength measurement system 3, a SUT response monitoring system 4, a movable platform 5, a video monitoring system 6, a power supply system 7, and a main control system 8. The near-field focusing phased array antenna system 1 includes a near-field focusing phased array antenna 1-1, a power supply component 1-2, and a temperature control component 1-3. Designed based on spatial power combining technology, it can achieve near-field beam focusing at a distance of 3m from the antenna array surface and can achieve beam electrical scanning in the elevation plane (-30°~30°) and azimuth plane (-30°~30°). The power supply component 1-2 and the temperature control component 1-3 provide power to the near-field focusing phased array antenna 1-1 and power the corresponding components, respectively. The system achieves temperature control; the field strength measurement system 3 includes a field strength measurement device 3-1 and a field strength measurement sensor 3-2. The field strength measurement sensor 3-2 can receive radiation fields of thousands or even tens of thousands of V / m, convert them into optical signals through a photoelectric conversion device, and transmit them to the field strength measurement device 3-1 through optical fiber to reduce the electromagnetic interference of strong radiation fields on the measurement signal; the SUT response monitoring system 4 includes a SUT response monitoring device 4-1 and a SUT response monitoring sensor 4-2; the video monitoring system 6 includes a video monitoring sensor 6-1 and a video monitoring device 6-2. The video monitoring subsystem 6 is used to perform video monitoring of sensitive devices inside the SUT to assist testers in accurately determining the sensitive status of the sensitive devices;

[0027] The near-field focusing phased array antenna system 1 is connected to the power supply system 7, the main control system 8, the video monitoring sensor 6-1, the SUT response monitoring device 4-1, and the field strength measurement device 3-1, respectively. The power supply system 7 and the main control system 8 are connected to the video monitoring sensor 6-1, the SUT response monitoring device 4-1, and the field strength measurement device 3-1, respectively.

[0028] The mobile platform 5 is a mobile cabin used to carry, store, and transport test equipment and personnel, and to work in conjunction with the system. It includes a control cabin 5-1 and an antenna cabin 5-2. The control cabin 5-1 has a shielding effectiveness of 60dB and is equipped with a power supply system 7, a main control system 8, a video monitoring sensor 6-1, a SUT response monitoring device 4-1, and a field strength measurement device 3-1 for fixing, transporting, and protecting the test equipment, effectively protecting the safety of the test equipment and personnel. The antenna cabin 5-2 is equipped with a near-field focusing phased array antenna system 1. The antenna cabin 5-2 is a sliding cabin and can be configured as a movable structure, just like the control cabin 5-1. After its rear door is opened, it can slide as a whole to overlap with the control cabin 5-1, exposing the near-field focusing phased array antenna 1-1 for testing.

[0029] The power supply system 7 provides AC power to the electrical equipment, and the core of the main control system 8 is a control computer and test evaluation software, which is used to control all functional components of the system to work together, assist testers in completing automated tests, and evaluate the SUT response.

[0030] The near-field focusing phased array antenna system 1 is mounted on the lifting and rotating mechanism 2. The lifting and rotating mechanism 2 serves as a support and auxiliary mechanism for the near-field focusing phased array antenna system 1, and can be electrically controlled to lift from 0.8m to 3m, rotate in the -90° to 90° azimuth plane, and tilt from -30° to 0°. With the assistance of the lifting and rotating mechanism 2, the near-field focusing phased array antenna 1-1 can achieve azimuth plane beam scanning from -60° to 60° and elevation plane beam scanning from -30° to 30°, and can achieve uniform illumination of a large SUT.

[0031] The method for generating electromagnetic fields in the external radio frequency electromagnetic environment testing system for the aforementioned weapon equipment is as follows:

[0032] Step 1: Set the frequency, field strength, polarization, and modulation;

[0033] Step 2, Irradiation:

[0034] 2.1 Illumination distance: The aperture distance of the near-field focusing phased array antenna 1-1 from the test configuration boundary is 3m;

[0035] 2.2 Selection of Irradiation Position: Select at least the front, back and each side of the SUT within a 360° circle on the horizontal and vertical planes. Adjust the lifting and rotating mechanism 2 and select the irradiation position according to the antenna beam scanning range to ensure that the field strength change is within 3dB. For the SUT response monitoring sensor 4-2, place it on the outside or at the unshielded cable position, so that the near-field focusing phased array antenna 1-1 is aligned with it for direct irradiation, and ensure that the field strength change is within 3dB.

[0036] 2.3 Irradiation: By adjusting the lifting and rotating mechanism 2, the near-field focusing phased array antenna 1-1 can perform beam scanning on a certain side of the SUT; by moving the cabin, different sides of the SUT can be irradiated.

[0037] The provided test equipment fully complies with the test requirements of GJB8848-2016. Specifically, this embodiment is a test system for external radio frequency electromagnetic environment in dual-band S-band (3GHz~3.5GHz) and X-band (8GHz~12GHz), wherein the field strength at a distance of 3m in the S-band is 3700V / m and the field strength at a distance of 3m in the X-band is 2500V / m.

[0038] The present invention provides a test method for the external radio frequency electromagnetic environment of weapon equipment that is compatible with this system. The test conditions meet the requirements of GJB8848-2016. The test method specifically includes the following steps:

[0039] Step 1: Set the frequency, field strength, polarization, and modulation to meet the overall development requirements or contract and test outline.

[0040] Step 2, Irradiation:

[0041] 2.1 Illumination distance: The aperture distance of the near-field focusing phased array antenna 1-1 from the test configuration boundary is 3m;

[0042] 2.2 Selection of Irradiation Position: Select at least the front, back and each side of the SUT within a 360° circle on the horizontal and vertical planes. Adjust the lifting and rotating mechanism 2 and select the irradiation position according to the antenna beam scanning range to ensure that the field strength change is within 3dB. For the SUT response monitoring sensor 4-2, place it on the outside or at the unshielded cable position, so that the near-field focusing phased array antenna 1-1 is aligned with it for direct irradiation, and ensure that the field strength change is within 3dB.

[0043] 2.3 Irradiation: By adjusting the lifting and rotating mechanism 2, the near-field focusing phased array antenna 1-1 can perform beam scanning on a certain side of the SUT; by moving the cabin, different sides of the SUT can be irradiated.

[0044] Duration of stay: Meets the requirements of GJB8848-2016.

[0045] In the above methods:

[0046] a) An electromagnetic field is generated by the near-field focusing phased array antenna 1-1;

[0047] b) The electric field applied by the broadband phased array antenna is measured by field strength measuring device 3-1 and field strength measuring sensor 3-2;

[0048] c) Optical fiber is used to transmit signals between the electric field measurement equipment and the electric field measurement sensor;

[0049] d) The response of the SUT is measured by the SUT response monitoring device 4-1 and the SUT response monitoring sensor 4-2;

[0050] e) To ensure the safety of testing equipment and personnel, the testing personnel and equipment are located in a shielded control cabin during the testing process.

[0051] The specific method for measuring electric field using the above method is as follows:

[0052] a) Apply an electric field to the test field in the absence of a SUT, according to the selected modulation method;

[0053] b) Measure the applied electric field to ensure that the field strength reaches the specified value. If the required field strength is the peak field strength, and the electric field measuring device displays the average value, the average reading can be converted into the peak field strength value according to the modulation method and modulation parameters.

[0054] c) Record the amplitude and phase state of each element of the broadband phased array antenna that generates this field strength;

[0055] d) For larger SUTs, measure the electric field at different points in the space occupied by the SUT within the test field to evaluate the uniformity of the electric field;

[0056] e) During the test, the amplitude and phase values ​​of each element of the phased array antenna are adjusted to the recorded state using the main control computer and test control software. The above process is repeated for each test frequency and polarization mode.

[0057] The experimental steps are as follows:

[0058] a) Determine the electromagnetic environment level to be applied;

[0059] b) Adjust the SUT to the specified state;

[0060] c) Set the output signal frequency to the test specified frequency;

[0061] d) Gradually increase the output power of the broadband phased array antenna to reach the required electromagnetic environment level and monitor the SUT response status;

[0062] e) Record the frequency, polarization mode, and irradiation location of the applied electric field;

[0063] f) Change the test frequency point and repeat the above steps for all frequencies;

[0064] g) Change the irradiation position and polarization mode, and repeat the above steps.

[0065] The present invention will now be described in detail through a specific embodiment:

[0066] A test system for external radio frequency electromagnetic environments in both S-band (3GHz–3.5GHz) and X-band (8GHz–12GHz) frequencies, wherein the field strength at a distance of 3m in the S-band is 3700V / m and at a distance of 3m in the X-band is 2500V / m. The system includes a near-field focusing phased array antenna system 1, a lifting and rotating mechanism 2, a field strength measurement system 3, a SUT response monitoring system 4, a movable platform 5, a video monitoring system 6, a power supply system 7, and a main control system 8.

[0067] The near-field focusing phased array antenna system 1 is used to generate an external radio frequency electromagnetic environment that meets standard requirements, including a near-field focusing phased array antenna 1-1, a power supply component 1-2, and a temperature control component 1-3. The main control system 8 is used to control the coordinated operation of each subsystem and assist test personnel in completing automated tests, including a main control computer, a satellite timing device, a communication network, and test and evaluation software. The mobile platform 3 is a mobile cabin used to carry, store, and transport test equipment and test personnel, and works in conjunction with the system, consisting of a control cabin 5-1 and an antenna cabin 5-2. The control cabin 5-1 is used to fix, transport, and protect test equipment, and has a 60dB shielding effectiveness. The field strength measurement system 3 is used for measuring the test field strength, including a field strength measurement sensor 3-2 and a field strength measurement device 3-1. The SUT response monitoring system 5 is used to monitor the response status of the SUT, including an SUT response monitoring sensor 4-2 and an SUT response monitoring device 4-1. The video surveillance subsystem 6 is used to monitor sensitive devices inside the SUT, assisting testers in accurately determining the sensitive status of these devices. It includes video surveillance sensor 6-1 and video surveillance device 6-2. The power supply subsystem 7 is used to supply power to the entire system, including a distribution box and power distribution unit.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A weapon equipment external radio frequency electromagnetic environment testing system, characterized in that: The system includes a near-field focusing phased array antenna system (1), a lifting and rotating mechanism (2), a field strength measurement system (3), a SUT response monitoring system (4), a mobile platform (5), a video monitoring system (6), a power supply system (7), and a main control system (8); the near-field focusing phased array antenna system (1) includes a near-field focusing phased array antenna (1-1), a power supply component (1-2), and a temperature control component (1-3); the field strength measurement system (3) includes a field strength measurement device (3-1) and a field strength measurement sensor (3-2); the SUT response monitoring system (4) includes a SUT response monitoring device (4-1) and a SUT response monitoring sensor (4-2); the video monitoring system (6) includes a video monitoring sensor (6-1) and a video monitoring device (6-2); the near-field focusing phased array antenna... The system (1) is connected to the power supply system (7), the main control system (8), the video monitoring sensor (6-1), the SUT response monitoring device (4-1), and the field strength measurement device (3-1) respectively. The power supply system (7) and the main control system (8) are connected to the video monitoring sensor (6-1), the SUT response monitoring device (4-1), and the field strength measurement device (3-1) respectively. The mobile platform (5) is a mobile cabin, including a control cabin (5-1) and an antenna cabin (5-2). The control cabin (5-1) has a shielding efficiency of 60dB and is equipped with the power supply system (7), the main control system (8), the video monitoring sensor (6-1), the SUT response monitoring device (4-1), and the field strength measurement device (3-1). The antenna cabin (5-2) is equipped with a near-field focusing phased array antenna system (1). The near-field focusing phased array antenna system (1) is mounted on the lifting and rotating mechanism (2); The method for generating electromagnetic fields based on the aforementioned weapon equipment external radio frequency electromagnetic environment test system includes: Step 1: Set the frequency, field strength, polarization, and modulation; Step 2, Irradiation: 2.1 Illumination distance: The aperture distance of the near-field focusing phased array antenna (1-1) from the test configuration boundary is 3m; 2.2 Selection of Irradiation Position: Select at least the front, back and each side of the SUT within a 360° circle on the horizontal and vertical planes. Adjust the lifting and rotating mechanism (2) and select the irradiation position according to the antenna beam scanning range to ensure that the field strength change is within 3dB. For the SUT response monitoring sensor (4-2) exposed to the outside or the unshielded cable position, select the corresponding irradiation position so that the near-field focusing phased array antenna (1-1) is aligned with it for direct irradiation, and ensure that the field strength change is within 3dB. 2.3 Irradiation: By adjusting the lifting and rotating mechanism (2), the near-field focusing phased array antenna (1-1) can be used to scan a certain side of the SUT; by moving the cabin, different sides of the SUT can be irradiated.

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