Shielding coupling device and method for in-situ test of electronic interference pod

Abstract

The invention discloses a shielding coupling device and method for an electronic interference pod in-situ test, and relates to the technical field of airborne electronic countermeasure equipment testing, the shielding coupling device is a split type shielding coupling device, and a segmented shielding coupling mode is adopted for the frequency band and the installation position of a pod antenna. The device is composed of two high-frequency-band antenna shielding coupling boxes and two low-frequency-band antenna shielding coupling boxes which are respectively used for shielding and coupling front and back high-frequency-band directional antennas of an electronic interference pod and low-frequency-band omnidirectional antennas of the abdomen. According to the shielding coupling device and method for the in-situ test of the electronic interference pod, the shielding coupling box can completely and tightly wrap all transmitting and receiving antennas of the electronic interference pod, isolate external interference electromagnetic signals, reduce leakage of internal electromagnetic signals, reduce the false alarm rate and improve the test precision; in-situ testing can be carried out on the electronic interference pod without constructing a microwave anechoic chamber, so that the testing cost is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of airborne electronic countermeasure equipment testing, and in particular to a shielding coupling device and method for in-situ testing of an electronic jamming pod. Background Art

[0002] Airborne electronic jamming pods are key electronic warfare equipment that integrates electronic reconnaissance and jamming and is mounted on combat aircraft. They are used to intercept and sort enemy communications and radar signals, and guide transmitters to jam, providing electronic warfare support for flight formations. At present, the maintenance and support of pods mainly rely on infield detection equipment to perform static performance and functional tests on extensions and functional modules. There is a lack of in-situ testing methods for system-level performance indicators that are closely related to combat effectiveness, such as data loading, signal sorting and identification, and interference radiation power, and it is impossible to fully and objectively reflect the tactical performance that the pod should have in a real environment. Therefore, it is necessary to conduct in-situ testing of the pod. Since the electromagnetic environment of the airport is relatively complex, especially the electromagnetic signals generated by navigation stations, mobile phone base stations, etc. are all within the working frequency band of the pod. If it is tested directly in an open environment, it is very easy to cause false alarms in the pod and damage to the transmitter and operators caused by high-power transmission signals. In order to ensure the accuracy of the test results and the feasibility of the test process, it is necessary to isolate the pod from the external electromagnetic environment through electromagnetic shielding. At present, pod equipment research and development units generally carry out pod whole machine characteristic tests in a microwave darkroom. This method is relatively simple to operate. The disadvantage is that it has high requirements on the site of the pod position and needs to build a microwave darkroom, which has high construction costs. Summary of the invention

[0003] The present invention provides a shielding coupling device and method for in-situ testing of an electronic jamming pod to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A shielded coupling device and method for in-situ testing of an electronic jamming pod. The shielded coupling device is a split shielded coupling device. According to the frequency band and installation position of the pod antenna, a segmented shielded coupling method is adopted. The device is composed of two high-frequency antenna shielded coupling boxes and two low-frequency antenna shielded coupling boxes, which are respectively used for shielding and coupling the front and rear high-frequency directional antennas of the electronic jamming pod and the low-frequency omnidirectional antenna on the abdomen.

[0006] Preferably, the high-frequency antenna shielding coupling box is composed of an electromagnetic shielding shell, an absorbing module, a test antenna and a signal switching module, a waveguide ventilation window and an exhaust fan and a scissor-type lifting mechanism;

[0007] The electromagnetic shielding shell is installed on the scissor lift mechanism;

[0008] The wave absorbing module is installed on the inner surface of the electromagnetic shielding shell;

[0009] The test antenna is installed inside the electromagnetic shielding shell and connected to the signal transfer module;

[0010] The waveguide ventilation window and the exhaust fan are installed at the openings on the upper and lower surfaces of the electromagnetic shielding shell.

[0011] Preferably, the electromagnetic shielding shell is a fully enclosed hexahedral metal shell, which is installed on the scissor-type lifting mechanism. The shell is made of stainless steel plate and the outer surface is sprayed with plastic for rust prevention. The inner surface is the installation surface of the absorbing material. The electromagnetic shielding shell can be divided into a high-frequency band shielding shell and a low-frequency band shielding shell. Due to different test parts, their structures are different. A circular hatch is opened on one side of the high-frequency band shielding shell to dock with the front / rear end of the pod for high-frequency testing. The shell of the low-frequency shielding device is composed of independent left and right parts, and the hatch is a pod belly antenna cover imitating structure. After closing the left and right with universal wheels, the pod belly is clamped for low-frequency testing. The opening area of ​​the shielding shell is covered with shielding cloth to ensure the shielding effectiveness after docking.

[0012] Preferably, the hatch of the electromagnetic shielding shell is a contoured structure of a nacelle antenna cover.

[0013] Preferably, the absorbing module is installed on the inner surface of the electromagnetic shielding shell, and its material is divided into high-frequency absorbing material and low-frequency absorbing material according to working characteristics; the high-frequency absorbing material adopts polyurethane pyramid absorbing material, and the low-frequency absorbing material adopts ferrite tile absorbing material.

[0014] Preferably, the test antenna is installed inside the electromagnetic shielding shell, and is divided into a high-frequency antenna and a low-frequency antenna, and each frequency band has a receiving antenna and a transmitting antenna; the high-frequency antenna adopts a logarithmic periodic antenna, the operating frequency band is: 8-18GHz, and the length is: 110mm; standing wave ratio: ≤2, 3dB beam width: ≤60°, gain: ≥6dB; the low-frequency antenna adopts a spiral antenna, the operating frequency band is: 70-500MHz, the overall dimensions are: diameter 38mm, length 400mm, standing wave ratio: ≤2, gain: -3-3dB, and vertical polarization is adopted.

[0015] Preferably, the main function of the signal switching module is to switch various signal cables that need to pass through the darkroom, and the converter uses a shielded converter; the interface cover material is a nickel-plated steel component, the cover and the frame are sealed with a copper mesh lining and then fixed with bolts, the RF interface is an N-type connector, and the interface and channel hole are equipped with a shielding cover.

[0016] Preferably, the scissor-type lifting mechanism is a metal bracket structure to cooperate with the pod tooling for easy docking; the bottom of the scissor-type lifting mechanism is equipped with universal wheels to adjust the position and transport the shielding device.

[0017] A shielded coupling method for in-situ testing of an electronic jamming pod is realized based on a shielded coupling device for in-situ testing of an electronic jamming pod. The shielded coupling device can realize in-situ testing of a certain type of electronic jamming pod. The shielded coupling device adopts a segmented shielded coupling method according to the frequency band and installation position of the pod antenna, and uses two high-frequency antenna shielded coupling boxes to respectively cover the front and rear high-frequency directional antennas of the electronic jamming pod, and uses two low-frequency antenna shielded coupling boxes to cover the low-frequency omnidirectional antenna on the belly of the electronic jamming pod. The antenna shielded coupling box shields and absorbs all receiving and transmitting antennas (a variety of antenna combinations within the frequency range of 0.07GHz to 18GHz) of the airborne electronic jamming pod, and transmits and receives signals with the pod antenna through a built-in test antenna, which is equivalent to constructing a small microwave darkroom within the operating frequency range of the pod, and can carry out testing work in two states of pod reception and radiation under the conditions of shielded reception and radiation absorption space, so as to realize in-situ testing of a certain type of airborne electronic jamming pod.

[0018] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art:

[0019] 1. The present invention provides a shielded coupling device and method for in-situ testing of an electronic jamming pod. The shielded coupling box can completely and tightly cover all the transceiver antennas of the electronic jamming pod, isolate external interference electromagnetic signals, reduce the leakage of internal electromagnetic signals, reduce the false alarm rate, and improve the test accuracy.

[0020] 2. The present invention provides a shielded coupling device and method for in-situ testing of an electronic jamming pod, which can perform in-situ testing of the electronic jamming pod without building a microwave darkroom, greatly reducing the testing cost.

[0021] 3. The present invention provides a shielded coupling device and method for in-situ testing of an electronic jamming pod. The electronic jamming pod is tested in-situ by antenna shielding coupling, and the real functions and performance technical indicators of the pod can be detected, thus avoiding the problem of inaccurate and incomplete testing of the extension unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a flow chart of the in-situ test of the electronic jamming pod of the present invention;

[0023] Figure 2 It is a composition diagram of the shielding coupling device of the present invention;

[0024] Figure 3 This is a structural diagram of the high-frequency antenna shielding coupling box of the present invention;

[0025] Figure 4 This is a structural diagram of a half low-frequency band antenna shielding coupling box of the present invention;

[0026] Figure 5 This is a structural diagram of an assembly of a low-frequency antenna shielding coupling box of the present invention;

[0027] Figure 6 This is a diagram showing the internal structure of the high-frequency antenna shielding coupling box of the present invention;

[0028] Figure 7 The wave absorbing module of the present invention;

[0029] Figure 8 It is a schematic diagram of the in-situ test connection of the present invention.

[0030] In the figure: 1. Electromagnetic shielding shell; 2. Wave absorbing module; 3. Test antenna and signal adapter module; 4. Waveguide ventilation window and exhaust fan; 5. Scissor-type lifting mechanism. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0032] like Figure 1-Figure 8 As shown, a shielded coupling device and method for in-situ testing of an electronic jamming pod are provided. The shielded coupling device is a split shielded coupling device. According to the frequency band and installation position of the pod antenna, a segmented shielded coupling method is adopted. The device is composed of two high-frequency antenna shielded coupling boxes and two low-frequency antenna shielded coupling boxes, which are respectively used for shielding and coupling the front and rear high-frequency directional antennas of the electronic jamming pod and the low-frequency omnidirectional antenna on the abdomen.

[0033] A split shielded test cabin is used, and antenna shielding couplers are installed for antennas at different positions in the pod. As a split shielded coupling device, it is relatively small in size and low in cost, and can meet the in-situ testing needs of the pod.

[0034] The high-frequency band antenna shielding coupling box is composed of an electromagnetic shielding shell 1, an absorbing module 2, a test antenna and a signal switching module 3, a waveguide ventilation window and an exhaust fan 4, and a scissor-type lifting mechanism 5;

[0035] The electromagnetic shielding shell 1 is installed on the scissor lift mechanism 5;

[0036] The wave absorbing module 2 is installed on the inner surface of the electromagnetic shielding shell 1;

[0037] The test antenna is installed inside the electromagnetic shielding housing 1 and is connected to the signal switching module;

[0038] The waveguide ventilation window and the exhaust fan 4 are installed at the openings on the upper and lower surfaces of the electromagnetic shielding shell 1 .

[0039] The electromagnetic shielding shell 1 is a fully enclosed hexahedral metal shell, which is installed on the scissor-type lifting mechanism 5. The shell is made of stainless steel plate and the outer surface is sprayed with plastic for rust prevention. The inner surface is the installation surface of the absorbing material. The electromagnetic shielding shell 1 can be divided into a high-frequency band shielding shell and a low-frequency band shielding shell. Due to different test parts, their structures are different. A circular hatch is opened on one side of the high-frequency band shielding shell to connect with the front / rear end of the pod for high-frequency testing. The low-frequency shielding device shell is composed of independent left and right parts, and the hatch is a profiling structure of the pod belly antenna cover. After closing the left and right sides through the universal wheels, the pod belly is clamped for low-frequency testing. The opening area of ​​the shielding shell is covered with shielding cloth to ensure the shielding effectiveness after docking.

[0040] The hatch of the electromagnetic shielding shell 1 is a contoured structure of the nacelle radome.

[0041] The absorbing module 2 is installed on the inner surface of the electromagnetic shielding shell 1. According to the working characteristics, its material is divided into high-frequency absorbing material and low-frequency absorbing material; the high-frequency absorbing material adopts polyurethane pyramid absorbing material, and the low-frequency absorbing material adopts ferrite tile absorbing material.

[0042] The test antenna is installed inside the electromagnetic shielding shell 1, which is divided into a high-frequency antenna and a low-frequency antenna. Each frequency band has a receiving antenna and a transmitting antenna; the high-frequency antenna adopts a logarithmic periodic antenna, the working frequency band is: 8-18GHz, the length is: 110mm; the standing wave ratio: ≤2, the 3dB beam width: ≤60°, the gain: ≥6dB; the low-frequency antenna adopts a spiral antenna, the working frequency band is: 70-500MHz, the overall dimensions are: diameter 38mm, length 400mm, standing wave ratio: ≤2, gain: -3-3dB, and vertical polarization is adopted.

[0043] The main function of the signal switching module is to switch various signal cables that need to pass through the darkroom. The converter uses a shielded converter. The interface cover material is a nickel-plated steel component. The cover and the frame are sealed with a copper mesh lining and then fixed with bolts. The RF interface is an N-type connector, and the interface and channel hole are equipped with a shielded cover.

[0044] The scissor-type lifting mechanism 5 is a metal bracket structure to cooperate with the pod tooling for easy docking; the bottom of the scissor-type lifting mechanism 5 is equipped with universal wheels to adjust the position and transport the shielding device.

[0045] A shielded coupling method for in-situ testing of an electronic jamming pod is realized based on a shielded coupling device for in-situ testing of an electronic jamming pod. The shielded coupling device can realize in-situ testing of a certain type of electronic jamming pod. The shielded coupling device adopts a segmented shielded coupling method according to the frequency band and installation position of the pod antenna, and uses two high-frequency antenna shielded coupling boxes to respectively cover the front and rear high-frequency directional antennas of the electronic jamming pod, and uses two low-frequency antenna shielded coupling boxes to cover the low-frequency omnidirectional antenna on the belly of the electronic jamming pod. The antenna shielded coupling box shields and absorbs all receiving and transmitting antennas (a variety of antenna combinations within the frequency range of 0.07GHz to 18GHz) of the airborne electronic jamming pod, and transmits and receives signals with the pod antenna through a built-in test antenna, which is equivalent to constructing a small microwave darkroom within the operating frequency range of the pod, and can carry out testing work in two states of pod reception and radiation under the conditions of shielded reception and radiation absorption space, so as to realize in-situ testing of a certain type of airborne electronic jamming pod.

[0046] The working principles of the present invention are as follows: First, a shielded coupling device is used to shield and absorb waves from all receiving and transmitting antennas of an airborne electronic jamming pod, which is equivalent to constructing a small microwave darkroom within the operating frequency range of the pod. Second, the test is carried out under the control of an automatic test system, and the pod is connected to the automatic test system to control and power the pod status. Signals are received and sent between the built-in test antenna of the shielded coupling device and the pod antenna, and the corresponding test antenna RF port is connected to the signal source and spectrum analyzer in the automatic test system, which are used to synthesize the signals required for the test under the control of the automatic test system and to analyze the pod radiation signals. The pod reception and radiation state tests can be carried out under the conditions of shielded reception and radiation absorption space. The test process is as follows: Figure 1 As shown, the specific steps are as follows:

[0047] (1) Due to the position of the pod storage vehicle, the low-frequency band shielding device cannot be directly installed on the belly of the pod. Therefore, when actually carrying out docking and debugging, a gantry crane is used to lift the pod (without using a storage vehicle for support), and then the shielding device is placed on the belly of the pod for installation. Two low-frequency band antenna shielding coupling boxes are installed on the belly of a certain type of electronic jammer pod, and the antennas are covered from under the pod. When docking with the pod for testing, first align and bring the two low-frequency band boxes close together so that the conductive foam between the boxes is in full contact; then adjust the lifting vehicle so that the belly of the pod is in full contact with the conductive foam; tighten the lock between the two boxes to keep the contact part between the pod and the box fully fitted and under a certain pressure.

[0048] (2) The height of the two high-frequency antenna shielding coupling boxes is adjusted through the scissor-type lifting mechanism, and they are respectively placed on the front and rear ends of the electronic jamming pod to shield and absorb the forward and rear antennas of the pod.

[0049] (3) After the shielded coupling device is connected to the pod, the plug on the top of the pod is connected to the automatic test system through a cable. The connection diagram is shown in the figure. Figure 8 shown.

[0050] (4) Connect the signal source and spectrum analyzer in the automatic test system to the corresponding interfaces of the antenna shield coupling device through RF cables. The connection diagram is shown in the figure. Figure 8 shown.

[0051] (5) According to the test plan, the test is completed using the automatic test system to program the electronic jamming pod, signal source and spectrum analyzer. First, the pod is controlled to be in a specific state, and then the signal source is controlled to synthesize the signal required for the test and couple it to the pod's receiving antenna through the built-in transmitting antenna to read the pod's sorting and identification status; or the jamming emission signal radiated by the pod is received through the built-in receiving antenna and sent to the spectrum analyzer for testing. Finally, the test results are obtained through analysis.

[0052] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A shielded coupling device for in-situ testing of an electronic jamming pod, characterized in that: The shielded coupling device is a split shielded coupling device. According to the frequency band and installation position of the pod antenna, a segmented shielded coupling method is adopted. It consists of two high-frequency antenna shielded coupling boxes and two low-frequency antenna shielded coupling boxes, which are used for shielding coupling of the front and rear high-frequency directional antennas of the electronic jamming pod and the low-frequency omnidirectional antenna on the abdomen.

2. A shielded coupling device for in-situ testing of an electronic jamming pod according to claim 1, characterized in that: The high-frequency band antenna shielding coupling box is composed of an electromagnetic shielding shell (1), an absorbing module (2), a test antenna and a signal switching module (3), a waveguide ventilation window and an exhaust fan (4), and a scissor-type lifting mechanism (5); The electromagnetic shielding shell (1) is installed on a scissor-type lifting mechanism (5); The wave absorbing module (2) is installed on the inner surface of the electromagnetic shielding shell (1); The test antenna is installed inside the electromagnetic shielding housing (1) and is connected to the signal switching module; The waveguide ventilation window and the exhaust fan (4) are installed at the openings on the upper and lower surfaces of the electromagnetic shielding shell (1).

3. A shielded coupling device for in-situ testing of an electronic jamming pod according to claim 2, characterized in that: The electromagnetic shielding shell (1) is a fully enclosed hexahedral metal shell, which is installed on the scissor-type lifting mechanism (5). The shell is made of a stainless steel plate, and the outer surface is sprayed with plastic to prevent rust. The inner surface is the mounting surface of the absorbing material; The electromagnetic shielding shell (1) can be divided into a high-frequency shielding shell and a low-frequency shielding shell. Due to different test locations, their structures are different. A circular hatch is opened on one side of the high-frequency shielding shell to dock with the front end / rear end of the pod for high-frequency testing. The shell of the low-frequency shielding device is composed of independent left and right parts. The hatch is a pod belly antenna cover-shaped structure. After closing the left and right parts through universal wheels, the pod belly is clamped for low-frequency testing. The opening area of ​​the shielding shell is covered with shielding cloth to ensure the shielding effectiveness after docking.

4. A shielded coupling device for in-situ testing of an electronic jamming pod according to claim 2, characterized in that: The hatch of the electromagnetic shielding shell (1) is a contoured structure of a nacelle radome.

5. The shielded coupling device for in-situ testing of an electronic jamming pod according to claim 2, characterized in that: The absorbing module (2) is installed on the inner surface of the electromagnetic shielding shell (1), and its material is divided into high-frequency absorbing material and low-frequency absorbing material according to working characteristics; the high-frequency absorbing material adopts polyurethane pyramid absorbing material, and the low-frequency absorbing material adopts ferrite tile absorbing material.

6. A shielded coupling device for in-situ testing of an electronic jamming pod according to claim 2, characterized in that: The test antenna is installed inside the electromagnetic shielding shell (1), and is divided into a high-frequency antenna and a low-frequency antenna. Each frequency band has a receiving antenna and a transmitting antenna. The high-frequency antenna adopts a logarithmic periodic antenna, with an operating frequency band of 8 to 18 GHz and a length of 110 mm. Standing wave ratio: ≤2, 3dB beam width: ≤60°, gain: ≥6dB; the low-frequency antenna adopts a spiral antenna, the working frequency band: 70~500MHz, the overall dimensions: diameter 38mm, length 400mm, standing wave ratio: ≤2, gain: -3~3dB, and vertical polarization.

7. A shielded coupling device for in-situ testing of an electronic jamming pod according to claim 2, characterized in that: The main function of the signal transfer module is to transfer various signal cables that need to pass through the darkroom. The converter uses a shielded converter; The interface cover is made of nickel-plated steel. The cover and the frame are sealed with a copper mesh lining and fixed with bolts. The RF interface is an N-type connector, and the interface and channel holes are equipped with shielding covers.

8. The shielded coupling device for in-situ testing of an electronic jamming pod according to claim 2, characterized in that: The scissor-type lifting mechanism (5) is a metal bracket structure to match the pod tooling for easy docking; the bottom of the scissor-type lifting mechanism (5) is equipped with universal wheels to adjust the position and transport the shielding device.

9. A shielded coupling method for in-situ testing of an electronic jamming pod, based on any one of claims 1 to 8, wherein the shielded coupling device for in-situ testing of an electronic jamming pod is implemented, characterized in that: The shielded coupling device can realize in-situ testing of a certain type of electronic jamming pod; the shielded coupling device adopts a segmented shielded coupling method according to the frequency band and installation position of the pod antenna, and uses two high-frequency antenna shielded coupling boxes to cover the front and rear high-frequency directional antennas of the electronic jamming pod respectively, and uses two low-frequency antenna shielded coupling boxes to cover the low-frequency omnidirectional antenna on the belly of the electronic jamming pod; the antenna shielded coupling box shields and absorbs all receiving and transmitting antennas of the airborne electronic jamming pod, and sends and receives signals with the pod antenna through the built-in test antenna, which is equivalent to building a small microwave darkroom within the operating frequency range of the pod. It can carry out testing of the pod reception and radiation states under the conditions of shielded reception and radiation absorption space, thereby realizing in-situ testing of a certain type of airborne electronic jamming pod.

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