Microwave darkroom and aircraft navigation communication terminal anti-interference test system

Abstract

The invention relates to a microwave anechoic chamber and an aircraft navigation communication terminal anti-interference test system. A cylindrical bottom with the same diameter is arranged at the bottom of a hemispherical top of the microwave anechoic chamber; a discrete satellite signal simulation transmitting antenna is arranged at the center of the inner top wall of the hemispherical top; the transmitting ends of the plurality of interference signal transmitting antennas all point to the sphere center of the hemispherical top; the multiple sliding rails are distributed in a circular array mode with the center axis of the cylindrical bottom as the circle center. Each sliding rail comprises a vertical part, and the top of each vertical part is connected with a semicircular part making contact with the inner wall of the corresponding hemispherical top. The circle center of the semicircular part is concentric with the sphere center of the hemispherical top; the interference signal transmitting antenna moves on the sliding rail through the moving assembly to change the pitch angle, so that interference parameters such as the interference direction, the number and the motion trail can be controlled, the incoming direction of interference in the whole airspace can be covered, the condition of continuous motion of a target receiver relative to the incoming direction of interference can be accurately simulated, and the accuracy of interference is improved. And the anti-interference test requirement of a high-dynamic Beidou navigation communication terminal product can be met.

Description

Technical Field

[0001] This application relates to the field of communication testing technologies, and particularly to a microwave anechoic chamber and an anti-interference test system for an aircraft navigation communication terminal. Background Art

[0002] Currently, the anti-interference test system for the Beidou navigation communication terminal of an aircraft is constructed based on Beidou-1 and Beidou-2 navigation satellites. The test methods mainly include indoor conductive (wired injection) and indoor wireless radiation.

[0003] Indoor conductive testing cannot perform airspace anti-interference performance testing, which has certain limitations for testing the multi-antenna Beidou-3 navigation communication equipment of an aircraft.

[0004] In traditional indoor radiation testing, the satellite simulation signal is incident from the same direction, and the direction of the interference signal is fixed, making it impossible to evaluate the performance of airspace anti-interference navigation communication equipment.

[0005] Therefore, there is an urgent need to design a new test system to make up for the limitations of airspace anti-interference performance testing and solve the problem that the satellite simulation signal and the interference signal can only be incident from a single direction in traditional indoor radiation testing. Summary of the Invention

[0006] Embodiments of this application provide a microwave anechoic chamber and an anti-interference test system for an aircraft navigation communication terminal to solve the problem that the satellite simulation signal and the interference signal can only be incident from a single direction in traditional indoor radiation testing in related technologies.

[0007] In a first aspect, a microwave anechoic chamber is provided, which includes:

[0008] A sealing structure, which includes a hemispherical top, and a cylindrical bottom with the same diameter is provided at the bottom of the hemispherical top; a discrete satellite signal simulation transmitting antenna is provided at the center of the inner top wall of the hemispherical top;

[0009] A plurality of interference signal transmitting antennas, which are located in the internal space of the sealing structure, and their transmitting ends all point to the center of the hemispherical top; the center of the sphere is located on the central axis of the cylindrical bottom;

[0010] A plurality of sliding rails are distributed in a circular array with the central axis of the cylindrical bottom as the center of the circle; each sliding rail includes a vertical portion, and the top of the vertical portion is connected with a semi-circular portion that contacts the inner wall of the hemispherical top; the center of the semi-circular portion is concentric with the center of the sphere of the hemispherical top; at least two of the interference signal transmitting antennas are provided on each sliding rail, and each interference signal transmitting antenna is connected to the sliding rail through a moving component. With the above settings, the interference signal transmitting antenna can move on the sliding rail through the moving component to change the pitch angle. In addition, different numbers of interference signal transmitting antennas and sliding rails can be set as needed, so that the interference parameters such as the interference direction, number, and movement trajectory can be controlled. The movement trajectory of the interference signal transmitting antenna can be continuously simulated on the spherical surface, making the signal calibration and simulation control more accurate and easier to achieve, and the incoming directions of interference in the entire airspace can be covered, accurately simulating the situation when the target receiver moves continuously relative to the incoming direction of interference, which can meet the anti-interference test requirements of high-dynamic Beidou navigation communication terminal products.

[0011] In addition, since electromagnetic waves are omnidirectionally emitted in the darkroom, the normal directions of the satellite signal and the interference signal both point to the center of the hemisphere, simulating the outdoor real constellation distribution and signal radiation characteristics. The spherical space also reduces the signal calibration difficulty and has good quiet zone characteristics.

[0012] In some embodiments, the number of the sliding rails is six, and the central angle corresponding to adjacent two sliding rails is 60°.

[0013] In some embodiments, a rack is provided on the sliding rail along its trajectory direction;

[0014] The moving component includes a moving slider slid on the sliding rail; a gear meshing with the rack is provided in the moving slider; the gear is drivingly connected with a stepping motor;

[0015] The interference signal transmitting antenna is fixedly connected with the moving slider.

[0016] In some embodiments, a guiding groove is provided on the sliding rail along its trajectory direction;

[0017] The moving component includes a moving slider slid on the sliding rail; a telescopic member is provided therein, and a friction block located in the guiding groove is provided at the telescopic end of the telescopic member;

[0018] The interference signal transmitting antenna is fixedly connected with the moving slider.

[0019] In some embodiments, a plurality of interference signal transmitting antennas are provided on each sliding rail.

[0020] In some embodiments, the included angle formed between the top limit position and the bottom limit position where the interference signal transmitting antenna moves on the sliding rail is 115°.

[0021] In a second aspect, a anti-jamming test system for an aircraft navigation and communication terminal is provided, which includes:

[0022] A microwave anechoic chamber;

[0023] A three-dimensional test turntable, which is arranged at the center of the bottom of the cylindrical bottom and is used to adjust the attitude of the satellite navigation receiver under test to simulate the trajectory attitude of the aircraft;

[0024] A plurality of interference simulators, which are connected to the interference signal transmitting antennas in one-to-one correspondence;

[0025] A test control device, which is connected to the discrete satellite signal simulation transmitting antenna through a radio frequency switching network, and is also connected to the interference simulator, the moving component and the three-dimensional test turntable.

[0026] In some embodiments, the height of the top of the three-dimensional test turntable coincides with the height of the center of the spherical top of the hemispherical shape;

[0027] The center of the discrete satellite signal simulation transmitting antenna, the center of the spherical top of the hemispherical shape, and the center of the top of the three-dimensional test turntable are located on the central axis of the cylindrical bottom.

[0028] In some embodiments, the test control device includes a flight trajectory simulation module, a test control and evaluation module, and a management control module;

[0029] The management control module is used to control the opening and closing of the corresponding interference simulation source according to the requirements of the interference test scenario, so that the interference signal transmitting antenna emits target parameters; control the movement of the interference signal transmitting antenna to adjust the direction of the interference source;

[0030] The management control module is used to control the three-dimensional test turntable to adjust the attitude and rotation mode of the satellite navigation receiver under test according to the flight trajectory simulation module, and receive the positioning information of the satellite navigation receiver under test through the radio frequency switching network;

[0031] The management control module is used to determine the positioning performance of the satellite navigation receiver under test during the rotation process in different attitudes according to the positioning information.

[0032] In some embodiments, the radio frequency switching network uses a radio frequency switching matrix. The discrete satellite signal simulation transmitting antenna in the microwave anechoic chamber is connected to the radio frequency switching matrix, and the radio frequency signal is configured and the switching switch is controlled through the network to connect the test control device and the discrete satellite signal simulation transmitting antenna.

[0033] The beneficial effects brought by the technical solution provided by this application include:

[0034] The embodiment of the present application provides a microwave anechoic chamber and an anti-interference test system for an aircraft navigation communication terminal. Since the hemispherical top is provided with a cylindrical bottom having the same diameter as the hemispherical top; a discrete satellite signal simulation transmitting antenna is provided at the center of the inner top wall of the hemispherical top; the transmitting ends of multiple interference signal transmitting antennas all point to the center of the hemispherical top; multiple slide rails are distributed in a circular array with the central axis of the cylindrical bottom as the center of the circle; each slide rail includes a vertical part, and the top of the vertical part is connected with a semi-circular part in contact with the inner wall of the hemispherical top; the center of the semi-circular part is concentric with the center of the hemispherical top; the interference signal transmitting antenna moves on the slide rail through a moving component to change the pitch angle, so that the interference parameters such as the interference direction, number, and movement trajectory can be controlled, the incoming directions of interference within the entire airspace can be covered, and the situation when the target receiver moves continuously relative to the incoming direction of interference can be accurately simulated, which can meet the anti-interference test requirements of high-dynamic Beidou navigation communication terminal products. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 FIG. is a schematic diagram of the system composition of the anti-interference test system for an aircraft navigation communication terminal provided by the embodiment of the present application;

[0037] Figure 2 FIG. is a schematic diagram of the distribution of the interference signal transmitting antennas in the microwave anechoic chamber provided by the embodiment of the present application;

[0038] Figure 3 FIG. is a top view of the distribution of multiple slide rails provided by the embodiment of the present application;

[0039] Figure 4 FIG. is a schematic diagram of the structure of the interference signal transmitting antenna and the moving component on the slide rail provided by the embodiment of the present application;

[0040] Figure 5 FIG. is a simulation effect diagram of the motion trajectory of the simulated Beidou-3 satellite provided by the embodiment of the present application.

[0041] In the figure: 1. Hemispherical top; 2. Cylindrical bottom; 3. Slide rail; 4. Interference signal transmitting antenna; 5. Moving component; 6. Discrete satellite signal simulation transmitting antenna; 7. Three-dimensional test turntable. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0043] It should be understood for this application that:

[0044] The environmental part of the microwave anechoic chamber includes the main body environments such as chamber shielding, wave absorption, communication, and lighting.

[0045] The interference simulator is mainly used for suppressing the simulation and broadcasting of interference signals, and at the same time supports the output of generated deceptive interference signals through software configuration.

[0046] The embodiments of this application provide a microwave anechoic chamber and an anti-interference test system for an aircraft navigation communication terminal to solve the problem in the related art that in traditional indoor radiation tests, satellite simulation signals and interference signals can only enter from a single direction.

[0047] Please refer to Figures 2 - 4 , which provides a microwave anechoic chamber, including:

[0048] A sealing structure, which includes a hemispherical top 1, and a cylindrical bottom 2 with the same diameter is provided at the bottom of the hemispherical top 1; a discrete satellite signal simulation transmitting antenna 6 is provided at the center of the inner top wall of the hemispherical top 1;

[0049] A plurality of interference signal transmitting antennas 4, which are located in the internal space of the sealing structure, and their transmitting ends all point to the center of the hemispherical top 1; the center of the sphere is located on the central axis of the cylindrical bottom 2;

[0050] A plurality of slide rails 3, which are distributed in a circular array with the central axis of the cylindrical bottom 2 as the center of the circle; each slide rail 3 includes a vertical part, and the top of the vertical part is connected with a semi-circular part in contact with the inner wall of the hemispherical top 1; the center of the semi-circular part is concentric with the center of the sphere of the hemispherical top 1; at least two interference signal transmitting antennas 4 are provided on each slide rail 3, and each interference signal transmitting antenna 4 is connected to the slide rail 3 through a moving component 5.

[0051] Through the above settings, the interference signal transmitting antenna 4 can move on the slide rail 3 through the moving component 5 to change the pitch angle. Additionally, different numbers of interference signal transmitting antennas 4 and slide rails 3 can be set as needed, so that the interference parameters such as the interference direction, number, and movement trajectory can be controlled. The movement trajectory of the interference signal transmitting antenna 4 can be continuously simulated on the spherical surface, making signal calibration and simulation control more accurate and easier to implement, and can cover the directions of interference in the entire airspace, accurately simulating the situation when the target receiver moves continuously relative to the interference direction, and can meet the anti-interference test requirements of high-dynamic Beidou navigation communication terminal products.

[0052] In addition, since electromagnetic waves are omnidirectionally emitted in the anechoic chamber, the normal directions of the satellite signal and the interference signal both point to the center of the hemispherical sphere, simulating the true constellation distribution and signal radiation characteristics outdoors. The spherical space also reduces the signal calibration difficulty and has good quiet zone characteristics.

[0053] In some preferred embodiments, four interference signal transmitting antennas 4 are provided on each slide rail 3; this can better meet the comprehensive coverage of test requirements. Refer to Figure 2 as shown.

[0054] In some preferred embodiments, the number of slide rails 3 is six, and the corresponding central angle between two adjacent slide rails 3 is 60°; refer to the appendix Figure 3 , appendix Figure 3 , where X and Y are geodetic coordinates. Z in the appendix Figure 4 is also a geodetic coordinate.

[0055] The included angle formed between the top limit position and the bottom limit position of the interference signal transmitting antenna 4 moving on the slide rail 3 is 115°, which can provide a pitch angle α in the range of -15° to 90°, and always keep the beam pointing to the center of the sphere. Refer to the appendix Figure 4 . This embodiment is just an optimal solution, but other solutions are not excluded. In this solution, the test requirements can be met with the minimum number of slide rails 3 and interference signal transmitting antennas 4.

[0056] In some preferred embodiments, the structure of the moving component 5 can have the following two forms:

[0057] First, a rack is provided on the slide rail 3 along its trajectory direction;

[0058] The moving component 5 includes a moving slider slid on the slide rail 3; a gear meshing with the rack is provided inside the moving slider; the gear is drivingly connected to a stepping motor.

[0059] The interference signal transmitting antenna 4 is fixedly connected to the moving slider.

[0060] Second, a guide groove is provided on the slide rail 3 along its trajectory direction;

[0061] The moving component 5 includes a moving slider slidably disposed on the slide rail 3; a telescopic member is provided therein, and a friction block located in the guiding groove is provided at the telescopic end of the telescopic member;

[0062] The interference signal transmitting antenna 4 is fixedly connected to the moving slider.

[0063] In this application, other structures that can adjust and lock the interference signal transmitting antenna 4 are not excluded, as long as the functions can be achieved.

[0064] Reference Figure 1 , this application also provides an anti-interference test system for an aircraft navigation communication terminal, which includes:

[0065] A microwave anechoic chamber;

[0066] A three-dimensional test turntable 7, which is disposed at the center of the bottom of the cylindrical bottom 2 and is used to adjust the attitude of the satellite navigation receiver to be tested to simulate the trajectory attitude of the aircraft and realize the interference incoming direction test of the azimuth angle from 0 to 360°;

[0067] A plurality of interference simulators, which are connected to the interference signal transmitting antenna 4 in one-to-one correspondence;

[0068] A test control device, which is connected to the discrete satellite signal simulation transmitting antenna 6 through a radio frequency switching network, and is also connected to the interference simulator, the moving component 5 and the three-dimensional test turntable 7.

[0069] Wherein, the height of the top of the three-dimensional test turntable 7 coincides with the height of the center of the spherical top 1; the center of the discrete satellite signal simulation transmitting antenna 6, the center of the spherical top 1, and the center of the top of the three-dimensional test turntable 7 are located on the central axis of the cylindrical bottom 2. By controlling the azimuth angle of the satellite navigation receiver antenna surface through the three-dimensional test turntable 7 and cooperating with the angle of the pitch direction adjusted by the interference signal transmitting antenna 4 through the moving component 5, the interference incoming directions in the entire airspace can be covered, and the situation when the target receiver moves continuously relative to the interference incoming direction can be accurately simulated.

[0070] The test control device includes a flight trajectory simulation module, a test control and evaluation module, and a management control module; the management control module is used to control the opening and closing of the corresponding interference simulation source according to the requirements of the interference test scenario, so that the interference signal transmitting antenna 4 transmits target parameters; control the movement of the interference signal transmitting antenna 4 to adjust the direction of the interference source application; the management control module is used to control the three-dimensional test turntable 7 to adjust the attitude and rotation mode of the satellite navigation receiver under test according to the flight trajectory simulation module, and receive the positioning information of the satellite navigation receiver under test through the RF switching network; the management control module is used to determine the positioning performance of the satellite navigation receiver under test during the rotation process in different attitudes according to the positioning information. The RF switching network uses an RF switching matrix, and the satellite simulation signal transmitting antenna 6 in the microwave anechoic chamber is connected to the RF switching matrix, and the RF signal is configured and the switching switch is controlled through the network to connect the test control device and the discrete satellite signal simulation transmitting antenna 6.

[0071] The advantages of this system are as follows:

[0072] ① The sliding rail type mobile interference antenna array scheme is adopted, which can cover the interference incoming directions in the whole airspace. By using the movement of the interference antenna on the sliding rail, the scenario when the target receiver moves continuously relative to the interference incoming direction can be accurately simulated.

[0073] ② The configurable three-dimensional test turntable injects the flight vehicle trajectory attitude parameter data through the control computer, controls the three-dimensional rotation direction of the turntable, and realizes the simulation verification of the dynamic interference scenario of the flight vehicle.

[0074] ② The RF switching network, through software and hardware cooperation, divides the interference source RF signal into respective signal branches, and broadcasts them to the interference antenna array correspondingly, and can control the RF signal characteristics of each signal branch in real time, including frequency, interference waveform, signal intensity, etc.

[0075] It should be noted for this application that:

[0076] For the preconditions of satellite navigation terminal performance measurement, it is required to provide plane wave illumination to the device under test, and the distance between the transmitting antenna and the navigation receiver should meet the far-field condition, that is:

[0077]

[0078] Where R is the minimum distance between the transmitting and receiving antennas, λ is the working signal wavelength; D is the size of the quiet zone, and it is required that the size of the device under test is smaller than D.

[0079] This system should be able to support the high-precision performance test of the flight vehicle satellite navigation terminal, and the quiet zone of the device under test is taken to be not less than 1.2m (length) * 1.2m (width) * 1.2m (height). Therefore, the minimum distance between the transmitting and receiving antennas is calculated as shown in the following table for the far-field condition.

[0080]

[0081] Therefore, it is designed that the distance between all transmitting antennas and the receiving antenna of the device under test is greater than 15 meters.

[0082] A specific application case is also given for this system for illustration:

[0083] The discrete layout antenna array is adopted to simulate the satellite constellation scheme to simulate the spatio-temporal characteristics of the signals of the Beidou-3 satellite constellation. The beam width formed by the seven-element array antenna for satellite navigation is simulated and calculated, and its 3dB beam width is 47°. The simulation requirements for the Beidou-3 satellite constellation are as follows: ① The spatial angle between the simulated signals of the satellites in the same elevation orbital plane needs to be less than 47°; ② The elevation angle between the signals of the satellites with the same azimuth angle between each orbit also needs to be less than 47°. This simulation scheme uses 25 antennas, which can ensure that the minimum spatial angle between adjacent antennas is designed within the range of 10° to 46°. Through the simulation calculation results, the 25-element discrete antenna array in the design scheme simulates the actual Beidou satellite trajectory as Figure 5 shown, and it can be concluded that this discrete antenna array can approximately simulate the movement trajectory of real Beidou-3 satellites in space.

[0084] This application uniformly samples the discrete positions in the hemispherical space, installs an interference signal transmitting antenna 4 at each sampling point position, and then selects the interference signal transmitting antenna 4 with the closest relative position to transmit the simulated navigation satellite signal according to the azimuth angle and elevation angle of the navigation satellite relative to the object under test, so as to simulate the navigation satellite signals with different incoming wave directions in the real environment. Specifically, the Fibonacci lattice algorithm is used to realize the uniform distribution of a certain number of antennas on the spherical surface. Specifically, the spherical surface is cut into multiple hexagons with the same area, and a point is taken on the surface at the midpoint of each hexagon to ensure that the spatial angle between adjacent antennas is approximately equal. The digital signal compensation technology is adopted to realize the precise compensation of the time delay of the internal part and the RF link of the simulator device, and to realize the continuity of the pseudorange and carrier phase at the target receiving position; control the movement of the interference antenna to adjust the direction of the interference source; control the three-dimensional test turntable to adjust the attitude and rotation mode of the satellite navigation receiver under test; receive the positioning information sent by the satellite navigation receiver under test, and determine the positioning performance of the satellite navigation receiver under test during the rotation process in different postures according to the positioning information.

[0085] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0086] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0087] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A microwave darkroom, characterized in that: It includes: A sealing structure comprising a hemispherical top (1), wherein a cylindrical bottom (2) having the same diameter as the hemispherical top (1) is disposed at the bottom of the hemispherical top (1); A discrete satellite signal simulation transmitting antenna (6) is provided at the center of the inner top wall of the hemispherical top (1); A plurality of interference signal transmitting antennas (4), which are located in the internal space of the sealed structure, and whose transmitting ends are all directed toward the center of the hemispherical top (1); the center of the sphere is located on the central axis of the cylindrical bottom (2); A plurality of slide rails (3) are arranged in a circular array with the central axis of the cylindrical bottom (2) as the center; each slide rail (3) comprises a vertical portion, the top of which is connected to a semicircular portion in contact with the inner wall of the hemispherical top (1); the center of the semicircular portion is concentric with the center of the hemispherical top (1); each slide rail (3) is provided with at least two interference signal transmitting antennas (4), and each interference signal transmitting antenna (4) is connected to the slide rail (3) via a moving component (5).

2. The microwave darkroom according to claim 1, characterized in that: The number of the slide rails (3) is six, and the corresponding central angle between two adjacent slide rails (3) is 60°.

3. The microwave darkroom according to claim 1, characterized in that: The slide rail (3) is provided with a rack along its track direction; The moving assembly (5) comprises a moving slider slidably mounted on the slide rail (3); a gear meshing with the rack is arranged in the moving slider; and a stepping motor is connected to the gear transmission; The interference signal transmitting antenna (4) is fixedly connected to the movable slider.

4. The microwave darkroom according to claim 1, characterized in that: The slide rail (3) is provided with a guide groove along the direction of its track; The moving assembly (5) comprises a moving slider slidably mounted on the slide rail (3); a telescopic member is arranged inside the moving slider; a friction block located in a guide groove is arranged at the telescopic end of the telescopic member; The interference signal transmitting antenna (4) is fixedly connected to the movable slider.

5. The microwave darkroom according to claim 1, characterized in that: Four interference signal transmitting antennas (4) are arranged on each of the slide rails (3).

6. The microwave darkroom according to claim 1, characterized in that: The angle formed between the top limit position and the bottom limit position of the interference signal transmitting antenna (4) when moving on the slide rail (3) is 115°.

7. An aircraft navigation and communication terminal anti-interference test system, characterized in that: It includes: The microwave darkroom according to any one of claims 1 to 6; A three-dimensional test turntable (7) is arranged at the bottom center of the cylindrical bottom (2) and is used to adjust the attitude of the satellite navigation receiver to be tested to simulate the trajectory attitude of the aircraft; A plurality of interference simulators, which are connected to the interference signal transmitting antennas (4) in a one-to-one correspondence; A test control device is connected to the discrete satellite signal simulation transmitting antenna (6) through a radio frequency switching network, and is also connected to the interference simulator, the mobile component (5) and the three-dimensional test turntable (7).

8. The aircraft navigation and communication terminal anti-interference test system according to claim 7, characterized in that: The height of the top of the three-dimensional test turntable (7) coincides with the height of the center of the hemispherical top (1); The center of the discrete satellite signal simulation transmitting antenna (6), the center of the hemispherical top (1), and the top center of the three-dimensional test turntable (7) are located on the central axis of the cylindrical bottom (2).

9. The aircraft navigation and communication terminal anti-interference test system according to claim 7, characterized in that: The test control device includes a flight trajectory simulation module, a test control and evaluation module, and a management control module; The management control module is used to control the opening and closing of the corresponding interference simulation source according to the requirements of the interference test scenario, so that the interference signal transmitting antenna (4) transmits the target parameter; and controls the movement of the interference signal transmitting antenna (4) to adjust the interference source application direction; The management control module is used to control the three-dimensional test turntable (7) to adjust the attitude and rotation mode of the satellite navigation receiver to be tested according to the flight trajectory simulation module, and receive the positioning information of the satellite navigation receiver to be tested through the radio frequency switching network; The management and control module is used to determine the positioning performance of the satellite navigation receiver to be tested during its rotation under different postures according to the positioning information.

10. The aircraft navigation and communication terminal anti-interference test system according to claim 7, characterized in that: The radio frequency switching network adopts a radio frequency switching matrix, the discrete satellite signal simulation transmitting antenna (6) in the microwave darkroom is connected to the radio frequency switching matrix, and the radio frequency signal and control switching switch are configured through the network to connect the test control device and the discrete satellite signal simulation transmitting antenna (6).

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