An air-fed based T / R module test system and method

Abstract

This invention relates to a T / R module testing system and method based on air-feed, including a shielded dark box assembly and a test cabinet assembly. The shielded dark box assembly includes a transition fixture and a robotic arm. The shielded dark box includes an inner cavity and an outer cavity, with the inner cavity wall lined with absorbing material. The robotic arm body is located in the outer cavity of the shielded dark box, and the robotic arm gripper penetrates the inner cavity wall and extends into the inner cavity. An antenna probe is fixed on the robotic arm gripper. The T / R module under test is electrically connected to the test cabinet assembly via the transition fixture. Multiple antenna elements are arranged on the circuit board of the T / R module under test. The robotic arm drives the antenna probe to move directly above the antenna elements on the T / R module under test and at a preset distance from each antenna element on the T / R module under test. Signal transmission is performed between the antenna probe and the antenna elements on the T / R module under test, so that the test cabinet assembly, the antenna probe, and the T / R module under test form a transmission or reception link, thereby realizing the performance testing of the T / R module.

Description

Technical Field

[0001] This invention relates to the field of active analog phased array T / R component performance testing technology, and in particular to a T / R component testing system and method based on air feed. Background Technology

[0002] With the continuous development of microsystem integration technology, more and more active analog phased arrays integrate antenna array elements and T / R component channels together with printed circuit boards to significantly reduce feed loss, profile height and component costs. At the same time, with the continuous upgrading of active phased array application scenarios, the operating frequency band of T / R components is getting higher and higher, the bandwidth is getting wider and wider, and the spacing of their grating-less scanning channels is getting smaller and smaller. Even multi-band and multi-polarization composite situations have emerged, resulting in more and more antenna ports and smaller and smaller sizes. To ensure the reliability of interconnection, the antenna and T / R components have to be soldered together with smaller insulators or BGA solder balls.

[0003] Traditionally, the interconnection between the antenna and the T / R assembly is achieved through standard connectors such as SMA, SMP, and SSMP. The performance indicators of the T / R assembly are tested in a state where it is separated from the antenna. This method ensures accurate and repeatable testing, and the assembly does not affect the original product status of the T / R assembly and antenna.

[0004] For antennas and T / R components that are integrated with the printed circuit board (PCB) or soldered together, separating and testing them becomes extremely difficult. At best, it affects the matching status between the antenna and T / R component, and the validity of the test results cannot be guaranteed after restoration. At worst, it can damage the effective circuitry of the antenna or T / R component, rendering it unrecoverable. In these situations, without comprehensive testing of T / R components with integrated antennas, it is impossible to accurately assess the operational status of the internal components and the correctness and reliability of the assembly process. Even for complex multi-band, multi-polarization active phased arrays, the correctness of the assembly process cannot be confirmed. This hinders the verification of the production status of T / R components with integrated antennas, easily leading to batch production rework and repairs, and even quality problems.

[0005] Therefore, there is an urgent need for a method to quantitatively test the technical specifications of analog phased array transceiver (T / R) components that cannot be separated from the antenna. Summary of the Invention

[0006] Based on the above analysis, the embodiments of the present invention aim to provide a test system and method for T / R components based on air feed, in order to solve the problem that there is a lack of accurate and complete test systems and methods for quantitative testing of T / R component indicators for non-removable antennas in the prior art.

[0007] On one hand, embodiments of the present invention provide a T / R module testing system based on air-feed. The testing system includes a shielded dark box assembly and a test cabinet assembly. The shielded dark box assembly includes a shielded dark box, a transfer fixture disposed within the shielded dark box, and a robotic arm. The shielded dark box includes an inner cavity and an outer cavity, with the inner cavity wall provided with absorbing material. The robotic arm body is located in the outer cavity of the shielded dark box, and the robotic arm grippers penetrate the inner cavity wall and extend into the inner cavity, with an antenna probe fixed on the robotic arm grippers. The transfer fixture is disposed at the bottom of the inner cavity of the shielded dark box, and a test probe is mounted on the transfer fixture. The T / R module under test is electrically connected to the test cabinet assembly via an adapter fixture. The circuit board of the T / R module under test has multiple antenna elements. The robotic arm moves the antenna probe to directly above the antenna elements on the T / R module under test at a preset distance. Signal transmission is carried out between the antenna probe and the antenna elements on the T / R module under test, so that the test cabinet assembly, the antenna probe and the T / R module under test form a transmission or reception link, thereby realizing the performance test of the T / R module.

[0008] Furthermore, the test cabinet assembly is located below the shielded dark box; the test cabinet assembly includes a switching attenuation component, a switching amplification component, a vector network analyzer, and a control unit housed within the test cabinet; the control unit connects to the vector network analyzer, the robotic arm, the switching amplification component, and the switching attenuation component via an Ethernet interface, and processes the test results; one end of the switching amplification component is connected to an adapter fixture, and the other end is connected to the signal input / output port of the vector network analyzer; the switching amplification component is used to provide gain amplification for the signal output by the T / R component under test or the vector network analyzer during the transmit / receive test according to the programmable commands issued by the control unit; one end of the switching attenuation component is connected to the antenna probe, and the other end is connected to the signal input port of the vector network analyzer; the switching attenuation component is used to attenuate the signal transmitted to the vector network analyzer during the test.

[0009] Furthermore, the switching amplification assembly includes a first single-pole double-throw relay, a first directional amplifier, a second directional amplifier, a second single-pole double-throw relay, a power divider, and multiple single-pole single-throw relays;

[0010] The input terminal of the first directional amplifier is connected to the normally closed contact of the first single-pole double-throw relay, and the output terminal is connected to the normally closed contact of the second single-pole double-throw relay; the input terminal of the second directional amplifier is connected to the normally open contact of the second single-pole double-throw relay, and the output terminal is connected to the normally open contact of the first single-pole double-throw relay; the stationary terminal of the first single-pole double-throw relay serves as the input and output ports of the switching amplifier assembly; the stationary terminal of the second single-pole double-throw relay is connected to one end of the power divider, and multiple ports on the other end of the power divider are respectively connected to the SMA connector of the adapter fixture through a single-pole single-throw relay.

[0011] Furthermore, the switching attenuation component includes a third single-pole double-throw relay, a 20dB coaxial attenuator, and a fourth single-pole double-throw relay; the input terminal of the 20dB coaxial attenuator is connected to the normally open contact of the fourth single-pole double-throw relay, and the output terminal is connected to the normally open contact of the third single-pole double-throw relay; the stationary terminal of the third single-pole double-throw relay serves as the input / output port of the switching attenuation component; the stationary terminal of the fourth single-pole double-throw relay is connected to the antenna probe; and the normally closed contact of the third single-pole double-throw relay is connected to the normally closed contact of the fourth single-pole double-throw relay.

[0012] Furthermore, the adapter includes J30JM, SSMP, and SMA connectors; the J30JM connector is used to connect to the low-frequency interface of the T / R component under test, the SSMP connector is used to connect to the high-frequency interface of the T / R component under test, and the SMA connector is used to connect to the switching amplifier component; the J30JM connector is used to connect to the integrated control unit.

[0013] Furthermore, the shielded dark box assembly also includes a laser sight; the laser sight includes an XOZ-plane laser sight and a YOZ-plane laser sight, which are respectively mounted on two opposite corners of the adapter fixture; both the XOZ-plane and YOZ-plane laser sights include a laser emitter and a laser receiver; the laser beam direction in the XOZ-plane laser sight is perpendicular to the XOZ-plane; the laser beam direction in the YOZ-plane laser sight is perpendicular to the YOZ-plane.

[0014] Furthermore, the calibration block includes an XOZ plane calibration block and a YOZ plane calibration block; the XOZ plane calibration block and the YOZ plane calibration block are two rectangular pieces placed perpendicular to each other; one side of the two rectangular pieces is joined to form an L-shape; the tops of the XOZ plane calibration block and the YOZ plane calibration block are fixed to the robotic arm gripper by a mounting plate; the XOZ plane calibration block is placed parallel to the XOZ plane, and the YOZ plane calibration block is placed parallel to the YOZ plane; wherein, the mounting surface of the adapter tool is taken as the XOY plane, and the adapter... The X-axis is the positive direction from left to right on the tooling mounting surface, and the Y-axis is the positive direction from bottom to top on the adapter tooling mounting surface; the Z-axis is the positive direction perpendicular to the adapter tooling mounting surface; both rectangular plates include two mutually perpendicular slits; the laser beam in the XOZ surface laser sight passes through the slit on the XOZ surface calibration block to achieve zero-position calibration of the robotic arm's XOZ surface, and the laser beam in the YOZ surface laser sight passes through the slit on the YOZ surface calibration block to achieve zero-position calibration of the robotic arm's YOZ surface.

[0015] Furthermore, the shielded dark box assembly also includes a passive antenna fixture; the passive antenna fixture includes the same antenna array as the T / R component under test, as well as the same SMA connector and adapter cable as the adapter fixture; the adapter cable is used to connect the SMA connector to the switching amplifier assembly; the passive antenna fixture is used in the test link to replace the adapter fixture and the T / R component under test to obtain data results on the influence of the antenna array elements on the open feed test.

[0016] On the other hand, embodiments of the present invention provide a testing method based on the aforementioned T / R component testing system, the method comprising:

[0017] Connect the T / R component under test, the adapter fixture, and the test cabinet assembly. The robotic arm moves the antenna probe directly above the first antenna element to test the performance indicators of the first antenna element's transmit and receive links. The robotic arm then moves the antenna probe sequentially above each of the remaining antenna elements to complete the same tests as the first antenna element.

[0018] Remove the T / R component and adapter fixture from the test chamber. Install the passive antenna fixture at the bottom of the shielded dark box and connect it to the test cabinet assembly. Move the robotic arm to move the antenna probe directly above the first antenna element of the passive antenna fixture and test the performance indicators of the transmit and receive links of the first antenna element. Move the robotic arm antenna probe to the top of each of the remaining antenna elements of the passive antenna fixture in sequence to complete the same tests as the first antenna element, and obtain the performance indicators of the transmit and receive links of each antenna element.

[0019] The final test results of the T / R component are obtained based on the performance indicators of the transmit and receive links of each antenna element in the T / R component under test and the performance indicators of the transmit and receive links of the corresponding antenna elements in the passive antenna fixture.

[0020] Furthermore, the final test results of the T / R module are obtained based on the performance indicators of the transmit and receive links of each antenna element of the T / R module under test and the corresponding transmit and receive links of the antenna elements in the passive antenna fixture. This includes: subtracting the corresponding indicators of the transmit links of the antenna elements in the passive antenna fixture from the output power, efficiency, waveform drop and leading and trailing edges of the transmit links of each antenna element of the T / R module under test to obtain the final performance indicators of the corresponding items of the transmit links of the T / R module under test; subtracting the corresponding indicators of the receive links of the antenna elements in the passive antenna fixture from the gain, noise figure and input 1dB power compression point P-1 performance indicators of the receive links of each antenna element of the T / R module under test to obtain the final performance indicators of the corresponding items of the receive links of the T / R module under test; and directly using the phase shift RMS, parasitic amplitude modulation, attenuation RMS and parasitic phase modulation indicators of the transmit links of the T / R module under test as the final performance indicators.

[0021] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0022] 1. This invention discloses a T / R module testing system based on space-fed technology, comprising a transfer fixture and a robotic arm within a shielded dark box. The robotic arm body is located in the outer cavity of the shielded dark box, while the robotic arm grippers are located in the inner cavity, with an antenna probe fixed to the grippers. The transfer fixture is positioned on the lower wall of the inner cavity of the shielded dark box, and the T / R module under test is mounted on it. The T / R module under test is electrically connected to the test cabinet assembly via the transfer fixture. The robotic arm moves the antenna probe to a position directly above the antenna elements on the T / R module under test, maintaining a preset distance between the probe and the antenna elements. Signal transmission occurs between the antenna probe and the antenna elements on the T / R module under test, forming a transmit or receive link between the test cabinet assembly, the antenna probe, and the T / R module under test, thereby enabling T / R module performance testing. This system provides a quantitative test of the technical specifications of analog phased array T / R modules that cannot be separated from the antenna using a space-fed method.

[0023] 2. The present invention provides a T / R component testing system based on air feed, comprising a laser aiming device and a calibration block; the laser aiming device includes an XOZ-plane laser aiming device and a YOZ-plane laser aiming device, which are respectively mounted on two opposite corners of the adapter fixture; both the XOZ-plane and YOZ-plane laser aiming devices include a laser emitter and a laser receiver; the laser beam direction in the XOZ-plane laser aiming device is perpendicular to the XOZ-plane; the laser beam direction in the YOZ-plane laser aiming device is perpendicular to the YOZ-plane. The calibration block includes an XOZ surface calibration block and a YOZ surface calibration block. The top surfaces of both blocks are fixed to the robotic arm gripper via a mounting plate. The XOZ and YOZ surface calibration blocks are placed parallel to the XOZ surface, and the YOZ surface calibration block is placed parallel to the YOZ surface. Each block includes two mutually perpendicular slits; each slit allows the laser beam to pass completely through. The laser beam from the XOZ surface laser sight passes through the slits on the XOZ surface calibration block to achieve zero-position calibration of the robotic arm's XOZ surface, and the laser beam from the YOZ surface laser sight passes through the slits on the YOZ surface calibration block to achieve zero-position calibration of the robotic arm's YOZ surface. This ensures the accuracy and repeatability of multiple tests.

[0024] 3. This invention provides a test system for T / R components based on open-feed systems, comprising a passive antenna fixture. The passive antenna fixture includes an antenna array identical to the T / R component under test, and an SMA connector and adapter cable identical to those on the adapter fixture. The adapter cable includes an adapter cable from the SMA connector to the switching amplifier component. The passive antenna fixture is used in the test link to replace the adapter fixture and the T / R component under test to obtain data results on the influence of antenna elements on the open-feed test. Based on the performance indicators of the transmit and receive links of each antenna element of the T / R component under test and the corresponding transmit and receive links of the antenna elements in the antenna fixture, the final test result of the T / R component is obtained. This achieves an accurate and reliable test system for T / R components based on open-feed systems.

[0025] 4. The integrated control system of this invention, based on an air-feed T / R component testing method, achieves precise control of the robotic arm through accurate transformation between the robotic arm coordinate system (cylindrical coordinate system) and the antenna coordinate system (which may be a rectangular coordinate system or a spherical coordinate system, depending on the array configuration of the device under test). This ensures that the antenna probe's position in the XOY plane and its perpendicular distance to the T / R component under test are within a very small error range each time. The robotic arm body is embedded in the outer cavity behind the absorbing material on the side of the shielded dark box, minimizing the influence of the robotic arm's metal exterior on the dark box testing.

[0026] 5. The present invention provides a test method for T / R components based on open feed. The final performance indicators of the T / R component under test are obtained by subtracting the corresponding indicators of the transmitting link output power, efficiency, waveform drop and leading / falling edges of the detector envelope of each antenna element of the T / R component under test from the corresponding indicators of the transmitting link in the antenna fixture. Similarly, the final performance indicators of the receiving link are obtained by subtracting the corresponding indicators of the receiving link in the antenna fixture from the gain, noise figure, and input 1dB power compression point P-1 performance indicators of each antenna element of the T / R component under test. Furthermore, the final performance indicators are obtained by directly using the phase shift RMS and parasitic amplitude modulation of the transmitting link, and the phase shift RMS, parasitic amplitude modulation, attenuation RMS, and parasitic phase modulation of the receiving link as the final performance indicators. This method eliminates the influence of antenna elements on the open feed test, making it an accurate test method for T / R components based on open feed.

[0027] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0028] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0029] Figure 1 This is a schematic diagram showing the positions of the laser sight and the test piece in a T / R component testing system based on air feed.

[0030] Figure 2 This is a schematic diagram of the structural composition of a T / R component testing system based on air-feed.

[0031] Figure 3 This is a schematic diagram showing the composition and connection relationship of the switching amplifier component in a test system for a T / R component based on open feed.

[0032] Figure 4 This is a schematic diagram showing the composition and connection relationship of the switching attenuation components in a test system for a T / R module based on air feeder.

[0033] Figure 5 This is a schematic diagram of the internal components and connections of a T / R component testing system based on air-feed.

[0034] Figure 6 This is a schematic diagram of the main view of a calibration block for a T / R component test system based on air feed.

[0035] Figure 7 This is a schematic side view of a calibration block for a T / R component test system based on air feed.

[0036] Figure 8 This is a top view schematic diagram of a calibration block for a T / R component test system based on air feed.

[0037] Figure label:

[0038] Laser emitter in a 1-XOZ surface laser sight;

[0039] Laser receiver in a 2-XOZ surface laser sight;

[0040] Laser receiver in a 3-YOZ surface laser sight;

[0041] Laser emitter in a 4-YOZ surface laser sight;

[0042] 5-Antenna probe. Detailed Implementation

[0043] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0044] A specific embodiment of the present invention discloses a T / R component testing system based on air-feed, such as... Figure 2 As shown. The testing system includes a shielded dark box assembly and a test cabinet assembly. The shielded dark box assembly includes a shielded dark box, a transition fixture, and a robotic arm set inside the shielded dark box. The shielded dark box includes an inner cavity and an outer cavity, with the inner cavity wall lined with absorbing material. The robotic arm body is located in the outer cavity of the shielded dark box, and the robotic arm grippers penetrate the inner cavity wall and extend into the inner cavity. An antenna probe 5 is fixed on the robotic arm grippers. The transition fixture is located at the bottom of the inner cavity of the shielded dark box, and the T / R component under test is mounted on the transition fixture. The T / R component under test is electrically connected to the test cabinet assembly through the transition fixture. Multiple antenna elements are set on the circuit board of the T / R component under test. The robotic arm drives the antenna probe 5 to move directly above the antenna elements on the T / R component under test and at a preset distance from each antenna element on the T / R component under test. Signal transmission is performed between the antenna probe 5 and the antenna elements on the T / R component under test, so that the test cabinet assembly, the antenna probe 5, and the T / R component under test form a transmission or reception link, thereby realizing the performance testing of the T / R component.

[0045] Specifically, the shielded dark box is used to provide a calibrable electromagnetic shielding environment for space power supply testing, so as to reduce the interference of external electromagnetic fields on the test inside the shielded dark box, and to provide a reflection-free condition for space power supply, so as to reduce the impact of multipath effect on test accuracy. In addition, the position at the bottom of the inner cavity of the shielded dark box where the adapter tool is installed adopts a partial hollow design, which facilitates the connection of the adapter tool's docking cable to the integrated control computer or switch amplifier component inside the cabinet below the shielded dark box.

[0046] The antenna probe 5 inside the shielded dark box is used to transmit the feed power of the vector network analyzer port into space during the receive test, and the T / R component under test completes the reception. During the transmit test, it is used to receive the transmit power of the T / R component under test and transmit it to the vector network analyzer after attenuation by the switching attenuation component, so as to perform closed-loop air feed test.

[0047] The robotic arm inside the shielded dark box is used to align the antenna probe 5 with the open antenna array element on the test component according to the programmable instructions issued by the integrated control machine (maintaining a certain distance between the antenna probe 5 and the antenna of the T / R component under test). It is also used in conjunction with the laser aiming device on the adapter fixture for calibration to ensure that the distance and horizontal position (X,Y) between the antenna probe 5 and the T / R component under test have sufficient repeatability after multiple movements of the robotic arm during the test. The robotic arm body is embedded in the outer cavity behind the absorbing material on the side of the shielded dark box to minimize the influence of the robotic arm's metal surface on the dark box test.

[0048] The test cabinet assembly is located below the shielded dark box. The assembly includes a switching attenuation component, a switching amplification component, a vector network analyzer, and a control unit. The control unit connects to the vector network analyzer, robotic arm, switching amplification component, and switching attenuation component via an Ethernet interface and processes the test results. One end of the switching amplification component is connected to an adapter fixture, and the other end is connected to the signal input / output port of the vector network analyzer. The switching amplification component provides gain amplification for the signal output by the T / R component under test or the vector network analyzer during the transmit / receive test according to the programmable commands issued by the control unit. One end of the switching attenuation component is connected to antenna probe 5, and the other end is connected to the signal input port of the vector network analyzer. The switching attenuation component attenuates the signal transmitted to the vector network analyzer during the test.

[0049] Specifically, the vector network analyzer is a conventional microwave / RF test and measurement instrument used to perform S-parameter testing, gain compression testing, and noise figure testing of two-port networks based on the integrated control unit's programmable instructions and the internal hardware and software of the vector network analyzer (S-parameter testing is a basic function of the vector network analyzer; gain compression and noise figure testing can be performed directly by the vector network analyzer with relevant optional accessories).

[0050] The integrated control unit is one of the core components of the entire test. Its core is an industrial computer used to coordinate and communicate with all other components in the entire test system. Through its internal I / O controller, which uses a CPCI board, it realizes the logic control of the T / R component under test. Through its internal standard programmable power supply, it realizes the controllable power supply of the T / R component under test. Through the industrial Ethernet RJ45 interface, it realizes communication and control with the vector network analyzer, robotic arm, switching amplifier component, and switching attenuation component. The RJ45 interface of the robotic arm is located in the outer cavity of the shielded dark box and is shielded by the side absorbing material. Finally, the integrated control unit processes the test data results and stores them on the local hard drive.

[0051] The switching amplifier assembly includes a first single-pole double-throw relay, a first directional amplifier, a second directional amplifier, a second single-pole double-throw relay, a power divider, and multiple single-pole single-throw relays;

[0052] The input terminal of the first directional amplifier is connected to the normally closed contact of the first single-pole double-throw relay, and the output terminal is connected to the normally closed contact of the second single-pole double-throw relay; the input terminal of the second directional amplifier is connected to the normally open contact of the second single-pole double-throw relay, and the output terminal is connected to the normally open contact of the first single-pole double-throw relay; the stationary terminal of the first single-pole double-throw relay serves as the input and output ports of the switching amplifier assembly; the stationary terminal of the second single-pole double-throw relay is connected to one end of the power divider, and multiple ports on the other end of the power divider are respectively connected to the SMA connector of the adapter fixture through a single-pole single-throw relay.

[0053] Specifically, the internal structure of the switching amplification component is as follows: Figure 3 As shown. The switching amplifier assembly provides gain amplification for the signal output by the T / R group under test or the vector network analyzer during the transmit / receive test, according to the programmable commands issued by the integrated control unit. The switching amplifier assembly includes two directional amplifiers, two single-pole double-throw relays, a power divider (1 to 16), and 16 single-pole single-throw relays. The first directional amplifier is located in the transmit test link, and the second directional amplifier is located in the receive test link. The integrated control unit controls the moving contacts of the first and second single-pole double-throw relays to simultaneously connect to normally open or normally closed contacts. When both are connected to normally open contacts, the transmit test link is connected; when both are connected to normally closed contacts, the receive test link is connected. Each channel of the power divider is connected to one single-pole single-throw relay. The integrated control unit is also used to control the single-pole single-throw relays to open or close. Closed single-pole single-throw relays are used to select antenna array elements.

[0054] The switching attenuation component includes a third single-pole double-throw relay, a 20dB coaxial attenuator, and a fourth single-pole double-throw relay. The input terminal of the 20dB coaxial attenuator is connected to the normally open contact of the fourth single-pole double-throw relay, and the output terminal is connected to the normally open contact of the third single-pole double-throw relay. The stationary terminal of the third single-pole double-throw relay serves as the input and output ports of the switching attenuation component. The stationary terminal of the fourth single-pole double-throw relay is connected to the antenna probe 5. The normally closed contact of the third single-pole double-throw relay is connected to the normally closed contact of the fourth single-pole double-throw relay.

[0055] During the transmit test of the T / R module under test, the integrated control unit controls the first to fourth single-pole double-throw relays to connect the transmit test link. The T / R module under test opens the transmit link of the channel under test, and the single-pole single-throw relay of the channel under test closes. The pulse excitation signal output by the vector network analyzer is amplified by the first directional amplifier and then divided by the power divider before being input to the SMA connector on the adapter board. The signal received by the SMA connector is then input to the T / R module under test through the SSMP connector. The transmit power signal of the channel under test of the T / R module under test is received by the antenna probe 5, then attenuated by 20dB by the switch attenuation combination, and finally returns to the right port of the vector network analyzer. During the receive test of the T / R module under test, under the control of the integrated control unit, the first to fourth single-pole double-throw relays connect the receive test link. The T / R module under test opens the receive link of the channel under test, and the single-pole single-throw relay of the channel under test closes. The robotic arm moves the antenna probe 5 directly above the antenna element of the corresponding opened channel. Figure 2The right port of the vector network analyzer outputs a transmit pulse excitation signal. The pulse excitation signal is received by the switch attenuation component and then excites the antenna probe 5. The channel of the T / R component under test receives the transmit signal from the antenna probe 5 through the corresponding antenna array element. After passing through the receiving link of the T / R component under test, it is transmitted to the receiving link of the switch amplification component. After being amplified by the receiving link of the switch amplification component, it returns to the left port of the vector network analyzer. The vector network analyzer then completes the analysis of the returned signal.

[0056] The internal structure of the switching attenuation component is as follows Figure 4 As shown, it switches between the receive test link and the transmit test link during the transmit / receive test according to the programmable commands issued by the integrated control unit. In the transmit test link, the switching attenuation component receives the signal detected by the antenna probe 5 and attenuates the signal by 20dB to ensure that the signal power returning to the vector network analyzer is within the instrument's safe range. The switching attenuation component includes a single-pole double-throw switch and a 20dB coaxial attenuator. When the integrated control unit sends a control signal to simultaneously connect the moving contacts of the third and fourth single-pole double-throw relays to their normally open contacts, the transmit test link is activated; when the integrated control unit sends a control signal to simultaneously connect the moving contacts of the third and fourth single-pole double-throw relays to their normally closed contacts, the receive test link is activated.

[0057] The shielded anechoic chamber assembly also includes laser sights; the laser sights include an XOZ-plane laser sight and a YOZ-plane laser sight, which are respectively mounted on two opposite corners of the adapter fixture; both the XOZ-plane and YOZ-plane laser sights include a laser emitter and a laser receiver; the laser beam direction in the XOZ-plane laser sight is perpendicular to the XOZ-plane; the laser beam direction in the YOZ-plane laser sight is perpendicular to the YOZ-plane.

[0058] The calibration block includes an XOZ surface calibration block and a YOZ surface calibration block; the XOZ surface calibration block and the YOZ surface calibration block are two rectangular pieces placed perpendicularly to each other; one side of the two rectangular pieces is joined to form an L-shape; the top of the XOZ surface calibration block and the YOZ surface calibration block are fixed to the gripper of the robotic arm by a mounting plate; the XOZ surface calibration block is placed parallel to the XOZ surface, and the YOZ surface calibration block is placed parallel to the YOZ surface; wherein, the mounting surface of the adapter tool is the XOY plane, the direction from left to right on the mounting surface of the adapter tool is the positive X-axis direction, the direction from bottom to top on the mounting surface of the adapter tool is the positive Y-axis direction, and the direction perpendicular to the mounting surface of the adapter tool is the positive Z-axis direction; each of the two rectangular pieces includes two mutually perpendicular slits; the laser beam in the XOZ surface laser sight passes through the slits on the XOZ surface calibration block to achieve zero-position calibration of the robotic arm's XOZ surface, and the laser beam in the YOZ surface laser sight passes through the slits on the YOZ surface calibration block to achieve zero-position calibration of the robotic arm's YOZ surface.

[0059] Specifically, to ensure the repeatability of multiple tests, the robot arm's coordinates must be calibrated before the test begins. Coordinate calibration is achieved using a calibration block on the robot arm's gripper and a laser sight on the adapter fixture. A schematic diagram of the calibration block structure is shown below. Figure 6-8 As shown, the laser sight is installed in the following position. Figure 1 As shown. The calibration block is a two-sided structure with two mutually perpendicular narrow slits on the front and left sides, allowing the laser beam to pass completely through. The adapter fixture has two laser sights, each consisting of a laser emitter and a laser receiver. The two sets of laser sights are located at opposite corners of the fixture, and the laser beams emitted by the two sets are perpendicular to each other. The laser sights are positioned so that the laser beam emitted by the lower right laser sight is perpendicular to the XOZ plane. The robotic arm moves the calibration block so that it is positioned between the lower right laser emitter 1 and laser receiver 2. The Z-axis is determined when the position of the XOZ plane calibration block is finely adjusted so that the laser beam passes precisely through the horizontal slit on the XOZ plane calibration block. The zero position of the X-axis is determined when the position of the XOZ surface calibration block is finely adjusted so that the laser beam passes exactly through the vertical slit on the XOZ surface calibration block. The robotic arm moves the calibration block so that the YOZ surface calibration block is located between the laser emitter 4 and the laser receiver 3 in the upper left corner. The laser emitted by the laser sight in the upper left corner is perpendicular to the YOZ surface. When the position of the YOZ surface calibration block is finely adjusted so that the laser beam passes through the vertical slit on the YOZ surface calibration block, the zero position of the Y-axis is determined. When the position of the YOZ surface calibration block is finely adjusted so that the laser beam passes through the horizontal slit on the YOZ surface calibration block, the zero position of the Z-axis is confirmed again. The robotic arm transmits the zero position coordinates of the X, Y, and Z axes to the integrated control computer to realize the calibration of the origin of the rectangular coordinate system. In addition, the integrated control unit achieves precise control of the robotic arm by accurately converting between the robotic arm coordinate system (cylindrical coordinate system) and the antenna coordinate system (which may be a rectangular coordinate system or a spherical coordinate system, depending on the array configuration of the device under test). This ensures that the position of the antenna probe 5 in the XOY plane and its vertical distance from the T / R component under test are within a very small error range each time.

[0060] The adapter fixture includes J30JM, SSMP, and SMA connectors; the J30JM connector is used to connect to the low-frequency interface of the T / R component under test, the SSMP connector is used to connect to the high-frequency interface of the T / R component under test, and the SMA connector is used to connect to the switching amplifier component; the J30JM connector is used to connect to the integrated control unit.

[0061] Specifically, the internal structure of the adapter tool inside the shielded anechoic box is as follows: Figure 5As shown, it is used to convert the external high-frequency interface of the T / R component under test into an SMA / K type interface (hole) to mate with the SMA / J type interface (pin) of the switching amplifier component; the external low-frequency interface is converted into a J30JM type interface to connect to the integrated control unit, so that the T / R component under test can work normally according to the instructions of the integrated control unit and complete the closed-loop transmission and reception test link. The shielded anechoic box assembly also includes a passive antenna fixture; the passive antenna fixture includes the same antenna array as the T / R component under test, as well as the same SMA connector and adapter cable as the adapter fixture; the adapter cable is used to connect the SMA connector to the switching amplifier component; the passive antenna fixture is used in the test link to replace the adapter fixture and the T / R component under test to obtain the data results of the influence of the antenna array elements on the open feed test.

[0062] Specifically, to improve the accuracy of the open-feed test, before or after the test, a passive antenna fixture with a passive antenna module identical to the antenna elements on the T / R component under test is installed on the bottom of a shielded dark box, replacing the adapter fixture and the T / R component under test. The spatial position of the antenna elements is consistent with that of the T / R component under test, and the connecting SMA / K cable for each antenna element is installed on the corresponding SMA / J interface of the switching amplifier component (the correspondence is completely consistent with that of the T / R component under test). The passive antenna fixture is then tested again according to the above test method for the receiving and transmitting links of the T / R component under test, and the data is recorded. By comparing the data of the T / R component under test with the data of the passive antenna fixture, the influence of the antenna elements on the open-feed test can be eliminated, and accurate transmit and receive link performance indicators of the T / R component under test can be obtained.

[0063] Another embodiment of the present invention provides a T / R component testing method, the method comprising:

[0064] Connect the T / R component under test, the adapter fixture, and the test cabinet assembly. The robotic arm moves the antenna probe 5 directly above the first antenna element to test the performance indicators of the first antenna element's transmit and receive links. The robotic arm then moves the antenna probe 5 sequentially above each of the remaining antenna elements to complete the same tests as the first antenna element.

[0065] Remove the T / R component and adapter fixture from the test chamber. Install the passive antenna fixture at the bottom of the shielded dark box and connect it to the test cabinet assembly. Move the robotic arm antenna probe 5 directly above the first antenna element of the passive antenna fixture to test the performance indicators of the transmission and reception links of the first antenna element. Move the robotic arm antenna probe 5 sequentially above the remaining antenna elements of the passive antenna fixture to complete the same tests as the first antenna element, and obtain the performance indicators of the transmission and reception links of each antenna element.

[0066] The final test results of the T / R component are obtained based on the performance indicators of the transmit and receive links of each antenna element in the T / R component under test and the performance indicators of the transmit and receive links of the corresponding antenna elements in the passive antenna fixture.

[0067] Specifically, the testing process for space-fed T / R modules is as follows:

[0068] When testing the transmission performance of the T / R module under test, under the control of the integrated control unit, the switching amplification component and the switching attenuation component are connected to the transmission test link. The T / R module under test opens the transmission link of the channel under test, and the robotic arm moves the antenna probe 5 directly above the antenna element of the corresponding opened channel. Figure 2 The left port of the vector network analyzer outputs a transmit pulse excitation signal, which is then used by the directional amplifier of the transmit test link in the switching amplifier assembly and the antenna array element channel switching switch to excite the transmit channel of the T / R component under test. The transmit power signal of the T / R component under test is received by the antenna probe 5 via an open feed, then attenuated by 20dB by the switching attenuation combination, and finally returns to the right port of the vector network analyzer. The vector network analyzer analyzes the returned signal, extracts the S-parameters and power parameters of the system, and stores them in the integrated control computer for processing. Combined with the various supply currents recorded by the standard power supply, the output power, efficiency, top drop, and leading and trailing edges of the current channel transmit link are obtained. Then, the phase shifter of the transmit branch inside the T / R component is adjusted by the integrated control computer to test the phase shift RMS, parasitic amplitude modulation, and other indicators of the current channel transmit link. Finally, by moving the robotic arm to the corresponding position of other channels, the above process is repeated to complete the full indicator test of the other channels transmit.

[0069] When testing the reception performance of the T / R module under test, under the control of the integrated control unit, the switching amplification component and the switching attenuation component are connected to the reception test link. The T / R module under test opens the reception link of the channel under test, and the robotic arm moves the antenna probe 5 directly above the antenna element of the corresponding opened channel. Figure 2The right port of the vector network analyzer outputs a transmit pulse excitation signal. This pulse excitation signal is received by the switching attenuation component and then excites antenna probe 5. The channel of the T / R component under test receives the transmit signal from antenna probe 5 through the corresponding antenna array element. After passing through the receiving link of the T / R component under test, the signal is transmitted to the receiving link of the switching amplification component. After being amplified by the receiving link of the switching amplification component, the signal returns to the left port of the vector network analyzer. The vector network analyzer analyzes the returned signal, extracts the S-parameters, gain compression parameters, and noise parameters of the system, and stores them in the integrated control computer for processing. This yields the gain, noise figure, input P-1, and other indicators of the current channel's receiving link. Then, the phase shifter and attenuator of the receiving branch inside the T / R component under test are adjusted by the integrated control computer to test the phase shift RMS, parasitic amplitude modulation, attenuation RMS, and parasitic phase modulation indicators of the receiving link. Finally, the robotic arm is moved to the corresponding position of the other channels, and the above process is repeated to complete the receiving indicator tests of the other channels.

[0070] The final test results of the T / R module are obtained based on the performance indicators of the transmit and receive links of each antenna element in the T / R module under test and the corresponding transmit and receive links of the antenna elements in the passive antenna fixture. This includes: subtracting the corresponding indicators of the transmit links of the antenna elements in the passive antenna fixture from the output power, efficiency, waveform drop and leading / falling edges of the transmit links of each antenna element in the T / R module under test to obtain the final performance indicators of the corresponding items of the transmit links of the T / R module under test; subtracting the corresponding indicators of the receive links of the antenna elements in the passive antenna fixture from the gain, noise figure, and input 1dB power compression point P-1 performance indicators of the receive links of each antenna element in the T / R module under test to obtain the final performance indicators of the corresponding items of the receive links of the T / R module under test; and directly using the phase shift RMS, parasitic amplitude modulation, attenuation RMS, and parasitic phase modulation indicators of the transmit links of the T / R module under test as the final performance indicators.

[0071] Specifically, the passive antenna fixture is used in the test link to replace the adapter fixture and the T / R component under test (DUT) to obtain data results on the impact of antenna elements on the open feed test. The transmit link output power, efficiency, waveform drop and leading / falling edges of the detector envelope, and the receive link gain, noise figure, and input 1dB power compression point P-1 parameters require subtracting the corresponding test results of the passive antenna fixture from the test results of the DUT and the adapter fixture. The transmit link phase shift RMS, parasitic amplitude modulation, and receive link phase shift RMS, parasitic amplitude modulation, attenuation RMS, and parasitic phase modulation parameters use the test results of the DUT component as the final test results.

[0072] Compared with existing technologies, this embodiment provides a T / R module testing system based on space-fed technology, including a transfer fixture and a robotic arm in a shielded dark box. The robotic arm body is located in the outer cavity of the shielded dark box, and the robotic arm gripper is located in the inner cavity of the shielded dark box, with an antenna probe 5 fixed on the robotic arm gripper. The transfer fixture is set on the lower wall of the inner cavity of the shielded dark box, and the T / R module under test is installed on the transfer fixture. The T / R module under test is electrically connected to the test cabinet assembly through the transfer fixture. The robotic arm drives the antenna probe 5 to move directly above the antenna elements on the T / R module under test and at a preset distance from each antenna element on the T / R module under test. Signal transmission is carried out between the antenna probe 5 and the antenna elements on the T / R module under test, so that the test cabinet assembly, the antenna probe 5, and the T / R module under test form a transmit or receive link, thereby realizing the performance testing of the T / R module. This is a system for quantitatively testing the technical indicators of analog phased array T / R modules that cannot be separated from the antenna through space-fed technology. This embodiment provides a T / R component testing system based on air feed, including a laser sight and a calibration block. The laser sight includes an XOZ-plane laser sight and a YOZ-plane laser sight, which are respectively mounted on two opposite corners of the adapter fixture. Both the XOZ-plane and YOZ-plane laser sights include a laser emitter and a laser receiver. The laser beam direction in the XOZ-plane laser sight is perpendicular to the XOZ-plane, and the laser beam direction in the YOZ-plane laser sight is perpendicular to the YOZ-plane. The calibration block includes an XOZ surface calibration block and a YOZ surface calibration block. The top surfaces of both blocks are fixed to the robotic arm gripper via a mounting plate. The XOZ and YOZ surface calibration blocks are placed parallel to the XOZ surface, and the YOZ surface calibration block is placed parallel to the YOZ surface. Each block includes two mutually perpendicular slits; each slit allows the laser beam to pass completely through. The laser beam from the XOZ surface laser sight passes through the slits on the XOZ surface calibration block to achieve zero-position calibration of the robotic arm's XOZ surface, and the laser beam from the YOZ surface laser sight passes through the slits on the YOZ surface calibration block to achieve zero-position calibration of the robotic arm's YOZ surface. This ensures the accuracy and repeatability of multiple tests. This embodiment provides a test system for T / R components based on open-feed technology, including a passive antenna fixture. The passive antenna fixture includes an antenna array identical to the T / R component under test (DUT), and an SMA connector and adapter cable identical to those on the adapter fixture. The adapter cable includes an adapter cable from the SMA connector to the switching amplifier component. The passive antenna fixture is used in the test link to replace the adapter fixture and the DUT to obtain data results on the impact of antenna elements on open-feed testing. Based on the performance indicators of the transmit and receive links of each antenna element of the DUT and the corresponding transmit and receive links of the antenna elements in the antenna fixture, the final test result of the T / R component is obtained. This achieves an accurate and reliable test system for T / R components based on open-feed technology.This embodiment provides a T / R component testing method based on open-feed. The integrated control system achieves precise control of the robotic arm by accurately converting between the robotic arm coordinate system (cylindrical coordinate system) and the antenna coordinate system (which may be a Cartesian coordinate system or a spherical coordinate system, depending on the array configuration of the device under test). This ensures that the position of the antenna probe 5 in the XOY plane and its perpendicular distance to the T / R component under test are within a very small error range each time. The robotic arm body is embedded in the outer cavity behind the absorbing material on the side of the shielded dark box, minimizing the influence of the robotic arm's metal exterior on the dark box testing. This embodiment provides a test method for T / R components based on open feed. The final performance indicators of the T / R component's transmit link are obtained by subtracting the corresponding indicators from the antenna fixture's transmit link output power, efficiency, and waveform drop and leading / falling edges of the detector envelope for each antenna element of the T / R component under test. Similarly, the final performance indicators of the T / R component's receive link are obtained by subtracting the corresponding indicators from the antenna fixture's receive link's gain, noise figure, and input 1dB power compression point P-1 performance indicators for each antenna element of the T / R component under test. Furthermore, the final performance indicators are obtained by directly using the phase shift RMS and parasitic amplitude modulation of the transmit link, and the phase shift RMS, parasitic amplitude modulation, attenuation RMS, and parasitic phase modulation of the receive link as the final performance indicators. This method eliminates the influence of antenna elements on the open feed test, making it an accurate test method for T / R components based on open feed.

[0073] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0074] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An air-fed based T / R module test system, characterized by, The testing system includes a shielded dark box assembly and a test cabinet assembly; the shielded dark box assembly includes a shielded dark box, as well as a transfer fixture and a robotic arm set in the shielded dark box; the shielded dark box includes an inner cavity and an outer cavity, and the inner cavity wall is provided with a wave-absorbing material; the robotic arm body is located in the outer cavity of the shielded dark box, and the robotic arm gripper passes through the inner cavity wall and extends into the inner cavity, and an antenna probe is fixed on the robotic arm gripper; The adapter fixture is located at the bottom of the shielded dark box. The T / R component under test is installed on the adapter fixture. The T / R component under test is electrically connected to the test cabinet component through the adapter fixture. Multiple antenna array elements are set on the circuit board of the T / R component under test. The robotic arm moves the antenna probe to a position directly above the antenna elements on the T / R component under test and at a preset distance from each antenna element. The antenna probe transmits signals to the antenna elements on the T / R component under test, forming a transmission or reception link between the test cabinet component, the antenna probe, and the T / R component under test, thereby enabling the performance testing of the T / R component.

2. The T / R assembly test system of claim 1, wherein, The test cabinet assembly is located below the shielded dark box; the test cabinet assembly includes a switch attenuation component, a switch amplification component, a vector network analyzer, and a control unit housed within the test cabinet; the control unit is connected to the vector network analyzer, robotic arm, switch amplification component, and switch attenuation component via an Ethernet interface, and processes the test results; One end of the switching amplifier assembly is connected to the adapter fixture, and the other end is connected to the signal input / output port of the vector network analyzer; The switching amplifier component is used to provide gain amplification for the signal output by the T / R component under test or the vector network analyzer during the transceiver test according to the programmable control instructions issued by the integrated control unit; one end of the switching attenuator component is connected to the antenna probe and the other end is connected to the signal input port of the vector network analyzer. The switching attenuation component is used to attenuate the signal transmitted to the vector network analyzer during testing.

3. The T / R assembly test system of claim 2, wherein, The switching amplifier assembly includes a first single-pole double-throw relay, a first directional amplifier, a second directional amplifier, a second single-pole double-throw relay, a power divider, and multiple single-pole single-throw relays; The input terminal of the first directional amplifier is connected to the normally closed contact of the first single-pole double-throw relay, and the output terminal is connected to the normally closed contact of the second single-pole double-throw relay; the input terminal of the second directional amplifier is connected to the normally open contact of the second single-pole double-throw relay, and the output terminal is connected to the normally open contact of the first single-pole double-throw relay; the stationary terminal of the first single-pole double-throw relay serves as the input and output ports of the switching amplifier component. The stationary terminal of the second single-pole double-throw relay is connected to one end of the power divider, and the multiple ports on the other end of the power divider are connected to the SMA connector of the adapter tool through a single-pole single-throw relay.

4. The T / R assembly test system of claim 2, wherein, The switching attenuation component includes a third single-pole double-throw relay, a 20dB coaxial attenuator, and a fourth single-pole double-throw relay. The input terminal of the 20dB coaxial attenuator is connected to the normally open contact of the fourth single-pole double-throw relay, and the output terminal is connected to the normally open contact of the third single-pole double-throw relay. The stationary terminal of the third single-pole double-throw relay serves as the input and output ports of the switching attenuation component. The stationary terminal of the fourth single-pole double-throw relay is connected to the antenna probe. The normally closed contact of the third single-pole double-throw relay is connected to the normally closed contact of the fourth single-pole double-throw relay.

5. The T / R assembly test system of claim 2, wherein, The adapter fixture includes J30JM, SSMP, and SMA connectors; the J30JM connector is used to connect to the low-frequency interface of the T / R component under test, the SSMP connector is used to connect to the high-frequency interface of the T / R component under test, and the SMA connector is used to connect to the switching amplifier component; the J30JM connector is used to connect to the integrated control unit.

6. The T / R assembly test system of claim 1, wherein, The shielded anechoic chamber assembly also includes laser sights; the laser sights include an XOZ-plane laser sight and a YOZ-plane laser sight, which are respectively mounted on two opposite corners of the adapter fixture; both the XOZ-plane and YOZ-plane laser sights include a laser emitter and a laser receiver; the laser beam direction in the XOZ-plane laser sight is perpendicular to the XOZ-plane; the laser beam direction in the YOZ-plane laser sight is perpendicular to the YOZ-plane.

7. The T / R assembly test system of claim 6, wherein, The calibration block includes an XOZ surface calibration block and a YOZ surface calibration block; the XOZ surface calibration block and the YOZ surface calibration block are two rectangular pieces placed perpendicularly to each other; one side of the two rectangular pieces is joined to form an L-shape; the top of the XOZ surface calibration block and the YOZ surface calibration block are fixed to the gripper of the robotic arm by a mounting plate; the XOZ surface calibration block is placed parallel to the XOZ surface, and the YOZ surface calibration block is placed parallel to the YOZ surface; wherein, the mounting surface of the adapter tool is the XOY plane, the direction from left to right on the mounting surface of the adapter tool is the positive X-axis direction, the direction from bottom to top on the mounting surface of the adapter tool is the positive Y-axis direction, and the direction perpendicular to the mounting surface of the adapter tool is the positive Z-axis direction; each of the two rectangular pieces includes two mutually perpendicular slits; the laser beam in the XOZ surface laser sight passes through the slits on the XOZ surface calibration block to achieve zero-position calibration of the robotic arm's XOZ surface, and the laser beam in the YOZ surface laser sight passes through the slits on the YOZ surface calibration block to achieve zero-position calibration of the robotic arm's YOZ surface.

8. The T / R assembly test system of claim 5, wherein, The shielded anechoic chamber assembly also includes passive antenna fixtures; The passive antenna fixture includes the same antenna array as the T / R component under test, as well as the same SMA connector and adapter cable as the adapter fixture; The adapter cable is used to connect the SMA connector to the switching amplifier assembly; Passive antenna fixtures are used in test links to replace adapter fixtures and T / R components under test to obtain data results on the impact of antenna array elements on open feed tests.

9. The method of testing a T / R assembly test system of claims 1-8, wherein, The method includes: Connect the T / R component under test, the adapter fixture, and the test cabinet assembly. The robotic arm moves the antenna probe directly above the first antenna element to test the performance indicators of the first antenna element's transmit and receive links. The robotic arm then moves the antenna probe sequentially above each of the remaining antenna elements to complete the same tests as the first antenna element. Remove the T / R component and adapter fixture from the test chamber. Install the passive antenna fixture at the bottom of the shielded dark box and connect it to the test cabinet assembly. Move the robotic arm to move the antenna probe directly above the first antenna element of the passive antenna fixture and test the performance indicators of the transmit and receive links of the first antenna element. Move the robotic arm antenna probe to the top of each of the remaining antenna elements of the passive antenna fixture in sequence to complete the same tests as the first antenna element, and obtain the performance indicators of the transmit and receive links of each antenna element. The final test results of the T / R component are obtained based on the performance indicators of the transmit and receive links of each antenna element in the T / R component under test and the performance indicators of the transmit and receive links of the corresponding antenna elements in the passive antenna fixture.

10. The T / R assembly test method of claim 9, wherein, The final test results of the T / R module are obtained based on the performance indicators of the transmit and receive links of each antenna element in the T / R module under test and the corresponding transmit and receive links of the antenna elements in the passive antenna fixture. This includes: subtracting the corresponding indicators of the transmit links of the antenna elements in the passive antenna fixture from the output power, efficiency, waveform drop and leading / falling edges of the transmit links of each antenna element in the T / R module under test to obtain the final performance indicators of the corresponding items of the transmit links of the T / R module under test; subtracting the corresponding indicators of the receive links of the antenna elements in the passive antenna fixture from the gain, noise figure, and input 1dB power compression point P-1 performance indicators of the receive links of each antenna element in the T / R module under test to obtain the final performance indicators of the corresponding items of the receive links of the T / R module under test; and directly using the phase shift RMS, parasitic amplitude modulation, attenuation RMS, and parasitic phase modulation indicators of the transmit links of the T / R module under test as the final performance indicators.

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