A high-precision temperature control method for amplitude-phase distribution test

Abstract

The application discloses a high-precision temperature control method for amplitude and phase distribution test, and belongs to the technical field of electronic test and measurement. The temperature control method adopts piecewise infrared cage irradiation to control the temperature of an extended bidirectional test assembly, a test coupler and a short cable connecting the two in a hot vacuum tank; the temperature control method adopts an accurate temperature control aluminum tank to accurately control the temperature of a test cable connecting the extended bidirectional test assembly and a flange plate in the hot vacuum tank; and the temperature control method uses an out-of-tank temperature control box to connect an out-of-tank temperature control aluminum tank to control the temperature of the test cable outside the hot vacuum tank. Through the temperature control treatment at different positions, the test difficulty of amplitude and phase distribution of a multi-beam synthesis satellite in a hot vacuum test is solved, and accurate measurement of the amplitude and phase consistency of a satellite transponder core index is realized.

Description

Technical Field

[0001] This invention relates to a high-precision temperature control method for amplitude and phase distribution testing, belonging to the field of electronic testing and measurement technology. Background Technology

[0002] Mobile communication satellites provide wide-coverage, high-quality voice, SMS, fax, and data services to various mobile users, supporting handheld mobile terminals. They complement and extend terrestrial mobile communication networks, forming an indispensable part of an integrated space-ground communication support system, and possess significant civilian and military value. Mobile communication satellites typically employ multi-beam configurations to achieve seamless coverage of user areas and frequency resource reuse. In their onboard multi-beam payload design, multiple transceivers share a common feed and are directly connected to a multi-channel array transponder. Whether the amplitude and phase distribution of the multi-channel array transponder matches the design values ​​directly affects the beam shape, pointing, and gain after beamforming, thus impacting C / I performance. Therefore, in the development of mobile communication satellites, in addition to routine channel performance testing, the amplitude and phase distribution characteristics of the multi-channel array transponder must also be tested and verified.

[0003] The phase stability of components in the testing system, such as RF test cables, RF switches, couplers, and adapters, is highly sensitive to temperature and can only operate within specific temperature ranges. To meet the requirements of multi-channel phase testing and complete the thermal vacuum test of multi-beam synthesized satellite payloads, it is necessary to study a high-precision temperature control method for amplitude and phase distribution testing. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a high-precision temperature control method for amplitude and phase distribution testing. By controlling the temperature of different parts of the beamforming satellite payload testing system, the problem of testing amplitude and phase distribution of multi-beamforming satellites in thermal vacuum tests is solved.

[0005] The technical solution of this invention is:

[0006] A high-precision temperature control method for amplitude and phase distribution testing, used to control the temperature of a beamforming satellite payload testing system, includes:

[0007] For the extended bidirectional test components, test couplers and cables connecting the two in the test system located in the hot vacuum chamber, a segmented infrared cage is used to control the temperature by irradiating from different directions through the infrared cage.

[0008] For the test cables in the test system that connect the extended bidirectional test components and the flange inside the hot vacuum chamber, a precision temperature-controlled aluminum tank is used for precise temperature control. The precision temperature-controlled aluminum tank consists of a temperature-controlled tank body and a top plate, forming an internal enclosed space for cable radiative heat exchange. The precision temperature-controlled tank body is divided into an inner tank body and an outer tank body. Heating pads are attached to the outer surface of the outer tank body and wrapped with multiple layers of heat insulation material. Cable separators made of screws and nuts are installed on the inner tank body to separate and orderly place each cable and keep it close to the inner wall.

[0009] For test cables located outside the hot vacuum tank in the testing system, an external temperature control box is used to connect to an external temperature control aluminum tank for temperature control.

[0010] Furthermore, the surface of the precision temperature-controlled aluminum tank is coated with a high emissivity material to enhance radiative heat exchange between the inner and outer tanks and the cable; the cable surface is coated with a high emissivity material to enhance radiative heat exchange.

[0011] Furthermore, the inner and outer tanks are fixed together by bolts, and polytetrafluoroethylene (PTFE) thermal insulation components are installed at the connection points to reduce heat conduction and ensure the temperature uniformity of the cable's radiative heat exchange environment.

[0012] Furthermore, precise temperature control is implemented for the test cable connecting the extended bidirectional test assembly and the flange within the hot vacuum chamber of the test system: thermocouples are installed as temperature measuring points on the test cable, the inner tank of the precise temperature-controlled aluminum tank, and the top plate. The temperature of the test cable measuring point is used as the target temperature, and the temperatures of the inner tank and the top plate of the precise temperature-controlled aluminum tank are used as auxiliary temperatures for control. During the test, the temperature of each measuring point is controlled within the required range by adjusting the heating power of the outer heating element.

[0013] Furthermore, a cylindrical aluminum trough is designed. The cylindrical aluminum trough has a single-layer structure, with the inner surface sprayed with black paint and the outer surface covered with heating elements and multiple layers of heat insulation components. The side of the precision temperature control aluminum trough closest to the flange is extended into the interior of the cylindrical aluminum trough.

[0014] Furthermore, temperature monitoring points are attached to the area near the flange end of the test cable. These monitoring points are used as the target temperature. The heating power of the outer heating element of the cylindrical aluminum channel is adjusted to control the temperature of the test cable in the area within the required range.

[0015] Furthermore, the test coupler, the extended bidirectional test assembly, and the cable connecting the two are encased in a steel outer frame. The steel outer frame is painted black on one side, and several infrared cages are fixed in the five directions of the steel outer frame: top, bottom, left, right, and front. Each infrared cage irradiates the area enclosed by the steel outer frame from different directions.

[0016] Furthermore, by adjusting the power of each infrared cage separately, the test coupler, cable, and extended bidirectional test assembly within the area can all be controlled within the required temperature range.

[0017] Furthermore, the external temperature control box is designed with heating belts and infrared lamps for temperature control. The heating belts are attached to the bottom plate of the temperature control box, the cables are placed on the partition of the temperature control box, and an infrared lamp is installed at the cylindrical position opposite the flange of the hot vacuum container wall to ensure that the through-wall flange and the cable adapter through the flange are also within the required temperature range. The outer surface of the temperature control box is wrapped with heat-insulating rubber and plastic cotton for insulation.

[0018] Furthermore, the infrared lamp power is adjusted to heat the flange and the cable adapter passing through the flange, and the temperature of the external test cable in the current area is controlled within the required range by adjusting the heating power of the heating belt of the external temperature control box.

[0019] Furthermore, heating elements are attached to the outer surface of the temperature-controlled aluminum tank outside the tank, and after the cable is placed, it is wrapped with heat-insulating rubber and plastic cotton for insulation.

[0020] Furthermore, the thermocouple temperature measurement point on the external test cable is used as the target temperature. By adjusting the heating power of the heating element in the external temperature control aluminum tank, the temperature of the external test cable in the current area is controlled within the required range.

[0021] The advantages of this invention compared to the prior art are:

[0022] (1) For the vacuum tank test system with a large number of cables between the extended bidirectional test component and the test coupler coupling port on the feed array, the connection is complex and the space is relatively small, the present invention designs a segmented infrared cage for temperature measurement and control, which solves the problem that it is difficult to implement temperature control using conventional heating elements due to the small space; at the same time, the infrared cage adopts a segmented design, which solves the difficulty of local temperature unevenness and inability to adjust caused by the overall temperature control of conventional integrated infrared cage, which is composed of test couplers, short cables and extended bidirectional test components.

[0023] (2) For the test cables inside the hot vacuum tank between the extended bidirectional test assembly and the flange, this invention designs a precisely temperature-controlled aluminum tank for temperature measurement and control. Cable separators made of screws and nuts tightly adhere each cable to the three inner walls of the temperature-controlled aluminum tank for precise temperature control. First, this solves the problem that the test cables do not meet the temperature control requirements in some locations due to the loose fit between the cables and the aluminum tank in conventional aluminum tanks. Second, it solves the problem that the cables are randomly and haphazardly placed in conventional aluminum tanks, resulting in different angle coefficients of the cables to the radiative heat transfer environment composed of the inner tank and the inner cover plate, which makes it impossible to achieve uniform test cable temperature. Thus, the amplitude and phase consistency of the test system under hot vacuum is achieved.

[0024] (3) The temperature changes drastically near the flange end of the cable. This invention designs a cylindrical aluminum tank for temperature measurement and control. This solves the problem that conventional vacuum tanks lack temperature control devices in the interlayer, resulting in drastic temperature changes and the problem that the temperature of the cable near the flange end is too low due to the aluminum tank being too close to the vacuum tank wall. This achieves amplitude and phase consistency of the entire testing system under thermal vacuum.

[0025] (4) The test cable outside the hot vacuum tank is long, and the ambient temperature along the way is generally lower than the temperature required by the test system. This invention designs an external temperature control box, which is connected to an external temperature control aluminum trough for temperature control. First, it solves the problem that conventional aluminum troughs cannot accommodate a large number of long cables from a structural perspective; second, by designing and installing infrared lamps in the cylindrical position directly opposite the flange of the hot vacuum container wall inside the external temperature control box, it solves the temperature control problem of the through-wall flange and the cable adapter through the flange. Attached Figure Description

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0027] Figure 1 This is a schematic diagram showing the change of cable phase with temperature.

[0028] Figure 2 This is a schematic diagram of the three temperature control sections of the temperature control system according to an embodiment of the present invention;

[0029] Figure 3 is a schematic diagram of the temperature-controlled aluminum tank according to an embodiment of the present invention. (a) is a cross-sectional view of the temperature-controlled aluminum tank, and (b) is a perspective view of the temperature-controlled aluminum tank.

[0030] Figure 4 is a schematic diagram of the cylindrical aluminum channel near the flange end of the cable inside the tank according to an embodiment of the present invention. (a) is a schematic diagram of the cross-sectional view of the cylindrical aluminum channel connection, and (b) is a three-dimensional view of the cylindrical aluminum channel.

[0031] Figure 5 is a schematic diagram of the external temperature control box structure according to an embodiment of the present invention. (a) is a three-dimensional view of the external temperature control box, and (b) is a connection diagram of the external temperature control box.

[0032] Figure 6 This is a temperature curve diagram of the extended bidirectional testing component according to an embodiment of the present invention;

[0033] Figure 7 This is a temperature curve of the SF104P_TVAC cable inside the tank according to an embodiment of the present invention;

[0034] Figure 8 This is a graph showing the difference in temperature range between high and low temperatures and normal temperature for channel 7 in Embodiment 7 of the present invention.

[0035] Figure 9This is a phase difference curve of high temperature, low temperature and normal temperature for channel 7 in Embodiment 7 of the present invention. Detailed Implementation

[0036] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0037] The beamforming satellite payload test system includes test couplers, extended bidirectional assemblies, test cables and signal generators, spectrum analyzers, power meters, frequency counters, vector network analyzers, and other test equipment. Among these, the phase stability of the cables and bidirectional assemblies is particularly sensitive to temperature. Figure 1 As shown, the phase characteristics of the SF104P / 2*11SMA-441_TVAC thermal vacuum cable exhibit a significant abrupt change around 20℃. To ensure amplitude and phase consistency among multiple RF channels in the ground test system, the cable temperature must be controlled above 20℃. A small-canister thermal vacuum test was conducted on the extended bidirectional test assembly to verify its temperature characteristics. The test results show that under a temperature of 35℃±10℃, the amplitude consistency of the test system meets ≤±0.3dB, and the phase consistency meets ≤±6°. Therefore, a strict temperature control method is required to ensure that the test system temperature is within 35℃±10℃.

[0038] This invention proposes a high-precision temperature control method for amplitude and phase distribution testing, which is as follows: Figure 2 As shown, it specifically includes three temperature control sections. The temperature of each temperature control section should be kept as consistent as possible to ensure the amplitude and phase consistency among multiple channels of the test system.

[0039] 1) In the first temperature control section, the in-tank testing system includes a test coupler, a short cable and an extended bidirectional test assembly, and is designed with a segmented infrared cage temperature control.

[0040] For the first temperature control section, the cables between the extended bidirectional test assembly and the test coupler coupling port on the feed array are numerous and complex, and the space is relatively small. Implementing temperature control using conventional heating elements would be difficult. Therefore, a segmented infrared cage design was adopted for temperature measurement and control. Six infrared cages enclose the test coupler, short cables, and extended bidirectional test assembly, positioned in the five cardinal directions (top, bottom, left, right, and front) of the area. The lower infrared cage is divided into two sections to control the temperature of the test coupler, short cables, and extended bidirectional test assembly. The infrared cage uses 40-angle steel as the frame, reinforced with supporting round tubes, and is coated on one side with vacuum low-temperature environment black paint, with a coverage factor of 0.4. The upper infrared cage measures 2.4m × 1.5m, the lower right infrared cage measures 2.4m × 0.9m, the lower left infrared cage measures 2.1m × 0.6m, the left and right infrared cages measure 2.4m × 2.1m, and the front infrared cage measures 2.1m × 1.5m. The infrared cage is installed using a rectangular top frame and four columns. The top frame and columns are made of 40mm square steel pipes, and the infrared cage is fixed with bolts. The test coupler, short cable, and extended bidirectional test assembly are mounted on the columns on both sides of the infrared cage using long screws, which can be pulled outwards by 350mm. This allows testers to enter the infrared cage after it covers the test system to perform system calibration operations on the front and back of the feed source.

[0041] Infrared cages irradiate this area from different directions. The temperature control strategy involves adjusting the power of each of the six infrared cages to target the thermocouple measuring points on the test coupler, short cable, and extended bidirectional test assembly. In the thermal vacuum test, by appropriately adjusting the power of each of the six infrared cages, it can be ensured that the test coupler, short cable, and extended bidirectional test assembly within the area are all controlled within the required temperature range.

[0042] 2) In the second temperature control section, the test cable inside the hot vacuum tank between the extended bidirectional test assembly and the flange is designed with a precise temperature-controlled aluminum tank for temperature control. Cable separators made of screws and nuts tightly attach each cable to the three inner walls of the temperature-controlled aluminum tank for precise temperature control.

[0043] The precision temperature-controlled aluminum trough mainly consists of a temperature-controlled trough body and a cover plate. The precision temperature-controlled trough body is divided into an inner trough body and an outer trough body, as shown in Figure 3(a). Heating elements are attached to the outer surface of the outer trough body and wrapped with 10 units of multi-layer thermal insulation material. Cable separators made of screws and nuts are installed on the inner trough body, allowing each cable to be placed separately and orderly against the inner wall, as shown in Figure 3(b). The enclosed space inside the precision temperature-controlled aluminum trough serves as the radiative heat exchange space for the cables. The entire surface of the temperature-controlled aluminum trough is coated with a high-emissivity material to enhance radiative heat exchange between the inner and outer trough bodies and between the trough and the cables. The cable surface is also coated with a high-emissivity material to enhance radiative heat exchange. The inner and outer trough bodies are fixed together with bolts, and PTFE thermal insulation components are installed at the connection points to reduce heat conduction and ensure temperature uniformity in the radiative heat exchange environment of the cables. The top plate is not wrapped with multi-layer material to ensure a certain degree of heat dissipation when high-power cables generate heat. Cable separators installed on the inner tank separate and arrange each cable in an orderly manner, ensuring no obstruction between cables. Each cable has approximately the same angular coefficient relative to the radiative heat exchange environment formed by the inner tank and inner cover plate. By adjusting the temperature of the inner tank, structural uniformity of temperature is achieved for each cable. The temperature control strategy involves adjusting the heating power of the outer heating element to use the thermocouple temperature measurement point on the test cable as the target temperature, while the temperature measurement points on the inner layer and top plate of the precisely controlled aluminum tank serve as auxiliary target temperatures. During the thermal vacuum test, the temperature of the test cable can be controlled within a precise range by appropriately adjusting the heating element power.

[0044] The cable near the satellite end extends from the precision temperature-controlled aluminum groove to the end of the extended bidirectional test assembly for connection. Part of this cable is within the irradiation range of the segmented infrared cage, which controls the temperature. The part of the cable that exits the precision temperature-controlled aluminum groove but does not enter the irradiation range of the segmented infrared cage is designed to avoid excessively low temperatures by wrapping it with multiple layers of thermal insulation material.

[0045] Near the flange end of the cable, in the vacuum tank interlayer, temperature fluctuations are significant. Without temperature control, this would affect the test system's temperature control range of 35℃±10℃. A cylindrical aluminum trough is designed to address this issue. The cylindrical aluminum trough is a single-layer structure, 700mm long, as shown in Figure 4(b). The inner surface is painted black, and the outer surface is fitted with heating elements and covered with a 10-unit multi-layer thermal insulation assembly. The precise temperature control aluminum trough should extend deep into the cylindrical aluminum trough to ensure effective temperature control, as shown in Figure 4(a). Temperature monitoring is required at the cable near the flange end. The temperature control strategy involves adjusting the heating power of the heating elements on the outer layer of the cylindrical aluminum trough to use the thermocouple temperature measurement point near the flange end of the test cable as the target temperature. During the thermal vacuum test, by appropriately adjusting the heating element power, the temperature of the test cable near the flange end can be controlled within the required range.

[0046] 3) In the third temperature control section, the external test cable of the hot vacuum tank is designed to connect the external temperature control box to the external temperature control aluminum tank for temperature control.

[0047] The external test cable of the hot vacuum vessel connects to the ground test equipment from the flange end outside the vessel. This cable section is long, and the ambient temperature along its path is generally lower than the required temperature of the test system, necessitating active temperature control. An external temperature control box is designed, as shown in Figure 5(a), connecting to an external temperature control aluminum trough for temperature control, leading the cable to the ground test equipment. The external temperature control box solves the structural problem of accommodating a large number of cables. The external cable extends from the flange end, with the excess portion coiled inside the external temperature control box, leaving a suitable length to pass through the external temperature control aluminum trough and lead to the ground test equipment. The external temperature control box is designed with heating strips and infrared lamps for temperature control, as shown in Figure 5(b). The heating strips are attached to the bottom plate of the temperature control box, the cable is placed on the partition plate, and an infrared lamp is installed at the cylindrical position directly opposite the flange of the hot vacuum vessel wall to ensure that the flange passing through the wall and the cable adapter passing through the flange are also within the required temperature range. The outer surface of the temperature control box is wrapped with heat-insulating rubber and plastic cotton. Heating elements are attached to the outer surface of the external temperature-controlled aluminum trough. After the cable is placed, it is wrapped with insulating rubber and plastic cotton. The temperature control strategy of the external testing system for the thermal vacuum tank involves adjusting the power of the infrared lamps to heat the through-wall flange and the cable adapter through the flange. The target temperature is controlled by adjusting the heating power of the heating belt in the external temperature-controlled box and the heating elements in the external temperature-controlled aluminum trough, using the thermocouple measuring point on the external test cable as the target temperature. During the thermal vacuum test, the temperature of the external test cable can be controlled within the required range by properly adjusting the power of the infrared lamps, heating belts, and heating elements.

[0048] Amplitude and phase distribution tests were conducted on the thermal vacuum test payload of a multi-beam synthesized satellite. Figure 6 To ensure the temperature control of the extended bidirectional test assembly, a segmented infrared cage temperature measurement and control method was adopted to ensure that the temperature of each part of the extended bidirectional test assembly meets the requirement of 35℃±5℃. Figure 7 The image shows the temperature profile of the SF104P_TVAC cable inside the tank. A cable separator is used to tightly hold the cable against the inner wall of the precision temperature-controlled aluminum trough, and a cylindrical aluminum trough design is applied at the flange end. As can be seen from the image, this design ensures good temperature control of the cable inside the tank, meeting the temperature control requirements. This high-precision temperature control method is applied to amplitude and phase distribution testing. Analysis is performed on the amplitude and phase distribution test data of the thermal vacuum test of a multi-beam synthesized satellite payload. The test results of seven representative channels are shown below. Figure 8 , Figure 9 As shown, the test results meet the requirements for amplitude consistency (-0.12~0.16dB) and phase consistency (-1.74~2.72°), satisfying the technical specifications (amplitude consistency ≤ ±0.3dB, phase consistency ≤ ±6°). This result demonstrates the effectiveness of this high-precision temperature control method for amplitude and phase distribution testing. It can meet the requirements of multi-channel phase testing and can be widely used in thermal vacuum testing of various types of satellites, including mobile communication satellites, relay satellites, and SAR satellites, possessing high engineering value.

[0049] This invention solves the challenge of testing amplitude and phase distribution in thermal vacuum experiments for multi-beam synthesized satellites. By analyzing the amplitude and phase stability of the payload testing system for multi-beam synthesized satellites under thermal vacuum, a temperature control method for the amplitude and phase consistency testing system is proposed. Through several novel designs, accurate measurement of the core indicator of satellite transponder amplitude and phase consistency is achieved. The phase testing accuracy under thermal vacuum is better than 6°, and the testing efficiency is improved by more than 80%.

[0050] The embodiments described above are merely preferred embodiments of the present invention. Ordinary variations and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-precision temperature control method for amplitude and phase distribution testing, used to control the temperature of a beamforming satellite payload testing system, characterized in that, include: For the extended bidirectional test components, test couplers and cables connecting the two located in the hot vacuum chamber of the test system, a segmented infrared cage is used to control the temperature by irradiating from different directions through the infrared cage. For the test cables in the test system that connect the extended bidirectional test components and the flange inside the hot vacuum chamber, a precision temperature-controlled aluminum tank is used for precise temperature control. The precision temperature-controlled aluminum tank consists of a temperature-controlled tank body and a top plate, forming an internal enclosed space for cable radiative heat exchange. The precision temperature-controlled tank body is divided into an inner tank body and an outer tank body. Heating pads are attached to the outer surface of the outer tank body and wrapped with multiple layers of heat insulation material. Cable separators made of screws and nuts are installed on the inner tank body to separate and orderly place each cable and keep it close to the inner wall. For test cables located outside the hot vacuum tank in the test system, an external temperature control box is used to connect to an external temperature control aluminum tank for temperature control. Design a cylindrical aluminum trough with a single-layer structure. The inner surface is coated with black paint, and the outer surface is covered with heating elements and multiple layers of heat insulation components. The side of the precision temperature control aluminum trough closest to the flange extends into the interior of the cylindrical aluminum trough. The external temperature control box is designed with heating belts and infrared lamps for temperature control. The heating belts are attached to the bottom plate of the temperature control box, the cables are placed on the partition of the temperature control box, and an infrared lamp is installed at the cylindrical position opposite the flange of the hot vacuum container wall to ensure that the through-wall flange and the through-flange cable adapter are also within the required temperature range. The outer surface of the temperature control box is wrapped with heat-insulating rubber and plastic cotton for insulation. Adjust the infrared lamp power to heat the flange and the cable adapter through the flange, and control the temperature of the test cable outside the tank within the required range in the current area by adjusting the heating power of the heating belt of the external temperature control box.

2. The high-precision temperature control method for amplitude and phase distribution testing according to claim 1, characterized in that, The surface of the precision temperature-controlled aluminum tank is coated with a high-emissivity material to enhance radiative heat exchange between the inner and outer tanks and the cable; the cable surface is coated with a high-emissivity material to enhance radiative heat exchange.

3. The high-precision temperature control method for amplitude and phase distribution testing according to claim 1, characterized in that, The inner and outer tanks are fixed together by bolts, and polytetrafluoroethylene (PTFE) thermal insulation components are installed at the connection points to reduce heat conduction and ensure the temperature uniformity of the cable's radiative heat exchange environment.

4. The high-precision temperature control method for amplitude and phase distribution testing according to claim 1, characterized in that, For the test cable connecting the extended bidirectional test component and the flange inside the hot vacuum tank in the test system, precise temperature control is achieved by installing thermocouples as temperature measuring points on the test cable, the inner tank of the precise temperature-controlled aluminum tank, and the top plate. The temperature of the test cable measuring point is used as the target temperature, and the temperatures of the inner tank and the top plate of the precise temperature-controlled aluminum tank are used as auxiliary temperatures for control. During the test, the temperature of each measuring point is controlled within the required range by adjusting the heating power of the outer heating element.

5. A high-precision temperature control method for amplitude and phase distribution testing according to claim 1, characterized in that, Temperature monitoring points were attached to the area near the flange end of the test cable. These monitoring points were used as the target temperature. The heating power of the outer heating element of the cylindrical aluminum channel was adjusted to control the temperature of the test cable in the specified area within the required range.

6. A high-precision temperature control method for amplitude and phase distribution testing according to claim 1, characterized in that, The test coupler, the extended bidirectional test assembly, and the cable connecting them are encased in a steel outer frame. The steel outer frame is painted black on one side. Several infrared cages are fixed in the five directions of the steel outer frame: top, bottom, left, right, and front. Each infrared cage irradiates the area enclosed by the steel outer frame from different directions.

7. A high-precision temperature control method for amplitude and phase distribution testing according to claim 6, characterized in that, By adjusting the power of each infrared cage individually, the test coupler, cable, and extended bidirectional test assembly within the area can all be controlled within the required temperature range.

8. A high-precision temperature control method for amplitude and phase distribution testing according to claim 1, characterized in that, Heating pads are attached to the outer surface of the temperature-controlled aluminum trough outside the tank. After the cable is placed, it is wrapped with heat-insulating rubber and plastic cotton for insulation. The thermocouple temperature measuring point on the test cable outside the tank is used as the target temperature. By adjusting the heating power of the heating pads in the temperature-controlled aluminum trough outside the tank, the temperature of the test cable outside the tank in the current area is controlled within the required range.

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