Satellite-borne star sensor temperature control device and satellite

Abstract

The application provides a satellite-borne star sensor temperature control device and a satellite, which comprises a star sensor support (1), a star sensor (2) and a temperature control cover; the star sensor (2), a heater (3), a temperature measuring element (4) and a sprayed thermal control coating (5) are installed on the surface of a star sensor mounting surface of the star sensor support (1), and the remaining surface of the star sensor mounting surface is covered with a multilayer thermal insulation assembly (7); the temperature control cover covers the star sensor support (1) and the star sensor (2) and only exposes a star sensor light shield; the temperature control cover comprises a support frame (8) made of a metal rod piece, a heat dissipation plate (6) is installed on a partial area of the support frame (8), a partial area is covered with the multilayer thermal insulation assembly (7), the heater (3) and the temperature measuring element (4) are installed on the inner side of the heat dissipation plate (6), and the thermal control coating (5) is sprayed. The application solves the requirement of precise temperature control of the satellite-borne star sensor, has high temperature control precision, wide application range, small compensation power consumption, high reliability, simple structure and convenient installation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of precision temperature control, in particular, to a star sensor temperature control device and a satellite, and more particularly to a high-reliability star sensor precision temperature control device. BACKGROUND

[0002] The star sensor is a key device of the satellite attitude and orbit control system, and the temperature of the star sensor and the star sensor support is a key factor affecting the positioning accuracy. With the increasing resolution of optical loads, the thermal deformation of the star sensor support has a greater and greater impact on the attitude determination accuracy. For example, the star sensor mounting surface of a high-precision star sensor mounting support in a sun-synchronous orbit requires a temperature range of 20±3℃, an orbital fluctuation of less than ±0.3℃, and is installed on the outside of the satellite. The external heat flow changes dramatically, and reasonable temperature control measures need to be taken to ensure the working temperature of the star sensor and the support.

[0003] After searching the prior art, it is found that:

[0004] Patent document “Star sensor temperature control device” (application publication number CN104290924A) increases a light barrier on the star sensor support to block external heat flow, opens a heat dissipation port and increases the heat dissipation area to increase the heat dissipation capacity, so that the temperature of the head of the star sensor is maintained in the range of -20 to -10℃. The system is simple and reliable, but the temperature fluctuation is large, and the star sensor support is not temperature-controlled.

[0005] Patent document “High-precision temperature control device for star sensor of satellite” (application publication number CN103448925A) thermally connects the star sensor to the star sensor support, and connects the star sensor mounting support and an independent heat dissipation surface with a heat pipe. A heater is installed on the star sensor mounting surface of the star sensor support to control the temperature, which can meet the requirements of high-precision temperature control of the star sensor. Patent document “Star sensor temperature control system for satellite” (application publication number CN114408221A) thermally connects the star sensor head to the star sensor support, and thermally connects the star sensor head to the heat dissipation surface with a heat pipe. The length of the heat pipe is adjusted according to the heat consumption of the star sensor to change the heat dissipation surface, so that the temperature of the star sensor can be controlled in a suitable temperature range. The above two patents both use a heat pipe to connect the star sensor and the heat dissipation surface, but the installation, layout and the like of the heat pipe increase the design difficulty of the star sensor support. The installation of the heat pipe and the independent heat dissipation surface and the star sensor support, and the installation support of the heat pipe result in a complex interface with the satellite. The present application sprays a high-emissivity thermal control coating on the inner surface of the heat dissipation plate and the star sensor support mounting surface, and carries away the heat of the star sensor through radiation heat exchange without using a heat pipe, so that the structure is simple.

[0006] Patent document "A kind of star sensor for spacecraft One-piece general heat sink device" (application publication number CN108601298A), heat radiator is fixedly connected with the sunshade of star sensor, so that heat transport path (heat collecting plate, heat pipe, adapter plate, heat pipe, radiator) and heat dissipation component (heat radiator) are all located on the body of star sensor, which reduces the design difficulty of the whole star configuration layout and star sensor support, but the heat transfer path is transferred multiple times, the whole heat transfer and heat dissipation system is complex, the position of radiator is fixed relative to star sensor, and the adjustability is poor.The present application passes through the radiation heat exchange between the heat dissipation plate on the temperature control cover and the star sensor mounting surface of the star sensor support to take away the heat of the star sensor, the temperature control cover is not in contact with the star sensor support, the temperature control cover is installed outside the temperature control cover mounting surface, and the rest of the surface of the temperature control cover can be used as a heat dissipation surface, the size and position of the temperature control cover heat dissipation plate region can be flexibly set according to the external heat flow of the star sensor under different orbit conditions and different whole star layouts, and the application range is wide.

[0007] Patent document "Star sensor and thermal control device integrated installation support" (application publication number CN108910090A), the star sensor support can realize the integrated installation of the star sensor and its high-precision thermal control device, the star sensor thermal control device is completely independent of the satellite, the external interface is simple and reliable, and the installation adaptability is strong, but the device includes star sensor support, radiation plate, radiation plate support, heat pipe, sunshade curtain, sunshade curtain support rod and angle box, and the structure is complex. SUMMARY

[0008] In view of the defects in the prior art, the purpose of the present application is to provide a star-borne star sensor temperature control device and a satellite.

[0009] According to the star-borne star sensor temperature control device provided by the present application, the star sensor support 1, the star sensor 2 and the temperature control cover are included.

[0010] The surface of the star sensor mounting surface of the star sensor support 1 is provided with the star sensor 2, the heater 3, the temperature measuring element 4 and the thermal control coating 5, and the rest of the surface of the star sensor mounting surface is covered with the multilayer heat insulation assembly 7.

[0011] The temperature control cover covers the star sensor support 1 and the star sensor 2, and only exposes the star sensor sunshade; the temperature control cover includes a support frame 8 made of a metal rod, a heat dissipation plate 6 is installed on a part of the support frame 8, and a multilayer heat insulation assembly 7 is covered on a part of the support frame 8; the heater 3 and the temperature measuring element 4 are installed on the inner side of the heat dissipation plate 6, and the thermal control coating 5 is sprayed.

[0012] Preferably, the star sensor support 1 is an integrated aluminum-based silicon carbide support, and the star sensor support 1 has multiple surfaces as star sensor mounting surfaces; each star sensor mounting surface has multiple bosses 11, the star sensor 2 is installed on the bosses 11 in a heat-conducting manner, multiple temperature measuring elements 4 are installed in close contact with the bosses 11, multiple heaters 3 are pasted in the middle region of the multiple bosses 11, and the thermal control coating 5 is sprayed on the outer side region of the multiple bosses 11.

[0013] Preferably, the star sensor 2 is installed on the star sensor support 1 in a heat-conducting manner, heat is conducted to the star sensor support 1 through the boss 11 of the star sensor support 1, the heat is radiated to the heat dissipation plate 6 through the star sensor installation surface of the star sensor support 1, and finally radiated to the space.

[0014] Preferably, the emissivity of the thermal control coating 5 sprayed on the inner surface of the heat dissipation plate 6 and the star sensor installation surface of the star sensor support 1 is greater than or equal to 0.8, the star sensor installation surface of the star sensor support 1 faces the inner surface of the heat dissipation plate 6 of the temperature control cover, and the radiation heat exchange between the two is enhanced.

[0015] Preferably, the outermost layer of the multilayer thermal insulation assembly 7 on the star sensor support 1 is carburized polyimide film.

[0016] The heat dissipation plate 6 is made of aluminum plate, a plurality of temperature measuring elements and a plurality of heaters 3 are installed on the inner side of the heat dissipation plate 6, and a thermal control coating 5 is sprayed on the heat dissipation plate 6; the outer surface of the heat dissipation plate 6 is sprayed with thermal control white paint or pasted with OSR sheet; the multilayer thermal insulation assembly 7 on the heat dissipation plate 6 adopts carburized polyimide film as the innermost layer and silver-plated secondary surface mirror as the outermost layer.

[0017] Preferably, the temperature measuring element 4 measures the temperature of the star sensor support 1, compares the temperature with the target temperature, and controls the heater 3 to work; the multilayer thermal insulation assembly 7 blocks the influence of the space external heat flow on the star sensor support 1 and the star sensor 2.

[0018] Preferably, the heaters 3 are all programmed, and a control algorithm combining switch control and PI control is adopted; the temperature control algorithm sets a target temperature, an upper limit of temperature control and a lower limit of temperature control; when the temperature data collected by the temperature measuring element 4 is outside the range of the upper and lower limits of temperature control, the electric heater 3 adopts switch control; when the temperature data collected by the temperature measuring element 4 is within the range of the upper and lower limits of temperature control, the electric heater adopts PI control.

[0019] Preferably, the star sensor support 1 and the mounting plate are installed through the thermal insulation pad 10, the support frame 8 of the temperature control cover and the mounting plate are installed through the thermal insulation pad, the heat dissipation plate 6 and the support frame 8 of the temperature control cover are installed through the thermal insulation pad 10, and the star sensor light shield and the circuit box are thermally insulated; the thermal insulation pad is made of titanium alloy material and adopts a porous design structure.

[0020] Preferably, the temperature control cover is not in contact with the star sensor support 1; and no heat pipe is used.

[0021] According to the satellite provided by the application, the star sensor temperature control device is provided.

[0022] Compared with the prior art, the application has the following beneficial effects:

[0023] 1. The application controls the temperature of the heat dissipation plate 6 and the star sensor support 1 in two stages, adopts high-precision temperature measuring elements, and adopts a control algorithm combining switch control and PI control for the electric heater 3 on the star sensor support 1, so that the temperature control precision is high;

[0024] 2、Except the installation surface of the temperature control cover, the rest surface of the temperature control cover can be used as the heat dissipation surface, the size and position of the heat dissipation plate region of the temperature control cover can be flexibly set according to the external heat flow of the star sensor 2 under different orbit conditions and different satellite layouts, and the application range is wide.

[0025] 3、The star sensor support is made of integrated high-body aluminum-based silicon carbide material, has high heat conduction performance and low expansion performance, the temperature uniformity of the support is good, the temperature difference of the star sensor installation surface is small, meanwhile, the star sensor support is installed in thermal isolation with the installation plate, and the required compensation power consumption of the whole device is small.

[0026] 4、The thermal stability of the star sensor support is good, and the reliability of thermal deformation control is high; the thermal control products including the heater 3, the temperature measuring element 4, the thermal control coating 5 and the multi-layer thermal insulation assembly 7 are all common thermal control products, and have high reliability.

[0027] 5、The present application does not have a heat pipe and the like, only has a mechanical interface between the temperature control cover frame and the satellite, the mechanical structure is simple, and the mechanical interface is small; the star sensor shade is worn out from the multi-layer thermal insulation assembly of the temperature control cover, the temperature control cover and the star sensor are in soft connection, and installation is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0028] Other characteristics, objects and advantages of the present application will become more apparent from the following detailed description of non-restrictive embodiments, made with reference to the accompanying drawings:

[0029] Figure 1 It is a structural schematic view of a high-reliability on-board star sensor precision temperature control device.

[0030] Figure 2 It is a structural schematic view of a single star sensor installation surface thermal control product.

[0031] In the drawings, it is shown that:

[0032] DETAILED DESCRIPTION

[0033] The present application will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be pointed out that, for those skilled in the art, without departing from the concept of the present application, a number of changes and improvements can be made. These all belong to the protection scope of the present application.

[0034] In view of the defects in the prior art, the purpose of the present application is to provide an on-board star sensor temperature control device with high temperature control precision, wide application range, small compensation power consumption, high reliability, simple structure and convenient installation.

[0035] As Figure 1As shown, the high-reliability satellite-borne star sensor precision temperature control device provided in the embodiment of the application specifically comprises a star sensor support 1, a star sensor 2, a heater 3, a temperature measuring element 4, a thermal control coating 5, a heat dissipation plate 6, and a multilayer thermal insulation assembly 7. The star sensor 2 is installed on the star sensor mounting surface of the star sensor support 1, and the heater 3, the temperature measuring element 4, and the thermal control coating 5 are installed on the star sensor mounting surface, and the remaining surface is covered with the multilayer thermal insulation assembly 7.

[0036] The temperature control cover covers the star sensor support 1 and the star sensor 2, and comprises a support frame 8 made of a metal rod, a part of the support frame 8 is installed with the heat dissipation plate 6, and a part of the support frame 8 is covered with the multilayer thermal insulation assembly 7. The heater 3 and the temperature measuring element 4 are installed on the inner side of the heat dissipation plate 6, and the thermal control coating 5 is sprayed. The star sensor support 1 is installed with the mounting plate through the thermal insulation pad 10, the support frame of the temperature control cover is installed with the mounting plate through the thermal insulation pad, the heat dissipation plate is installed with the support frame of the temperature control cover through the thermal insulation pad 10, and the star sensor light shield cover is thermally insulated from the circuit box.

[0037] The star sensor support 1 is an integrated aluminum-based silicon carbide support, and the star sensor support 1 has multiple surfaces as star sensor mounting surfaces. Each star sensor mounting surface has four bosses 11, the star sensor is installed on the bosses 11 in a heat-conducting manner, two temperature measuring elements 4 are installed close to the bosses 11, two heaters 3 are pasted in the middle region of the four bosses 11, and the thermal control coating 5 is sprayed on the outer side region of the four bosses 11. The star sensor support 1 is covered with the multilayer thermal insulation assembly 7 except for the star sensor mounting surfaces, the multilayer thermal insulation assembly 7 adopts a low-temperature multilayer structure with 15 units, and the outermost layer of the multilayer thermal insulation assembly 7 on the star sensor support is a carburized polyimide film to prevent stray light.

[0038] The temperature control cover covers the star sensor support 1 and the star sensor 2, and only exposes the star sensor light shield; the temperature control cover is made of a metal rod piece to form a support frame, a heat dissipation plate is installed on a partial area of the support frame, and a multi-layer thermal insulation assembly 7 is wrapped on a partial area; the heat dissipation plate is made of a 3mm aluminum plate, two temperature measuring elements and two heating devices 3 are installed on the inner side of the heat dissipation plate, a thermal control coating is sprayed on the heat dissipation plate, and a thermal control white paint or an OSR sheet is pasted on the outer surface of the heat dissipation plate; the multi-layer thermal insulation assembly adopts a low-temperature multi-layer structure with 15 units, the innermost layer is a carburized polyimide film, and the outermost layer is a F46 silver-plated secondary surface mirror. The two heating devices 3 in each temperature control area are designed with a main backup, specifically, under normal circumstances, the main heating device works to control the temperature, when the main heating device fails or the heating capacity is insufficient, the backup heating device works to ensure that it still has corresponding heating capacity. The heating device 3 is designed with minimized power, which is beneficial to improve the temperature control precision. The temperature measuring element 4 is a high-precision platinum resistor Pt100, and the heating device is a polyimide film type electric heater; the heating device is programmed, and a control algorithm combining switch control and PI control is adopted. In the temperature control algorithm, a temperature control target, an upper limit of temperature control and a lower limit of temperature control are set, when the temperature data collected by the high-precision temperature measuring element is out of the range of the upper and lower limits of temperature control, the electric heater adopts switch control; when the temperature data collected by the high-precision temperature measuring element is within the range of the upper and lower limits of temperature control, the electric heater adopts PI control.

[0039] The emissivity of the thermal control coating sprayed on the inner surface of the heat dissipation plate and the star sensor mounting surface of the star sensor support 1 is greater than or equal to 0.8, the star sensor mounting surface of the star sensor support 1 faces the inner surface of the heat dissipation plate of the temperature control cover, and the radiation heat exchange between the two is strengthened.

[0040] The star sensor support 1 and the mounting plate are installed through a thermal insulation pad, the support frame of the temperature control cover and the mounting plate are installed through a thermal insulation pad, the heat dissipation plate and the support frame of the temperature control cover are installed through a thermal insulation pad, and the thermal insulation pad is made of titanium alloy and adopts a porous design structure.

[0041] The working principle of the present application is that the star sensor 2 has heat consumption and needs to dissipate heat; the star sensor 2 is installed on the star sensor support 1, and the specific installation position is on the boss 11 on the star sensor support 1; the star sensor support 1 is temperature controlled.

[0042] The specific temperature control working principle is as follows: the star sensor 2 is installed on the star sensor support 1 in a heat-conducting manner, heat is conducted to the star sensor support 1 through the boss 11 of the star sensor support 1, the heat is radiated to the heat dissipation plate 6 through the star sensor mounting surface of the star sensor support 1, and finally radiated to space. Among them, the thermal control coating 5 strengthens the radiation heat exchange between the heat dissipation plate 6 and the star sensor support 1. The temperature measuring element 4 measures the temperature of the star sensor support 1, compares it with the temperature control target temperature, and controls the working of the heating device 3. The multi-layer thermal insulation assembly 7 is used to block the influence of the space external heat flow on the star sensor support 1 and the star sensor 2. The support frame 8 is used to fix the heat dissipation plate 6 and the multi-layer thermal insulation assembly 7. The thermal insulation pad 10 can reduce the influence of the mounting plate 9 on the temperature of the star sensor support 1.

[0043] In the description of the present application, it needs to be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0044] The specific embodiments of the present application are described above. It needs to be understood that the present application is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essential content of the present application. The embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other without conflict.

Claims

1. A temperature control device for a space-borne star sensor, characterized in that, The application relates to a star sensor temperature control device. The star sensor (2), the heater (3), the temperature measuring element (4) and the thermal control coating (5) are installed on the surface of the star sensor installation surface of the star sensor support (1), and the remaining surface of the star sensor installation surface is covered by the multilayer thermal insulation assembly (7). The temperature control cover covers the star sensor support (1) and the star sensor (2) and exposes only the star sensor light shield; the temperature control cover comprises a support frame (8) made of a metal rod piece, a heat dissipation plate (6) is installed on the upper part of the support frame (8), and the support frame (8) is covered by the multilayer thermal insulation assembly (7); the heater (3) and the temperature measuring element (4) are installed on the inner side of the heat dissipation plate (6), and the thermal control coating (5) is sprayed on the heat dissipation plate (6). The heater (3) is programmed and adopts a control algorithm combining switch control and PI control; the temperature control algorithm is provided with a temperature control target, an upper temperature control limit and a lower temperature control limit; when the temperature data collected by the temperature measuring element (4) is out of the range of the upper and lower temperature control limits, the electric heater (3) adopts switch control; when the temperature data collected by the temperature measuring element (4) is within the range of the upper and lower temperature control limits, the electric heater adopts PI control. The heat dissipation plate (6) and the star sensor support (1) are controlled in two stages by using the temperature measuring element. The star sensor support (1) is an integrated aluminum-based silicon carbide support, and the star sensor support (1) has multiple surfaces as star sensor installation surfaces; multiple bosses (11) are arranged on each star sensor installation surface; the star sensor (2) is heat-conducting installed on the bosses (11); multiple temperature measuring elements (4) are tightly installed on the bosses (11); multiple heaters (3) are pasted in the middle region of the multiple bosses (11); and the thermal control coating (5) is sprayed on the outer side region of the multiple bosses (11). The star sensor (2) is heat-conducting installed on the star sensor support (1); heat is conducted to the star sensor support (1) through the bosses (11) of the star sensor support (1); the heat is radiated to the heat dissipation plate (6) through the star sensor installation surface of the star sensor support (1); and finally the heat is radiated to the space.

2. The temperature control device for a space-borne star sensor according to claim 1, wherein, The emissivity of the thermal control coating (5) sprayed on the inner surface of the heat dissipation plate (6) and the star sensor installation surface of the star sensor support (1) is greater than or equal to 0.8; the star sensor installation surface of the star sensor support (1) faces the inner surface of the heat dissipation plate (6) of the temperature control cover, so that the radiation heat exchange between the two is strengthened.

3. The temperature control device for a space-borne star sensor according to claim 2, characterized in that, The outermost layer of the multilayer thermal insulation assembly (7) on the star sensor support (1) is carburized polyimide film.

4. The temperature control device for a space-borne star sensor according to claim 3, characterized in that, The heat dissipation plate (6) is made of an aluminum plate, multiple temperature measuring elements and multiple heaters (3) are installed on the inner side of the heat dissipation plate (6), and the thermal control coating (5) is sprayed on the heat dissipation plate (6); the outer surface of the heat dissipation plate (6) is sprayed with thermal control white paint or pasted with OSR sheets; the multilayer thermal insulation assembly (7) on the heat dissipation plate (6) adopts carburized polyimide film as the innermost layer and silver-plated secondary surface mirror as the outermost layer. The temperature measuring element (4) measures the temperature of the star sensor support (1) and compares the temperature with the target temperature to control the working of the heater (3); the multilayer thermal insulation assembly (7) blocks the influence of the space external heat flow on the star sensor support (1) and the star sensor (2).

5. The temperature control device for a space-borne star sensor according to claim 2, wherein ​ 6. The temperature control device for a space-borne star sensor according to claim 1, wherein The star sensor support (1) is installed with the mounting plate through a thermal insulation pad (10), the support frame (8) of the temperature control cover is installed with the mounting plate through a thermal insulation pad, the heat dissipation plate (6) is installed with the support frame (8) of the temperature control cover through a thermal insulation pad (10), and the star sensor light shield cover and the circuit box are thermally insulated; the thermal insulation pad is made of titanium alloy material and adopts a porous design structure.

7. The temperature control device for a space-borne star sensor according to claim 1, wherein The temperature control cover is in contact with the star sensor support (1); and a heat pipe is not used.

8. A satellite, characterized by The star sensor temperature control device is used for a satellite-borne star sensor.

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