High-precision fast on-satellite black body calibration control system and method

Abstract

The invention relates to a high-precision rapid on-satellite black body calibration control system and method, and the system comprises a management control unit, a temperature control unit, a black body control unit and an optical machine main body, and an on-satellite black body is installed on the optical machine main body. The on-satellite black body comprises a high-temperature black body and a low-temperature black body, and the high-temperature black body and the low-temperature black body are respectively provided with two groups of same heating resistors which are respectively used as driving elements of the temperature control unit and the black body control unit; a group of thermistors and a group of platinum resistors are used for on-satellite blackbody temperature measurement and are respectively used as feedback elements of the temperature control unit and the blackbody control unit; the management control unit is electrified for a long time to work and is used for process management and work scheduling of the whole control system; the temperature control unit is powered up for working for a long time and is used for controlling the temperature of the optical machine main body and providing initial temperature for the on-satellite black body; the black body control unit only works in a short-term power-up mode in an imaging mode and is used for high-precision temperature control of the on-satellite black body. According to the invention, high-precision and rapid control of the on-satellite calibration black body can be realized.

Description

Technical Field

[0001] The invention relates to a high-precision and fast on-board blackbody calibration control system and method, belonging to the technical field of aerospace optical remote sensing. Background Art

[0002] Radiation calibration is a necessary means of quantitative detection, which directly affects the accuracy and practicality of the data obtained after the payload is delivered. Due to the fluctuation of the infrared detector itself, the infrared camera needs to be calibrated on the satellite for each imaging. High-precision on-board blackbody temperature control technology is a commonly used method for on-board radiation calibration.

[0003] In the past, on-board radiation calibration technology focused on the design of the on-board blackbody itself and the research on the calibration algorithm, but did not consider the impact of the on-orbit working mode of the payload on the blackbody control. There was a lack of optimization of the blackbody control method for infrared remote sensors working in orbit for a short period of time, and there were problems such as the blackbody taking too long to reach temperature and the long working time of the control circuit.

[0004] In order to solve the above problems, combined with the satellite on-orbit working mode, it is necessary to design a high-precision and fast on-board blackbody control system and control method. Summary of the invention

[0005] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art and to provide an on-board blackbody control system and method for an infrared remote sensor that can be used for short-term on-orbit operation, which can achieve high-precision and fast control of the on-board calibration blackbody.

[0006] The technical solution of the present invention is:

[0007] A high-precision and fast on-board blackbody calibration control system, comprising: a management control unit, a temperature control unit, a blackbody control unit and an optical machine body, wherein the on-board blackbody is installed on the optical machine body;

[0008] The on-board blackbody includes a high-temperature blackbody and a low-temperature blackbody. Both the high-temperature blackbody and the low-temperature blackbody are provided with two sets of identical heating resistors, which serve as driving elements of the temperature control unit and the blackbody control unit respectively. The on-board blackbody temperature measurement uses a set of thermistors and a set of platinum resistors, which serve as feedback elements of the temperature control unit and the blackbody control unit respectively.

[0009] The management control unit is powered on for a long time and is used for the entire control system process management and work scheduling; the temperature control unit is powered on for a long time and is used for the temperature control of the optical machine body and to provide the initial temperature for the blackbody on the satellite; the blackbody control unit is only powered on for a short time in the imaging mode and is used for high-precision temperature control of the blackbody on the satellite.

[0010] Furthermore, in the standby mode, the temperature control unit is used to roughly control the temperature of the black body on the satellite and maintain the initial working temperature. In the imaging mode, the black body control unit is switched to finely control the temperature of the black body on the satellite, and the target temperature of the fine temperature control is quickly reached based on the initial working temperature.

[0011] Furthermore, the parameters of the on-board blackbody control include: the initial temperature of the on-board blackbody T ck 、High-precision temperature control of the black body on the star T jk , high-precision temperature control to temperature time T lg .

[0012] Furthermore, the target temperature of the rough temperature control of the black body on the satellite is lower than the high-precision temperature control temperature of the black body T jk , the target temperature is the initial temperature of the black body on the star T ck ;

[0013] D T =T jk -T ck

[0014] D T For the temperature difference.

[0015] Furthermore,

[0016] The method for confirming the parameters of the on-board blackbody is as follows: the initial temperature T of the on-board blackbody is determined by thermal vacuum test of the ground subsystem. ck , blackbody high precision temperature control temperature T jk , temperature difference D T And high-precision temperature control to temperature time T lg .

[0017] General temperature difference D T The smaller the temperature-to-temperature time T lg The smaller the temperature difference, the more unstable the control system will be. After testing and on-orbit verification, the system takes the temperature difference D T is 0.5℃, and the temperature reaching time T is obtained lg If it is found that the default parameters are not suitable, the new parameters can be readjusted using the on-orbit data and re-injected through the satellite measurement and control channel.

[0018] Furthermore, the working process of the on-board blackbody calibration control system is as follows:

[0019] The on-board blackbody calibration control system is in "standby mode" to ensure the initial temperature of the on-board blackbody;

[0020] The management control unit receives the satellite "imaging mode" command and starts the high-precision blackbody temperature control process;

[0021] The management control unit powers on the black body control unit;

[0022] The blackbody control unit determines whether there is the latest injection parameter. If yes, the blackbody on the satellite is controlled according to the latest injection parameter, otherwise it is controlled according to the default parameter; the parameters include: high-precision temperature control temperature T of the blackbody on the satellite jk 、High-precision temperature control of the black body on the star to the temperature time T lg ;

[0023] The management control unit notifies the temperature control unit to stop blackbody temperature control;

[0024] After the management control unit receives the "standby mode" command, it starts the blackbody initial temperature control process;

[0025] The management control unit notifies the temperature control unit to start blackbody temperature control, and the control parameter is the blackbody initial temperature T ck , to ensure the initial temperature of the black body on the star;

[0026] The management control unit notifies the black body control unit to stop black body temperature control;

[0027] The management control unit powers off the black body control unit.

[0028] In a second aspect, the present invention further proposes a blackbody calibration control method on a satellite, comprising the following steps:

[0029] (1) The onboard blackbody calibration control system is in "standby mode" to ensure the initial temperature of the onboard blackbody;

[0030] (2) The management control unit receives the satellite "imaging mode" command and starts the high-precision blackbody temperature control process;

[0031] (3) The management control unit powers on the black body control unit;

[0032] (4) The blackbody control unit determines whether there is the latest injection parameter. If yes, the on-board blackbody is controlled according to the latest injection parameter. Otherwise, it is controlled according to the default parameter. The parameters include: the high-precision temperature control temperature T of the on-board blackbody jk 、High-precision temperature control of the black body on the star to the temperature time T lg ;

[0033] (5) The management control unit notifies the temperature control unit to stop blackbody temperature control;

[0034] (6) After the management control unit receives the "standby mode" command, it starts the bold temperature control process;

[0035] (7) The management control unit notifies the temperature control unit to start blackbody temperature control. The control parameters include the initial blackbody temperature T ck , to ensure the initial temperature of the black body on the star;

[0036] (8) The management control unit notifies the blackbody control unit to stop blackbody temperature control;

[0037] (9) The management control unit powers off the black body control unit.

[0038] Furthermore, the target temperature of the rough temperature control of the black body on the satellite is lower than the high-precision temperature control temperature of the black body T jk , the target temperature is the initial temperature of the black body on the star T ck ;

[0039] D T =T jk -T ck

[0040] D T For the temperature difference.

[0041] Furthermore, in the standby mode, the temperature control unit that is powered on for a long time performs rough temperature control on the black body with a temperature control accuracy of ±200mK.

[0042] Furthermore, in the imaging mode, the temperature control accuracy of the blackbody control unit is better than ±20mK, and the temperature difference D T The time T for high-precision temperature control of the black body on the star is 0.5℃. lg Less than 10 minutes.

[0043] The beneficial effects of the present invention compared with the prior art are:

[0044] (1) The control system device of the present invention has high integration and good compatibility, and is easy to match with the satellite platform;

[0045] (2) The control method of the present invention takes into account both high precision and speed, which can greatly shorten the working time of the control circuit and improve the system reliability;

[0046] (3) The control method of the present invention can be used as a basic control method for blackbody control onboard an infrared camera for short-term imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the composition principle of the control system of the present invention;

[0048] Figure 2 It is a control flow chart of the present invention. DETAILED DESCRIPTION

[0049] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0050] The present invention proposes an on-board blackbody control system for infrared remote sensors that can be used for short-term on-orbit operation, which can realize high-precision and fast control of on-board calibration blackbody. In standby mode, a long-powered temperature control unit is used to roughly control the temperature of the blackbody (temperature control accuracy ±200mK) and maintain the initial working temperature; in imaging mode, a blackbody control unit is used to precisely control the temperature of the blackbody (temperature control accuracy is better than ±20mK), which can greatly shorten the blackbody temperature-reaching time (less than 10 minutes) and shorten the working time of the blackbody control circuit (working in imaging mode and power-off in standby mode), thereby improving the reliability of the system.

[0051] like Figure 1 As shown, the present invention proposes a high-precision and high-reliability control system for a black body on a satellite, comprising: a management control unit, a temperature control unit, a black body control unit and an optical machine body, wherein a high-temperature black body and a low-temperature black body are installed on the optical machine body;

[0052] Each blackbody on the satellite is equipped with two sets of identical heating resistors, which serve as driving elements of the temperature control unit and the blackbody control unit respectively; the temperature measurement of the blackbody on the satellite uses a set of thermistors and a set of platinum resistors, which serve as feedback elements of the temperature control unit and the blackbody control unit respectively.

[0053] The management control unit is powered on for a long time and is responsible for the process management and work scheduling of the entire control system; the temperature control unit is powered on for a long time and is responsible for the temperature control of the optical machine body and provides the initial temperature for the calibration blackbody; the blackbody control unit is powered on for a short time only in the imaging mode and is responsible for the high-precision temperature control of the blackbody on the satellite;

[0054] In standby mode, the temperature control unit is used to roughly control the temperature of the black body on the satellite and maintain the initial working temperature. In imaging mode, the black body control unit is switched to finely control the temperature of the black body on the satellite, and the target temperature of fine temperature control is quickly reached based on the initial working temperature.

[0055] The parameters of the on-board blackbody control include: the initial temperature of the on-board blackbody T ck 、High-precision temperature control of the black body on the star T jk 、High-precision temperature control of the black body on the star to the temperature time T lg .

[0056] Set the blackbody rough temperature control target temperature (initial temperature) lower than the blackbody high-precision temperature control temperature.

[0057] D T =T jk -T ck

[0058] D T For the temperature difference.

[0059] Method for confirming the parameters of the on-board blackbody: Determine the initial temperature T of the on-board blackbody through the ground subsystem thermal vacuum test ck , blackbody high precision temperature control temperature T jk , temperature difference D T And the temperature control time T lg .

[0060] General temperature difference D T The smaller the temperature-to-temperature time T lg The smaller the temperature difference, the more unstable the control system will be. After testing and on-orbit verification, the system takes the temperature difference D T is 0.5℃, and the temperature reaching time T is obtained lg If the default parameters are found to be inappropriate, the new parameters can be recalculated using the on-orbit data and re-injected through the satellite measurement and control channel.

[0061] The present invention also proposes a high-precision and high-reliability control method for a black body on a satellite. Figure 2 As shown, including:

[0062] (1) The onboard blackbody calibration control system is in "standby mode" to ensure the initial temperature of the onboard blackbody;

[0063] (2) The management control unit receives the satellite "imaging mode" command and starts the high-precision blackbody temperature control process;

[0064] (3) The management control unit powers on the black body control unit;

[0065] (4) The blackbody control unit determines whether there is the latest injection parameter. If yes, the on-board blackbody is controlled according to the latest injection parameter. Otherwise, it is controlled according to the default parameter. The parameters include: the high-precision temperature control temperature T of the on-board blackbody jk 、High-precision temperature control of the black body on the star to the temperature time T lg ;

[0066] (5) The management control unit notifies the temperature control unit to stop blackbody temperature control;

[0067] (6) After the management control unit receives the "standby mode" command, it starts the bold temperature control process;

[0068] (7) The management control unit notifies the temperature control unit to start blackbody temperature control. The control parameters include the initial blackbody temperature T ck , to ensure the initial temperature of the black body on the star;

[0069] The target temperature of the blackbody rough temperature control on the star is lower than the blackbody high-precision temperature control temperature T jk , the target temperature is the initial temperature of the black body on the star T ck ;

[0070] DT =T jk -T ck

[0071] D T For the temperature difference.

[0072] (8) The management control unit notifies the blackbody control unit to stop blackbody temperature control;

[0073] (9) The management control unit powers off the black body control unit.

[0074] In standby mode, the temperature control unit with long power supply performs rough temperature control on the black body with a temperature control accuracy of ±200mK. In imaging mode, the black body control unit performs fine temperature control on the black body with a temperature control accuracy better than ±20mK. T The time T for high-precision temperature control of the black body on the star is 0.5℃. lg Less than 10 minutes. The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A high-precision and fast on-board blackbody calibration control system, characterized in that include: A management control unit, a temperature control unit, a black body control unit and an optical machine body, wherein the onboard black body is installed on the optical machine body; The on-board blackbody includes a high-temperature blackbody and a low-temperature blackbody. Both the high-temperature blackbody and the low-temperature blackbody are provided with two sets of identical heating resistors, which serve as driving elements of the temperature control unit and the blackbody control unit respectively. The on-board blackbody temperature measurement uses a set of thermistors and a set of platinum resistors, which serve as feedback elements of the temperature control unit and the blackbody control unit respectively. The management control unit is powered on for a long time and is used for the entire control system process management and work scheduling; the temperature control unit is powered on for a long time and is used for the temperature control of the optical machine body and to provide the initial temperature for the blackbody on the satellite; the blackbody control unit is only powered on for a short time in the imaging mode and is used for high-precision temperature control of the blackbody on the satellite.

2. A high-precision and fast on-board blackbody calibration control system according to claim 1, characterized in that: In standby mode, the temperature control unit is used to roughly control the temperature of the black body on the satellite and maintain the initial working temperature. In imaging mode, the black body control unit is switched to finely control the temperature of the black body on the satellite, and the target temperature of fine temperature control is quickly reached based on the initial working temperature.

3. A high-precision and fast on-board blackbody calibration control system according to claim 2, characterized in that: The parameters of the on-board blackbody control include: the initial temperature of the on-board blackbody T ck 、High-precision temperature control of the black body on the star T jk , high-precision temperature control to temperature time T lg .

4. The high-precision and fast on-board blackbody calibration control system according to claim 3 is characterized in that: The target temperature of the blackbody rough temperature control on the star is lower than the blackbody high-precision temperature control temperature T jk , the target temperature is the initial temperature of the black body on the star T ck ; D T =T jk -T ck D T For the temperature difference.

5. The high-precision and fast on-board blackbody calibration control system according to claim 3 is characterized in that: The method for confirming the parameters of the on-board blackbody is as follows: the initial temperature T of the on-board blackbody is determined by thermal vacuum test of the ground subsystem. ck , blackbody high precision temperature control temperature T jk , temperature difference D T And high-precision temperature control to temperature time T lg .

6. The high-precision and fast on-board blackbody calibration control system according to claim 3 is characterized in that: The working process of the on-board blackbody calibration control system is as follows: The on-board blackbody calibration control system is in "standby mode" to ensure the initial temperature of the on-board blackbody; The management control unit receives the satellite "imaging mode" command and starts the high-precision blackbody temperature control process; The management control unit powers on the black body control unit; The blackbody control unit determines whether there is the latest injection parameter. If yes, the blackbody on the satellite is controlled according to the latest injection parameter, otherwise it is controlled according to the default parameter; the parameters include: high-precision temperature control temperature T of the blackbody on the satellite jk 、High-precision temperature control of the black body on the star to the temperature time T lg ; The management control unit notifies the temperature control unit to stop blackbody temperature control; After the management control unit receives the "standby mode" command, it starts the blackbody initial temperature control process; The management control unit notifies the temperature control unit to start blackbody temperature control, and the control parameter is the blackbody initial temperature T ck , to ensure the initial temperature of the black body on the star; The management control unit notifies the black body control unit to stop black body temperature control; The management control unit powers off the black body control unit.

7. A method for controlling a blackbody calibration on a satellite implemented by the high-precision and fast blackbody calibration control system on a satellite according to claim 1, characterized in that include: (1) The onboard blackbody calibration control system is in "standby mode" to ensure the initial temperature of the onboard blackbody; (2) The management control unit receives the satellite "imaging mode" command and starts the high-precision blackbody temperature control process; (3) The management control unit powers on the black body control unit; (4) The blackbody control unit determines whether there is the latest injection parameter. If yes, the on-board blackbody is controlled according to the latest injection parameter. Otherwise, it is controlled according to the default parameter. The parameters include: the high-precision temperature control temperature T of the on-board blackbody jk 、High-precision temperature control of the black body on the star to the temperature time T lg ; (5) The management control unit notifies the temperature control unit to stop blackbody temperature control; (6) After the management control unit receives the "standby mode" command, it starts the bold temperature control process; (7) The management control unit notifies the temperature control unit to start blackbody temperature control. The control parameters include the initial blackbody temperature T ck , to ensure the initial temperature of the black body on the star; (8) The management control unit notifies the blackbody control unit to stop blackbody temperature control; (9) The management control unit powers off the black body control unit.

8. The on-board blackbody calibration control method according to claim 7, characterized in that: The target temperature of the blackbody rough temperature control on the star is lower than the blackbody high-precision temperature control temperature T jk , the target temperature is the initial temperature of the black body on the star T ck ; D T =T jk -T ck D T For the temperature difference.

9. The on-board blackbody calibration control method according to claim 7, characterized in that: In standby mode, the long-powered temperature control unit performs rough temperature control on the blackbody with a temperature control accuracy of ±200mK.

10. The on-board blackbody calibration control method according to claim 8, characterized in that: In imaging mode, the blackbody control unit can precisely control the temperature of the blackbody with an accuracy better than ±20mK, and the temperature difference D T The black body on the star has a high-precision temperature control time of 0.5℃. lg Less than 10 minutes.

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