A high-precision and rapid on-board blackbody calibration control system and method

Abstract

A high-precision and fast on-board blackbody calibration control system and method, comprising: a management control unit, a temperature control unit, a blackbody control unit and an optical machine main body, the on-board blackbody is installed on the optical machine main body; the on-board blackbody comprises a high-temperature blackbody and a low-temperature blackbody, both the high-temperature blackbody and the low-temperature blackbody are provided with two groups of identical heating resistors, which are respectively used as driving elements of the temperature control unit and the blackbody control unit; a group of thermistors and a group of platinum resistors are used for on-board blackbody temperature measurement, which are respectively used as feedback elements of the temperature control unit and the blackbody control unit; the management control unit is long-term powered on for work, and is used for whole control system process management and work scheduling; the temperature control unit is long-term powered on for work, and is used for temperature control of the optical machine main body and provides an initial temperature for the on-board blackbody; the blackbody control unit is short-term powered on for work only in the imaging mode, and is used for high-precision temperature control of the on-board blackbody. The on-board calibration blackbody high-precision and fast control can be realized.

Description

Technical Field

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

[0002] Radiometric calibration is an essential method for quantitative detection, directly impacting the accuracy and usability of data acquired after payload delivery. Due to inherent fluctuations in infrared detectors, on-board radiometric calibration is required for each infrared camera image. High-precision on-board blackbody temperature control technology is a commonly used method for on-board radiometric calibration.

[0003] Previous on-board radiation calibration technology focused on the design of the on-board blackbody itself and the research of calibration algorithms, without considering the impact of the payload's on-orbit operating mode on blackbody control. It also lacked optimization of the blackbody control method for infrared remote sensors operating for short periods on orbit, resulting in problems such as excessively long blackbody temperature rise time and long control circuit operating time.

[0004] To address the aforementioned issues, and considering the satellite's on-orbit operating mode, a high-precision and fast on-board blackbody control system and method need to be designed. Summary of the Invention

[0005] The technical problem solved by the present invention is to overcome the shortcomings of the prior art and to provide a 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 blackbody for on-board calibration.

[0006] The technical solution of this invention is:

[0007] A high-precision and fast on-board blackbody calibration control system includes: a management control unit, a temperature control unit, a blackbody control unit, and an optomechanical main body, with the on-board blackbody mounted on the optomechanical main 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 equipped with two sets of identical heating resistors, which serve as driving elements for 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 resistance thermometers, which serve as feedback elements for the temperature control unit and the blackbody control unit, respectively.

[0009] The management and control unit is powered on continuously for process management and work scheduling of the entire control system; the temperature control unit is powered on continuously for temperature control of the main optical engine and to provide the initial temperature for the blackbody on the satellite; the blackbody control unit is powered on only briefly in imaging mode for high-precision temperature control of the blackbody on the satellite.

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

[0011] Furthermore, the parameters controlled by the on-board blackbody include: the initial temperature T of the on-board blackbody. ck High-precision temperature control of the blackbody on the satellite (T) jk High-precision temperature control with a settling time T lg .

[0012] Furthermore, the target temperature for coarse temperature control of the onboard blackbody is lower than the high-precision temperature T of the blackbody. jk The target temperature is the initial temperature T of the blackbody on the satellite. ck ;

[0013] D T =T jk -T ck

[0014] D T This refers to the temperature difference.

[0015] Furthermore,

[0016] The method for confirming the parameters of the onboard blackbody is as follows: the initial temperature T of the onboard blackbody is determined through thermal vacuum tests of the ground subsystem. ck High-precision temperature control of blackbody (T) jk Temperature difference D T And high-precision temperature control to temperature time T lg .

[0017] Typical temperature difference D T The smaller the time T to reach temperature lg The smaller the temperature difference, the less stable the control system becomes, but an excessively small temperature difference can lead to instability. Through testing and on-orbit verification, this system uses a temperature difference D. T The temperature was 0.5℃, and the time T to reach the desired temperature was obtained. lg Less than 10 minutes. If the default on-orbit parameter settings are found to be inappropriate, new parameters can be readjusted using on-orbit data and then re-uploaded via the satellite telemetry and control channel.

[0018] Furthermore, the specific 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 and control unit receives the satellite's "imaging mode" command and begins the high-precision blackbody temperature control process;

[0021] The management control unit powers on the blackbody control unit;

[0022] The blackbody control unit checks for updated injection parameters. If so, it controls the on-board blackbody according to the updated parameters; otherwise, it controls it according to the default parameters. These parameters include: the on-board blackbody's high-precision temperature control temperature T. jk High-precision temperature control of onboard blackbody to temperature time T lg ;

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

[0024] After receiving the "standby mode" command, the management and control unit begins the blackbody initial temperature control process;

[0025] The management control unit notifies the temperature control unit to begin blackbody temperature control, with the control parameter being the initial blackbody temperature T. ck To ensure the initial temperature of the blackbody on the satellite;

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

[0027] The management control unit is powered down by the blackbody control unit.

[0028] Secondly, this invention also proposes an on-board blackbody calibration control method, comprising the following steps:

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

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

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

[0032] (4) The blackbody control unit determines whether there are new injection parameters. If so, it controls the on-board blackbody according to the new injection parameters; otherwise, it controls it according to the default parameters. The parameters include: the high-precision temperature control temperature T of the on-board blackbody. jk High-precision temperature control of onboard blackbody to temperature time T lg ;

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

[0034] (6) After receiving the “standby mode” command, the management and control unit starts the blackbody coarse 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 blackbody on the satellite;

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

[0037] (9) The management control unit is powered down by the blackbody control unit.

[0038] Furthermore, the target temperature for coarse temperature control of the onboard blackbody is lower than the high-precision temperature T of the blackbody. jk The target temperature is the initial temperature T of the blackbody on the satellite. ck ;

[0039] D T =T jk -T ck

[0040] D T This refers to the temperature difference.

[0041] Furthermore, in standby mode, the temperature control unit, which is constantly powered on, provides coarse temperature control of the blackbody with a temperature accuracy of ±200mK.

[0042] Furthermore, in imaging mode, the blackbody control unit achieves a temperature control accuracy of better than ±20mK for precise blackbody temperature control, with a temperature difference D... T The temperature rise time T for high-precision temperature control of the on-board blackbody is 0.5℃. lg Less than 10 minutes.

[0043] The advantages of this invention compared to the prior art are:

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

[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 reliability of the system;

[0046] (3) The control method of the present invention can be used as a basic control method for the on-board blackbody control of infrared cameras for short-term imaging. Attached Figure Description

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

[0048] Figure 2 This is the control flowchart of the present invention. Detailed Implementation

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

[0050] This invention proposes an on-board blackbody control system for infrared remote sensors that can be used for short-term on-orbit operation, enabling high-precision and rapid control of the on-board calibrated blackbody. In standby mode, a continuously powered temperature control unit is used to perform coarse temperature control of the blackbody (temperature control accuracy ±200mK) and maintain the initial operating temperature. In imaging mode, the blackbody control unit is used to perform fine temperature control of the blackbody (temperature control accuracy better than ±20mK). This significantly shortens the time for the blackbody to reach operating temperature (less than 10 minutes) and also reduces the operating time of the blackbody control circuit (operating in imaging mode and powered off in standby mode), thus improving system reliability.

[0051] like Figure 1 As shown, the present invention proposes a high-precision and high-reliability control system for an on-board blackbody, comprising: a management control unit, a temperature control unit, a blackbody control unit, and an optomechanical body, wherein a high-temperature blackbody and a low-temperature blackbody are mounted on the optomechanical body;

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

[0053] The management and control unit operates continuously, responsible for the overall control system process management and work scheduling; the temperature control unit operates continuously, responsible for the temperature control of the main optical engine and providing the initial temperature for the calibration blackbody; the blackbody control unit operates only briefly in imaging mode, responsible for the high-precision temperature control of the on-board blackbody.

[0054] In standby mode, the temperature control unit is used to coarsely control the temperature of the blackbody on the satellite and maintain the initial operating temperature. In imaging mode, the blackbody control unit is switched to finely control the temperature of the blackbody on the satellite, and the target temperature of fine temperature control is quickly reached on the basis of the initial operating temperature.

[0055] The parameters controlled by the on-board blackbody include: the initial temperature T of the on-board blackbody. ck High-precision temperature control of the blackbody on the satellite (T) jk High-precision temperature control of onboard blackbody to temperature time T lg .

[0056] Set the target temperature (initial temperature) for coarse blackbody temperature control to be lower than the high-precision blackbody temperature control temperature.

[0057] D T =T jk -T ck

[0058] D T This refers to the temperature difference.

[0059] Method for confirming onboard blackbody parameters: The initial temperature T of the onboard blackbody was determined through thermal vacuum tests of the ground subsystem. ck High-precision temperature control of blackbody (T) jk Temperature difference D T and the temperature control time T lg .

[0060] Typical temperature difference D T The smaller the time T to reach temperature lg The smaller the temperature difference, the less stable the control system becomes, but an excessively small temperature difference can lead to instability. Through testing and on-orbit verification, this system uses a temperature difference D. T The temperature was 0.5℃, and the time T to reach the desired temperature was obtained. lg Less than 10 minutes. If the default on-orbit parameter settings are found to be inappropriate, new parameters can be recalculated using on-orbit data and then re-uploaded via the satellite telemetry and control channel.

[0061] This invention also proposes a high-precision and high-reliability control method for on-board blackbodies, such as... Figure 2 As shown, it includes:

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

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

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

[0065] (4) The blackbody control unit determines whether there are new injection parameters. If so, it controls the on-board blackbody according to the new injection parameters; otherwise, it controls it according to the default parameters. The parameters include: the high-precision temperature control temperature T of the on-board blackbody. jk High-precision temperature control of onboard blackbody to temperature time T lg ;

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

[0067] (6) After receiving the “standby mode” command, the management and control unit starts the blackbody coarse 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 blackbody on the satellite;

[0069] The target temperature for coarse temperature control of the blackbody on the satellite is lower than the high-precision temperature T of the blackbody. jk The target temperature is the initial temperature T of the blackbody on the satellite. ck ;

[0070] DT =T jk -T ck

[0071] D T This refers to 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 is powered down by the blackbody control unit.

[0074] In standby mode, the temperature control unit, under continuous power, provides coarse temperature control of the blackbody with an accuracy of ±200 mK. In imaging mode, the blackbody control unit provides fine temperature control of the blackbody with an accuracy better than ±20 mK, and the temperature difference D... T The temperature rise time T for high-precision temperature control of the on-board blackbody is 0.5℃. lg Less than 10 minutes. Any content not described in detail in this specification is common knowledge to those skilled in the art.

Claims

1. A high-precision and fast on-board blackbody calibration control system, characterized in that It comprises: a management control unit, a temperature control unit, a blackbody control unit and a light machine main body, and the on-board blackbody is installed on the light machine main body; The on-board blackbody comprises a high-temperature blackbody and a low-temperature blackbody, and both the high-temperature blackbody and the low-temperature blackbody are provided with two groups of identical heating resistors as driving elements of the temperature control unit and the blackbody control unit; a group of thermistors and a group of platinum resistors are used for temperature measurement of the on-board blackbody, and are used as feedback elements of the temperature control unit and the blackbody control unit; The management control unit is long-term powered on for work, and is used for flow management and work scheduling of the whole control system; the temperature control unit is long-term powered on for work, and is used for temperature control of the light machine main body and provides an initial temperature for the on-board blackbody; the blackbody control unit is short-term powered on for work only in the imaging mode, and is used for high-precision temperature control of the on-board blackbody; In the standby mode, the temperature control unit is used for coarse temperature control of the on-board blackbody and maintaining the initial working temperature, and in the imaging mode, the blackbody control unit is powered on for fine temperature control of the on-board blackbody, and rapidly reaches the target temperature of the fine temperature control on the basis of the initial working temperature; The target temperature of the on-board blackbody coarse control is lower than the high-precision control temperature T of the blackbody jk The target temperature, i.e. the initial temperature T of the on-board blackbody ck ; D T = T jk - T ck D T is the temperature difference.

2. The high-precision and fast on-board blackbody calibration control system according to claim 1, characterized in that: The parameters of the on-board blackbody control include: the initial temperature T ck of the on-board blackbody jk , the high-precision temperature control temperature T lg of the on-board blackbody .

3. The high-precision and fast on-board blackbody calibration control system according to claim 2, characterized in that: The method for confirming the blackbody parameters on the satellite is: determining the initial temperature T of the blackbody on the satellite through the ground subsystem thermal vacuum test ck , the high-precision temperature control temperature T of the blackbody jk , the temperature difference D T , and the temperature control to warm time T of the high precision lg .

4. The high-precision and fast on-board blackbody calibration control system according to claim 2, 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 the standby mode to ensure the initial temperature of the on-board blackbody; the management control unit receives the imaging mode instruction of the satellite, and starts the high-precision blackbody temperature control process; the management control unit powers on the blackbody control unit; The blackbody control unit judges whether there is the latest injection parameter, and controls the on-board blackbody according to the latest injection parameter if there is, or controls the on-board blackbody according to the default parameter otherwise; the parameters include: high-precision temperature control temperature T of the on-board blackbody jk , high-precision temperature control temperature T of the on-board blackbody lg ; the management control unit informs the temperature control unit to stop the blackbody temperature control; after receiving the standby mode instruction, the management control unit starts the initial temperature control process of the blackbody; The management control unit informs 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 blackbody on the satellite. the management control unit informs the blackbody control unit to stop the blackbody temperature control; the management control unit powers off the blackbody control unit.

5. The on-board blackbody calibration control method implemented by the high-precision and rapid on-board blackbody calibration control system according to claim 1, characterized in that It comprises: (1) the on-board blackbody calibration control system is in the standby mode to ensure the initial temperature of the on-board blackbody; (2) the management control unit receives the imaging mode instruction of the satellite, and starts the high-precision blackbody fine temperature control process; (3) the management control unit powers on the blackbody control unit; (4) The blackbody control unit determines whether there is the latest injection parameter, and if so, controls the on-board blackbody according to the latest injection parameter, otherwise controls according to the default parameter; the parameters include: the high-precision temperature control temperature T of the on-board blackbody jk , the high-precision temperature control temperature T of the on-board blackbody to the temperature time T lg ; (5) the management control unit informs the temperature control unit to stop the blackbody temperature control; (6) after receiving the standby mode instruction, the management control unit starts the coarse temperature control process of the blackbody; (7) The management control unit informs the temperature control unit to start blackbody temperature control, and the control parameters include the initial temperature T ck of the blackbody, to ensure the initial temperature of the blackbody on the satellite. (8) the management control unit informs the blackbody control unit to stop the blackbody temperature control; (9) the management control unit powers off the blackbody control unit.

6. The on-board blackbody calibration control method of claim 5, wherein: In the standby mode, the temperature control unit is long-term powered on for work, and is used for coarse temperature control of the blackbody, and the control precision is ±200mK.

7. The on-board blackbody calibration control method of claim 6, wherein: In the imaging mode, the temperature control accuracy of the black body control unit for fine control of the temperature of the black body is better than ±20 mK, and the temperature difference D T is 0.5℃, and the high-precision temperature control of the on-board black body is completed in a temperature control time T lg of less than 10 minutes.

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