On-orbit real-time adjustable black body temperature control method and black body temperature control system

Abstract

The invention relates to the technical field of on-orbit black body temperature control, and particularly provides an on-orbit real-time adjustable black body temperature control method and system, and the method comprises the steps: setting a temperature overshoot threshold value, and obtaining a temperature control auxiliary temperature according to the expected temperature of a black body; the black body temperature is collected according to a fixed period, a temperature control mode is adjusted in stages, a full-power temperature control mode is adopted in the first stage, and the temperature difference between the real-time temperature and the expected temperature of the black body is reduced at the fastest rate; in the second stage, a fixed duty ratio is adopted for temperature control; in the third stage, the duty ratio of the temperature control signal is dynamically adjusted according to the temperature difference between the real-time temperature of the black body and the expected temperature, so that the real-time temperature of the black body gradually approaches the expected temperature of the black body, and the problems that the real-time temperature of the black body fluctuates greatly at the expected temperature point and the temperature is difficult to control stably due to the fact that the temperature overshoot amplitude is too large are solved. Through a staged fine temperature control strategy, temperature overshoot is effectively avoided, and rapid fine temperature control from coarse to fine is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of on-orbit blackbody temperature control, and in particular relates to an on-orbit real-time adjustable blackbody temperature control method and a blackbody temperature control system. Background Art

[0002] In the field of modern aerospace remote sensing technology, on-orbit calibration of infrared remote sensing cameras is an important link to ensure their measurement accuracy and data reliability. At present, in the on-orbit calibration process of infrared remote sensing cameras, a black body on board is used for temperature control. The accuracy of black body temperature control directly affects the accuracy of calibration and correction. The traditional black body temperature control method mainly maintains the black body temperature by continuously outputting a fixed power. However, the traditional black body temperature control method still has some shortcomings in practical applications, such as low temperature control accuracy, complex control process, and large amount of calculation, which makes it difficult to meet the needs of high-precision calibration.

[0003] The existing blackbody temperature control methods have shortcomings in temperature control accuracy, temperature overshoot control, calculation amount, and on-orbit real-time adjustability, which limit the accuracy and reliability of on-orbit calibration of infrared remote sensing cameras. Therefore, a new on-orbit real-time adjustable precise blackbody temperature control method is urgently needed to overcome the defects of the existing technology and meet the needs of modern aerospace remote sensing technology for high-precision blackbody temperature control. Summary of the invention

[0004] In view of this, the present invention aims to provide an on-orbit real-time adjustable blackbody temperature control method. From the perspective of practical engineering application, a three-stage interval temperature control strategy is adopted, combined with FPGA real-time processing. While reducing the amount of calculation, a coarse-to-fine staged temperature control strategy is used to achieve rapid and refined temperature control, solving the problems of insufficient accuracy, large temperature overshoot, slow response speed, etc. in the on-orbit blackbody temperature control process of the prior art.

[0005] To achieve the above object, the technical solution created by the present invention is implemented as follows: The present invention provides, on one hand, a blackbody temperature control method that is adjustable in real time on orbit, comprising: Setting the temperature overshoot threshold , the temperature control auxiliary temperature is calculated according to the expected temperature of the black body: ; in, is the expected temperature of the black body, that is, the target temperature that the black body is expected to eventually reach; It is the auxiliary temperature in the temperature control process; Get the initial temperature of the blackbody , calculate the temperature control target difference as: ; by Get the real-time temperature of the black body for the period, and adjust the temperature according to the real-time temperature of the black body The temperature control method is set in stages: exist In the range, , each cycle The temperature control signal is always at high level; exist In the range, , each cycle The duty cycle of the temperature control signal is , the high level output time of the temperature control signal is , the remaining time is low level; exist Within the interval, dynamically adjust each cycle The duty cycle of the temperature control signal is adjusted to make the real-time temperature of the blackbody close to the expected temperature of the blackbody.

[0006] Preferably, the temperature overshoot threshold The value of is 3.

[0007] Preferably, the cycle The value is 512ms.

[0008] Preferably, Each period within the interval The duty cycle of the temperature control signal is .

[0009] Preferably, Within the interval, each cycle The duty cycle of the temperature control signal is , the high level output time of the temperature control signal is , the remaining time is low level, so that the real-time temperature of the black body approaches the expected temperature of the black body.

[0010] Preferably, FPGA is used to set the temperature control mode in stages according to the real-time temperature of the black body.

[0011] Preferably, the temperature control method is heating to increase the temperature or cooling to reduce the temperature.

[0012] Preferably, a temperature sensor is used to obtain the real-time temperature of the black body, and the temperature sampling period of the temperature sensor is .

[0013] Another aspect of the invention provides a blackbody temperature control system, comprising: controlling the temperature of the blackbody using an on-orbit real-time adjustable blackbody temperature control method.

[0014] Compared with the prior art, the invention can achieve the following beneficial effects: The present invention effectively avoids temperature overshoot through a staged fine temperature control strategy, and realizes rapid and fine temperature control from coarse to fine. In the first stage, full-power temperature control is used to quickly narrow the temperature gap. In the second stage, the temperature change rate is reduced by fixed duty cycle control. In the third stage, the duty cycle is dynamically adjusted according to the real-time temperature difference, gradually approaching the target temperature, thereby ensuring that the blackbody temperature can be stabilized near the target point, achieving the purpose of high-precision temperature control, and with the help of auxiliary temperature and temperature overshoot threshold, frequent temperature fluctuations near the target point are avoided, ensuring the stability of the temperature control process.

[0015] In addition, the temperature control method of the present invention has a small amount of calculation and can be efficiently processed through FPGA. For resource-constrained environments such as on-orbit temperature control, the present invention does not require complex computing resources and a large amount of storage space, which can effectively reduce the hardware cost and complexity of the system and improve the reliability and maintainability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings: Figure 1 It is a flow chart of an on-orbit real-time adjustable blackbody temperature control method provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the invention clearer, the invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the invention and do not constitute a limitation to the invention. Similar components in different embodiments use associated similar component numbers. In the following embodiments, many detailed descriptions are to enable the invention to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other components, materials, and methods. In some cases, some operations related to the invention are not shown or described in the specification, in order to avoid the core part of the invention being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0018] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to form various implementation methods. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a necessary sequence, unless otherwise specified that a certain sequence must be followed.

[0019] In the description of the invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention, unless otherwise specified, the meaning of "multiple" is two or more.

[0020] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0021] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0022] See also Figure 1 In one embodiment of the present invention, a blackbody temperature control method that is adjustable in real time on orbit is provided. Through a staged temperature control strategy, temperature overshoot can be effectively avoided, temperature control stability is improved, and the accuracy of on-orbit calibration and correction of infrared remote sensing cameras is ensured. The blackbody temperature control method that is adjustable in real time on orbit of the embodiment of the present invention can be applied to infrared remote sensing satellites, space probes and other equipment that require precise blackbody temperature control in orbit. The blackbody temperature control method specifically includes: S1: First, determine the key parameters in the temperature control process, mainly including the expected temperature of the blackbody , Temperature overshoot threshold The blackbody temperature control method of the embodiment of the present invention is usually carried out in the environment of satellite service software or controller end. Therefore, in the process of setting the key temperature control parameters, the blackbody expected temperature is artificially set. , Temperature overshoot threshold And the duty cycle of the second stage temperature control signal Input into the satellite service software or controller. In the embodiment of the present invention, the desired temperature of the black body is set , 560H is the hexadecimal representation of the expected temperature of the black body. All subsequent temperature data in this article are expressed in decimal.

[0023] Setting the temperature overshoot threshold , temperature overshoot threshold It is an incremental value used to adjust the temperature target point that the temperature control finally reaches. By using the temperature overshoot characteristic, the real-time temperature of the black body during the temperature control process can rebound to the set black body expected temperature. and the expected temperature of a blackbody The auxiliary temperature during the temperature control process can be calculated for: .

[0024] in, is the temperature that the black body is expected to reach in the process of temperature control, and In the process of temperature control, the temperature of the black body can be stabilized at A nearby auxiliary value.

[0025] Temperature overshoot threshold and auxiliary temperature The design mainly utilizes the temperature overshoot characteristic. If the target in the temperature control process is directly set as , the temperature control system may exceed the target value too much due to overshoot, and then rebound, which will cause large temperature fluctuations near the target point, making it difficult to achieve stable temperature control. After that, the temperature control is stopped instantly, and the real-time temperature of the black body naturally drops slightly, resulting in the black body temperature never reaching the expected temperature. , and set the temperature control target to , the temperature overshoot characteristic can be cleverly utilized. When the real-time temperature of the black body reaches At the moment of temperature overshoot, the natural fall will cause the real-time temperature of the black body to rebound to close to This design allows the temperature control system to naturally return to the set blackbody desired temperature after the temperature overshoots, thereby achieving more stable and precise temperature control and preventing the real-time temperature from fluctuating around the desired temperature and failing to stabilize.

[0026] The temperature control goal is to make the real-time temperature of the black body gradually approach the set black body expected temperature by heating or cooling. The real-time temperature of the black body is measured by a sensor, and the sensor temperature measurement cycle is In the embodiment of the present invention, The value is 512ms, that is, the real-time temperature of the black body is obtained every 512ms, and the duty cycle of the temperature control signal is adjusted. The duty cycle of the temperature control signal reflects the time ratio of the high level and the low level. The high level indicates that the temperature control is in progress, and the low level indicates that the temperature control is not in progress. For example, during the heating process, the high level indicates that the heating is carried out during this period of time, and the low level indicates that the heating is not carried out. During this process, the temperature of the black body will naturally drop. Due to the temperature control detection cycle The time is short, so the temperature naturally drops very little, so it can be considered that the duty cycle of the temperature control signal is the power level of the temperature control. The system response speed and stability need to be considered comprehensively to set the cycle. Setting the width too short will cause the system to adjust frequently, increase the computing burden and possibly cause oscillation; setting the width too long will cause the system to respond slowly and affect the timeliness of temperature control.

[0027] S2: Before temperature control begins, obtain the initial temperature of the black body through the sensor In the embodiment of the present invention, the initial temperature of the black body is . According to the auxiliary temperature The initial temperature of the black body Calculate the temperature control target difference for: .

[0028] Temperature control target difference It directly reflects the degree of deviation between the current temperature and the target temperature and is the basis for subsequent adjustments to the temperature control strategy.

[0029] Calculate the temperature control target difference The half interval value of , half interval value The calculation formula is: .

[0030] In order to reduce the amount of temperature control calculation, When it is not divisible by 2, the half interval value can be determined by rounding down. .

[0031] S3: The real-time temperature of the black body is obtained periodically, and the temperature control mode is set in stages according to the real-time temperature of the black body. The temperature control target difference is divided into different intervals, and different temperature control strategies are adopted in different intervals to achieve gradual temperature control from coarse to fine. In the embodiment of the present invention, the temperature control target difference is divided into three temperature control stages according to the actual experimental results, specifically: The first temperature control stage is set to ,in .

[0032] The second temperature control stage is set to ,in .

[0033] The third temperature control stage is set to .

[0034] According to the three temperature control stages, three temperature control methods are designed: full power temperature control, fixed duty cycle temperature control and dynamic duty cycle temperature control. The details are as follows: The first temperature control stage: When the black body real-time temperature exist When the interval , full power temperature control mode is adopted, that is, in each cycle In the process, the output power temperature control signal OUT is always at high level 1. That is, in this stage, the black body is temperature controlled with the maximum heating or cooling capacity, so as to quickly raise or lower the temperature to the middle area of ​​the temperature control target difference, and quickly narrow the gap between the real-time temperature of the black body and the expected temperature of the black body.

[0035] The second temperature control stage: When the black body real-time temperature exist When the interval , using a fixed duty cycle Temperature control, in an embodiment of the present invention, The specific value of N can be adjusted according to the actual maximum power of temperature control and the temperature control target difference. By adjusting the duty cycle, this stage can be changed. However, after N is determined, the duty cycle is always used in the second temperature control stage. In each cycle The time when the output power temperature control signal OUT is high level 1 is , the remaining time is low level 0. That is, each cycle The front The power temperature control signal OUT is high level 1, from After The power temperature control signal is low level 0. In the second temperature control stage, the duty cycle is reduced to reduce the power output of heating or cooling, so that the temperature change rate is slowed down to avoid excessive temperature overshoot, while continuing to approach the target temperature. Under the premise of ensuring a certain temperature control speed, the temperature control accuracy is improved to avoid the black body real-time temperature approaching the auxiliary temperature, and the temperature is difficult to control and continues to rise rapidly, resulting in a large temperature overshoot.

[0036] The third temperature control stage: When the black body real-time temperature exist When the interval , using dynamic adjustment of each cycle The temperature is controlled by the duty cycle of the temperature control signal. , the duty cycle of the temperature control signal will change. The specific duty cycle is expressed as , that is, in each cycle Before ms output power temperature control signal OUT is high level 1, and the remaining time power temperature control signal power temperature control signal is low level 0. Continuously approaching the auxiliary temperature , each cycle The time of outputting high level 1 gradually becomes shorter, that is, the temperature control rate gradually decreases to avoid excessive temperature overshoot. Auxiliary temperature reached Moment, whole cycle Completely stop temperature control, so the real-time temperature of the black body There will be a natural small drop, according to the overshoot characteristics of the black body real-time temperature Will gradually rebound to the expected temperature of the black body , and always stable at The temperature is close to the target temperature gradually, achieving the purpose of precise temperature control. This avoids the problem of excessive temperature overshoot or temperature not being able to stabilize at the traditional method. Nearby problems.

[0037] In short, the above description is only a preferred embodiment of this specification and is not intended to limit the protection scope of this specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this specification shall be included in the protection scope of this specification.

[0038] The systems, devices, modules or units described in one or more of the above embodiments may be implemented by a computer chip or entity, or by a product having a certain function. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0039] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0040] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0041] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

Claims

1. An on-orbit real-time adjustable blackbody temperature control method, characterized in that: include: Setting the temperature overshoot threshold , the temperature control auxiliary temperature is calculated according to the expected temperature of the black body: ； in, is the expected temperature of the black body, that is, the target temperature that the black body is expected to eventually reach; It is the auxiliary temperature in the temperature control process; Get the initial temperature of the blackbody , calculate the temperature control target difference as: ； by Get the real-time temperature of the black body for the period, and adjust the temperature according to the real-time temperature of the black body The temperature control method is set in stages: exist In the range, , each cycle The temperature control signal is always at high level; exist In the range, , each cycle The duty cycle of the temperature control signal is , the high level output time of the temperature control signal is , the remaining time is low level; exist Within the interval, dynamically adjust each cycle The duty cycle of the temperature control signal is adjusted to make the real-time temperature of the blackbody close to the expected temperature of the blackbody.

2. The on-orbit real-time adjustable blackbody temperature control method according to claim 1, characterized in that: The temperature overshoot threshold The value of is 3.

3. The on-orbit real-time adjustable blackbody temperature control method according to claim 1, characterized in that: cycle The value is 512ms.

4. The on-orbit real-time adjustable blackbody temperature control method according to claim 1, characterized in that: exist Each period within the interval The duty cycle of the temperature control signal is .

5. The on-orbit real-time adjustable blackbody temperature control method according to claim 1, characterized in that: exist Within the interval, each cycle The duty cycle of the temperature control signal is , the high level output time of the temperature control signal is , the remaining time is low level, so that the real-time temperature of the black body approaches the expected temperature of the black body.

6. The on-orbit real-time adjustable blackbody temperature control method according to claim 1, characterized in that: FPGA is used to set the temperature control method in stages according to the real-time temperature of the blackbody.

7. The on-orbit real-time adjustable blackbody temperature control method according to claim 1, characterized in that: The temperature control method is heating to increase the temperature or cooling to reduce the temperature.

8. The on-orbit real-time adjustable blackbody temperature control method according to claim 1, characterized in that: The temperature sensor is used to obtain the real-time temperature of the black body. The temperature sampling period of the temperature sensor is .

9. A blackbody temperature control system, characterized in that: The temperature of the black body is controlled by using the on-orbit real-time adjustable black body temperature control method as described in any one of claims 1 to 8.

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