阅读说明：本技术 一种火场检测敏感器的高可靠太阳保护方法 (High-reliability sun protection method for fire scene detection sensor ) 是由 刘洁 乌日娜 陈超 张涛 周剑敏 邓楼楼 王子寒 程莉 刘彤 杨晓龙 于 2021-08-30 设计创作，主要内容包括：本发明涉及一种火场检测敏感器的高可靠太阳保护方法,包括在太阳进入产品视场时,给产品火场检测敏感器发送进入太阳模式指令,使产品滤光组件调整到校正挡板(不透光),以消除太阳光对产品的影响,并在产品视场不见太阳时,使产品退出太阳保护模式,继续正常工作。该方法提高了敏感器的实用性,消除了太阳光对火场检测结果的影响,并且避免了太阳光直射对产品光学系统造成的损伤。(The invention relates to a highly reliable sun protection method for a fire scene detection sensor, which comprises the steps of sending a sun entering mode instruction to the product fire scene detection sensor when the sun enters a product view field, adjusting a product light filtering component to a correction baffle (opaque) to eliminate the influence of sunlight on a product, and enabling the product to exit a sun protection mode to continue to work normally when the product view field does not see the sun. The method improves the practicability of the sensor, eliminates the influence of sunlight on the fire scene detection result, and avoids the damage of direct sunlight on the optical system of the product.)

1. A high-reliability sun protection method for a fire scene detection sensor is characterized by comprising the following steps:

step 1, calculating the projection of a sun vector in a satellite body coordinate system according to satellite attitude and orbit informationWherein S is_bxFor the projection of the sun vector in the X-axis direction of the satellite body coordinate system, S_byIs the projection of the sun vector in the Y-axis direction of the satellite body coordinate system, S_bzThe projection of the sun vector in the Z-axis direction of the satellite body coordinate system is obtained;

step 2, according to fireThe installation matrix of the field detection sensor and the projection of the sun vector on the satellite body coordinate system are calculated, and the projection of the sun vector on the fire field detection sensor is calculatedWherein S is_firexIs the projection of the sun vector in the X-axis direction of the coordinate system of the fire scene detection sensor S_fireyIs the projection of the sun vector in the Y-axis direction of the fire scene detection sensor coordinate system S_firezThe projection of the sun vector in the Z-axis direction of the fire scene detection sensor coordinate system is obtained;

step 3, judging whether the absolute value of the inverse cosine of the projection of the sun vector on the Z axis of the fire scene detection sensor is smaller than the conical field angle LmtHalpha of the fire scene detection sensor_FireSunIf | acos (S)_firez) Less than LmtHalpha |_FireSunJudging that the sun is seen in the conical view field range of the fire scene detection sensor;

step 4, when the calculated field of view of the fire scene detection sensor continuously shows the sun in a plurality of control periods, the star-loaded computer automatically sends a command of 'switching to a sun protection mode' to the fire scene detection sensor continuously, and at the moment, the sensor rotates the light filtering component to the opaque correction baffle plate so as to protect the optical system of the sensor;

and 5, when the field of view of the fire scene detection sensor is changed from the sun being seen to the sun being not seen, the spaceborne computer automatically and continuously sends an instruction of 'exiting the sun protection mode' to the fire scene detection sensor, and at the moment, the sensor enters a normal imaging mode and continues to work normally.

2. The method for highly reliable sun protection for fire scene detection sensors according to claim 1, wherein in step 1, the projection of the sun vector in the satellite body coordinate systemWherein S is_IxIs the projection of the sun vector in the X-axis direction of the J2000 inertial coordinate system, S_IyIs the projection of the sun vector in the Y-axis direction of the J2000 inertial coordinate system, S_IzThe projection of the sun vector in the Z-axis direction of the J2000 inertial coordinate system; c_BOA direction cosine matrix from a satellite orbit coordinate system to a satellite body coordinate system; c_OIIs a direction cosine matrix from the J2000 inertial frame to the satellite orbital frame.

3. The method for highly reliable solar protection of fire scene detection sensors according to claim 1, wherein, in step 2,wherein S_firexIs the projection of the sun vector in the X-axis direction of the coordinate system of the fire scene detection sensor S_fireyIs the projection of the sun vector in the Y-axis direction of the fire scene detection sensor coordinate system S_firezIs the projection of the sun vector in the Z-axis direction of the fire scene detection sensor coordinate system, C_PBfireIs a direction cosine matrix from a satellite body coordinate system to a fire scene detection sensor coordinate system, wherein the + Z axis is the optical axis direction of the sensor.

4. The method for highly reliable solar protection of a fire scene detection sensor according to claim 1, wherein in step 3, the fire scene detection sensor has a conical field angle LmtHalpha_FireSunIs 0.139 (radian).

5. The method for highly reliable sun protection of a fire scene detection sensor according to claim 1, wherein in step 4, the product filter assembly comprises a motor, a turntable, various filters and a light-tight correction baffle plate on the turntable, the motor is connected with the speed reducer, the turntable is fixed on the output shaft of the speed reducer, the various filters and the correction baffle plate are arranged on the turntable around the rotation shaft of the turntable, and when the fire scene detection sensor is in the exit sun protection mode, the turntable is driven by the speed reducer to rotate so that the desired filters are positioned in the light path; when the fire scene detection sensor enters a 'shift-to-sun protection mode', the correction baffle rotates to a position below the window, and the light path is blocked.

Technical Field

The invention belongs to the field of spacecraft attitude and orbit control, and relates to a high-reliability sun protection method for a fire scene detection sensor.

Background

A carbon monitoring (CM-1 for short) satellite of a land ecosystem mainly has the tasks of completing forest three-dimensional measurement, inverting biomass, forest accumulation, forest carbon sink data and the like. The CM-1 satellite carries a fire scene detection sensor and is used for detecting surface fire and crown fire in forest fire, outputting characteristic information such as fire position and area, timely sending the characteristic information to the ground through a Beidou short message system, accessing an emergency information processing system on the ground and guiding emergency management departments such as ground forest fire control to timely handle the information. However, when sunlight enters the visual field of the fire scene detection sensor product, the detection result of the product on the fire scene is influenced, and the direct sunlight also damages the optical system of the product.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: aiming at the problems that the detection result of a product on a fire scene can be influenced when sunlight enters the field of view of the product of the fire scene detection sensor, and the optical system of the product can be damaged by direct sunlight, the high-reliability sun protection method of the fire scene detection sensor is provided, and can realize that the sensor correction baffle is automatically closed when the sunlight enters the field of view of the sensor, and the sensor automatically returns to a normal working state when the sunlight exits the field of view of the sensor.

The technical solution of the invention is as follows:

a highly reliable sun protection method for fire scene detection sensors, as shown in fig. 1, includes the following steps:

step 1, according to the satellite attitude and orbitTrack information, calculating the projection of the sun vector in the satellite body coordinate systemWherein S is_bxFor the projection of the sun vector in the X-axis direction of the satellite body coordinate system, S_byIs the projection of the sun vector in the Y-axis direction of the satellite body coordinate system, S_bzThe projection of the sun vector in the Z-axis direction of the satellite body coordinate system is obtained;

step 2, calculating the projection of the sun vector on the fire scene detection sensor according to the installation matrix of the fire scene detection sensor and the projection of the sun vector on the satellite body coordinate systemWherein S is_firexIs the projection of the sun vector in the X-axis direction of the coordinate system of the fire scene detection sensor S_fireyIs the projection of the sun vector in the Y-axis direction of the fire scene detection sensor coordinate system S_firezThe projection of the sun vector in the Z-axis direction of the fire scene detection sensor coordinate system is obtained;

step 3, judging whether the absolute value of the inverse cosine of the projection of the sun vector on the Z axis of the fire scene detection sensor is smaller than the conical field angle LmtHalpha of the fire scene detection sensor_FireSunIf | acos (S)_firez) Less than LmtHalpha |_FireSunJudging that the sun is seen in the conical view field range of the fire scene detection sensor;

step 4, when the calculated field of view of the fire scene detection sensor continuously sees the sun in a plurality of control periods, such as 16 control periods, the spaceborne computer automatically sends a command of 'switching to a sun protection mode' to the fire scene detection sensor continuously, and at the moment, the sensor rotates the light filtering component to a correction baffle (opaque) so as to protect an optical system of the sensor;

and 5, when the field of view of the fire scene detection sensor is changed from the sun being seen to the sun being not seen, the spaceborne computer automatically and continuously sends an instruction of 'exiting the sun protection mode' to the fire scene detection sensor, and at the moment, the sensor enters a normal imaging mode and continues to work normally.

Further, in step 1, theProjection of sun vector in satellite body coordinate systemWherein S is_IxIs the projection of the sun vector in the X-axis direction of the J2000 inertial coordinate system, S_IyIs the projection of the sun vector in the Y-axis direction of the J2000 inertial coordinate system, S_IzThe projection of the sun vector in the Z-axis direction of the J2000 inertial coordinate system; c_BOA direction cosine matrix from a satellite orbit coordinate system to a satellite body coordinate system; c_OIIs a direction cosine matrix from the J2000 inertial frame to the satellite orbital frame.

Further, in the step 2,wherein S_firexIs the projection of the sun vector in the X-axis direction of the coordinate system of the fire scene detection sensor S_fireyIs the projection of the sun vector in the Y-axis direction of the fire scene detection sensor coordinate system S_firezIs the projection of the sun vector in the Z-axis direction of the fire scene detection sensor coordinate system, C_PBfireIs a direction cosine matrix from a satellite body coordinate system to a fire scene detection sensor coordinate system, wherein the + Z axis is the optical axis direction of the sensor.

Further, in step 3, the conical field angle LmtHalpha of the fire scene detection sensor_FireSunIs 0.139 (radian).

Further, in step 4, as shown in fig. 2, the product filtering component includes a motor, a turntable, various filters and an opaque correction baffle on the turntable, the motor is connected with the speed reducer, the turntable is fixed to an output shaft of the speed reducer, the turntable is provided with various filters (such as different long-wave band infrared filters and medium-wave band infrared filters) and the correction baffle around a rotating shaft thereof, and when the fire scene detection sensor is in the "exit sun protection mode", the turntable is driven by the speed reducer to rotate so that the required filters are located in a light path; when the fire scene detection sensor enters a 'shift-to-sun protection mode', the correction baffle rotates to a position below the window, the light path is blocked, and the surface of the correction baffle is light-tight in a mode of spraying uniform black paint and the like, so that sunlight is prevented from directly irradiating the optical system.

The invention has the following technical effects:

the invention provides a high-reliability sun protection method for a fire scene detection sensor, which is characterized in that when the sun enters a product view field, a sun entering mode instruction is sent to a product, a product light filtering component is adjusted to a correction baffle (opaque), so that the influence of sunlight on the product is eliminated, and when the product view field does not see the sun, the product exits the sun protection mode and continues to work normally. The invention is suitable for sensor products which need to protect the field of view of sunlight.

Drawings

FIG. 1 is a flow chart of an implementation of a highly reliable sun protection method for a fire scene detection sensor according to the present invention;

fig. 2 is a schematic diagram of a product filter assembly.

Detailed Description

As shown in figure 1, the highly reliable sun protection method of the fire scene detection sensor provided by the invention takes LmtHalpha_FireSun0.139 (radians);

1)C_BO＝[0.99999615065240632,0.00070298161092801779,

0.0026841194505037858；-0.00070022267856767353,0.99999922575885769,-0.0010286738479627832；-0.0026848405111468366,0.0010267904069283546,0.99999586865791090]is a direction cosine matrix from the satellite orbit coordinate system to the satellite body coordinate system, C_OI＝[0.75235731415241092,-0.078468568763516891,-0.65406510039718191；0.21362291212489629,0.96828686724048818,0.12956000210280899；0.62315625910091699,-0.23719870666975873,0.74526039093564100]Is a direction cosine matrix from the J2000 inertial coordinate system to the satellite orbit coordinate system,projection of sun vector in satellite body coordinate system

2)C_PBfire＝[0,1,0；-1,0,0；0,0,1]The projection of the sun vector on the fire scene detection sensor is a direction cosine matrix from a fire alarm instrument coordinate system to a satellite mass center coordinate system

3)|arccos(S_firez) 2.247865425617000 (radian), the fire scene detection sensor does not see the sun;

4) judging whether the sun can be seen in the conical view field range of the fire scene detection sensor in real time, and when the calculated view field of the fire scene detection sensor can see the sun for 16 continuous control periods, namely | arccos (S)_firez)|<0.139 (radian), the star-loaded computer automatically sends three times of instructions of 'turning into sun protection mode' to the fire scene detection sensor continuously, and the sensor rotates the light filtering component to a correction baffle (opaque) to protect the sensor optical system;

5) when the field of view of the fire scene detection sensor is changed from the sun to the sun, the star-loaded computer automatically sends a command of 'exiting the sun protection mode' to the fire scene detection sensor for three times, and at the moment, the sensor enters a normal imaging mode and continues to work normally.

The invention is not described in detail and is within the knowledge of a person skilled in the art.