Multi-sensor redundant heterogeneous backup satellite payload scanning position measurement method and system

Abstract

The application provides a multi-sensor redundant heterogeneous backup satellite load scanning position measurement method and system, comprising the following steps: S1: position information of a load motor is measured by using an optical encoder, and when the position information obtained by the optical encoder does not meet a preset standard, position information of the load motor is measured by using an LVDT; S2: a speed value is obtained by differentiating position values; and S3: the position information and the speed value are taken as spectral scanning imaging measurement information and substituted into a control closed loop. The application adopts a redundant and heterogeneous backup design of multiple measurement methods, and greatly improves reliability. The application has an autonomous scheduling strategy, can reasonably switch measurement methods, and ensures effectiveness of load spectral scanning imaging. Two types of three displacement sensors are highly integrated and assembled on a linear guide rail, so that miniaturization and light weight of the whole mechanism are realized.

Description

Technical Field

[0001] This invention relates to the field of spacecraft design, and more specifically, to a method and system for measuring the scanning position of a multi-sensor redundant heterogeneous backup satellite payload. Background Technology

[0002] Spectral scanning imaging payloads are widely used in space observation satellite missions. To ensure imaging quality, increasingly higher requirements are placed on the scanning accuracy of the scanning device in the payload. The most important thing to ensure scanning accuracy is to improve the position measurement accuracy, while ensuring the high reliability of the measurement system. At the same time, the trend of miniaturization and lightweighting requires the system to be highly integrated.

[0003] The existing technologies are as follows:

[0004] The patent document "An Integrated Motor Photoelectric Encoder" (CN201820579095.0) improves production efficiency by optimizing the process, reducing the number of parts, and reducing production steps.

[0005] The patent document "An LVDT Displacement Sensor" (CN201721033374.9) designs a first guide rod and a second guide rod to enable the LVDT to have a low zero-point participation voltage and high accuracy.

[0006] The patent document "A Position Measurement Sensor and Position Measurement System" (CN201811073309.8) achieves non-contact, high real-time position measurement through a combination of PSD detector, laser, and semi-reflective beam splitter.

[0007] The patent document "A High Redundancy Measurement System for Motion Positioning of a Floating Installation Vessel" (CN201810993232.X) involves a main system, a backup system 1, and a backup system 2, and the systems can communicate wirelessly. The redundancy design can cope with emergencies and improve the system's measurement stability and reliability.

[0008] The patent document "A Photogrammetric Method for Camera Scanning Imaging" (CN201710248287.3) mainly relates to a photogrammetric method for camera scanning imaging, and describes the measurement steps, including the construction of a measurement platform, calibration to obtain positional relationship parameters, acquisition of the target center point angle information, and calculation of the three-dimensional coordinates of the spatial point.

[0009] Currently, there is no research on satellite payload scanning position measurement methods with multi-sensor redundancy and heterogeneous backup. Summary of the Invention

[0010] To address the shortcomings of existing technologies, the purpose of this invention is to provide a method and system for measuring the scanning position of multi-sensor redundant heterogeneous backup satellite payloads.

[0011] A method for measuring the scanning position of a multi-sensor redundant heterogeneous backup satellite payload according to the present invention includes:

[0012] Step S1: The position information of the load motor is obtained by measuring with a photoelectric encoder. When the position information obtained by the photoelectric encoder does not meet the preset standard, the position information of the load motor is obtained by measuring with an LVDT.

[0013] Step S2: Perform position value difference to obtain velocity value;

[0014] Step S3: Substitute the position information and velocity value as spectral scanning imaging measurement information into the control closed loop.

[0015] Preferably, in step S1:

[0016] The photoelectric encoder measurement method uses an incremental photoelectric encoder in conjunction with a grating ruler, and achieves position measurement through a subdivision circuit; the photoelectric encoder adopts a master-backup design and is equipped with mechanical limit, hard limit and soft limit;

[0017] The LVDT displacement sensor consists of a stator and a mover. The movement of the mover generates voltage changes, which reflect the magnitude of the displacement. The LVDT displacement sensor uses a preset point on the ground or a mechanical limit as an absolute zero point, and uses this as a reference to measure the position.

[0018] The measurement method employs a cold backup setup to achieve location measurement.

[0019] Preferably, in step S1:

[0020] Position information x is obtained by photoelectric encoder measurement; position information y is obtained by LVDT measurement;

[0021] Determine if x exceeds the preset limit;

[0022] If x does not exceed the preset limit, the status flag is set to 11, and x is used as location information;

[0023] If x exceeds the preset limit, set status flag 11 to AA, automatically switch the measurement reference, and determine whether y exceeds the preset limit. If y does not exceed the preset limit, use LVDT for position measurement.

[0024] The measurement reference priority is preset. By default, the photoelectric encoder priority is greater than the LVDT priority. If x exceeds the preset limit, the priority is switched to LVDT greater than the photoelectric encoder.

[0025] Preferably, in step S3:

[0026] The location information and the velocity value of the location information difference are used as the load spectral scanning imaging measurement information and substituted into the control closed loop to ensure uniform scanning at the preset speed and interval, thereby realizing full solar surface scanning imaging, half solar surface scanning imaging, and partial solar surface scanning imaging.

[0027] Preferably, a position measurement method based on different physical principles is adopted, employing photoelectric principle and pressure difference principle respectively, while ensuring adaptability to the space environment;

[0028] It adopts a multi-sensor redundant heterogeneous configuration of primary and backup photoelectric sensors and LVDT displacement sensors; an autonomous scheduling strategy is used to allocate measurement devices, and a flag is set for judgment and selection.

[0029] A multi-sensor redundant heterogeneous backup satellite payload scanning position measurement system provided by the present invention includes:

[0030] Module M1: The position information of the load motor is obtained by measuring the position information of the load motor using a photoelectric encoder. When the position information obtained by the photoelectric encoder does not meet the preset standard, the position information of the load motor is obtained by measuring the position information of the load motor using an LVDT.

[0031] Module M2: Performs position value difference to obtain velocity value;

[0032] Module M3: Inputs position information and velocity values ​​as spectral scanning imaging measurement information into the control closed loop.

[0033] Preferably, in module M1:

[0034] The photoelectric encoder measurement method uses an incremental photoelectric encoder in conjunction with a grating ruler, and achieves position measurement through a subdivision circuit; the photoelectric encoder adopts a master-backup design and is equipped with mechanical limit, hard limit and soft limit;

[0035] The LVDT displacement sensor consists of a stator and a mover. The movement of the mover generates voltage changes, which reflect the magnitude of the displacement. The LVDT displacement sensor uses a preset point on the ground or a mechanical limit as an absolute zero point, and uses this as a reference to measure the position.

[0036] The measurement method employs a cold backup setup to achieve location measurement.

[0037] Preferably, in module M1:

[0038] Position information x is obtained by photoelectric encoder measurement; position information y is obtained by LVDT measurement;

[0039] Determine if x exceeds the preset limit;

[0040] If x does not exceed the preset limit, the status flag is set to 11, and x is used as location information;

[0041] If x exceeds the preset limit, set status flag 11 to AA, automatically switch the measurement reference, and determine whether y exceeds the preset limit. If y does not exceed the preset limit, use LVDT for position measurement.

[0042] The measurement reference priority is preset. By default, the photoelectric encoder priority is greater than the LVDT priority. If x exceeds the preset limit, the priority is switched to LVDT greater than the photoelectric encoder.

[0043] Preferably, in module M3:

[0044] The location information and the velocity value of the location information difference are used as the load spectral scanning imaging measurement information and substituted into the control closed loop to ensure uniform scanning at the preset speed and interval, thereby realizing full solar surface scanning imaging, half solar surface scanning imaging, and partial solar surface scanning imaging.

[0045] Preferably, a position measurement method based on different physical principles is adopted, employing photoelectric principle and pressure difference principle respectively, while ensuring adaptability to the space environment;

[0046] It adopts a multi-sensor redundant heterogeneous configuration of primary and backup photoelectric sensors and LVDT displacement sensors; an autonomous scheduling strategy is used to allocate measurement devices, and a flag is set for judgment and selection.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] 1. All single measurement methods of this invention can achieve high-precision measurement;

[0049] 2. The invention features a redundant and heterogeneous backup design for multiple measurement methods, which significantly improves reliability;

[0050] 3. This invention has an autonomous scheduling strategy, which can reasonably switch measurement modes to ensure the effectiveness of load spectral scanning imaging;

[0051] 4. The present invention integrates three displacement sensors of two types onto a linear guide rail, thereby achieving miniaturization and weight reduction of the entire mechanism. Attached Figure Description

[0052] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0053] Figure 1 Diagram of a multi-sensor redundancy heterogeneous backup configuration scheme;

[0054] Figure 2 This is a schematic diagram of a photoelectric sensor solution.

[0055] Figure 3 LVDT displacement sensor schematic diagram;

[0056] Figure 4 A flowchart illustrating the logic judgment of the on-board autonomous scheduling strategy.

[0057] Figure 5 Use logic block diagrams for photoelectric sensors and LVDT displacement sensors. Detailed Implementation

[0058] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0059] Example 1:

[0060] This patent proposes a satellite payload scanning position measurement method with multi-sensor redundancy backup. It features a highly integrated configuration of a main backup photoelectric encoder and an LVDT displacement sensor, a multi-sensor heterogeneous design, and an onboard computer employing a scientific scheduling strategy to rationally utilize the sensors and provide effective identification, thereby achieving high-precision and high-reliability measurement of the payload scanning position.

[0061] This invention provides a satellite payload scanning position measurement method with multi-sensor redundancy backup, which includes the following features: Feature 1, using an optical encoder to achieve high-precision measurement of the payload motor scanning position; Feature 2, using an LVDT displacement sensor to achieve high-precision measurement of the payload motor scanning position; Feature 3, cold backup redundancy design of the optical encoder and LVDT displacement sensor to achieve highly reliable position measurement; Feature 4, using preset judgment logic on the satellite to switch the measurement reference according to a valid identifier; Feature 5, achieving high integration and assembly of multiple measurement devices under space constraints.

[0062] This invention addresses the position measurement of a satellite payload scanning mechanism. Measurement accuracy directly impacts scanning control and imaging quality. By employing a multi-sensor redundancy design, high-precision measurement is achieved through multiple channels. The photoelectric encoder measurement method utilizes a high-precision incremental photoelectric encoder in conjunction with a grating ruler. This encoder is small in size and highly accurate, and high-precision position measurement can be achieved through microstepping circuitry. The LVDT displacement sensor consists of a stator and a mover; the movement of the mover generates voltage changes, reflecting the magnitude of the displacement. This invention improves the reliability of the motion mechanism by combining multiple measurement methods. Furthermore, the onboard autonomous recall strategy ensures the camera operates normally throughout its lifespan. This invention can be effectively applied to similar high-precision, high-reliability, and highly integrated position measurement systems. The method presented in this invention is reasonable, feasible, and has strong engineering value.

[0063] A method for measuring the scanning position of a multi-sensor redundant heterogeneous backup satellite payload provided by the present invention, such as... Figures 1-5 As shown, it includes:

[0064] Step S1: The position information of the load motor is obtained by measuring with a photoelectric encoder. When the position information obtained by the photoelectric encoder does not meet the preset standard, the position information of the load motor is obtained by measuring with an LVDT.

[0065] Specifically, in step S1:

[0066] The photoelectric encoder measurement method uses an incremental photoelectric encoder in conjunction with a grating ruler, and achieves position measurement through a subdivision circuit; the photoelectric encoder adopts a master-backup design and is equipped with mechanical limit, hard limit and soft limit;

[0067] The LVDT displacement sensor consists of a stator and a mover. The movement of the mover generates voltage changes, which reflect the magnitude of the displacement. The LVDT displacement sensor uses a preset point on the ground or a mechanical limit as an absolute zero point, and uses this as a reference to measure the position.

[0068] The measurement method employs a cold backup setup to achieve location measurement.

[0069] Specifically, in step S1:

[0070] Position information x is obtained by photoelectric encoder measurement; position information y is obtained by LVDT measurement;

[0071] Determine if x exceeds the preset limit;

[0072] If x does not exceed the preset limit, the status flag is set to 11, and x is used as location information;

[0073] If x exceeds the preset limit, set status flag 11 to AA, automatically switch the measurement reference, and determine whether y exceeds the preset limit. If y does not exceed the preset limit, use LVDT for position measurement.

[0074] The measurement reference priority is preset. By default, the photoelectric encoder priority is greater than the LVDT priority. If x exceeds the preset limit, the priority is switched to LVDT greater than the photoelectric encoder.

[0075] Step S2: Perform position value difference to obtain velocity value;

[0076] Step S3: Substitute the position information and velocity value as spectral scanning imaging measurement information into the control closed loop.

[0077] Specifically, in step S3:

[0078] The location information and the velocity value of the location information difference are used as the load spectral scanning imaging measurement information and substituted into the control closed loop to ensure uniform scanning at the preset speed and interval, thereby realizing full solar surface scanning imaging, half solar surface scanning imaging, and partial solar surface scanning imaging.

[0079] Specifically, a position measurement method based on different physical principles is adopted, employing photoelectric principle and pressure difference principle respectively, while ensuring adaptability to the space environment;

[0080] It adopts a multi-sensor redundant heterogeneous configuration of primary and backup photoelectric sensors and LVDT displacement sensors; an autonomous scheduling strategy is used to allocate measurement devices, and a flag is set for judgment and selection.

[0081] Example 2:

[0082] Example 2 is a preferred embodiment of Example 1, and is used to illustrate the present invention in more detail.

[0083] The present invention also provides a multi-sensor redundant heterogeneous backup satellite payload scanning position measurement system. The multi-sensor redundant heterogeneous backup satellite payload scanning position measurement system can be implemented by executing the process steps of the multi-sensor redundant heterogeneous backup satellite payload scanning position measurement method. That is, those skilled in the art can understand the multi-sensor redundant heterogeneous backup satellite payload scanning position measurement method as a preferred embodiment of the multi-sensor redundant heterogeneous backup satellite payload scanning position measurement system.

[0084] A multi-sensor redundant heterogeneous backup satellite payload scanning position measurement system provided by the present invention includes:

[0085] Module M1: The position information of the load motor is obtained by measuring the position information of the load motor using a photoelectric encoder. When the position information obtained by the photoelectric encoder does not meet the preset standard, the position information of the load motor is obtained by measuring the position information of the load motor using an LVDT.

[0086] Specifically, in module M1:

[0087] The photoelectric encoder measurement method uses an incremental photoelectric encoder in conjunction with a grating ruler, and achieves position measurement through a subdivision circuit; the photoelectric encoder adopts a master-backup design and is equipped with mechanical limit, hard limit and soft limit;

[0088] The LVDT displacement sensor consists of a stator and a mover. The movement of the mover generates voltage changes, which reflect the magnitude of the displacement. The LVDT displacement sensor uses a preset point on the ground or a mechanical limit as an absolute zero point, and uses this as a reference to measure the position.

[0089] The measurement method employs a cold backup setup to achieve location measurement.

[0090] Specifically, in module M1:

[0091] Position information x is obtained by photoelectric encoder measurement; position information y is obtained by LVDT measurement;

[0092] Determine if x exceeds the preset limit;

[0093] If x does not exceed the preset limit, the status flag is set to 11, and x is used as location information;

[0094] If x exceeds the preset limit, set status flag 11 to AA, automatically switch the measurement reference, and determine whether y exceeds the preset limit. If y does not exceed the preset limit, use LVDT for position measurement.

[0095] The measurement reference priority is preset. By default, the photoelectric encoder priority is greater than the LVDT priority. If x exceeds the preset limit, the priority is switched to LVDT greater than the photoelectric encoder.

[0096] Module M2: Performs position value difference to obtain velocity value;

[0097] Module M3: Inputs position information and velocity values ​​as spectral scanning imaging measurement information into the control closed loop.

[0098] Specifically, in module M3:

[0099] The location information and the velocity value of the location information difference are used as the load spectral scanning imaging measurement information and substituted into the control closed loop to ensure uniform scanning at the preset speed and interval, thereby realizing full solar surface scanning imaging, half solar surface scanning imaging, and partial solar surface scanning imaging.

[0100] Specifically, a position measurement method based on different physical principles is adopted, employing photoelectric principle and pressure difference principle respectively, while ensuring adaptability to the space environment;

[0101] It adopts a multi-sensor redundant heterogeneous configuration of primary and backup photoelectric sensors and LVDT displacement sensors; an autonomous scheduling strategy is used to allocate measurement devices, and a flag is set for judgment and selection.

[0102] Example 3:

[0103] Example 3 is a preferred example of Example 1, and is used to illustrate the present invention in more detail.

[0104] This invention relates to the field of spacecraft design, specifically to a satellite payload scanning position measurement method with multi-sensor redundancy backup. This method improves the reliability of the motion mechanism and ensures the camera operates normally throughout its lifespan by combining multiple measurement methods. The photoelectric encoder master-backup design enables high-precision measurement of the satellite payload motor scanning position. The LVDT displacement sensor achieves high-precision scanning position measurement through frictionless, non-contact motion of the mover. The photoelectric encoder and LVDT displacement sensor are redundantly backed up in quantity and heterogeneously backed up in principle. Simultaneously, a logical judgment strategy is employed on the satellite to rationally call upon normal displacement sensors and provide valid identification, achieving high-precision, high-reliability scanning position measurement and providing input for the control loop. This invention can be effectively applied to similar high-precision, high-reliability, and highly integrated position measurement systems. Addressing the challenges of providing high-precision, high-reliability position measurement information for satellite payload spectral scanning imaging, this invention provides a multi-sensor redundancy heterogeneous backup method. Through rational configuration, effective autonomous selection, and high integration, it ultimately ensures the safe and reliable operation of the payload.

[0105] This invention provides a satellite payload scanning position measurement method with multi-sensor redundancy and heterogeneous backup, which includes the following features:

[0106] Feature 1: High-precision measurement of the load motor scanning position is achieved using a photoelectric encoder;

[0107] Feature 2: High-precision measurement of the load motor scanning position is achieved by using an LVDT displacement sensor;

[0108] Feature 3: Cold backup redundant heterogeneous design of photoelectric encoder and LVDT displacement sensor to achieve highly reliable position measurement;

[0109] Feature 4: The satellite employs a pre-defined judgment logic, which can switch measurement references based on valid identifiers;

[0110] Feature 5: Achieving highly integrated assembly of multiple measuring devices under space constraints.

[0111] The above features together enable high-precision and reliable position measurement. Specifically,

[0112] High-precision position measurement can be achieved by using feature one and feature five.

[0113] High-precision position measurement can be achieved by using feature 2 and feature 5.

[0114] In engineering, two measurement methods based on different principles are cleverly chosen, resulting in a heterogeneous design, namely feature five.

[0115] High-precision and high-reliability measurement of the load scanning position is achieved through Feature 1, Feature 2, Feature 4, and Feature 5.

[0116] In practical use, features three and five have already been physically implemented. For feature three, the photoelectric encoder and LVDT should be selected to have the same level of accuracy to ensure interchangeability in case of failure. Feature five adopts an integrated assembly to achieve miniaturization as much as possible.

[0117] When using,

[0118] Step 1: The photoelectric encoder measures and obtains the position information x;

[0119] Step 2: LVDT measurement obtains location information y;

[0120] Step 3: Determine if x exceeds the limit. If it is normal, use it. If it is abnormal (this step assumes an abnormality), set status flag 11 to AA. Through feature 4, automatically switch the measurement reference and determine if y exceeds the limit. If it is normal, use LVDT for position measurement.

[0121] Step 4: The measurement reference priority can be set. By default, the photoelectric encoder priority is greater than the LVDT priority. If x is abnormal, the priority will switch to LVDT being greater than the photoelectric encoder.

[0122] Step 5: Obtain the velocity value z by differentiating the position values;

[0123] Step 6: The position measurement value y and its differential velocity value z can be used as the spectral scanning imaging measurement information of the Xihe spacecraft's main payload and substituted into the control closed loop to ensure uniform scanning at a predetermined speed and interval, thereby achieving full solar surface scanning imaging, half solar surface scanning imaging, and partial solar surface scanning imaging.

[0124] Preferably, a photoelectric encoder is used to achieve high-precision measurement of the scanning position of the load motor. The photoelectric encoder adopts a main backup design and is equipped with mechanical limit, hard limit and soft limit.

[0125] Preferably, the LVDT displacement sensor can achieve high-precision measurement of the motor scanning position. The absolute zero point can be set based on a preset point on the ground or a mechanical limit, and the LVDT displacement sensor uses this as a reference to measure the position.

[0126] Preferably, a cold backup setup is used with a main backup photoelectric encoder and an LVDT, providing three measurement methods to achieve highly reliable position measurement.

[0127] Preferably, the onboard software has a pre-set fault contingency plan. When the measurement information is normal, the valid identifier is set to 11. When the measurement information is abnormal, the valid identifier is set to AA. At the same time, it can switch to other measurement paths in a logical order.

[0128] Preferably, under the premise of space constraints caused by the highly integrated load design, multiple measuring devices such as photoelectric encoders and LVDT displacement sensors are integrated and assembled.

[0129] Preferably, a position measurement method based on different physical principles is adopted, employing photoelectric principle and pressure difference principle respectively, while ensuring adaptability to the space environment.

[0130] Preferably, it is adapted to, but not limited to, load scanning position measurement. Through high-precision real-time measurement of the scanning position, it can also differentially calculate the motion speed and statistically count the position error exceeding the tolerance.

[0131] Preferably, the satellite payload scanning position measurement method with multi-sensor redundancy backup uses a primary backup photoelectric sensor and an LVDT displacement sensor to achieve high-precision position measurement;

[0132] Preferably, a multi-sensor redundant heterogeneous configuration achieves high reliability for load scanning;

[0133] Preferably, the on-board autonomous scheduling strategy enables the allocation of measurement devices and provides available identifiers for ground control to determine and select.

[0134] Preferably, the two types of three displacement sensors are integrated and mounted on the guide rail to achieve a common reference and miniaturization.

[0135] Example 4:

[0136] Example 4 is a preferred example of Example 1, which is used to illustrate the present invention in more detail.

[0137] like Figure 1 As shown, this invention ensures high reliability of the measurement system through a primary backup of the photoelectric sensor and a redundant heterogeneous backup design of the LVDT displacement sensor.

[0138] like Figure 2 As shown, 1 is the reading head and 2 is the grating ruler. The high-precision measurement of the load scanning position is achieved by using the photoelectric principle.

[0139] like Figure 3 As shown, 1 is the stator, 2 is the mover, and 3 is the connecting mechanism. High-precision measurement of the load scanning position is achieved by using non-contact, frictionless voltage differential feedback.

[0140] like Figure 4 As shown, it can achieve autonomous on-board scheduling, and use available markers to assist ground-based judgment. When a measurement device at a certain location malfunctions, it can promptly switch to a backup sensor to ensure the effectiveness of spectral scanning imaging.

[0141] like Figure 5 As shown in the diagram, configure a photoelectric sensor or LVDT sensor according to the illustrated process to achieve high-precision position measurement.

[0142] In summary, this invention provides a satellite payload scanning position measurement method with multi-sensor redundancy backup, which can achieve high-precision and high-reliability measurement of satellite payload scanning position under high integration, ensuring reliable operation of the payload.

[0143] Those skilled in the art will understand that, in addition to implementing the system, apparatus, and their modules provided by this invention in purely computer-readable program code, the same program can be implemented in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system, apparatus, and their modules provided by this invention can be considered a hardware component, and the modules included therein for implementing various programs can also be considered structures within the hardware component; alternatively, modules for implementing various functions can be considered both software programs implementing the method and structures within the hardware component.

[0144] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A method for measuring the scanning position of a multi-sensor redundant heterogeneous backup satellite payload, characterized in that, include: Step S1: The position information of the load motor is obtained by measuring with a photoelectric encoder. When the position information obtained by the photoelectric encoder does not meet the preset standard, the position information of the load motor is obtained by measuring with an LVDT. Step S2: Perform position value difference to obtain velocity value; Step S3: Substitute the position information and velocity value as spectral scanning imaging measurement information into the control closed loop.

2. The multi-sensor redundant heterogeneous backup satellite payload scanning position measurement method according to claim 1, characterized in that, In step S1: The photoelectric encoder measurement method uses an incremental photoelectric encoder in conjunction with a grating ruler, and achieves position measurement through a subdivision circuit; the photoelectric encoder adopts a master-backup design and is equipped with mechanical limit, hard limit and soft limit; The LVDT displacement sensor consists of a stator and a mover. The movement of the mover generates voltage changes, which reflect the magnitude of the displacement. The LVDT displacement sensor uses a preset point on the ground or a mechanical limit as an absolute zero point, and uses this as a reference to measure the position. The measurement method employs a cold backup setup to achieve location measurement.

3. The multi-sensor redundant heterogeneous backup satellite payload scanning position measurement method according to claim 1, characterized in that, In step S1: Position information x is obtained by photoelectric encoder measurement; position information y is obtained by LVDT measurement; Determine if x exceeds the preset limit; If x does not exceed the preset limit, the status flag is set to 11, and x is used as location information; If x exceeds the preset limit, set status flag 11 to AA, automatically switch the measurement reference, and determine whether y exceeds the preset limit. If y does not exceed the preset limit, use LVDT for position measurement. The measurement reference priority is preset. By default, the photoelectric encoder priority is greater than the LVDT priority. If x exceeds the preset limit, the priority is switched to LVDT being greater than the photoelectric encoder priority.

4. The multi-sensor redundant heterogeneous backup satellite payload scanning position measurement method according to claim 1, characterized in that, In step S3: The location information and the velocity value of the location information difference are used as the load spectral scanning imaging measurement information and substituted into the control closed loop to ensure uniform scanning at the preset speed and interval, thereby realizing full solar surface scanning imaging, half solar surface scanning imaging, and partial solar surface scanning imaging.

5. The multi-sensor redundant heterogeneous backup satellite payload scanning position measurement method according to claim 1, characterized in that: Differentiated position measurement methods based on physical principles are adopted, employing photoelectric and differential pressure principles respectively, while ensuring adaptability to the space environment; It adopts a multi-sensor redundant heterogeneous configuration of primary and backup photoelectric sensors and LVDT displacement sensors; The autonomous scheduling strategy enables the allocation of measuring devices and sets markers for judgment and selection.

6. A multi-sensor redundant heterogeneous backup satellite payload scanning position measurement system, characterized in that, include: Module M1: The position information of the load motor is obtained by measuring the position information of the load motor using a photoelectric encoder. When the position information obtained by the photoelectric encoder does not meet the preset standard, the position information of the load motor is obtained by measuring the position information of the load motor using an LVDT. Module M2: Performs position value difference to obtain velocity value; Module M3: Inputs position information and velocity values ​​as spectral scanning imaging measurement information into the control closed loop.

7. The multi-sensor redundant heterogeneous backup satellite payload scanning position measurement system according to claim 6, characterized in that, In module M1: The photoelectric encoder measurement method uses an incremental photoelectric encoder in conjunction with a grating ruler, and achieves position measurement through a subdivision circuit; the photoelectric encoder adopts a master-backup design and is equipped with mechanical limit, hard limit and soft limit; The LVDT displacement sensor consists of a stator and a mover. The movement of the mover generates voltage changes, which reflect the magnitude of the displacement. The LVDT displacement sensor uses a preset point on the ground or a mechanical limit as an absolute zero point, and uses this as a reference to measure the position. The measurement method employs a cold backup setup to achieve location measurement.

8. The multi-sensor redundant heterogeneous backup satellite payload scanning position measurement system according to claim 6, characterized in that, In module M1: Position information x is obtained by photoelectric encoder measurement; position information y is obtained by LVDT measurement; Determine if x exceeds the preset limit; If x does not exceed the preset limit, the status flag is set to 11, and x is used as location information; If x exceeds the preset limit, set status flag 11 to AA, automatically switch the measurement reference, and determine whether y exceeds the preset limit. If y does not exceed the preset limit, use LVDT for position measurement. The measurement reference priority is preset. By default, the photoelectric encoder priority is greater than the LVDT priority. If x exceeds the preset limit, the priority is switched to LVDT being greater than the photoelectric encoder priority.

9. The multi-sensor redundant heterogeneous backup satellite payload scanning position measurement system according to claim 6, characterized in that, In module M3: The location information and the velocity value of the location information difference are used as the load spectral scanning imaging measurement information and substituted into the control closed loop to ensure uniform scanning at the preset speed and interval, thereby realizing full solar surface scanning imaging, half solar surface scanning imaging, and partial solar surface scanning imaging.

10. The multi-sensor redundant heterogeneous backup satellite payload scanning position measurement system according to claim 6, characterized in that: Differentiated position measurement methods based on physical principles are adopted, employing photoelectric and differential pressure principles respectively, while ensuring adaptability to the space environment; It adopts a multi-sensor redundant heterogeneous configuration of primary and backup photoelectric sensors and LVDT displacement sensors; The autonomous scheduling strategy enables the allocation of measuring devices and sets markers for judgment and selection.

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