A Method for Testing the Magnetic Moment of a Satellite Carrying a Strong Magnetic Load

Abstract

The present invention discloses a method for testing the magnetic moment of a satellite carrying a strong magnetic load. By traversing and testing at different satellite altitudes, the position of the magnetic equatorial plane of the satellite's magnetic field perpendicular to the ground direction is determined; data analysis is carried out based on the altitude traversal results to determine the altitude for satellite magnetic moment testing; a magnetic test acquisition sensor is set according to the determined altitude for satellite magnetic moment testing; the total magnetic moment of the satellite under different mission working conditions is tested according to the determined altitude for satellite magnetic moment testing and the status of the acquisition sensor; through this method, the altitude position for selecting the magnetic moment test sensor of a satellite containing a strong magnetic load can be determined; through this method, the applicability of the satellite magnetic moment test method can be expanded, and the magnetic moment test accuracy of a satellite containing a strong magnetic load can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of spacecraft, and particularly relates to a method for testing the magnetic moment of a satellite carrying a strong magnetic load. Background Art

[0002] For low-Earth orbit satellites, a torque that affects the satellite's attitude will be generated under the action of the geomagnetic field. The magnetic torque received by an on-orbit satellite is proportional to the Earth's magnetic field strength and the total magnetic moment of the satellite. Therefore, in the Earth's magnetic field environment, in order to reduce the interference of the magnetic torque, during the design and development of the satellite, it is necessary to control the total magnetic moment of the satellite within a certain constraint range according to the satellite attitude control requirements. Through satellite magnetic moment testing experiments, ensure the accurate measurement of the total magnetic moment of the satellite and adopt compensation measures to make it meet the design requirements.

[0003] The existing satellite magnetic moment testing methods mainly use the magnetic field mapping method. By using a magnetic field sensor at a certain distance from the spacecraft, the magnetic field in the space around the spacecraft is measured, and a mathematical inversion is performed on the distributed magnetic field as a function of the rotation angle to obtain the magnetic moment of the satellite. Currently, the commonly used magnetic moment measurement methods for satellites include the magnetic dipole method (far-field method), spherical mapping method, and equatorial mapping method (near-field analysis method). See GB / T 32307 "Methods for Evaluating and Controlling the Magnetism of Spacecraft", GJB 7679 "Magnetic Design and Magnetic Test Methods for Spacecraft", QJ 20003 "Magnetic Detection Methods for Spacecraft", etc.

[0004] With the development of the space industry, the functions and components of satellites are becoming more and more complex. Some satellites are designed to include strong magnetic materials such as strong permanent magnets to achieve functions such as land resource exploration and meteorological observation. Moreover, the satellite has a large overall structure size, and the layout position of the strong magnetic load is far from the geometric center of the whole satellite. It is difficult to accurately measure its total magnetic moment by the current method.

[0005] According to the relevant standards of satellite magnetic tests, the current magnetic moment testing methods for conventional satellites mainly include the dipole method (far-field method), spherical mapping method, and equatorial mapping method (near-field analysis method):

[0006] 1) The dipole method (far-field method) requires a sufficiently large test distance and has low test accuracy. Generally, it determines the order of magnitude of the satellite's magnetic moment and is not recommended as an accurate measurement method for the residual magnetic moment of the satellite.

[0007] 2) The spherical mapping method is applicable to satellites that can be inverted and is not applicable to satellites with characteristics such as large structure size, heavy weight, and non-invertible.

[0008] 3) The equatorial mapping method (near-field analysis method) is the main method for testing the magnetic moment of relatively large-volume satellites. However, due to the requirement of the test method to select the geometric center of the satellite, it is difficult to guarantee the test accuracy for the vertical magnetic moment test of satellites with eccentric layout of strong magnetic loads and complex magnetic source distributions. Summary of the Invention

[0009] In view of this, the object of the present invention is to provide a method for testing the magnetic moment of a satellite carrying a strong magnetic load, which can determine the height position for selecting a magnetic moment test sensor of a satellite containing a strong magnetic load and improve the magnetic moment test accuracy of a satellite containing a strong magnetic load.

[0010] A method for testing the magnetic moment of a satellite carrying a strong magnetic load includes:

[0011] In the first step, the satellite height traversal test is carried out to determine the position of the magnetic equatorial plane of the magnetic field in the direction perpendicular to the ground of the satellite:

[0012] 1) Place the magnetic sensor at a position higher than the top of the satellite;

[0013] 2) Place the satellite outside the test area;

[0014] 3) Conduct background magnetic field tests for each magnetic sensor;

[0015] 4) After the background test of the magnetic sensor is completed, push the satellite into the test area;

[0016] 5) The magnetic sensor conducts a magnetic field test on the magnetic field affected by the satellite magnetic load;

[0017] 6) After the test is completed, push the satellite out of the test area;

[0018] 7) Test the background magnetic field and the magnetic field affected by the satellite magnetic load, and take the difference between the two, which is the net magnetic field generated by the satellite magnetic load;

[0019] 8) Move the magnetic sensor down along the height direction, and repeat steps 2) to 7) until the height of the sensor unit is adjusted to the bottom of the satellite;

[0020] In the second step, according to the results of the height traversal, data analysis is carried out:

[0021] If the magnetic induction intensity shows no change in positive and negative directions and the magnitude changes from increasing to decreasing, select the position with the maximum magnetic induction intensity test as the magnetic source as the satellite magnetic moment test height; if the magnetic induction intensity shows positive and negative changes, select the region where the magnetic induction intensity is zero as the satellite magnetic moment test height;

[0022] In the third step, according to the analysis results, determine the satellite magnetic moment test height and set the magnetic test acquisition sensor;

[0023] In the fourth step, according to the determined satellite magnetic moment test height and the status setting of the acquisition sensor, carry out the satellite total magnetic moment test under different mission conditions.

[0024] Preferably, during the magnetic field test, an environmental magnetic sensor is used for synchronous monitoring. If the environmental fluctuation is greater than the set threshold value, the current data result is invalid, and the test is carried out again when the test conditions meet the requirements.

[0025] Preferably, a sensor group is composed of a number of magnetosensors arranged at equal intervals and parallel to the satellite placement plane to measure the magnetic field.

[0026] Preferably, multiple sensor groups are arranged at equal intervals in height to form a sensor unit to measure the magnetic field.

[0027] Preferably, a group is composed of 4 three-component magnetosensors, and three groups form a sensor unit.

[0028] The present invention has the following beneficial effects:

[0029] The present invention provides a method for measuring the magnetic moment of a satellite carrying a strong magnetic load. By traversing and testing at different satellite heights, the position of the magnetic field equatorial plane perpendicular to the ground direction of the satellite is determined; data analysis is carried out based on the height traversal results to determine the height for measuring the satellite magnetic moment; magnetic test acquisition sensors are set according to the determined height for measuring the satellite magnetic moment; the total magnetic moment of the satellite under different mission conditions is measured according to the determined height for measuring the satellite magnetic moment and the state of the acquisition sensors; through this method, the height position for selecting the magnetic moment measurement sensors of the satellite containing a strong magnetic load can be determined; through this method, the applicability of the satellite magnetic moment measurement method can be expanded, and the measurement accuracy of the magnetic moment of the satellite containing a strong magnetic load can be improved. Description of the Drawings

[0030] Figure 1 It is a schematic diagram of the height traversal magnetic test layout of the present invention;

[0031] Figure 2 It is a flowchart of the method of the present invention. Detailed Embodiment

[0032] The following are specific embodiments in conjunction with the drawings to describe the present invention in detail.

[0033] The solution of the present invention is based on the equatorial mapping method (near-field analysis method). As Figure 1 shown, a sensor group is composed of a number of magnetosensors arranged at equal intervals and parallel to the satellite placement plane. Starting from above the satellite top, it moves downward along the direction perpendicular to the placement plane at each set step length until reaching the satellite bottom; at each reached height, each magnetosensor measures the magnetic induction intensity at the position.

[0034] To improve the test efficiency, the present invention uses multiple sensor groups arranged at equal intervals in height to form a sensor unit. Each time the entire sensor unit is moved along the height direction, the test can be completed in a shorter time. In this embodiment, a group is composed of 4 three-component sensors, and three groups form a unit, with an interval of 0.3 m between adjacent two groups. Among them, in the initial test state, the position of the middle group of sensors covers the satellite top and traverses the satellite bottom through height traversal tests.

[0035] Collect the magnetic induction intensity through height traversal testing. Based on the variation of the magnetic induction intensity with height, judge the change of the magnetic field direction and the position of the magnetic source. According to the determined position of the magnetic source, use magnetic moment testing to collect the sensor to align with the center position of the magnetic source or positions such as the reversal of the magnetic induction intensity direction, and conduct magnetic moment measurement through the equatorial mapping method, which can improve the testing accuracy compared with testing by aligning with the geometric center of the satellite.

[0036] As Figure 2 shown, a method for testing the magnetic moment of a satellite carrying a strong magnetic load according to the present invention comprises the following steps:

[0037] In the first step, conduct satellite height traversal testing to determine the position of the magnetic field equatorial plane in the direction perpendicular to the ground of the satellite.

[0038] 1) Place a group of sensors or a sensor unit at the initial test position and preheat for half an hour;

[0039] 2) Place the satellite outside the test area;

[0040] 3) Conduct background magnetic field testing for each magnetic sensor;

[0041] 4) After the background testing of the magnetic sensors is completed, push the satellite into the test area;

[0042] 5) The magnetic sensors conduct magnetic field testing on the magnetic field affected by the satellite magnetic load;

[0043] 6) After the testing is completed, push the satellite out of the test area;

[0044] 7) Process the collected data and give the test result of this step;

[0045] 8) During the test, the environmental magnetic sensors monitor synchronously. If the environmental fluctuation is greater than 3 nT, the data result of this time is invalid, and the test should be carried out again when the test conditions meet the requirements;

[0046] 9) According to the step size requirement, simultaneously adjust the height of the magnetic sensor group or the sensor unit, and repeat 2) - 9) until the height of the sensor unit is adjusted to the bottom of the satellite; test the background magnetic field and the magnetic field affected by the satellite magnetic load at each height, and take the difference between the two, which is the net magnetic field generated by the satellite magnetic load.

[0047] In the second step, based on the height traversal results, conduct data analysis. If the magnetic induction intensity shows no change in positive and negative directions and the magnitude changes from increasing to decreasing, select the position with the maximum magnetic induction intensity test as the magnetic source as the satellite magnetic moment test height. If the magnetic induction intensity shows positive and negative changes, select the area around zero magnetic induction intensity as the satellite magnetic moment test height.

[0048] In the third step, according to the analysis results, determine the satellite magnetic moment test height and set the magnetic test acquisition sensor.

[0049] Step 4: Perform the total magnetic moment test of the satellite under different mission conditions according to the determined satellite magnetic moment test altitude and the status setting of the acquisition sensor.

[0050] In summary, the above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for testing the magnetic moment of a satellite carrying a strong magnetic load, characterized in that, Including: The first step is the satellite altitude traversal test to determine the position of the magnetic equatorial plane in the direction perpendicular to the ground of the satellite: 1) Place the magnetic sensor at a position higher than the top of the satellite; 2) Place the satellite outside the test area; 3) Conduct background magnetic field tests on each magnetic sensor; 4) After the background magnetic field test is completed, push the satellite into the test area; 5) The magnetic sensor conducts a magnetic field test on the magnetic field affected by the satellite magnetic load; 6) After the test is completed, push the satellite out of the test area; 7) For the background magnetic field measured by the magnetic sensor and the magnetic field affected by the satellite magnetic load, calculate the difference between the two, which is the net magnetic field generated by the satellite magnetic load; 8) Move the magnetic sensor down along the height direction and repeat steps 2) - 7) until the height of the magnetic sensor unit is adjusted to the bottom of the satellite; The second step is to carry out data analysis based on the results of the altitude traversal: If the magnetic induction intensity of the net magnetic field generated by the satellite magnetic load shows no change in positive and negative directions and the magnitude decreases from increasing, then select the position with the maximum magnetic induction intensity test as the magnetic source as the satellite magnetic moment test altitude; If the magnetic induction intensity shows a positive and negative change phenomenon, then use the zero magnetic induction intensity region as the satellite magnetic moment test altitude; The third step is to determine the satellite magnetic moment test altitude according to the analysis results and set the magnetic test acquisition sensor; The fourth step is to carry out the satellite total magnetic moment test under different mission conditions according to the determined satellite magnetic moment test altitude and the status setting of the acquisition sensor.

2. The satellite magnetic moment testing method for carrying a strong magnetic load according to claim 1, characterized in that, During the magnetic field test, use an environmental magnetic sensor for synchronous monitoring. If the environmental fluctuation is greater than the set threshold, the data result of this time is invalid, and the test will be carried out again when the test conditions meet the requirements.

3. A method for testing the magnetic moment of a satellite carrying a strong magnetic load as described in claim 1, characterized in that, Use a group of magnetic sensors arranged at equal intervals and parallel to the satellite placement plane to test the magnetic field.

4. A method for testing the magnetic moment of a satellite carrying a strong magnetic load as described in claim 3, characterized in that, Use multiple sensor groups arranged at equal intervals in height to form a sensor unit to test the magnetic field.

5. A method for testing the magnetic moment of a satellite carrying a strong magnetic load as described in claim 4, characterized in that, Four three-component magnetic sensors form a group, and three groups form a sensor unit.

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