CubeSat centroid measurement method
A technology of cube satellite and measurement method, which is applied in the field of cube star, can solve the problems of increasing attitude control energy consumption, small size, regular shape of cube star, etc., and achieve the effect of low cost of measurement, high adaptability and easy operation
Active Publication Date: 2019-11-15
NANJING UNIV OF SCI & TECH
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Problems solved by technology
[0004] 1. The accuracy of satellite attitude is reduced, thereby reducing the quality of service;
[0005] 2. When the attitude control is active control, additional fluctuations increase the energy consumption of attitude control;
[0006] 3. When the attitude actuator adopts a flywheel mechanism, the fluctuation will cause the flywheel support to bear periodic dynamic loads, reducing the operating performance and life of the support;
[0007] 4. When the attitude control actuator is a jet thruster, the fluctuation will increase the number of thruster switches and opening time, and additionally increase the consumption of working fluid, thereby reducing the service life of the satellite
This method is often used to measure the center of mass of large satellites with non-uniform and irregular shapes, but cube stars have regular shapes and small dimensions, making it difficult to set suspension points, so this method cannot be used for centroid measurement
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[0034] A method for measuring the centroid of a CubeSat is specifically as follows:
[0035] (1) if figure 1 As shown, the flying direction of the CubeSat is the +x direction, the opposite direction of the flight is the -X direction, the CubeSat's direction to the sky is +z, and the direction to the ground is -z, and +y and -y are determined by the right-hand spiral law direction;
[0036] (2) if figure 2 As shown, on the surface opposite to the +y direction and the surface opposite to the -x direction on the outside of the main structure frame of the CubeSat, four holes surrounded by a rectangle are respectively set;
[0037] (3) Use four thimbles to support four holes on one of the faces;
[0038] (4) Set an electronic scale at the bottom of each thimble at the same time, and read the reading of the electronic scale;
[0039] (5) Let the position of the center of mass be (x 0 ,y 0 ,z 0 ), through such as image 3 The structural layout shown in the figure shows four ...
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The invention discloses a cubesat centroid measurement method. Firstly a rectangle support is arranged on four directions of each of a side surface and a bottom surface out of a main body framework of a cubesat, and electronic scales are arranged on a support bottom part to read the readings. Then a centroid deviation direction is judged by comparing the sum of the readings of the two electronic scales on the same side with the sum of the readings of the two electronic scales on the other side on the same surface. Finally a specific position of the centroid is determined according to a moment balance principle. The measurement method of the invention is easy to operate, required devices are extremely simple, and thus the measurement cost is low. The measurement method of the invention has high adaption, and is suitable for CubeSats of any unit.
Description
technical field [0001] The invention belongs to the technical field of cube satellites, in particular to a method for measuring the center of mass of a cube satellite. Background technique [0002] In recent years, with the rapid development of technologies such as communications, optoelectronic components, materials, sensors, and applied fluids, the development of CubeSat technology has accelerated significantly, and it has become possible to use CubeSats for remote measurement and testing. The low cost has prompted the emergence of cubesat development programs around the world. [0003] The center of mass of the satellite has a great influence on the attitude of the satellite. The deviation of the center of mass will cause the fluctuation of the attitude of the star. The fluctuation of the attitude of the star has several influences on the satellite: [0004] 1. The accuracy of satellite attitude is reduced, thereby reducing the quality of service; [0005] 2. When the a...
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IPC IPC(8): G01M1/12
CPCG01M1/12
Inventor 张翔李亮廖文和莫乾坤于永军郑侃张晓华刘幸川
Owner NANJING UNIV OF SCI & TECH