Ground Calibration System Design of High-Precision Star Sensor

2013 ◽  
Vol 694-697 ◽  
pp. 1068-1073
Author(s):  
Jie Duan ◽  
Zhi Yong An ◽  
Xiang Yang Sun
Keyword(s):  
High Precision ◽  
Optical Transmission ◽  
Angular Distance ◽  
Star Sensor ◽  
Optical Navigation ◽  
Calibration System ◽  
Large Size ◽  
High Magnitude ◽  
Design Plan ◽  
Ground Calibration

In order to meet the high precision calibration requirements of precision angular distance and high magnitude to the optical navigation sensor, A new style of high precision star simulator with large caliber, and long-focus, is presented. And then the main compositions of this simulator are designed in detail referring to the simulator, the steering mirror, the standard simulated targets and so on. According to the simulator characteristics of large size lens and multi lens, the structural of lens cone uses the tube sleeve and inner sleeves fixed together means. To eliminate the mirror deformation, the design plan based on the tiny stress is applied in steering mirror. In order to achieve a high magnitude, the light targets are simulated by optical transmission from OLED to high precision drone with fibers. Its degree ≤1〞,simulated magnitude≥5 that meet calibration requirements of the current high-precision optical navigation sensor.

scholarly journals First in-orbit results of the vector magnetic field measurement of the High Precision Magnetometer onboard the China Seismo-Electromagnetic Satellite

2019 ◽  
Vol 71 (1) ◽  
Author(s):  
Bin Zhou ◽  
Bingjun Cheng ◽  
Xiaochen Gou ◽  
Lei Li ◽  
Yiteng Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Precision ◽  
Magnetic Field Measurement ◽  
Vector Data ◽  
Magnetic Field Data ◽  
Night Side ◽  
The Difference ◽  
The Magnetic Field ◽  
Ground Calibration ◽  
Data Calibration

Abstract The High Precision Magnetometer (HPM) is one of the main payloads onboard the China Seismo-Electromagnetic Satellite (CSES). The HPM consists of two Fluxgate Magnetometers (FGM) and the Coupled Dark State Magnetometer (CDSM), and measures the magnetic field from DC to 15 Hz. The FGMs measure the vector components of the magnetic field; while the CDSM detects the magnitude of the magnetic field with higher accuracy, which can be used to calibrate the linear parameters of the FGM. In this paper, brief descriptions of measurement principles and performances of the HPM, ground, and in-orbit calibration results of the FGMs are presented, including the thermal drift and magnetic interferences from the satellite. The HPM in-orbit vector data calibration includes two steps: sensor non-linearity corrections based on on-ground calibration and fluxgate linear parameter calibration based on the CDSM measurements. The calibration results show a reasonably good stability of the linear parameters over time. The difference between the field magnitude calculated from the calibrated FGM components and the magnitude directly measured by the CDSM is just 0.5 nT (1σ) when the linear parameters are fitted separately for the day- and the night-side. Satellite disturbances have been analyzed including soft and hard remanence as well as magnetization of the magnetic torquer, radiation from the Tri-Band Beacon, and interferences from the rotation of the solar wing. A comparison shows consistency between the HPM and SWARM magnetic field data. Observation examples are introduced in the paper, which show that HPM data can be used to survey the global geomagnetic field and monitor the magnetic field disturbances in the ionosphere.

scholarly journals Results of radiation tests of a new generation high-precision star sensor and its components

2021 ◽  
Vol 18 (6) ◽  
pp. 127-137
Author(s):  
R.V. Bessonov ◽  
◽  
A.A. Kobeleva ◽  
S.A. Prokhorova ◽  
P.S. Smetanin ◽  
...  
Keyword(s):  
High Precision ◽  
Star Sensor ◽  
New Generation

High precision automatic measurement for alignment of camera and star-sensor in GF-2

2017 ◽  
Vol 25 (11) ◽  
pp. 2931-2938 ◽  
Author(s):  
孙刚 SUN Gang ◽  
杨再华 YANG Zai-hua ◽  
万毕乐 WAN Bi-le ◽  
张成立 ZHANG Cheng-li ◽  
代卫兵 DAI Wei-bing
Keyword(s):  
High Precision ◽  
Automatic Measurement ◽  
Star Sensor

High-precision smart calibration system for temperature sensors

2019 ◽  
Vol 297 ◽  
pp. 111561 ◽  
Author(s):  
Rongshan Wei ◽  
Kui Ouyang ◽  
Xiaotian Bao ◽  
Xiong Gao ◽  
Chuandong Chen
Keyword(s):  
High Precision ◽  
Temperature Sensors ◽  
Calibration System

The CHEOPS instrument on-ground calibration system

2015 ◽  
Author(s):  
F. P. Wildi ◽  
B. Chazelas ◽  
A. Deline ◽  
M. Sordet ◽  
M. Sarajlic
Keyword(s):  
Calibration System ◽  
Ground Calibration

The Research of Precision Detection System on Grade Rode Based on Image Processing Technology

2014 ◽  
Vol 556-562 ◽  
pp. 2591-2594
Author(s):  
Hui Feng Kang ◽  
Qian Qian Hou
Keyword(s):  
Image Processing ◽  
High Precision ◽  
Image Acquisition ◽  
Processing Technology ◽  
System Stability ◽  
Sensor System ◽  
Calibration System ◽  
Verification System ◽  
Image Processing Technology ◽  
Test Requirements

In this article, a level ruler Precision Verification System program of the mobile-camera image processing technology that is based on the camera mobile image processing technology is proposed, as a result of the research for the existing barcode type level ruler verification system and a high-precision grating sensor system hardware structure is also built. Secondly, we calculate the uncertainty of the system, and at last do the system stability test that the results show that the system achieves the test requirements. On the barcode type level existing ruler verification system research, proposed a camera mobile image processing technology based on the level ruler of precision calibration system, builds a detection sensor system with high precision grating, realizes automatic acquisition level ruler barcode image, method of application without barcode image with barcode image subtraction the preliminary processing of image acquisition, eliminate the influence of background light on the image acquisition, the uncertainty of the calibration system of the theoretical calculation and experimental verification, the results show that the system achieves the test requirements.

High-precision responsivity calibration system for terahertz detector

2018 ◽  
Vol 39 (5) ◽  
pp. 93-97
Author(s):  
Li Xue ◽  
Fang Bo ◽  
Deng Yuqiang ◽  
Li Jianmin ◽  
Qi Cenke ◽  
...  
Keyword(s):  
High Precision ◽  
Calibration System ◽  
Terahertz Detector

scholarly journals A Star Sensor On-Orbit Calibration Method Based on Singular Value Decomposition

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3301 ◽  
Author(s):  
Liang Wu ◽  
Qian Xu ◽  
Janne Heikkilä ◽  
Zijun Zhao ◽  
Liwei Liu ◽  
...  
Keyword(s):  
Singular Value Decomposition ◽  
Singular Values ◽  
Calibration Method ◽  
Angular Distance ◽  
Singular Value ◽  
Optical Parameters ◽  
Star Sensor ◽  
Calibration Methods ◽  
Value Decomposition ◽  
Svd Method

The navigation accuracy of a star sensor depends on the estimation accuracy of its optical parameters, and so, the parameters should be updated in real time to obtain the best performance. Current on-orbit calibration methods for star sensors mainly rely on the angular distance between stars, and few studies have been devoted to seeking new calibration references. In this paper, an on-orbit calibration method using singular values as the calibration reference is introduced and studied. Firstly, the camera model of the star sensor is presented. Then, on the basis of the invariance of the singular values under coordinate transformation, an on-orbit calibration method based on the singular-value decomposition (SVD) method is proposed. By means of observability analysis, an optimal model of the star combinations for calibration is explored. According to the physical interpretation of the singular-value decomposition of the star vector matrix, the singular-value selection for calibration is discussed. Finally, to demonstrate the performance of the SVD method, simulation calibrations are conducted by both the SVD method and the conventional angular distance-based method. The results show that the accuracy and convergence speed of both methods are similar; however, the computational cost of the SVD method is heavily reduced. Furthermore, a field experiment is conducted to verify the feasibility of the SVD method. Therefore, the SVD method performs well in the calibration of star sensors, and in particular, it is suitable for star sensors with limited computing resources.

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